Knurled-head hinge pins with a turned groove for an external C-clip. 1045 steel machined components, bare finish, deburred, no heat treatment. Dimensions in inches. Initial design; no hinge load rating assigned. Verify free movement and ring seating after installation.
Pin diameter 1.2500 (+.000/-.002); barrel bore 1.2560 (+.002/-.000); barrel OD 1.750 (+.000/-.005). Knurled head OD 1.750 (+.000/-.025), head thickness 0.500 (+/-.003). Groove diameter 1.172-1.180, groove width 0.056-0.060, bottom radius 0.010 maximum. End land 0.250 (+/-.003). No cotter-pin cross-hole.
Select grip to groove A: distance from underhead face to head-side groove wall, tolerance +/-.003. A = three matching barrel lengths plus .100 nominal clearance. This is not overall pin length.
Length choices: A 3.100 / overall reference 3.9080 / matching barrel length 1.000; A 4.600 / overall reference 5.4080 / matching barrel length 1.500; A 6.100 / overall reference 6.9080 / matching barrel length 2.000.
Compatible clip: Rotor Clip SH-125ST PD external retaining ring (C-clip with plier holes). 100 identical knurled-head hinge pins. C-clips and barrels excluded. Cart quantity 1 = 100 pins.
Manufacturing reference: MMW-HNG-001 Rev A. Use common sheets 1-3 and the matching shaft-size schedule. Variant SKUs match print part numbers. Prices are per sales pack; shipping extra.