90° Cup Washer

Cost-reducing Solution for Steel to Wood Connections
  • Connection Type
  • Wood/Wood, Wood/Steel
  • Manufacturer
  • SWG

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Countersunk Head

Fast Installation

Stiffer Connections

Product Description

Product Description

The 90° cup washer is a machined steel part available for ASSY countersunk head screws ASSY Ecofast and ASSY VG CSK. The washer provides a proper bearing for the screw head in steel to wood connections without reaming out a steel plate.


Eliminating the need for reaming out steel plate holes to receive the screw head reduces steel plate thickness requirements thereby reducing steel plate cost. The 90° cup washers can be used with countersunk headed ASSY screws [ASSY VG CSK, ASSY Ecofast] for the following fasteners’ diameters:

  • 1/4″ [6 mm]
  • 5/16” [8 mm]
  • 3/8” [10 mm]
  • 1/2″ [12 mm]
Design Guides

Design Guides

Structural Screw Catalog

A catalog with all information on our ICC & CCMC code-approved fasteners, including dimensions, references & design properties.

Structural Screw Connection Design Guide

Companion to the Structural Screws Catalog, it provides easy-to-read tables for the most common mass timber connections with design values & installation instructions.

Technical Blogs

Technical Blogs

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