2023 Retention Knob Catalog

Speci fi cations (cont.) Treatment • Each retention knob is carburized (hardened) to 58-62HRC • Case depth is .020-.030. No Carb is applied to coolant through hole to ensure there is no shrinkage. Core hardness 40HRC • Certi fi cations are maintained for each batch for traceability Finish • Each retention knob is coated utilizing a hot black oxide coating to military speci fi cations • Our retention knobs are 100% covered in black oxide to prevent rust • All retention knob surfaces (not just mating surfaces) have a precision fi nish of 32 RMA micro or better; ISO grade 6N • Certi fi cations are maintained for each batch for traceability Testing • Each retention knob is magnetic particle tested • Retention knobs are tested at 2.5 times the pulling force of the drawbar • Certi fi cations are maintained for each batch for traceability

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