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Lockwasher Extra Heavy

Lockwasher Extra Heavy

Reference: 6474509

Plain Finish

Extra Heavy Split Lock Washer Dimensions (ASME B18.21.1 Extra‑Duty)

Kimes Steel & Rail stocks extra heavy helical spring (split) lock washers made to the ASME B18.21.1 Extra‑Duty series. Their increased outside diameter, section thickness, and bearing area let the washer hold bolt tension under exceptionally heavy loads — a rugged alternative to AREA/AREMA track washers for railroad and heavy industrial bolted connections. In stock in sizes 1/2" through 1‑1/4". All dimensions in inches.

Extra heavy split lock washer dimension diagram showing inside diameter ID, outside diameter OD, thickness T and width W
Dimension reference for the table below (ID, OD, T, W).
Nominal SizeID (Nom.)ID (Min.)OD (Max.)Thickness TWidth WWeight (lb)
1/2"0.5000.5020.9350.1620.2040.03
5/8"0.6250.6281.1510.2020.2420.06
3/4"0.7500.7531.3550.2410.2790.07
7/8"0.8750.8781.5710.2850.3220.11
1"1.0001.0031.7940.3300.3660.16
1‑1/8"1.1251.1292.0130.3750.4110.22
1‑1/4"1.2501.2542.2220.4170.4520.35

Dimensions in inches, per ASME B18.21.1 (Extra‑Duty helical spring lock washers). ID Nominal = basic bolt size; ID Minimum = minimum inside diameter; OD = maximum outside diameter; weight is per piece.

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$ 2.70 $ 2.70

Terms and Conditions
30-day money-back guarantee
Shipping: 2-3 Business Days
Volume pricing
QtyPrice eachSave
1+$ 2.70—
350+$ 2.575%
17,500+$ 2.4310%
Finish: Plain

The Extra Heavy lockwasher is a heavy-duty bolt split lockwasher that serves as a popular alternative to the AREA/AREMA specification track washer in railroad and industrial applications. It delivers greater clamp force than a standard split lockwasher, making it suitable for demanding fastening applications where the full AREMA spec is not required.

Commonly used in railroad track maintenance, bridge work, and heavy structural connections. In stock at Kimes Steel & Rail — contact us for quantity pricing.