Spring Lock Washer for Bolt Fastening & Anti-loose Fixing

Spring Lock Washer for Bolt Fastening & Anti-loose Fixing is a standardized elastic fastener formulated to offset bolt loosening induced by periodic mechanical vibration. All standard specifications are manufactured complying with GB93 industrial standard at Ningbo Gangtong Zheli Fastener Co.,Ltd. Apart from standard raw material and common surface finishing options available for regular orders, the factory’s production department supports customized raw material selection and personalized surface treatment against unique site operating conditions submitted by clients.

GB93 Standard Dimension Reference Table

Nominal Spec d(mm)	Raw Material	Section Thickness s(mm)	Opening Clearance(mm)	Conventional Surface Finish
M6	Grade 45 Carbon Steel	1.6	1.8~2.4	Black Oxide / Electro-galvanized
M8	Grade 45 Carbon Steel	2.1	2.3~2.9	Black Oxide / Electro-galvanized
M10	Grade 45 Carbon Steel	2.6	2.8~3.5	Black Oxide / Electro-galvanized

Material & Manufacturing Specification

Spring Lock Washer for Bolt Fastening & Anti-loose Fixing normally selects 45# medium carbon steel as base raw material. Before stamping processing, raw material hardness is controlled within HB170~HB205. After blanking forming, workpieces receive 320℃ tempering heat treatment to stabilize elasticity, with finished hardness kept at HV320~HV390 to avoid permanent compressive deformation.

Black oxide and electro-galvanizing are two mainstream regular treatments. Based on customers’ corrosive or high-temperature working environment demands, the technical team from Ningbo Gangtong Zheli Fastener Co.,Ltd is capable of sourcing custom raw materials including 304,316 stainless steel and 65Mn spring steel, as well as processing special coatings such as hot-dip galvanizing and Dacromet. Every production batch implements 8% random sampling inspection covering dimensional tolerance and hardness test.

Application & Reliability Test Data

This series washer matches bolt sizes ranging from M3 to M36, widely deployed on mechanical equipment, vehicle chassis, electrical cabinet assembly and industrial pipeline fixing. In-house reliability test shows qualified products maintain original elastic opening after 500-hour uninterrupted reciprocating vibration without elastic fatigue failure, which forms obvious structural difference versus ordinary flat washers. Full range of standard sizes are stocked in warehouse for routine order delivery.

Supply & Product Description

After dimensional sorting and standardized surface finishing, Spring Lock Washer for Bolt Fastening & Anti-loose Fixing delivers stable long-term anti-loose performance for bolt connection assemblies. As one of mature fixed product lines of Ningbo Gangtong Zheli Fastener Co.,Ltd, this washer is stably supplied to domestic manufacturers and overseas hardware importers on long-term orders.