[{"data":1,"prerenderedAt":872},["ShallowReactive",2],{"catalog:meta":3,"guides:page:\u002Finjection-molding-machine-parts\u002Fbarrel-screw\u002Fscrew:*":258,"guides:topics:barrel-screw:\u002Finjection-molding-machine-parts\u002Fbarrel-screw\u002Fscrew:path,title,short":638,"guides:page:\u002Finjection-molding-machine-parts\u002Fbarrel-screw:diagram":690,"diagram:id:injection-unit":691,"catalog:parts::MC-BC-02":864},{"categories":4,"machines":132,"zones":212,"totals":255},[5,35,59,122],{"id":6,"name":7,"slug":8,"description":9,"partCount":10,"subcategories":11},"EC","Electrical Components","electrical","Electrical systems and components for injection molding machines including heaters, thermocouples, servo motors, and controllers.",11,[12,17,22,27,31],{"id":13,"name":14,"slug":15,"partCount":16},"EC-CBC","Circuit Boards & Controllers","circuit-boards",4,{"id":18,"name":19,"slug":20,"partCount":21},"EC-CE","Connectors & Cables","connectors-cables",2,{"id":23,"name":24,"slug":25,"partCount":26},"EC-GEP","Servo Motors & Drives","servo-motors",1,{"id":28,"name":29,"slug":30,"partCount":21},"EC-HT","Heaters","heaters",{"id":32,"name":33,"slug":34,"partCount":21},"EC-SF","Safety Components","safety",{"id":36,"name":37,"slug":38,"description":39,"partCount":40,"subcategories":41},"HY","Hydraulic Components","hydraulic","Complete range of hydraulic system components including pumps, valves, motors, and pressure controls for injection molding machines.",14,[42,46,51,55],{"id":43,"name":44,"slug":45,"partCount":26},"HY-AU","Accumulators","accumulators",{"id":47,"name":48,"slug":49,"partCount":50},"HY-CV","Control Valves","control-valves",6,{"id":52,"name":53,"slug":54,"partCount":26},"HY-MO","Monitors & Gauges","monitors-gauges",{"id":56,"name":57,"slug":58,"partCount":50},"HY-PW","Pumps & Motors","pumps-motors",{"id":60,"name":61,"slug":62,"description":63,"partCount":64,"subcategories":65},"MC","Mechanical Components","mechanical","Mechanical parts and assemblies including barrels, screws, tie bars, bushings, platens, and clamping components.",42,[66,71,75,80,85,89,93,97,101,105,109,114,118],{"id":67,"name":68,"slug":69,"partCount":70},"MC-BC","Barrels & Cylinders","barrels-cylinders",5,{"id":72,"name":73,"slug":74,"partCount":16},"MC-SB","Screw Barrels & Seals","screws",{"id":76,"name":77,"slug":78,"partCount":79},"MC-TC","Tie Bars & Columns","tie-bars",7,{"id":81,"name":82,"slug":83,"partCount":84},"MC-GZ","Bushings & Guides","bushings-guides",8,{"id":86,"name":87,"slug":88,"partCount":26},"MC-PP","Platens","platens",{"id":90,"name":91,"slug":92,"partCount":70},"MC-TL","Toggle & Links","toggle-links",{"id":94,"name":95,"slug":96,"partCount":21},"MC-CC","Clamping Components","clamping",{"id":98,"name":99,"slug":100,"partCount":21},"MC-GMP","Tools & Accessories","tools-accessories",{"id":102,"name":103,"slug":104,"partCount":21},"MC-ES","End Caps & Plates","end-caps",{"id":106,"name":107,"slug":108,"partCount":26},"MC-SR","Seals & Rings","seals-rings",{"id":110,"name":111,"slug":112,"partCount":113},"MC-JM","Joints & Mounts","joints-mounts",3,{"id":115,"name":116,"slug":117,"partCount":26},"MC-SG","Safety Guards","safety-guards",{"id":119,"name":120,"slug":121,"partCount":26},"MC-CR","Clamping Mechanism","clamping-mechanism",{"id":123,"name":124,"slug":125,"description":126,"partCount":113,"subcategories":127},"O","Other Components","other","Additional components including filters, cooling systems, lubrication parts, and other auxiliary equipment.",[128],{"id":129,"name":130,"slug":131,"partCount":113},"O-TC","Filters & Cooling","filters-cooling",[133,143,161,172,180,188,194,200,205],{"id":134,"name":135,"slug":134,"series":136,"partCount":142},"haitian","Haitian