ASME B18.21.1 Helical Spring Lock Washers — Inch Series (0.072 – 4 in)

Documents

Shipments are backed by Mill Test Certificate (MTC), Dimensional Report, Salt Spray Test Report on request, with full batch traceability from raw material to finished product. Quality management follows the owner-confirmed compliance list: ISO 9001:2015, RoHS, REACH. Exact document sets are confirmed on the order.

Quotation

• The fastener family (ASME B18.21.1 Helical Spring Lock Washers — Inch Series (0.072 – 4 in)) plus the standard designation from your drawing — DIN / ISO / JIS / ASTM / ANSI, or a drawing for custom parts.
• Size (diameter and length), thread type (metric or inch), property class or grade, and coating or finish.
• Quantity per size and your target delivery date.
• Destination country, and any required documents (for example a mill test certificate) so the quote includes them.

Sample & supply

Minimum order quantity is 10,000 pieces. Stock items run 3–7 days. Quantities or variants outside the standard range are confirmed at quotation.

Storage & shipping

Parts are packed for export and shipped factory-direct to buyers in Europe, Asia, the Americas and the Middle East. Store fasteners dry and protected until installation, and keep coated parts in their packaging until use; specific packing and preservation requirements can be stated on the order and confirmed at quotation.

Does a helical spring lock washer actually prevent loosening, and what should I specify so it can?

It earns its keep on a specific class of problem: joints with small, frequent relative movements — vibration from motors, compressors, panel-mounted hardware — where the split ring's spring force keeps the nut loaded between micro-slips and its edges bite the bearing surfaces. What it does not do is replace proper preload: an under-torqued joint or one with a short bolt (low stretch, so joint movement eats the clamp quickly) will loosen with any washer hardware, and on long-credentialed dynamic joints (rotating equipment, thermal cycling), engineered solutions — nord-lock style pairs, prevailing-torque nuts, cotter hardware — outperform the split ring. The specification that makes the washer able to do its job is material: the collected chart gives geometry only, so hardness and spring-grade material arrive at RFQ, and this is the line most often missed in procurement — a soft split washer is geometry without function. Practical ordering: match the washer size to the bolt (the chart's ID limits show the fit is a snug slide, not a press), assemble ends-out, torque to the joint's spec, and for anything beyond light-duty vibration, name the locking strategy on the drawing rather than defaulting to hardware.

What is the MOQ and lead time for washers on this standard?

The minimum order quantity is 10,000 pieces. Stock items ship in 3–7 days; non-stock items are confirmed at quotation. Common inch sizes are widely stocked; confirm the exact schedule against quantity and size mix at quotation.