ASME B18.21.1 is the American standard for inch-series lock washers. This page is the size chart: pick a size to see dimensions, grades and finishes.
Deterministic evaluation of fastener standards based on geometry, material, and compliance constraints. Complete engineering specifications across all 54 size/grade/finish variants.
| Standard | Name | Status | Risk Note |
|---|---|---|---|
| ASME B18.21.1, DIN 127-A | Equivalent standards in cluster | IN CLUSTER | — |
| Related Standard | Relationship | Confidence |
|---|---|---|
| DIN 127-A | Cross-system | 0.65 |
ASME B18.21.1 in the concept layer — Fastener Knowledge:
Select a size to view its complete engineering data — including dimensional tolerances, material grades, mechanical properties, and surface finish options.
Non-canonical standard paths are automatically redirected to their canonical ISO equivalents via the Engineering Data Authority Lock. Equivalent standards: ASME B18.21.1, DIN 127-A
| Source (Non-Canonical) | Target (Canonical Route) |
|---|---|
| No redirects — this is the canonical standard | |
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FROZEN: 2026-08-17 20:13:55
ASSET: standard_map_core.csv
CLUSTER: [ASME B18.21.1, DIN 127-A]
ASME B18.21.1 Lock Washer per ASME B18.21.1 specification, available in Grade 5 grade with Plain finish. Engineered for industrial OEM applications requiring 827.0 MPa tensile strength and reliable long-term fastening performance.
Lock washers in the inch series: nominal sizes, dimensions and tolerances. It is a US standard, separate from metric DIN 127 spring washer charts.
No. A lock washer (ASME B18.21.1) is designed to resist loosening; a plain washer (ASME B18.22.1) distributes load and protects the surface.