12mm Internal Tooth Star Lock Washers Push On Locking Washers Black Steel 65Mn Anti Rust Wear Resistant Heavy Duty Retaining Clips Fasteners 50 Pack For Auto And Gearhead Projects

12mm Black 65Mn Star Lock Washers, 50 Pack, Heavy Duty
✔️ ID 12mm, OD 25mm, 0.9mm thick, 2.8mm tall, black 65Mn

These internal tooth star washers are designed to bite into fasteners and substrates, delivering spring force that increases friction and resistance to rotation. They're widely used in machinery, automotive parts, electronics enclosures, and gearhead projects where vibration needs control.

✅ 12mm inside diameter
✅ 25mm outside diameter
✅ 0.9mm thickness
✅ 2.8mm height
✅ Color: Black
✅ Material: 65Mn steel with anti-rust properties
✅ Pack: 50 pieces

💡 What is a star lock washer used for in automotive and machinery setups? This handy fastener adds spring tension to grip a fastener and substrate, helping resist loosening from vibration.

• Handy for machinery, automotive, furniture, and gearhead projects
• Improves friction and prevents rotation under vibration
• Distributes load to protect threads and reduce wear