DIN 25201 Wedge Lock Washers | Hardened Carbon Steel | Phosphate Black Finish
PRODUCT PARAMETERS
Description
High-performance DIN 25201 carbon steel wedge lock washers with phosphate black coating. Surface hardened to HV 465 plus for maximum vibration resistance with Grade 8.8, 10.9, and 12.9 bolts.
Dimensions
Data Overview
| Size (Metric) | Inner Dia (d1) [mm] | Outer Dia (d2) [mm] | Thickness (T) [mm] | Weight [kg/1000pcs] |
| M6 | 6.5 | 10.8 | 1.8 | 0.8 |
| M8 | 8.7 | 13.5 | 2.5 | 1.7 |
| M10 | 10.7 | 16.6 | 2.5 | 2.5 |
| M12 | 13.0 | 19.5 | 2.5 | 3.5 |
| M16 | 17.0 | 25.4 | 3.4 | 7.3 |
| M20 | 21.4 | 30.7 | 3.4 | 11.0 |
| M24 | 25.3 | 39.0 | 3.4 | 20.0 |
| M30 | 31.4 | 47.0 | 6.6 | 45.0 |
Product Features & Engineering Logic
| Key Feature | Technical Specification | Operational Benefit (Trust Driver) |
| Wedge Cam Logic | Cam Angle (Alpha) is greater than Thread Pitch (Beta). | Prevents bolt rotation by increasing tension if loosening is attempted. |
| Material Strength | High-grade Spring Steel (Heat Treated). | Maintains structural integrity and bite under high clamping forces. |
| Surface Treatment | Phosphate Black (Phosphated). | Provides essential dry-film lubrication and basic industrial corrosion protection. |
| External Serrations | Precision radial grip teeth. | Ensures high-friction contact with both the bolt head and the workpiece surface. |
FAQs
Q1: Why is phosphate black finish important for these washers?
For high-hardness spring steel, phosphate black offers a stable friction coefficient without the risk of hydrogen embrittlement often found in electro-plating, ensuring safe use with 12.9 grade bolts.
Q2: Can I use DIN 25201 washers on slotted or oversized holes?
For such applications, we recommend using our SP (Large Outer Diameter) series to ensure sufficient surface contact and load distribution.
