The ram eye bracket is the load-transfer node between a tipper hydraulic cylinder and the dumper body or subframe. It takes the full thrust of the tipping ram, plus side loading when the body twists on uneven ground, and it is the part that fails first when a fabricated eye is undersized. Ningbo Ruican casts and finish-machines the bracket to your print, with a radiused eye root and controlled grain flow that spread the load and stop crack initiation at the weld throat.
Specifications
| Item | Specification |
|---|---|
| Casting process | Silica sol lost-wax investment casting, near-net eye and fork profile |
| Material options | Low-alloy steel 42CrMo / AISI 4140, carbon steel 45, cast steel GS-20Mn5, ductile iron 600-3 |
| Dimensional tolerance (ISO 8062-3 CT grade) | CT5-CT6 as-cast, CT4 on machined pin bore and mounting faces |
| Machining | Horizontal machining centre and CNC lathe; pin bore, fork faces and bolt pattern finish machined |
| Surface finish (Ra) | Ra 3.2 um as-cast, Ra 1.6 um on machined faces, Ra 0.8 um on pin bore |
| Weight range | 3.5 kg – 14.0 kg per bracket |
| Typical lead time | Tooling 25-35 days, samples 15 days after tooling, production 30-40 days |
Key features
- Cast eye root radius and blended fork fillets remove the crack-start point typical of plate-and-boss weldments.
- Pin bore finish bored to H7 with 0.8 um Ra for long bushing and seal life under oscillating load.
- Quenched and tempered to 28-34 HRC, with hardness mapped across the load path on every heat lot.
- 100% magnetic particle inspection on the eye and fork, plus ultrasonic testing on sections above 12 mm.
- Machined bolt pattern and dowel holes guarantee interchangeability with the existing tipping gear frame.
- Optional welded-on grease nipple boss, machined seal groove and corrosion-protected finish.
Applications
- Rigid and articulated dumpers from 6 t to 40 t payload
- Rear-tipper and three-way tipper truck bodies
- Hook-loader and skip-loader tipping frames
- Agricultural and sugar-cane tipping trailers
- Refuse collection vehicles with bin-lift and body-tip cylinders
- Mining service trucks and low-profile underground haulers
Quality & compliance
Ningbo Ruican runs every ram eye bracket programme inside an IATF 16949 framework, opening with feasibility and DFMEA and closing with PPAP level 3 or 4 documentation. Deliverables include EN 10204 3.1 material certification with heat-lot traceability, quench-and-temper hardness maps, 100% magnetic particle inspection records, ultrasonic reports on thick sections, and full dimensional layouts with capability data on the pin bore. Fatigue and static proof-load testing of the eye under simulated tipping cycles, plus salt-spray validation of the finished coating, are performed on request before series release.
FAQ
What tonnage of dumper is this bracket designed for?
We build to your drawing and duty cycle rather than a fixed catalogue size. Brackets in this programme cover 6 t light site dumpers through 40 t articulated haulers, and we size the eye, fork section and heat treatment to the cylinder thrust and shock factor you specify in the feasibility pack.
Can you match an existing bracket currently bought as a weldment?
Yes. Send the current fabrication drawings or a sample and we will convert it to a one-piece casting with finite-element-backed section changes, usually improving fatigue life while cutting piece weight. We then machine the same pin bore centre, bolt pattern and dowel positions so it drops straight into your tipping gear frame.
What heat treatment do you apply?
Standard supply is quenched and tempered 42CrMo to 28-34 HRC, with normalising available for carbon steel grades. Every heat lot is hardness mapped across the eye and fork, and we hold tensile, yield and Charpy impact records from test coupons cast with the batch for submission in the PPAP package.
How do you verify the casting is crack free?
Every bracket receives 100% magnetic particle inspection on the eye and fork radius, the areas that carry cylinder thrust. Sections above 12 mm are additionally ultrasonic tested. Inspection records are filed against serial numbers where you require traceability, and can be supplied with the shipment documentation.
Do you supply the pin and bushing as well?
We focus on the cast and machined bracket, but we can machine the seal groove, grease groove and bushing bore to your fit specification, and we work with approved pin and bushing partners if you want a sub-assembled kit delivered to your line.
CTA
Send your ram eye bracket drawing, cylinder thrust data and annual volume to Ningbo Ruican for a build-to-print quotation and tooling proposal. Contact Wendy She — sales@cnsandcasting.com — WhatsApp +86-13777124360 for RFQ support, sample status or APQP documentation.