International",[137,138,139,140,141],"Mars Series (MA)","Jupiter Series (JU)","Zhafir Venus Series (VE)","Zhafir Zeres Series (ZE)","Zhafir Jeres Series (JE)",68,{"id":144,"name":145,"slug":144,"series":146,"partCount":160},"yizumi","Yizumi",[147,148,149,150,151,152,153,154,155,156,157,158,159],"A6 Series","A5-EU Series","A5-N Series","SKIII Series","DP Series","D1 Series","FF Series","FF-M Series","P Series","CG-P Series","VM Series","SPET Series","LSR Series",12,{"id":162,"name":163,"slug":162,"series":164,"partCount":171},"chen-hsong","Chen Hsong",[165,166,167,168,169,170],"JETMASTER MK Series","JETMASTER SVP Series","SUPERMASTER Series","EASYMASTER Series","SPARK Series","JETMASTER C2 Series",10,{"id":173,"name":174,"slug":173,"series":175,"partCount":179},"tederic","Tederic",[176,177,178],"NEO Series","D Series (Two-Platen)","DE Series (All-Electric)",0,{"id":181,"name":182,"slug":181,"series":183,"partCount":179},"borch","Borch",[184,185,186,187],"BU Series (Two-Platen)","BS-III Series (Servo)","BE Series (All-Electric)","BM Series (Multi-color)",{"id":189,"name":190,"slug":189,"series":191,"partCount":179},"log-machine","LOG Machine",[192,193],"LOG-SE Series","LOG-EE Series (All-Electric)",{"id":195,"name":196,"slug":195,"series":197,"partCount":179},"donghua","Donghua",[198,199],"DH Series (Servo)","DH-TP Series (Two-Platen)",{"id":201,"name":202,"slug":201,"series":203,"partCount":179},"sunbun","Sunbun",[204],"Sunbun Servo Series",{"id":206,"name":207,"slug":206,"series":208,"partCount":179},"lijin","L.K. Machinery (Lijin)",[209,210,211],"POTENZA Series","FORZA Series (Two-Platen)","ELETTRICA Series (All-Electric)",[213,217,221,225,228,231,235,238,242,248,251],{"id":214,"number":26,"name":215,"role":216,"partCount":21},"clamp-cylinder","Clamping cylinder","The hydraulic cylinder behind the rear platen. It drives the crosshead that straightens the toggle links, which opens and closes the mold and builds the clamping force.",{"id":218,"number":21,"name":219,"role":220,"partCount":50},"toggle","Toggle mechanism","Links, pins and bushings between the rear and moving platens. They multiply the force of the clamping cylinder and lock the mold shut while plastic is injected.",{"id":222,"number":113,"name":223,"role":224,"partCount":113},"ejector","Ejector","A small cylinder behind the moving platen that pushes the ejector rods and plate forward to release the finished part from the mold.",{"id":78,"number":16,"name":226,"role":227,"partCount":40},"Tie bars & bushings","Four steel columns that join the platens, guide the moving platen and carry the clamping force. Tie bar nuts lock them in place; bushings guide the moving platen along them.",{"id":88,"number":70,"name":229,"role":230,"partCount":21},"Platens & mold plates","The fixed and moving platens carry the two halves of the mold; the rear platen anchors the toggle. Locating rings and clamping plates center and hold the mold.",{"id":232,"number":50,"name":233,"role":234,"partCount":50},"barrel-screw","Barrel, screw & nozzle","The screw turns inside the heated barrel to melt and mix the plastic, then moves forward to inject it through the nozzle into the mold. The screw tip and check ring stop melt from flowing back.",{"id":30,"number":79,"name":236,"role":237,"partCount":113},"Heater bands & sensors","Heater bands around the barrel and nozzle melt the plastic. Thermocouples measure each heating zone so the controller can hold the set temperature.",{"id":239,"number":84,"name":240,"role":241,"partCount":79},"injection-unit","Injection unit","Injection cylinders push