Machined For Precise Fit And Long-Service Stability

• Flat, Round Thin Walls.Grinding stock and clamping pressure are managed on hardened parts, keeping walls round and end faces flat so collars slip over a shaft without distortion.
• Symmetrical Indexing Notches.End-face notches are cut in matched positions and verified on the CMM, so anti-rotation location stays identical from piece to piece.
• Internal And External Surfaces Ground Together.Bores and outside diameters share one setup and one datum, then pull concentric so the fit and the locating features agree on the finished part.

Factory-Direct Precision Manufacturing

With 20+ years of cumulative machining experience at your service, PFT delivers DFM-optimized solutions that reduce cost without compromising quality. Our ISO 9001:2015 and ISO 13485:2016 certified, TUV Rheinland-verified Shenzhen factory operates 79+ CNC machines with a monthly capacity of 300,000+ pieces.

Raw Materials & Compliance Proof

1Cr17Ni2 martensitic stainless steel (AISI 431 class) is our standard grade for these collars, with 304, 316L and 17-4PH stainless available. Parts are hardened and tempered to your hardness band before finishing. Every shipment includes CMM Dimensional Inspection Reports and Material Mill Certificates, and hardness records travel with the parts.