3/8 Short Arm Alloy Steel Hex Key covers the 3/8 in. driver position in an alloy steel hex-key range used throughout machine work. The ASME B18.3 width band is 0.3735-0.3750 in.; the key is held just under nominal so it enters an in-tolerance socket and bears on the flats.
Machine setup and changeover work often needs a repeatable L-key at the station rather than a shared tool set. The Short Arm key is the compact member of the pair, while the Long Arm version covers deeper socket access.
For industrial purchasing and maintenance teams, Cold Headers helps match width, series, and catalog identity. Review the 3/8 in. width, Short 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.
Call 773-775-7900 or email Sales@coldheaders.com for pricing, availability, or a quote.
