Spring Lock Washer (DIN 127 — Split Washer)
DIN 127 split spring washers have an angled cross-section that compresses flat under bolt preload. They are widely used and historically standard, though their effectiveness against vibration loosening is debated in engineering literature.
Specifications
| Standard | DIN 127 A (round cross-section), DIN 127 B (square cross-section, most common) |
|---|---|
| Size Range | M3 – M48 |
| Material | Spring steel (typical), Stainless 304/316 |
| Surface Finish | Plain, Zinc plated, Black, Stainless |
Frequently Asked Questions
Do spring lock washers actually prevent loosening?
This is genuinely contested. Several engineering studies (notably Junker testing) have shown that split lock washers under heavy vibration provide little better performance than no washer at all. They remain widely specified by tradition. For critical anti-vibration, modern alternatives (nylon insert nuts, wedge-lock washers like Nord-Lock, thread-locking adhesive) are more effective.
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