M3 Stainless Steel Split Lock Washer A2 DIN127 50-Pack

M3 Stainless Steel Split Lock Washer — A2 DIN127, 50-Pack

M3 A2 stainless steel DIN127 split lock washers (spring washers) provide vibration-resistant fastening by using spring tension to maintain clamping force as the joint settles. The split ring design bites into both the nut and the bearing surface, resisting rotation and preventing loosening under vibration and dynamic loads. Essential for motor mounts, fan brackets, and any M3 fastening application subject to vibration.

Key Specifications

Parameter	Value
Thread Size (fits)	M3
Inner Diameter (ID)	3.1mm
Outer Diameter (OD)	6mm
Thickness	0.8mm
Material	A2 Stainless Steel
Standard	DIN127 / ISO 7090
Quantity	50pcs per pack

Why Choose M3 A2 Stainless Split Lock Washers?

• Spring tension anti-loosening — split ring acts as a spring; maintains clamping force as the joint settles under vibration and thermal cycling
• Bite-in anti-rotation — sharp split ends bite into nut and bearing surface, resisting rotation under vibration
• A2 stainless steel — corrosion-resistant; will not rust or weaken in electronics enclosures and outdoor equipment
• DIN127 standard — internationally specified; compatible with all M3 screws, bolts, and nuts
• 50-pack quantity — practical workshop stock for prototyping and production

Typical Applications

• NEMA 17 stepper motor mounting on 3D printers and CNC machines (vibration-prone)
• PC case fan and cooling system mounting (vibration from fan rotation)
• Robotics actuator and servo bracket mounting (dynamic loads)
• Electronics enclosure panel mounting in vibrating equipment
• 3D printer carriage and toolhead assembly (high-speed movement)
• Industrial machinery and equipment fastening (vibration environment)

Compatible With

• All M3 machine screws, cap screws, and bolts
• M3 hex nuts and nyloc nuts
• M3 flat washers (use flat washer first, then split lock washer, then nut)
• Installation order: surface → flat washer → split lock washer → nut

Package Contents

• 50× M3 A2 stainless steel DIN127 split lock washers

Frequently Asked Questions

Q: What is the correct installation order for split lock washers?

A: Correct order from surface outward: (1) flat washer DIN125 against the surface, (2) split lock washer DIN127, (3) hex nut. The flat washer protects the surface; the split lock washer goes between the nut and flat washer to provide spring tension and bite-in anti-rotation.

Q: Are split lock washers effective for vibration resistance?

A: Split lock washers provide moderate vibration resistance suitable for most electronics and light mechanical applications. For high-vibration environments (engines, heavy machinery), use nyloc nuts or thread-locking compound (Loctite 243) instead, as these provide more reliable anti-loosening performance.

Q: Can I reuse split lock washers?

A: Split lock washers can be reused if they retain their spring tension and the split ends are not deformed. If the washer has been fully compressed flat (over-tightened), it has lost its spring function and should be replaced.

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