1/8 Long Arm Alloy Steel Hex Key is a practical replacement tool when the socket needs full-flat engagement from an in-range hex key. The ASME B18.3 width band is 0.1235-0.1250 in.; the key is held just under nominal so it enters an in-tolerance socket and bears on the flats.
Replacement of rounded or worn keys helps protect expensive socket fasteners during service and teardown. Use the Long Arm series for deeper access, and compare the Short Arm twin when space around the socket is tight.
Cold Headers supports exact-size sourcing for socket-product tooling, including individual alloy steel L-keys. Review the 1/8 in. width, Long Arm format, short-leg length, and arm length before ordering. The listed B and C ranges keep the tool geometry tied to this exact catalog row. That context helps purchasing compare the driver geometry without adding unsupported performance claims.
Call 773-775-7900 or email Sales@coldheaders.com for pricing, availability, or a quote.