the screw forward, the hydraulic (plasticizing) motor turns it, and the carriage moves the unit against the mold on its guide rails.",{"id":243,"number":244,"name":245,"role":246,"partCount":247},"hydraulics",9,"Hydraulic unit","The pump, motor, valves, accumulator, filters and oil cooler in the machine base. They supply and control the oil pressure for every movement of the machine.",16,{"id":8,"number":171,"name":249,"role":250,"partCount":244},"Electrical cabinet","The controller, I\u002FO and drive boards, servo drives, contactors and safety switches that run and protect the machine.",{"id":252,"number":10,"name":253,"role":254,"partCount":21},"feet","Machine feet","Leveling bolts and anti-vibration pads under the machine base that keep the machine level and stop vibration spreading to the floor.",{"parts":256,"subcategories":257},70,23,{"id":259,"title":260,"body":261,"description":610,"diagram":611,"extension":612,"faq":613,"item":626,"lastModified":627,"meta":628,"navigation":629,"order":26,"parts":630,"path":632,"seo":633,"seoTitle":634,"short":635,"stem":636,"__hash__":637},"guides\u002Finjection-molding-machine-parts\u002Fbarrel-screw\u002Fscrew.md","Injection molding screw: parts, zones and types",{"type":262,"value":263,"toc":597},"minimark",[264,268,277,282,285,333,337,340,345,348,352,355,359,362,377,381,459,472,476,479,496,499,531,535,558,566,570,590],[265,266,267],"p",{},"The injection molding screw is the flighted steel shaft that turns inside the heated barrel, melts the plastic and then pushes it into the mold. In every cycle it does two jobs: while it rotates, its flights carry pellets forward from the feed throat and melt them; when it moves forward without turning, it acts as a plunger and injects the melt. The screw's design, its three zones and the condition of its flights decide how evenly the plastic melts and how much of each shot reaches the mold.",[265,269,270,271,276],{},"The screw is item 4 in the drawing. For how it works with the barrel, the nozzle and the rest of the plasticizing unit, see the ",[272,273,275],"a",{"href":274},"\u002Finjection-molding-machine-parts\u002Fbarrel-screw\u002F","barrel and screw guide",".",[278,279,281],"h2",{"id":280},"screw-parts-names","Screw parts names",[265,283,284],{},"From the rear (drive end) to the front:",[286,287,288,296,306,316,322],"ul",{},[289,290,291,295],"li",{},[292,293,294],"strong",{},"Shank (drive end)."," The unflighted rear end that fits into the screw drive. It carries a spline or keys that take the torque from the plasticizing motor, and a groove or collar by which it is held in the drive coupling.",[289,297,298,301,302,305],{},[292,299,300],{},"Flight."," The helical ridge wound around the screw. Its outer surface, the ",[292,303,304],{},"flight land",", runs close to the barrel bore; the outside diameter of the flights is the screw's nominal diameter.",[289,307,308,311,312,315],{},[292,309,310],{},"Channel and root."," The channel is the space between the flights; its bottom is the ",[292,313,314],{},"root",". The channel depth is the flight diameter minus the root diameter, divided by two.",[289,317,318,321],{},[292,319,320],{},"Pitch (lead)."," The distance from one flight to the next along the screw. Many general-purpose screws have a pitch equal to the diameter, called a square pitch.",[289,323,324,327,328,332],{},[292,325,326],{},"Front end."," The thread that takes the ",[272,329,331],{"href":330},"\u002Finjection-molding-machine-parts\u002Fbarrel-screw\u002Fscrew-tip\u002F","screw tip",", and the face against which the seat ring of the check ring is clamped.",[278,334,336],{"id":335},"the-three-screw-zones","The