F436 Washer Types
Portland Bolt manufactures the full range of ASTM F436 hardened washers for high-strength structural bolting. Each washer type below is built for a specific connection condition, whether that is a standard round hole, an oversized or slotted hole, a sloped bearing surface, or a location with limited edge clearance. This page gives an overview of every type and links to a detailed page for each, so you can find the washer that matches your connection and specification.
All F436 washers share the same core purpose: they provide a hard, heat-treated bearing surface beneath the turned element of a connection, resisting embedment into the connected steel and distributing the clamping load as the assembly is tightened. What differs between the types is geometry, thickness, and shape, each suited to a different situation. Washers are available in Type 1 carbon or alloy steel and Type 3 weathering steel, in plain and hot-dip galvanized finishes, with custom sizes and shapes manufactured to order.
F436 Washer Types
- Standard Circular Washers — the most common hardened washer for structural bolts.
- Wide Outside Diameter (USS Pattern) Washers — larger OD for greater bearing area.
- Extra Thick Washers — for oversized or slotted holes and high-load connections.
- Beveled Washers — for sloped surfaces such as American Standard beams and channels.
- Clipped Washers — edge-trimmed for tight clearances near welds or adjacent members.
- Custom Washers — non-standard sizes, shapes, and finishes.
Choosing the Right Washer
The right washer depends on the connection, not just the bolt size. Start with the hole and the bearing surface: a standard round hole on a flat surface calls for a standard circular washer, an oversized or slotted hole calls for an extra thick washer, and a sloped flange calls for a beveled washer. Edge clearance, bearing area requirements, and the material type of the surrounding steel then narrow the choice further. If your requirement falls outside the standard patterns, a custom washer can be manufactured to fit. Each type page covers when to use that washer, its finishes and material types, and its dimensions.