9/16 Short Arm Alloy Steel Hex Key helps keep socket fastener service practical by pairing the requested width with the specified arm series. The ASME B18.3 width band is 0.5600-0.5625 in.; the key is held just under nominal so it enters an in-tolerance socket and bears on the flats.

Maintenance carts benefit from exact loose sizes because rounded keys can stop a repair before the screw moves. Use the Short Arm series when clearance is limited, and compare the Long Arm twin when added reach is needed.

Cold Headers supports exact-size sourcing for socket-product tooling, including individual alloy steel L-keys. Review the 9/16 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. That context helps purchasing compare the driver geometry without adding unsupported performance claims.

Technical Highlights

• Style: L-shaped hex key, Short Arm
• Material: Alloy Steel
• Width Across Flats: 9/16 in. (0.5600-0.5625 in.)
• Short-Leg Length: 1.656-1.844 in.
• Arm Length: 5.656-5.844 in.
• Dimensional Standard: ASME B18.3

Call 773-775-7900 or email Sales@coldheaders.com for pricing, availability, or a quote.