Specifications
| Item | Value |
|---|---|
| Material | Alloy steel 42CrMo (AISI 4140) quenched and tempered; carbon cast steel GS-45 / S355J2; 304 / 316L stainless for corrosion-exposed latch hardware |
| Process | Water glass lost wax investment casting for large parts; silica sol lost wax for compact coupler bodies |
| Dimensional tolerance | ISO 8062 CT6-CT8 (water glass); CT4-CT6 (silica sol); pin bores and latch faces machined to drawing tolerance |
| Surface finish | Ra 3.2-6.3 um as-cast on silica sol parts; Ra 6.3-12.5 um on water glass parts; Ra 1.6 um on machined pin bores and lock faces |
| Machining | CNC machining of pin bores, hook and latch seats, hydraulic cylinder lug faces, lock indicator window and bolt hole patterns |
| Weight range | 5-35 kg per coupler body |
| Inspection & certificates | EN 10204 3.1, CMM dimensional report, hardness test, 100 percent magnetic-particle inspection on load-bearing sections, optional ultrasonic testing, salt-spray testing per ISO 9227, PPAP/FAIR on request |
Key features
- One-piece cast coupler body replaces welded plate frames and removes the fatigue-prone weld at the hook throat.
- Pin bores, hook profile and latch seats are CNC machined so attachments seat without rattle or shimming.
- 42CrMo quench and temper delivers the impact toughness required by front loader and telehandler duty cycles.
- Water glass lost wax keeps tooling economical for large parts at 300-3,000 pieces per year.
- Wall thickness is modelled and verified by sectioning to remove shrinkage risk at the hook root.
- Supplied shot blasted and finished with primer, powder coat or wet paint in customer RAL colours.
Applications
- Compact and utility tractor front loaders.
- Telescopic handlers and telehandler attachment carriages.
- Skid steer and compact track loader attachment interfaces.
- Wheel loader and backhoe loader quick couplers.
- Municipal and industrial attachment fleets.
- Hydraulic or manual pin-lock coupler assemblies.
Quality and compliance
Ningbo Ruican produces loader quick-attach coupler bodies under an IATF 16949 and ISO 9001 certified quality system. Safety-relevant coupler bodies receive 100 percent magnetic-particle inspection on the hook, latch and pin boss sections, with ultrasonic testing added where the drawing calls for it. Every heat is documented on an EN 10204 3.1 certificate with full heat-lot traceability through quench and temper, machining and packing. Hardness is verified on each heat-treated batch, coating systems are qualified by ISO 9227 salt-spray testing, and PPAP or FAIR packages are prepared on request to support customer approval.
FAQs
Can this coupler body meet safety requirements for load handling?
We manufacture to your drawing and specification and support your approval process with material certificates, 100 percent magnetic-particle inspection on load-bearing sections and full dimensional reporting.
Why use investment casting instead of a welded plate frame?
Casting removes the weld at the hook throat, which is the usual fatigue crack origin in welded frames, and gives consistent wall sections and repeatable geometry across the production run.
Do you machine the pin bores and latch seats?
Yes. Pin bores, hook profile, latch seats and cylinder lug faces are CNC machined to the drawing so attachments fit directly on arrival.
What material do you recommend for telehandler duty?
42CrMo (AISI 4140) quenched and tempered is our standard recommendation for telehandler and high-cycle front loader couplers because of its impact toughness and fatigue strength.
Can you handle large coupler bodies?
Yes. Water glass lost wax covers large parts up to 35 kg, with silica sol used where tighter tolerance and finer surface finish are needed on compact bodies.
What finish do you supply?
Standard supply is shot blasted to Sa 2.5 with epoxy primer, powder coating or wet paint in your RAL colour, all validated by ISO 9227 salt-spray testing.
