9/16 Hi-Collar Helical Spring Lock Washer supports socket head cap screw installations that need spring take-up inside the counterbore. The washer is not a substitute for joint design review, but it is the washer style commonly paired with recessed socket head cap screws. Use it alongside 1960 Series Socket Head Cap Screws when the drawing calls for a hi-collar washer.

Maintenance teams may use this size in die and fixture builds, jig plates, toolroom repairs, and guided machine details when the matching socket cap screw needs a compact lock washer.

Cold Headers helps maintenance teams and distributors match the small companion parts that keep socket screw orders complete. Review the cap screw size, counterbore diameter, joint stack-up, and washer style before substituting a standard split washer.

Technical Highlights

• Nominal Size: 9/16 (matches screw size)
• Style: Hi-Collar (reduced OD, increased section vs. standard split washer)
• Type: Helical Spring Lock Washer
• Fits: Socket head cap screw counterbores
• Material: Carbon Steel
• Dimensional Standard: ASME B18.21.1

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