DIN127 Spring Washer | Carbon & Stainless Steel Ship Washer
TheDIN127 spring washer is a split ring spring washer designed to prevent bolt loosening under shipboard vibration.
Its spring-back action maintains constant axial preload
— making it the standard anti-loosening ship washer paired with structural bolts on hull frames, bulkheads, and engine mounts.
We supply both carbon steel washer (spring steel, hardened and tempered) and stainless steel washer (A2/A4 316 grade) options.
Unlike a flat washer that only distributes load, the split-ring spring washer actively grips the bolt head and nut face to resist rotation from continuous vibration. Every batch is hardness-tested and dimensionally inspected.
| Product Name | Spring Washer |
| Standard | DIN127 (Type A, standard split ring) / DIN127B (Type B, square edge) |
| Type | Split Ring Spring Washer |
| Size Range | M3 to M48 (matches bolt diameter) |
| Material Option 1 | Carbon Steel Washer — Spring steel C60-C75, hardened and tempered |
| Material Option 2 | Stainless Steel Washer — A2 (304) / A4 (316) for marine corrosion zones |
| Surface Treatment | HDG, Zinc Plated, Dacromet (carbon steel) / Passivated (stainless) |
| Hardness | 42-50 HRC (carbon steel), 250-400 HV (stainless) |
| Pair With | Flat Washer DIN125 — spring washer sits between flat washer and nut |
| Application | Ship washer — hull frame bolts, engine mounts, deck machinery, pipe flange |
| Packaging | Inner box / outer carton, labeled by size and material |
For critical shipboard connections,
use the DIN127 spring washer together with a flat washer: flat washer against the workpiece for surface protection, then spring washer under the nut for vibration lock.
Carbon steel washer with HDG for above-deck zones; stainless steel washer (316) for seawater splash and submerged service.
E-mail:sales@sinofastener.com
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