100% of Manufacturing is In-House at ARP

The reasoning behind this is best summed up in a quote from Gary Holzapfel, the founder of ARP:

Over the years, we have found, through experience, that the only way to maintain the quality we require is to keep everything in-house. From heading through machining, grinding, heat-treat, thread rolling, and shot-peening to black oxide treatment we perform every operation in house on our own equipment with our own employees.

Some of the fasteners that we manufacture at ARP will mean the difference between winning and losing. The dilemma is that no one ever knows which fasteners will be put in that position.

Therefore, the only way to ensure that every fastener we make meets our quality standards is to peform every operation in-house.