Bolt Pitch

[sunman]

The black nitride is a thermal process that does increase bolt strength and resistance to fatigue.
The cadmium is just an electroplating.
The bolt that failed was maybe not up to specs.
Run the bolts that fit and check them after use, along with your other suspension bolts.

[Blas]

Aircraft Spruce is an excellent source for extremely high quality and specific requirement bolts, etc. such as specific bolt shank “grip” lengths.
Blas

[spdbrake]

Originally Posted by sunman

The black nitride is a thermal process that does increase bolt strength and resistance to fatigue.
The cadmium is just an electroplating.
The bolt that failed was maybe not up to specs.
Run the bolts that fit and check them after use, along with your other suspension bolts.

The Black Oxide coating you see on hardware including ARP is a cheap quick corrosion resistance coating and does nothing for the strength of the hardware. Not as durable as Cad or Zinc plating.

Nitriding does give a hard durable finish (a few thousandths of and inch) to the item for wear properties. Typically used on Cylinder walls of Hyd actuators and engines, crank journals, axles, bolt and slide areas of
weapons.