Spring Lock Washer

External Tooth

Internal Tooth

Combination Tooth

Lock Washers

Material

Regular: SAE 1050 - 1065 carbon steel or equivalent spring steel

High-Alloy: 4037 alloy steel.

18-8 Stainless: SAE 302 - 305 stainless steel.

316 Stainless: SAE 316 stainless steel .

Split Helical Spring Lock Washer

Description

Regular: A coiled, hardened, split circular washer with a slightly trapezoidal wire section.

High Alloy: Dimensionally identical to a regular split lock washer but made from 4037 alloy steel.

Stainless: a regular split lock washer made from austenitic stainless steel.

Applications / Advantages

Regular: (A) applies greater bolt tension per unit of applied torque; (B) provides a hardened bearing surface, creating more uniform torque control; ( C ) provides more uniform load distribution ; (D) resists loosening caused by vibration and corrosion; (E) is preferred lock washer for use with hardened bearing surfaces.

High Alloy: designed for use with Grade-5 & Grade-8 bolts and nuts.

Stainless: for use with stainless nuts and screws of a similar stainless alloy in corrosive environments.

External Tooth Lock Washer

Description

A hardened circular washer with twisted prongs or “teeth” which extend out from the outer edge of the washer.

Applications / Advantages

This is the most preferable of all tooth-lock washers. It offers the greatest locking efficiency since the teeth are on the largest radius and provide greater tensional resistance.

Internal Tooth Lock Washer

Description

A hardened circular washer with twisted prongs or “teeth” which extend inward from the inside edge of the washer.

Applications / Advantages

This is preferred when finished appearance is crucial and the teeth must be hidden under the head of the screw; also recommended for use with small heads such as fillisters.

Internal - External Tooth (Combination) Lock Washer

Description

A hardened circular washer with twisted prongs of teeth protruding from both the inside and the outer edge of the washer.

Applications / Advantages

Preferred lock washer in the following situations: (1) where a larger bearing surface is desired; (2) for an optimum electrical connection; (3) where the hole is oversized or out of round; (4) as an insert between two adjustable pieces where a longitudinal or rotational adjustment must be maintained.