Crack is a metal hardware, common name spring pin, safe pin!
Cotter pin is a mechanical part, in order to avoid damage to the hole wall, grease in the pin hole grease.
Cracking commonly used high-quality steel, made of good elastic material.
For thread connection. After the nut is tightened, insert the cotter pin into the nut groove and the tail hole of the bolt and pull the crown of the opening pin to prevent the relative rotation of the nut and the bolt.
Crack is a metal hardware, common name spring pin.
The standard pin is GB / T91-2000
Cylindrical pin standard range Nominal size of 0.6 ~ 20mm cotter pin
(GB / T5232) Stainless steel: Cr17Ni7,0Cr18Ni9Ti (GB / T1220) Stainless steel: Cr17Ni7,0Cr18Ni9Ti (GB / T1220)
Toughness: Cotter pin Each foot should be able to withstand repeated bending, and in the bending part of the fracture or cracks do not occur.
Bend method: pull the cotter and clamp any of its straight legs in the mold (the flattening should not occur); then bend the cot 90 ° and turn it once. Test speed should not exceed 60 times / min. Inspection mold should be made out of semi-circular slot, the diameter of the cot is the nominal size. The jaws should have fillets of r = 0.5mm.
The eye socket should be rounded as much as possible.
The cross-section of the cuffs should be round, but the fillet has a radius r = (0.05 ~ 0.01) dmax (d-cotter pin diameter).
The difference between the two positions of the opening pin and the two feet should not be greater than the difference between the nominal size of the cottage and the dmax.
The opening pin agreed to make the opening, the width of the plane within the two feet should meet the specifications.
Surface defects: The cotter surface should not have burrs, irregular and harmful defects.