three screw zones",[265,338,339],{},"The root diameter of the screw changes along its length, which divides it into three zones. The drawing marks them below the screw.",[341,342,344],"h3",{"id":343},"feed-zone","Feed zone",[265,346,347],{},"The rear zone, under the feed throat. Its channels are deep and of constant depth, so they can take in loose pellets and carry them forward as solids. The plastic starts to heat up here from the barrel wall. On a general-purpose screw the feed zone is usually the longest of the three.",[341,349,351],{"id":350},"compression-transition-zone","Compression (transition) zone",[265,353,354],{},"The root diameter increases, so the channel gets shallower. This compacts the pellets, squeezes the air between them back toward the hopper, and forces the plastic against the hot barrel wall. Most of the melting happens here, from the heat of the barrel and the shear of the turning screw.",[341,356,358],{"id":357},"metering-zone","Metering zone",[265,360,361],{},"The front zone, with shallow channels of constant depth. It finishes melting, evens out the temperature, and delivers a uniform melt to the space in front of the screw tip.",[265,363,364,365,368,369,372,373,276],{},"The ratio between the feed and metering channel depths is the ",[292,366,367],{},"compression ratio",", and the flighted length divided by the diameter is the ",[292,370,371],{},"L\u002FD ratio",". Both are explained in ",[272,374,376],{"href":375},"\u002Finjection-molding-machine-parts\u002Fbarrel-screw\u002Fl-d-ratio\u002F","L\u002FD ratio and compression ratio",[278,378,380],{"id":379},"screw-types-and-screw-design","Screw types and screw design",[382,383,384,400],"table",{},[385,386,387],"thead",{},[388,389,390,394,397],"tr",{},[391,392,393],"th",{},"Screw type",[391,395,396],{},"What is different",[391,398,399],{},"Typical use",[401,402,403,415,426,437,448],"tbody",{},[388,404,405,409,412],{},[406,407,408],"td",{},"General-purpose",[406,410,411],{},"Single flight, feed, compression and metering zones",[406,413,414],{},"Most unfilled and lightly filled plastics",[388,416,417,420,423],{},[406,418,419],{},"Material-specific",[406,421,422],{},"Zone lengths and compression chosen for one material, such as a gentle, gradual compression for heat-sensitive plastics or a short compression zone for materials that melt over a narrow range",[406,424,425],{},"Rigid PVC, nylon and other demanding materials",[388,427,428,431,434],{},[406,429,430],{},"Barrier screw",[406,432,433],{},"A second flight separates melted plastic from unmelted pellets",[406,435,436],{},"Higher outputs and more even melting",[388,438,439,442,445],{},[406,440,441],{},"Screw with mixing section",[406,443,444],{},"Fluted, pin or ring mixing elements near the front",[406,446,447],{},"Color and additive mixing",[388,449,450,453,456],{},[406,451,452],{},"Vented (two-stage) screw",[406,454,455],{},"A decompression section under a vent in the barrel lets moisture and gases escape",[406,457,458],{},"Materials that release volatiles, used with a vented barrel",[265,460,461,462,466,467,471],{},"Screws are also chosen for their surface. Nitrided alloy steel suits most plastics; screws for glass-filled, mineral-filled or corrosive materials have hard-faced flights, coatings or tool-steel construction. The ",[272,463,465],{"href":464},"\u002Fparts\u002Fmc-bc-02\u002F","injection screws"," we supply are made in a standard nitrided version and a bimetallic version; see ",[272,468,470],{"href":469},"\u002Finjection-molding-machine-parts\u002Fbarrel-screw\u002Fbimetallic-barrel\u002F","bimetallic barrels"," for how bimetallic screws