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Extruder Couplings
Screw-to-gearbox couplings, spline adapters and torque limiters — new manufacture and refurbishment
We manufacture couplings, coupling sleeves, spline adapters and torque limiters for extruders and the pelletizer heads attached to them. Every coupling is machined to original fit, spline data and torque rating, in alloy steel, heat treated and — where the original called for it — nitrided or case hardened on the tooth flanks.
What We Supply
Screw-to-gearbox couplings — splined coupling sleeves, quill shafts and adapter shafts joining the gearbox output to the screw shaft, in matched pairs for twin-screw machines.
Spline adapters and sleeves — internal and external involute splines cut to original module, pressure angle, tooth count and fit class, with the engagement length and backlash of the original.
Torque limiters and shear couplings — shear-pin, shear-sleeve and friction-type overload devices, set to your release torque.
Motor-to-gearbox couplings — flexible disc, diaphragm, gear, grid and elastomeric couplings, with spacer sections to suit the installed gap.
Shrink discs and locking assemblies — keyless locking elements, clamping sets and hydraulic shrink fits for shaft-to-hub connections.
Cutter and auxiliary drive couplings — couplings and adapters for the pelletizer cutter drive, side feeders, side stuffers and vent stuffers.
Coupling wear parts — elastomer elements, grids, disc packs, bolt and dowel kits, shear pins, seals and lubrication fittings.
Extruder and Pelletizer Platform Coverage
We manufacture and supply new and replacement couplings, coupling sleeves, spline adapters and torque limiters for all extruder and pelletizer platforms in service today, including — but not limited to — the machines below.
| Manufacturer | Extruder and pelletizer models and families |
|---|---|
| JSW — The Japan Steel Works | CMP251, CMP274, CMP308, CMP335, CMP362, CMP387, CMP443; CIM360, CIM400, CIM460, CIM510, CIM560 |
| Kobelco | LCM, KTX and TSR families; LCM-H, LCM-EX, LCM-G, Hyper KTX, NEX-T, Mixtrumat and NCM legacy families |
| Coperion | ZSK MEGAcompounder family, including ZSK 380 and ZSK 420 |
| ENTEK | HT 162 |
| Farrel Pomini | FCM and FMP systems, including FMP100 |
| KraussMaffei | KE, ZE-PC and ZE BluePower families |
| Leistritz | ZSE 260 MAXX |
| Pelletizing systems | Nordson BKG, including Type AH D drive and rotor parts; Gala, Maag and equivalent underwater, water-ring and strand pelletizing systems |
| All other makes | Couplings and spline adapters for single-screw, co-rotating and counter-rotating twin-screw extruders and their pelletizing systems, of any manufacturer, model or age |
Platforms not listed are equally within scope, including obsolete and out-of-production equipment reproduced by reverse engineering. The extruder manufacturer and model are sufficient to open a project.
JSW Extruder Platforms
Our extruder program is built around JSW equipment. We hold established manufacturing experience across the CMP and CIM platforms: gearbox output and screw shaft spline systems, coupling sleeve geometry and engagement length, torque ratings and overload settings, fit classes and hardness specifications, and the wear mechanisms that limit coupling life on these machines.
The following components are supplied for the JSW CMP251, CMP274, CMP308, CMP335, CMP362, CMP387 and CMP443, and for the CIM360, CIM400, CIM460, CIM510 and CIM560:
| Component | Supply |
|---|---|
| Screw-to-gearbox coupling sleeves | New manufacture and refurbishment |
| Quill and adapter shafts | New manufacture and refurbishment |
| Spline adapters and sleeves | New manufacture |
| Torque limiters and shear couplings | New manufacture and reset to release torque |
| Cutter and auxiliary drive couplings | New manufacture |
| Coupling wear parts and bolt kits | New manufacture and replacement |
Couplings are supplied individually, as a matched pair with the screw shafts, or within a wider extruder and pelletizer package covering shafts, screws and screw elements, barrels, die plates, pelletizer knives, mechanical seals and bearing bushes — including Nordson BKG Type AH D drive and rotor parts — with interface dimensions coordinated across the assembly.
Materials
| Application | Materials and treatment |
|---|---|
| Coupling sleeves, quill and adapter shafts | 42CrMo4 (4140), 34CrNiMo6 (4340) and equivalent alloy steels, through hardened and tempered; dynamically balanced where required |
| Spline flanks | Gas- or plasma-nitrided, or case hardened, to original hardness and case depth |
| Torque limiters and shear elements | Alloy steel bodies with calibrated shear pins and sleeves; friction elements set to release torque |
| Wear parts | Elastomer elements, spring-steel grids and stainless disc packs to original stiffness and rating |
Where the original material was under-specified for the torque and duty, the coupling is supplied in an upgraded alloy or surface treatment.
Refurbishment
In most cases the splines and fits can be restored to original tooth thickness and backlash and returned to service at a fraction of the cost of a new coupling set.
- Incoming inspection — spline tooth thickness, backlash, wear pattern and fretting; bore, keyway and register fit; run-out, straightness and balance; fastener, dowel and shear element condition; hardness check and crack detection.
- Condition report — measured spline and fit wear against the service limit, remaining life and a clear recommendation: rebuild, replace or run on.
- Cleaning — polymer, grease and fretting-debris removal, lubrication passage cleaning, inspection of seals and retaining features.
- Rebuild — worn spline flanks weld overlaid and re-cut to original tooth thickness and fit class; bores re-sleeved and re-machined; keyways, registers, threads and dowel holes repaired; bent quill and adapter shafts straightened and stress relieved.
- Surface treatment and upgrade — re-nitriding, case hardening or coating as required, with an upgrade in alloy or surface treatment where the original was under-specified.
- Final inspection and matching — spline gauging, run-out and hardness verification, dynamic balancing, and trial assembly with the mating shaft before shipment.
A coupling rebuilt to correct spline fit protects the gearbox; one left to run transfers its wear straight into the output shaft.
Reverse Engineering
We hold the technical information needed to produce couplings for the platforms above. Where a coupling is obsolete, undocumented or from an out-of-production machine, we reverse engineer it from a sample coupling or from the mating gearbox output and screw shaft: spline module or diametral pitch, pressure angle, tooth count, tooth thickness and fit class, major and minor diameters, engagement length, bore, keyway, bolt circle, torque rating, material and hardness. The resulting manufacturing drawing package becomes the permanent record for repeat supply.