Flat Washers

Flat washers are fastening components placed beneath bolts, screws, or nuts to create a broader bearing surface and help distribute tightening force across a mounting surface. Commercial maintenance, assembly, installation, and trade teams use them to support fasteners, help reduce pull-through, create spacing, and address loosening associated with vibration in compatible hardware assemblies.

Product Display:
Helpful Buying Guide

Choose Flat Washers for the Hardware and Assembly at Hand

Compare washer size, inside and outside dimensions where listed, material, finish, profile, and pack quantity against the requirements of the fastener and assembly. The available selection includes standard and precision flat washers, extra-thick heavy-duty styles, and a machinery bushing for shaft and equipment repair applications.

Visual Guide

Popular examples in this category

M6 Steel Zinc-Plated Flat Washers, Pack of 200M6 Steel Zinc-Plated Flat Washers, Pack of 200WBB2100895#8 SAE Flat Washers, 3/16 in. ID, Zinc-Plated Steel, Pack of 100#8 SAE Flat Washers, 3/16 in. ID, Zinc-Plated Steel, Pack of 100WBB219981018-8 Stainless Steel Flat Washers, 5/8 in., 25-Pack18-8 Stainless Steel Flat Washers, 5/8 in., 25-PackWBB31484201/2-Inch Precision Flat Washer, Black Oxide, 10-Pack1/2-Inch Precision Flat Washer, Black Oxide, 10-PackWBB2264296
Use Cases

Support fasteners across a wider surface

Flat washers are used under bolts, screws, or nuts to spread tightening force, provide a bearing surface, help reduce pull-through, and create spacing in an assembly.

How to Choose

Match dimensions and washer profile

Start with the compatible fastener size or stated inside diameter. Then compare outside diameter, thickness when listed, standard, precision, or extra-thick profile, material, finish, and required quantity.

Applications

Built for maintenance, installation, and assembly

The represented products support routine fastening work, planned replacements, bolted connections, plumbing, heating and air, electrical trade work, and manufacturing or maintenance tasks.

Additional Info

Consider the bushing separately

A steel machinery bushing is also represented for filling gaps on shafts or supporting repairs in industrial and farm machinery and power transmission assemblies. Select it by its shaft opening and stated grade and gauge requirements.

M6 to 5/8 in.Washer sizes represented

Options include metric, SAE, numbered, and inch-based sizes.

10 to 200Pieces per washer pack

Pack quantities support small jobs through ongoing fastening work.

18-8 stainlessMaterial option

Provides corrosion and chemical resistance for fastening support.

3/16 in.Listed heavy-duty thickness

The 1/2-inch heavy-duty washer has a stated 3/16-inch thickness.

Comparison Guide

Compare the represented fastening component types

Use the component style, dimensions, construction, and stated purpose to narrow the selection.

Component typeWhat to compareStated role
Standard flat washersCompatible fastener size, inside diameter where listed, material, finish, and pack countProvide a broader bearing surface, distribute tightening force, and can help with pull-through or spacing.
Precision and heavy-duty flat washersPrecision size or extra-thick profile, outside diameter, thickness where listed, case-hardened steel, and black oxide finishSupport fastening contact in hardware assemblies; extra-thick styles provide increased strength.
Steel machinery bushing1-1/4 in. inside diameter, plain finish, Grade 2 14-gauge design, and 50-pack quantityFill gaps on shafts or support repairs in machinery and power transmission assemblies.
Planning Guide

Plan the right fit before choosing

Start with fit

Match the washer to the fastener and assembly dimensions

Select a washer size that corresponds to the fastening hardware or stated opening requirement. Options represented include SAE #6 and #8, #10, M6, 5/16 inch, 1/2 inch, 5/8 inch, and 5/8 inch washers with a listed 1/4 inch inside diameter and 5/8 inch outside diameter. Some products also provide specific outside diameter and thickness details for closer comparison.

  • Use the stated fastener size, such as M6, #8 SAE, #10, or 5/16 inch.
  • Check inside diameter where it is listed, including 3/16 inch, 1/4 inch, and 1-1/4 inch for the machinery bushing.
  • Compare outside diameter and thickness when the assembly calls for a defined bearing area or profile.
Compare materials and profiles

Choose the construction and form that suit the stated need

Steel, zinc-plated steel, 18-8 stainless steel, brass, and case-hardened or through-hardened steel options are represented. Stainless steel options provide corrosion and chemical resistance, while brass helps resist corrosion and tarnishing. For profile needs, compare standard flat washers with precision washers and heavy-duty extra-thick washers.

  • Choose zinc-plated steel or black oxide when the specified finish is needed.
  • Consider 18-8 stainless steel where corrosion and chemical resistance are required.
  • Use a precision washer for an application requiring the listed precision size.
  • Compare extra-thick heavy-duty washers when increased strength is needed.
Plan quantities and related work

Buy the pack count that fits installation or replenishment work

Available pack quantities range from 10-piece packs for planned fastening work to 25, 50, 100, and 200-count packs for installation, maintenance, replacement, and ongoing assembly needs. For hardened washer applications, a 5/16 inch through-hardened option is designed for use alongside Grade 5 and Grade 8 bolts and nuts.

  • 10-packs suit smaller planned installation or replenishment needs.
  • 100- and 200-count packs support ongoing fastening work.
  • The 50-pack machinery bushing supports multiple maintenance and repair tasks.
FAQ

Common questions before buying

What do flat washers do?

They provide a broader bearing surface beneath a bolt, screw, or nut to help distribute tightening force across the mounting surface.

How do I select a flat washer size?

Match the washer to the compatible fastener size or stated inside diameter, then compare outside diameter and thickness when those dimensions are required.

What materials are represented in this category?

The selection includes steel, zinc-plated steel, 18-8 stainless steel, brass, case-hardened steel, and case-hardened carbon steel.

When should I consider a heavy-duty flat washer?

Choose an extra-thick heavy-duty option when increased strength is needed in a 1/2-inch or 5/8-inch fastening application.}]},

!