Wedge Lock Washers
| Standard | DIN 25201 |
|---|---|
| Material | Carbon Steel |
| Strength Grade | 8.8 / 10.9 Compatible |
| Size Range | M8-M36 |
| Surface Treatment | Zinc Flake |
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Product Description
Product Description & Key Specifications
Wedge lock washers are paired anti-loosening washers used in bolted joints exposed to vibration, dynamic load or clamp-load loss. They are supplied to DIN 25201 in carbon steel, compatible with 8.8 / 10.9 bolt assemblies, and finished with zinc flake coating for corrosion protection and controlled coating thickness.
A wedge lock washer pair works differently from a spring washer. The cam faces create a wedge effect while the outer teeth grip the mating surfaces, helping resist rotational loosening when the joint is correctly tightened. The washer pair should be selected by bolt size, surface hardness, bearing surface condition and available clearance.
Common RFQ sizes include M8, M10, M12, M16, M20, M24, M30 and M36. They are used in railway assemblies, construction machinery, steel structures, vibrating equipment and field-installed joints where maintenance access is limited and loosening risk must be reduced.
| Product type | DIN 25201 wedge lock washers / anti-loosening washer pairs |
|---|---|
| Standards | DIN 25201 |
| Material | Carbon steel |
| Strength grade | Compatible with 8.8 / 10.9 bolt assemblies |
| Size range | M8-M36 |
| Common models | M8, M10, M12, M16, M20, M24, M30, M36 wedge lock washer pairs |
| Washer form | Paired wedge-lock washers with cams and outer teeth |
| Surface finish | Zinc flake coating |
| Matched hardware | Hex bolts, structural bolts, threaded rods or machine bolts where approved |
| Documentation | CoC, dimensional report and coating report on request |
Dimensions & SpecificationsDIN 25201
Technical Drawing
Dimensional Table
| Parameter | Φ3 | Φ3.5 | Φ4 | Φ5 | Φ6 | Φ8 | Φ10 | Φ12 | Φ14 | Φ16 | Φ18 | Φ20 | Φ22 | Φ24 | Φ27 | Φ30 | Φ33 | Φ36 | Φ39 | Φ42 | Φ45 | Φ48 | Φ52 | Φ56 | Φ60 | Φ64 | Φ68 | Φ70 | Φ76 | Φ80 | Φ85 | Φ90 | Φ95 | Φ100 | Φ105 | Φ110 | Φ115 | Φ120 | Φ125 | Φ130 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| d/max | 3.5 | 4 | 4.5 | 5.5 | 6.6 | 8.8 | 10.9 | 13.2 | 15.4 | 17.2 | 19.7 | 21.6 | 23.6 | 25.5 | 28.6 | 31.6 | 34.6 | 37.6 | 40.6 | 43.5 | 46.7 | 50.1 | 54.1 | 59.6 | 63.6 | 67.6 | 71.6 | 75.6 | 79.6 | 83.6 | 88.6 | 92.9 | 97.9 | 103.9 | 108.9 | 113.9 | 118.9 | 123.9 | 128.9 | 133.9 |
| d/min | 3.3 | 3.8 | 4.3 | 5.3 | 6.3 | 8.6 | 10.5 | 12.8 | 15 | 16.8 | 19.3 | 21.2 | 23.2 | 25.1 | 28.2 | 31.2 | 34.2 | 37.2 | 40.2 | 43 | 46.2 | 49.6 | 53.6 | 59.1 | 63.1 | 67.1 | 71.1 | 75.1 | 79.1 | 83.1 | 88.1 | 92.4 | 97.4 | 103.4 | 108.4 | 113.4 | 118.4 | 123.4 | 128.4 | 133.4 |
| dc/max | 7.2 | 7.8 | 7.8 | 9.2 | 11 | 13.7 | 16.8 | 19.7 | 23.2 | 25.6 | 29.2 | 30.9 | 34.7 | 39.2 | 42.3 | 47.3 | 48.8 | 55.3 | 58.8 | 63.3 | 70 | 75 | 80 | 85 | 90 | 95 | 100 | 105 | 110 | 115 | 120 | 130 | 135 | 145 | 150 | 155 | 165 | 170 | 173 | 178 |
| dc/min | 6.8 | 7.4 | 7.4 | 8.8 | 10.6 | 13.3 | 16.3 | 19.3 | 22.8 | 25.2 | 28.8 | 30.5 | 34.3 | 38.8 | 41.7 | 46.7 | 48.2 | 54.7 | 58.2 | 62.7 | 68 | 73 | 78 | 83 | 88 | 93 | 98 | 103 | 108 | 113 | 118 | 128 | 133 | 143 | 148 | 153 | 163 | 168 | 171 | 176 |
