9/64 Short Arm Alloy Steel Hex Key is part of the driver shelf that supports cap screws, set screws, shoulder screws, and pipe plugs. The ASME B18.3 width band is 0.1391-0.1406 in.; the key is held just under nominal so it enters an in-tolerance socket and bears on the flats.
Equipment installation crews use individual keys to support field setup, access panels, and machine leveling work. Short Arm geometry favors compact reach and quick hand rotation; the same width in Long Arm form is the natural comparison.
Since 1962, Cold Headers has supplied specialty socket hardware and the hex keys that complete the working system. Review the 9/64 in. width, Short Arm format, short-leg length, and arm length before ordering. For a non-catalog width or series, Cold Headers can help confirm the request before quoting.
Call 773-775-7900 or email Sales@coldheaders.com for pricing, availability, or a quote.