differ.",[278,473,475],{"id":474},"signs-of-screw-wear-and-their-causes","Signs of screw wear and their causes",[265,477,478],{},"Symptoms that point to the screw:",[286,480,481,484,487,490,493],{},[289,482,483],{},"Screw recovery takes longer at the same screw speed and back pressure.",[289,485,486],{},"Shot weight and cushion vary even after the check ring has been replaced.",[289,488,489],{},"More black specks, streaks and slower color changes.",[289,491,492],{},"Unmelted pellets in parts at outputs the machine used to handle.",[289,494,495],{},"Visible scoring, polished bands or chipped edges on the flights when the screw is pulled.",[265,497,498],{},"The usual causes:",[286,500,501,507,513,519,525],{},[289,502,503,506],{},[292,504,505],{},"Abrasion"," from glass fiber, minerals and some pigments, which wears the flight lands and opens the clearance to the barrel.",[289,508,509,512],{},[292,510,511],{},"Corrosion"," from plastics or additives that release corrosive gases when they overheat.",[289,514,515,518],{},[292,516,517],{},"Adhesive wear (galling)"," when steel rubs on steel: a bent screw, a misaligned barrel or running the screw with an empty barrel.",[289,520,521,524],{},[292,522,523],{},"Overload"," from turning the screw on plastic that is not fully melted, which can twist the screw or break the tip.",[289,526,527,530],{},[292,528,529],{},"Foreign metal"," in the material, which scores the flights. A hopper magnet catches loose iron and steel.",[278,532,534],{"id":533},"inspecting-and-measuring-an-injection-molding-screw","Inspecting and measuring an injection molding screw",[536,537,538,546,549,552,555],"ol",{},[289,539,540,541,545],{},"Pull the screw while the barrel is hot (see ",[272,542,544],{"href":543},"\u002Finjection-molding-machine-parts\u002Fbarrel-screw\u002Fremoving-the-screw\u002F","how to remove the screw",") and lay it on supports along its length.",[289,547,548],{},"Clean it while it is still warm, with brass brushes and scrapers that will not mark the flights.",[289,550,551],{},"Look for scoring, pitting, cracks at the root of the flights, wear on the drive spline or keys, and damage to the tip thread.",[289,553,554],{},"Check straightness by rolling the screw on V-blocks with a dial indicator.",[289,556,557],{},"Measure the flight diameter with a micrometer at intervals along each zone and compare it with the nominal size and with the barrel bore.",[265,559,560,561,565],{},"Our guide to ",[272,562,564],{"href":563},"\u002Fblog\u002Fmeasuring-barrel-screw-wear-injection-molding\u002F","measuring barrel and screw wear"," explains how to interpret the readings. A screw with worn flights can sometimes be rebuilt by hard-facing and regrinding; a bent or cracked screw should be replaced.",[278,567,569],{"id":568},"what-to-send-for-a-replacement-screw","What to send for a replacement screw",[536,571,572,575,578,581,584,587],{},[289,573,574],{},"The machine brand and model, and the injection unit size or screw code if you know it.",[289,576,577],{},"The screw diameter and the plastics you run, including fillers.",[289,579,580],{},"The overall length, the flighted length and the lengths of the three zones (or the number of flights in each).",[289,582,583],{},"The root diameters in the feed and metering zones, and the pitch.",[289,585,586],{},"The drive end: spline or key, with its dimensions, and the tip thread size and hand.",[289,588,589],{},"Photos of the whole screw and both ends, and the OEM part number or a drawing if you have one.",[265,591,592,596],{},[272,593,595],{"href":594},"\u002Frequest-quote\u002F","Request a quote"," with these details. If the barrel