Nord-Lock 254 SMO® stainless steel washers are suitable for any general saltwater application.

Steel Type: EN 1.4547

Available sizes with normal outer diameter: M3 - M39 (metric) and #5 - 1 1/2” (inches)*

Available sizes with enlarged outer diameter: M3.5 - M27 (metric) and #6 - 1” (inches)*

Washer hardness: ≥ 600 HV0.05**

Corrosion resistance: PREN 45***

Temperature range: -160°C to 500°C

All washers are laser marked with Nord-Lock brand name, control number and type code for increased traceability down to the raw material in the factory.

* View dimension list to determine the required washer size for your bolt.

** In order to assure the unique mechanical wedge-locking function of the Nord-Lock washers, the hardness of the contact surfaces must be lower than the hardness of the Nord-Lock washers. Go to the washer selection guide for the hardness conversion table.

*** PREN (Pitting Resistance Equivalent Number) = %Cr + 3,3x%Mo + 16x%N.

This product is suitable for all your general stainless-steel applications and works very well in saltwater environments. Washers with an enlarged outer diameter (SP) have the same inner diameter as the standard washers. They are designed to be used together with flanged bolts and nuts (ISO 4161,4162) on oversized and slotted holes, or on sensitive surfaces and soft materials.

The washer is through hardened to make sure it is harder than the bolt and contact surface. Nord-Lock washers work with all common bolt grades such as; A2-50, A2-70, A2-80, A4-50, A4-70, A4-80. The material 254 SMO® provides very high corrosion resistance.