Custom & Stock Round Plate Washers
Valley Nut & Bolt is a round plate washer supplier and manufacturer making stock sizes and custom round plate washers cut, punched, and finished to your drawing. Choose A36 carbon steel or stainless steel, plain or hot-dip galvanized at our own Olympia, WA facility, with full product traceability on every order.
Get a Quote on Round Plate Washers
Share your drawing or the details below and our team will return a quote on stock or custom round plate washers. Call 360-754-4877 or request a quote online.
What a Round Plate Washer Does for Your Connection
A round plate washer spreads the load of a bolt or nut across a much wider bearing area than a standard flat washer, which helps keep the base material from crushing and the bolt from pulling through. With no corners, a round profile keeps the same edge distance all the way around the bolt and does not need to be lined up with an edge before the nut is tightened.
That makes round plate washers a good fit where clearance is tight, where corners would catch or interfere with nearby hardware, or where the engineer’s drawing calls for a round profile. Round plate washers are common in:
- Structural steel connections where a square profile is not specified
- Concrete anchor rod installations using ASTM F1554 anchor bolts or all thread rods
- Heavy equipment mounting and base plate connections
- Through-bolted dock, pier, and marine timber connections
- Utility and pole line hardware alongside pole line bolts
Choosing Between Round and Square Plate Washers
A square plate washer of the same width puts more steel under the nut and resists turning against a sill plate or beam, so it is the usual choice for timber framing and seismic connections. Choose a round plate washer when the spec calls for one, when the washer sits close to a flange or edge, or when a uniform edge distance matters more than maximum bearing area. Not sure which fits your connection? Send us the drawing and we’ll help you spec it.
Round Plate Washer Specs We Build To
Five details define a custom round plate washer. Put them on the drawing or the RFQ and we can quote and build without back-and-forth.
The hole starts with the bolt or rod diameter plus clearance. Anchor rod work often calls for an oversized or slotted hole so the washer can cover placement tolerance in the concrete. Our CNC turret punching produces round, oversized, slotted, or offset holes to the dimension on your print.
Outside diameter sets the bearing area, so softer base materials and higher loads need a larger washer. Thickness keeps the plate from cupping or dishing as the nut is torqued down. We supply stock round plate washers and cut non-standard diameters and thicknesses to order.
A36 carbon steel covers most structural, anchor rod, and equipment work. Stainless steel suits connections exposed to salt air, chemicals, or treated lumber where a coating alone is not enough.
Plain or black finish works for dry, interior connections. For outdoor, marine, or high-moisture service, we hot-dip galvanize to ASTM A153 in-house after cutting and punching, so the hole and cut edges carry the same zinc coating as the faces. Our kettle runs a 100% lead-free zinc bath.
Quote Request Checklist
- Bolt or rod diameter and the hole size or slot dimensions
- Outside diameter and thickness
- Material: A36 carbon steel or stainless steel
- Finish: plain, black, or hot-dip galvanized
- Quantity, required delivery date, and a drawing if you have one
A Round Plate Washer Supplier With In-House Galvanizing
Plate washers often move through a separate fabricator and a separate galvanizer before they reach the job site. We handle cutting, punching, forming, and hot-dip galvanizing under one roof, which removes two handoffs from the schedule and keeps quality checks with one team. See our full custom manufacturing capabilities.
Valley Nut & Bolt has supplied fasteners and custom hardware since 1969. Round plate washers ship nationwide, with our own fleet covering job sites along the I-5 corridor between Seattle and Portland. Add matching heavy hex nuts, structural nuts, and anchor bolts to the same order. Back to all plate washers.
Round Plate Washer FAQs
A round plate washer is a thick, large-diameter washer that spreads the load of a bolt or nut over a wider bearing surface than a standard washer. It is used in structural steel, anchor rod, and heavy equipment connections where the base material needs protection from crushing or pull-through.
Use a round plate washer when the drawing specifies one, when the washer sits close to a flange, edge, or other hardware, or when you want the same edge distance all around the bolt. Square plate washers are the usual pick for timber framing and seismic sill plate connections, where maximum bearing area and resistance to turning matter most.
Start with the bolt or rod diameter, which sets the hole size. The load on the connection and the material you are bearing against, whether wood, concrete, or steel, set the outside diameter and thickness. When an engineer’s drawing or building code specifies a size, we build to that spec.
Yes. Our CNC turret punching produces slotted, oversized, and offset holes in custom round plate washers. These are common on anchor rod connections where the washer needs to cover placement tolerance in the concrete.
Yes. We hot-dip galvanize round plate washers to ASTM A153 in our own facility after they are cut and punched, so the hole and cut edges are coated along with the faces.
Both. We supply stock round plate washers and fabricate custom sizes in non-standard diameters, thicknesses, and hole patterns.
Yes. As a round plate washer supplier to contractors, fabricators, and industrial buyers nationwide, we handle volume orders, with our own fleet delivering along the I-5 corridor. Every order includes full product traceability.
Ask Our Team
Give us a call or fill out the form and one of our team members will be in touch as soon as possible to answer your questions.
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