Internal Serrated Lock Washer

Handan Hengmai Fasteners Manufacturing Co., Ltd. is one of the most reliable manufacturers and suppliers of internal serrated lock washer in China. As we have world-leading production equipment and strong manufacturing capabilities, we warmly welcome you to buy bulk high quality internal serrated lock washer for sale here from our factory. Customized orders are welcome.

Internal serrated lock washers are high-reliability anti-loosening fastening accessories manufactured in line with DIN6798J, ISO and GB standard specifications. Different from ordinary flat washers and external serrated washers, this product features fine serrated teeth distributed on the inner circle, which tightly bite the bolt head or nut contact surface during assembly. It effectively eliminates assembly gaps and provides strong friction self-locking performance, solving the common loosening problem of fasteners under vibration, impact and alternating load conditions. With compact structure and hidden inner-tooth design, it will not interfere with component installation and is suitable for narrow and limited assembly spaces. Our factory strictly implements ISO9001 full-process quality management, maintains full-size metric inventory, and supports customized surface treatments, providing stable anti-loosening supporting solutions for mechanical assembly, vehicle manufacturing and industrial engineering projects in global and Belt-and-Road markets.

1. Precision internal serrated tooth design forms uniform biting friction with fastener contact surfaces, providing powerful anti-loosening and anti-slip performance against mechanical vibration and alternating impact loads;

2. Inner serrated structure avoids outer-edge protrusion interference compared with external serrated washers, perfectly adapting to confined installation spaces and covered assembly scenarios;

3. Made of high-elastic spring steel and stainless steel materials, the washer maintains stable elastic tension for a long time, effectively compensating for assembly gap shrinkage caused by mechanical fatigue and temperature change;

4. Multiple anti-corrosion surface treatments deliver excellent rust and oxidation resistance, adapting to indoor, outdoor and humid industrial working environments with long service life;

5. Standard dimensional accuracy ensures perfect matching with standard bolts and nuts, featuring flat fitting, convenient installation and no damage to fastener surfaces.

Internal serrated lock washers are specially used for auxiliary anti-loosening fastening of bolt and nut connections. They are widely applied in precision instrumentation, automotive and motorcycle parts, hydraulic equipment, electrical cabinet assemblies, engineering machinery, pipeline fastening and automation equipment manufacturing. Thanks to their hidden inner-tooth structure, they are the preferred anti-loosening accessories for compact equipment assembly and surface-flush installation requirements.

⚠️ Reminder: This product is used for auxiliary anti-loosening protection of fastener connections. It is not applicable for ultra-high load, extreme high temperature and strong corrosion working conditions without material upgrading.

Each batch of internal serrated lock washers undergoes strict pre-shipment inspections, including dimensional tolerance detection, serrated tooth profile inspection, elastic tension sampling test and surface flatness detection. Surface-treated products complete professional salt spray anti-corrosion and aging resistance tests. Raw material qualification certificates are fully archived for traceability. SGS third-party authoritative inspection reports can be provided according to bulk order requirements to ensure full compliance with international standards.

Standard packing adopts inner moisture-proof PE bags + outer woven bags with pallet stacking for sea freight to prevent moisture, dust and extrusion deformation. Small-batch orders support carton packaging with customized printed shipping marks. Products shall be stored in dry, ventilated and corrosion-free warehouses, avoiding long-term damp exposure and heavy pressure stacking that may cause elastic fatigue. We cooperate with multiple professional freight forwarders to provide FOB, CIF, DDP and other logistics solutions with stable and predictable delivery cycle.

Our professional technical team provides targeted fastener matching guidance and installation process suggestions according to customer's equipment working conditions and load requirements. For quality problems and dimensional errors caused by our factory, we support free replacement and bear all related freight costs. Pre-sales engineers provide professional specification selection and customized processing services including special materials and exclusive surface treatments to meet personalized industrial supporting needs.

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