| H/max | 2.05 | 2.05 | 2.05 | 2.05 | 2.05 | 2.75 | 2.75 | 2.75 | 3.65 | 3.65 | 3.65 | 3.65 | 3.65 | 3.65 | 6.05 | 6.05 | 6.05 | 6.05 | 6.05 | 6.05 | 7.75 | 7.75 | 7.75 | 7.75 | 7.75 | 7.75 | 10.25 | 10.25 | 10.25 | 10.25 | 10.25 | 10.25 | 10.25 | 10.25 | 10.25 | 10.25 | 10.25 | 10.25 | 10.25 | 10.25 |
| H/min | 1.55 | 1.55 | 1.55 | 1.55 | 1.55 | 2.25 | 2.25 | 2.25 | 3.15 | 3.15 | 3.15 | 3.15 | 3.15 | 3.15 | 5.55 | 5.55 | 5.55 | 5.55 | 5.55 | 5.55 | 6.25 | 6.25 | 6.25 | 6.25 | 6.25 | 6.25 | 8.75 | 8.75 | 8.75 | 8.75 | 8.75 | 8.75 | 8.75 | 8.75 | 8.75 | 8.75 | 8.75 | 8.75 | 8.75 | 8.75 |
Engineering references
Technical resources
Review the applicable dimensions, drawing and standard relationship before confirming the ordered specification.02
Selection
Selection Advantages by Application
Railway and Transit Assemblies
Wedge lock washers are used in selected rail equipment, brackets and vibration-loaded bolted joints where anti-loosening performance is required. Confirm approval against the railway project specification.
Railway fastenersConstruction Machinery and Steelwork
M12-M30 zinc flake wedge lock washers are common for heavy equipment guards, brackets, frames and site-installed steel joints that see vibration or repeated service load.
Construction fastenersIndustrial Equipment and Maintenance
Anti-loosening washer pairs help reduce maintenance risk on pumps, skids, machinery bases and equipment frames where a standard flat washer does not address loosening concerns.
Industrial equipment fasteners03
Assembly
Recommended Matching Products
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Manufacturing
Manufacturing & Quality Control
Manufacturing CapabilityQuality Control
Precision forming of cam and tooth washer geometryMaterial, size and washer pair verification before packaging
Heat treatment where required for washer performanceHardness and dimensional inspection by lot
Zinc flake coating for corrosion protectionCoating thickness, adhesion and appearance inspection
Washer pairs supplied pre-assembled or packed by sizePair orientation, quantity and package label checks
Project packaging for rail, equipment and construction ordersCoC, dimensional report and coating report prepared on request
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FAQ
Common Questions Before RFQ
How do wedge lock washers prevent loosening?
They use paired cam surfaces and outer teeth to create a wedge effect that resists rotational loosening when the bolted joint is properly tightened.
Are wedge lock washers the same as spring washers?
No. Wedge lock washers are paired cam washers for anti-loosening performance, while spring washers rely on spring action and are a different product type.
Which bolt grades are they compatible with?
This product range is positioned for 8.8 / 10.9 compatible assemblies. Final selection should confirm bolt grade, washer hardness and mating surface conditions.
What finish is available?
Zinc flake finish is available for corrosion protection and controlled coating thickness in construction, railway and machinery applications.
What sizes are commonly requested?
Common RFQ sizes include M8, M10, M12, M16, M20, M24, M30 and M36 washer pairs.
Need DIN 25201 wedge lock washers?
Send bolt size, bolt grade, joint application, coating requirement, quantity and packaging needs. We can quote zinc flake wedge lock washer pairs for rail, construction and industrial equipment assemblies.
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