Pinstructure

These washers are typically used in heavy bolted applications such as bus bars, transformers and flanges etc. They are also suitable to use with high tensile bolts (8.8). They take up movement in line with the fixing bolt, e.g. temperature changes or settlement over time.

Available in the following materials:

• Carbon Steel (Series F66A)
• A2 Stainless steel (Series F66D)

Sizes from M2 to M30

These type of washers have a knurled ring on the contact surface with the bolt/screw’s under head or nut.

The technical features make these washers a multifunctional product suitable for several applications:

• The knurled ring effectively prevents the bolt getting loose
• The spring force generated by the washer during tightening allows for compensation of clearance of the assembled parts, maintaining the bolts tightening force.
• The conical shape allows even distribution of the forces exerted by the bolt or nut in application.

They are generally used with nuts and bolts of classes 6.8, 8.8 and 10.9. Thanks to their features they are used in many fields:

• Electromechanics
• Heavy construction machines
• Transmissions

Our stocked range:

• Small (Series F67A or F67D)
• Medium (Series F68A or F68D)
• Large (Series F69A or F69D)
• Toothed (Series F70A or F70D)

Available in the following materials:

• Carbon Steel
• A2 Stainless steel
• A4 Stainless steel (Medium type)

These washers a very similar to the NFE 25-511 type in many ways so have all of the advantages as above but they are dimensionally different in certain cases and also support the smaller machine screw or socket head cap screw assemblies.

Available in the following materials:

• Carbon Steel
• A4 Stainless steel (Medium type)

For full specification details and size range stocked, please download our product data sheets.