Split Lock Washers

Split lock washers are fastening components used with compatible threaded fasteners in commercial maintenance, assembly, shop, and general fastening work. Their split, deflecting design helps support fastened connections where rotation, reduced friction, vibration, or corrosion may contribute to loosening.

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Helpful Buying Guide

Split Lock Washer Buying Guide

Choose split lock washers by matching the washer size to the compatible fastener, then compare material, finish, pack quantity, and whether a single size or an assortment better fits the work at hand.

Visual Guide

Popular examples in this category

1/2-Inch 18-8 Stainless Steel Split Lock Washers, Pack of 1001/2-Inch 18-8 Stainless Steel Split Lock Washers, Pack of 100WBB21008805/16 in. 18-8 Stainless Steel Split Lock Washers, 100-Pack5/16 in. 18-8 Stainless Steel Split Lock Washers, 100-PackWBB3148758No. 6 18-8 Stainless Steel Split Lock Washers, 100-PackNo. 6 18-8 Stainless Steel Split Lock Washers, 100-PackWBB3148786Assorted Carbon Steel Split Lock Washer KitAssorted Carbon Steel Split Lock Washer KitWBB3148726
Use Cases

Support threaded fastening work

Split lock washers are used in maintenance, assembly, bolted connections, and general fastening work where fasteners may rotate or lose friction.

How to Choose

Start with fastener size and material

Select the washer size required by the assembly, such as No. 6, #8, 5/16 in., 3/8 in., 1/2 in., 3/4 in., M6, or M10. Then compare stainless steel, steel, zinc-finished steel, or silicon bronze options.

Applications

Consider vibration and environment

Trapezoidal split designs deflect under load to support locking action. Stainless steel and silicon bronze options are represented for corrosive and marine environments.

Additional Information

Compare packs, kits, and washer pairing

Many listed options come in 100-count packs for repeated work. Selected products can be installed with or without a compatible flat washer, while an assorted kit provides six sizes in a compartmented case.

100Common pack count

Many individual-size options are offered in 100-count packs.

6Sizes in the kit

The assorted carbon steel kit includes six washer sizes.

No. 6 to 3/4 in.Size range represented

Numbered and inch sizes span from No. 6 through 3/4 in.

M6 and M10Metric sizes represented

Metric split lock washer options are available for M6 and M10 applications.

Comparison Guide

Compare Split Lock Washer Options

Use this overview to compare the product types represented in the category before narrowing by required fastener size.

Product TypeMaterials or Finish RepresentedSelection Details
Single-size stainless steel washers18-8 stainless steel or 304 stainless steelAvailable in No. 6, #8, 5/16 in., 3/8 in., 1/2 in., and M10 sizes; listed in 100-count packs.
Single-size steel washersSteel, including clear zinc finish on M6M6 clear zinc option is Class 8.8 and DIN 127B; a 5/16 in. Grade 2 steel option has a hardened bearing surface.
Single-size silicon bronze washersSilicon bronzeAvailable in #8, 1/2 in., and 3/4 in. sizes for corrosive and marine environments; listed in 100-count packs.
Assorted washer kitCarbon steelSix-size assortment in a six-compartment case; washers are described as reusable.
Planning Guide

Plan the right fit before choosing

Match the Washer to the Assembly

Confirm the required size before choosing a pack

The available selection includes inch, numbered, and metric sizes. Choose a washer intended for the compatible threaded fastener in the assembly.

  • Numbered sizes include No. 6, #8, and #8 silicon bronze.
  • Inch sizes include 5/16 in., 3/8 in., 1/2 in., and 3/4 in.
  • Metric choices include M6 and M10.
  • For varied maintenance needs, consider the six-size assorted kit.
Compare Materials and Finishes

Choose for the conditions described by the product

Material is a key point of comparison across the category. 18-8 stainless steel options are described for corrosion and chemical resistance, while silicon bronze options are represented for highly corrosive and marine environments.

  • 18-8 stainless steel is available in several numbered and inch sizes.
  • 304 stainless steel is available in M10.
  • Silicon bronze is available in #8, 1/2 in., and 3/4 in. sizes.
  • Steel options include clear zinc-finished M6 washers and 5/16 in. Grade 2 steel washers.
Plan Installation and Stock

Select quantities and compatible washer arrangements

Most individual-size choices are supplied in 100-count packs for repeated assembly, maintenance, or hardware stock. Some listed stainless steel and silicon bronze designs can be installed with or without a compatible flat washer.

  • A hardened bearing surface is specified on the 5/16 in. Grade 2 steel option for more uniform torque control.
  • The assorted carbon steel kit has six compartments to keep sizes separated.
  • The assorted kit's washers are described as reusable.
  • Split lock designs apply tension or deflect under load to help resist loosening.
FAQ

Common questions before buying

What are split lock washers used for?

They are used with compatible threaded fasteners to help support connections where rotation, reduced friction, vibration, or corrosion may contribute to loosening.

What sizes are available?

Represented sizes include No. 6, #8, 5/16 in., 3/8 in., 1/2 in., 3/4 in., M6, and M10, plus a six-size assorted kit.

Which materials are represented?

The selection includes 18-8 stainless steel, 304 stainless steel, steel, clear zinc-finished steel, carbon steel, and silicon bronze.

Can split lock washers be used with flat washers?

Selected listed stainless steel and silicon bronze options can be installed with or without a compatible flat washer. The assorted kit can be used with or without a hardened flat washer.

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