7/8 Short Arm Alloy Steel Hex Key is an L-shaped alloy steel hex key for socket-drive work where the exact 7/8 in. width matters. The ASME B18.3 width band is 0.8720-0.8750 in.; the key is held just under nominal so it enters an in-tolerance socket and bears on the flats.
Assembly benches and tool cribs use loose hex keys when individual driver sizes need restocking without a full kit. 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 7/8 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. This width is part of the hard-to-find end of the range, where loose-driver restocking is often the real problem.
Call 773-775-7900 or email Sales@coldheaders.com for pricing, availability, or a quote.