is worn too, quote the screw and barrel as an assembly.",{"title":598,"searchDepth":21,"depth":21,"links":599},"",[600,601,606,607,608,609],{"id":280,"depth":21,"text":281},{"id":335,"depth":21,"text":336,"children":602},[603,604,605],{"id":343,"depth":113,"text":344},{"id":350,"depth":113,"text":351},{"id":357,"depth":113,"text":358},{"id":379,"depth":21,"text":380},{"id":474,"depth":21,"text":475},{"id":533,"depth":21,"text":534},{"id":568,"depth":21,"text":569},"What the screw of an injection molding machine does, the names of its parts, its feed, compression and metering zones, common screw types and signs of wear.",null,"md",[614,617,620,623],{"question":615,"answer":616},"What are the three zones of an injection molding screw?","The feed zone at the rear has deep flights that take in pellets from the hopper. In the compression (transition) zone the flights get shallower, which compresses and melts the plastic. The metering zone at the front has shallow flights that deliver an even, fully melted shot.",{"question":618,"answer":619},"What is the difference between a general-purpose screw and a barrier screw?","A general-purpose screw has a single flight with three zones and suits most plastics. A barrier screw adds a second flight in the melting section that separates the melted plastic from the unmelted pellets, which gives more even melting at higher outputs.",{"question":621,"answer":622},"Can a worn injection screw be repaired?","Often, yes. Worn flights can be rebuilt by hard-facing and regrinding them to size, if the screw is straight and its root and drive end are sound. Whether it is worth it depends on the screw size, the damage and the condition of the barrel.",{"question":624,"answer":625},"Why is the screw tip separate from the screw?","The screw tip and the check ring wear faster than the screw and are cheaper to replace. Making them separate parts lets you replace the non-return valve without replacing the whole screw.","screw","2026-10-31",{},true,[631],"MC-BC-02","\u002Finjection-molding-machine-parts\u002Fbarrel-screw\u002Fscrew",{"title":260,"description":610},"Injection Molding Screw: Parts, Zones and Screw Types","Screw","injection-molding-machine-parts\u002Fbarrel-screw\u002Fscrew","ViIQeAUKnGrtlbciEP5HmdMWmrbwNoDIdQVGwkej9mI",[639,643,647,651,655,659,663,667,671,675,678,682,686],{"path":640,"title":641,"short":642},"\u002Finjection-molding-machine-parts\u002Fbarrel-screw\u002Fbarrel","Injection molding machine barrel: construction, zones and wear","Barrel",{"path":644,"title":645,"short":646},"\u002Finjection-molding-machine-parts\u002Fbarrel-screw\u002Fcheck-ring","Check ring (non-return valve) of an injection molding screw","Check ring",{"path":648,"title":649,"short":650},"\u002Finjection-molding-machine-parts\u002Fbarrel-screw\u002Fscrew-tip","Screw tip of an injection molding machine: types and removal","Screw tip",{"path":652,"title":653,"short":654},"\u002Finjection-molding-machine-parts\u002Fbarrel-screw\u002Fnozzle","Injection molding machine nozzle: tip, size and design","Nozzle",{"path":656,"title":657,"short":658},"\u002Finjection-molding-machine-parts\u002Fbarrel-screw\u002Fshut-off-nozzle","Shut-off nozzle for injection molding: types and uses","Shut-off nozzle",{"path":660,"title":661,"short":662},"\u002Finjection-molding-machine-parts\u002Fbarrel-screw\u002Fnozzle-filter","Injection molding nozzle filter: types, use and cleaning","Nozzle filter",{"path":664,"title":665,"short":666},"\u002Finjection-molding-machine-parts\u002Fbarrel-screw\u002Fbarrel-head","Barrel head (front flange) of an injection molding machine","Barrel