90° Cup Washer

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

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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 Design Guide

The most complete tool for high-capacity mass timber connections design using ICC and CCMC code approved ASSY structural fasteners.

Structural Mass Timber Fastening Design Guide

Companion to the Structural Screws Design Guide, it provides pre-designed, easy-to-read tables for tens of mass timber connections using high-capacity ASSY self-tapping screws.

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