Spring Lock Washer Helical Spring Washer 65Mn SS304 SS316 Zinc HDG (DIN 127B)

The Spring Lock Washer (commonly known as a helical spring washer, split lock washer, anti-vibration washer, or DIN 127B / ISO 10670 fastener) is a split helical ring mechanical washer designed to prevent bolted joint loosening under severe vibration, dynamic impact, and fluctuating cyclic loads. When tightened under a bolt head or hex nut, the split washer flattens and stores elastic spring energy. Simultaneously, its sharp split ends bite into the bearing surfaces of both the fastener and the joint material, providing dual-action resistance against backward rotation in compliance with global ISO standards.

Technical Specifications of Carbon Steel & Stainless Steel Spring Lock Washers

We supply spring lock washers in high-carbon spring steel (65Mn / 70#) for standard and high-tensile mechanical assemblies, as well as austenitic stainless steel (SS304/A2 and SS316/A4) for outdoor and corrosive chemical environments. High-strength carbon steel spring washers undergo precision heat treatment to achieve 40–50 HRC hardness for maximum spring resilience.

Precision Coiling, Cutting and Heat Treatment Process

At our manufacturing facility in Handan, China, spring lock washers are produced using high-speed automated coiling machinery, thermal hardening furnaces, and electroplating lines:

• High-Speed Precision Wire Coiling: High-carbon spring steel round or square wire is continuously coiled into exact helical geometry with tight dimensional control over inner and outer diameters.
• Precision Cutting & End Forming: High-speed shears cut individual rings at clean 90-degree angles to establish sharp end biting corners (DIN 127B square end execution).
• Continuous Mesh-Belt Heat Treatment & Tempering: Carbon steel washers pass through controlled atmosphere quenching and tempering furnaces to achieve uniform 40–50 HRC spring hardness without brittleness.
• Surface Galvanizing & De-Embrittlement Baking: Electro-zinc plated spring washers undergo mandatory 4-hour thermal baking (200°C) immediately after electroplating to eliminate hydrogen embrittlement risks.

Industrial Applications of Spring Lock Washers

Spring lock washers serve as the secondary anti-loosening element across various dynamic mechanical and structural assemblies:

• Automotive & Engine Assembly: Fastening engine exhaust manifolds, starter motor brackets, alternator mounts, and chassis components subjected to continuous engine vibration.
• Heavy Industrial Machinery & Pumps: Securing motor housings, compressor baseplates, gearbox covers, and vibrating screen frames.
• Power Transmission Towers & Steel Structures: Assembled under hex nuts on cross-arm bolts and substation framing to prevent wind-induced vibration loosening.

Quality Control and Export Packaging for Spring Lock Washers

Handan YiHao Fastener enforces strict Quality Assurance (QA) standards for all overseas export orders. Testing procedures include 100% inner/outer diameter plug gauge checks, spring deflection elasticity testing, Rockwell hardness (HRC) verification, and salt spray validation.

All export items are bulk packed in heavy-duty 25kg inner cartons, neatly stacked on ISPM 15 compliant fumigated wooden pallets, and wrapped in protective stretch film for safe ocean freight.