head",{"path":668,"title":669,"short":670},"\u002Finjection-molding-machine-parts\u002Fbarrel-screw\u002Fhopper-and-feed-throat","Hopper and feed throat of an injection molding machine","Hopper and feed throat",{"path":672,"title":673,"short":674},"\u002Finjection-molding-machine-parts\u002Fbarrel-screw\u002Fbimetallic-barrel","Bimetallic barrel and screw for injection molding machines","Bimetallic barrel",{"path":676,"title":677,"short":371},"\u002Finjection-molding-machine-parts\u002Fbarrel-screw\u002Fl-d-ratio","Screw L\u002FD ratio and compression ratio in injection molding",{"path":679,"title":680,"short":681},"\u002Finjection-molding-machine-parts\u002Fbarrel-screw\u002Fback-pressure","Back pressure in injection molding: what it does and how to set it","Back pressure",{"path":683,"title":684,"short":685},"\u002Finjection-molding-machine-parts\u002Fbarrel-screw\u002Fshot-size","Shot size calculation for injection molding machines","Shot size calculation",{"path":687,"title":688,"short":689},"\u002Finjection-molding-machine-parts\u002Fbarrel-screw\u002Fremoving-the-screw","How to remove the screw from an injection molding machine","Removing the screw",{"diagram":239},{"diagram":692},{"title":693,"description":694,"base":695,"labels":706,"items":717},"Parts of the injection unit","Section through an injection unit: nozzle, barrel front flange, barrel, screw with its feed, compression and metering zones, screw tip and check ring, heater bands, hopper throat and injection cylinder, numbered.",{"solid":696,"line":698},[697],"M470 118h14v104h-14z",[699,700,701,702,703,704,705],"M484 124L520 124","M484 216L520 216","M142 212L466 212","M142 207L142 217","M240 207L240 217","M340 207L340 217","M466 207L466 217",[707,711,714],{"x":708,"y":709,"text":710},191,228,"METERING",{"x":712,"y":709,"text":713},290,"COMPRESSION",{"x":715,"y":709,"text":716},403,"FEED",[718,733,750,765,794,807,831,844],{"id":719,"name":654,"role":720,"parts":721,"marker":723,"shapes":727},"nozzle","Screws into the front of the barrel and seals against the mold’s sprue bushing. The melt passes through it on every shot.",[722],"MC-BC-07",[724,725,724,726],52,24,156,{"solid":728,"hidden":731},[729,730],"M32 166L50 158L50 182L32 174Z","M52 156h36a2 2 0 0 1 2 2v24a2 2 0 0 1 -2 2h-36a2 2 0 0 1 -2 -2v-24a2 2 0 0 1 2 -2z",[732],"M34 170L88 170",{"id":734,"name":735,"role":736,"parts":737,"marker":739,"shapes":742},"front-flange","Barrel front flange","Also called the front head or end cap. It closes the front of the barrel and holds the nozzle.",[738],"MC-BC-08",[740,725,740,741],98,144,{"solid":743,"line":745,"hidden":748},[744],"M90 144h16a2 2 0 0 1 2 2v48a2 2 0 0 1 -2 2h-16a2 2 0 0 1 -2 -2v-48a2 2 0 0 1 2 -2z",[746,747],"M95.5 151a2.5 2.5 0 1 0 5 0a2.5 2.5 0 1 0 -5 0z","M95.5 189a2.5 2.5 0 1 0 5 0a2.5 2.5 0 1 0 -5 0z",[749],"M90 170L108 170",{"id":751,"name":642,"role":752,"parts":753,"marker":756,"shapes":759},"barrel","Thick steel tube the screw turns in. Bimetallic barrels have a hard alloy lining that resists wear from glass-filled and abrasive plastics.",[754,755],"MC-BC-01","MC-SB-01",[757,725,757,758],188,146,{"solid":760,"line":762},[761],"M108 146h362v48h-362z",[763,764],"M108 156L470 156","M108 184L470 184",{"id":626,"name":635,"role":766,"parts":767,"marker":768,"shapes":773},"Melts and meters the plastic. Its flights are deep in the feed zone, get shallower through the compression zone and stay shallow in the metering zone.",[631],[769,770,771,772],230,336,232,178,{"solid":774,"line":777},[775,776],"M142 162L240 162L340 166L486 166L486 174L340 174L240 178L142 178Z","M488 162h30a2 2 0 0 1 2 2v12a2 2 0 0 1 -2 2h-30a2 2 0 0 1 -2 -2v-12a2 2 0 0 