ASME B18.21.1 LOCK WASHER — 3/8

ASME B18.21.1 is the American standard for inch-series lock washers. This page covers the 3/8 size: dimensions, grades and finishes for quoting.

WASHERS

High-performance industrial fastener under ASME B18.21.1 standard.
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Material Grade Filter

Dimensions

Nominal Thread Diameter (d)9.52 mm
Outer Diameter (d2)17.27 mm
Thickness (T)2.39 mm
Tensile Strength119,946 psi
MaterialGrade 5
SurfacePlain

Helical spring lock washer per ASME B18.21.1-2009 (inch series). T is the section thickness of the washer.

Grades

Grade 5

Grade Grade 5 · Plain

Grade 5

Grade Grade 5 · Zinc

Grade 5

Grade Grade 5 · HDG

Grade 8

Grade Grade 8 · Plain

Grade 8

Grade Grade 8 · Zinc

Grade 8

Grade Grade 8 · HDG

← Back to ASME B18.21.1 LOCK WASHER → B3 Grade Matrix → Engineering Center (C)

Need technical support?

Contact engineering team for verified B2 data reference.

Standard References: Official ASME standards · ASME B18.21.1 reference (fasteners.eu)

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.

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Frequently asked questions

What does ASME B18.21.1 cover?

Lock washers in the inch series: nominal sizes, dimensions and tolerances. It is a US standard, separate from metric DIN 127 spring washer charts.

Are lock washers and plain washers the same?

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.