Tapered washers are specialised wedge-shaped washers designed to provide a flat, parallel mating surface on angled structural components.
They prevent bolts from bending or snapping when fastening un-parallel surfaces, such as the sloping flanges of structural I-beams.
Available Angles
The taper of a washer corresponds directly to the slope angle of the structural steel flange it is designed to fit. The most common standard angles include:
5° Taper: The most common standard used for modern metric structural channels and standard rolled steel joists.
6.5° Taper: Frequently utilised for traditional or older steel configurations, heavier structural I-beams, and deeper U-channels.
Common Shapes
D-Shaped Type
Design: These washers feature a flat edge cut into either the outer circumference, the internal diameter, or both.
Purpose: The flat profile prevents the washer from spinning as the nut or bolt is tightened.
Applications: They are strictly preferred in highly compact, restricted spaces where a standard square washer would hit an adjacent flange or wall. Historically, most taper washers were cast iron D-shapes.
Square Type
Design: Modern construction standard washers punched from rolled steel bars.
Purpose: They feature one or two distinct indicator grooves scored onto the thick or top side of the slope. This acts as a visual marker, so installers instantly align the taper correctly against the sloping flange.
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