Spring-Lock Washer

ASME B18.21.1 Regular Helical Spring-Lock Washers are inch-series washers for general bolted-joint applications. This category covers the complete Table 1 Regular series from No.2 through 3 in, with the carbon-steel and stainless-steel material and finish combinations listed in the catalog.

ASME B18.21.1 dimensions and material selection

Each product page shows the published inside-diameter limits, maximum outside diameter, minimum mean section thickness, minimum section width, minimum bearing width, and a calculated theoretical mass. ASME B18.21.1 also defines material, hardness, processing, workmanship, and twist-test requirements. Confirm the exact material grade and finish specification before ordering.

Important engineering note

The word “lock” is the conventional name of this washer family and does not guarantee permanent locking of a joint. For zinc-electroplated carbon-steel washers, hydrogen-embrittlement relief and post-plating verification are essential ordering requirements. Critical or high-vibration connections must be evaluated according to joint design, preload, and service conditions.