3/8 Hi-Collar Helical Spring Lock Washer is a hi-collar helical spring lock washer for socket head cap screw counterbores and compact recessed joints. The split helical ring compresses as the screw seats, keeping spring take-up under the head and helping resist loosening under vibration. Pairs with our 1960 Series Alloy Steel Socket Head Cap Screws in the same nominal size.

For automation equipment, packaging machinery, conveyor details, and compact screw joints, the reduced outside diameter helps the washer sit where a broader split washer cannot. Plain carbon steel should be kept dry and oiled; ask about stainless washers as a non-catalog item when exposure matters. Compare Alloy Steel Socket Head Cap Screws when building a complete inch socket-screw order.

Cold Headers supports OEM, repair, and toolroom sourcing where washer style and nominal size both need to match the print. Confirm the nominal screw size, counterbore clearance, material, package quantity, and whether a hi-collar washer is specified.

Technical Highlights

• Nominal Size: 3/8 (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.