1 2 -2z",[778,779,780,781,782,783,784,785,786,787,788,789,790,791,792,793],"M148 157L156 183","M168 157L176 183","M188 157L196 183","M208 157L216 183","M228 157L236 183","M248 157L256 183","M268 157L276 183","M288 157L296 183","M308 157L316 183","M328 157L336 183","M348 157L356 183","M368 157L376 183","M388 157L396 183","M408 157L416 183","M428 157L436 183","M448 157L456 183",{"id":795,"name":796,"role":797,"marker":798,"shapes":802},"screw-tip","Screw tip and check ring","A non-return valve on the front of the screw. The ring lets melt pass while the screw turns and seals when it injects, so the shot does not flow back.",[799,770,800,801],122,128,183,{"solid":803},[804,805,806],"M110 170L122 163L132 163L132 177L122 177Z","M125 157h8a1 1 0 0 1 1 1v24a1 1 0 0 1 -1 1h-8a1 1 0 0 1 -1 -1v-24a1 1 0 0 1 1 -1z","M134 159h8v22h-8z",{"id":808,"name":809,"role":810,"subcategory":28,"marker":811,"shapes":815},"heater-bands","Heater bands","Bands around the barrel and nozzle that heat the plastic to its processing temperature, each zone controlled by its own thermocouple.",[812,725,813,814],330,313,138,{"solid":816},[817,818,819,820,821,822,823,824,825,826,827,828,829,830],"M152 138h22a2 2 0 0 1 2 2v4a2 2 0 0 1 -2 2h-22a2 2 0 0 1 -2 -2v-4a2 2 0 0 1 2 -2z","M152 194h22a2 2 0 0 1 2 2v4a2 2 0 0 1 -2 2h-22a2 2 0 0 1 -2 -2v-4a2 2 0 0 1 2 -2z","M202 138h22a2 2 0 0 1 2 2v4a2 2 0 0 1 -2 2h-22a2 2 0 0 1 -2 -2v-4a2 2 0 0 1 2 -2z","M202 194h22a2 2 0 0 1 2 2v4a2 2 0 0 1 -2 2h-22a2 2 0 0 1 -2 -2v-4a2 2 0 0 1 2 -2z","M252 138h22a2 2 0 0 1 2 2v4a2 2 0 0 1 -2 2h-22a2 2 0 0 1 -2 -2v-4a2 2 0 0 1 2 -2z","M252 194h22a2 2 0 0 1 2 2v4a2 2 0 0 1 -2 2h-22a2 2 0 0 1 -2 -2v-4a2 2 0 0 1 2 -2z","M302 138h22a2 2 0 0 1 2 2v4a2 2 0 0 1 -2 2h-22a2 2 0 0 1 -2 -2v-4a2 2 0 0 1 2 -2z","M302 194h22a2 2 0 0 1 2 2v4a2 2 0 0 1 -2 2h-22a2 2 0 0 1 -2 -2v-4a2 2 0 0 1 2 -2z","M352 138h22a2 2 0 0 1 2 2v4a2 2 0 0 1 -2 2h-22a2 2 0 0 1 -2 -2v-4a2 2 0 0 1 2 -2z","M352 194h22a2 2 0 0 1 2 2v4a2 2 0 0 1 -2 2h-22a2 2 0 0 1 -2 -2v-4a2 2 0 0 1 2 -2z","M402 138h22a2 2 0 0 1 2 2v4a2 2 0 0 1 -2 2h-22a2 2 0 0 1 -2 -2v-4a2 2 0 0 1 2 -2z","M402 194h22a2 2 0 0 1 2 2v4a2 2 0 0 1 -2 2h-22a2 2 0 0 1 -2 -2v-4a2 2 0 0 1 2 -2z","M58 150h20a2 2 0 0 1 2 2v2a2 2 0 0 1 -2 2h-20a2 2 0 0 1 -2 -2v-2a2 2 0 0 1 2 -2z","M58 184h20a2 2 0 0 1 2 2v2a2 2 0 0 1 -2 2h-20a2 2 0 0 1 -2 -2v-2a2 2 0 0 1 2 -2z",{"id":832,"name":670,"role":833,"marker":834,"shapes":837},"feed-throat","Pellets drop from the hopper through the feed throat into the screw. The throat is usually water-cooled so the pellets do not melt and stick before the screw.",[835,725,835,836],446,62,{"solid":838,"hidden":841},[839,840],"M410 62L482 62L462 110L430 110Z","M434 110h24v36h-24z",[842,843],"M434 146L434 156","M458 146L458 156",{"id":845,"name":846,"role":847,"parts":848,"subcategory":72,"marker":850,"shapes":854},"injection-cylinder","Injection cylinder","Hydraulic cylinder that drives the screw forward to inject and holds pressure while the part sets. Its seals are wear parts.",[849],"MC-BC-06",[851,725,852,853],556,560,132,{"solid":855,"hidden":861},[856,857,858,859,860],"M520 128h8v84h-8z","M528 132h62v76h-62z","M590 128h8v84h-8z","M540 124h10v8h-10z","M570 124h10v8h-10z",[862,863],"M548 136h10v68h-10z","M528 170L548 170",[865],{"partNumber":631,"name":866,"subcategory":67,"subcategoryName":68,"shortDescription":867,"image":868,"inStock":629,"zone":232,"compatibleMachines":869},"Injection Screw","Replacement injection screw for injection molding machine plasticizing unit.","\u002Fpart-images\u002FMC\u002FMC-BC-01\u002FMC-BC-02\u002Ffront.jpg",[870,871],"Haitian MA Series","Haitian MA II Series",1793548980794]