1/4 Short Arm Alloy Steel Hex Key supports the socket-screw system by matching a 1/4 in. width across flats to the working tool. The ASME B18.3 width band is 0.2485-0.2500 in.; the key is held just under nominal so it enters an in-tolerance socket and bears on the flats.
Heavy equipment and large socket cap screws at the upper end call for wider keys that are harder to restock loose. 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 1/4 in. width, Short Arm format, short-leg length, and arm length before ordering. Cold Headers can review non-catalog widths or arm-series requirements as quote requests.
Call 773-775-7900 or email Sales@coldheaders.com for pricing, availability, or a quote.
