Prime-Line Flat Washers, 1/2 in.

If you need a wider bearing surface around a screw or bolt, a flat washer is a straightforward way to spread contact over more area. This Prime-Line set comes in zinc-plated steel, with a 1/2-inch inner size and a 1-3/8-inch outside diameter.

It also has a simple secondary use: washers can act as spacers when stacked, or help keep a fastener from passing too far into a hole.

Getting the most from it

Use a washer where the fastener would otherwise bear directly against the material around a hole. For example, when tightening a bolt through a panel, the washer sits beneath the head or nut and distributes the contact over a wider area. Its outside diameter is the key dimension for that coverage, while the 1/2-inch size needs to suit the fastener being used.

The same washers can be stacked to create a spacer, as the product description notes. That can help when you need to adjust the stand-off between parts, though stacking washers is a simple workaround rather than a substitute for a spacer made for a specific application. The zinc-plated steel construction and USS designation are useful details when matching the part to a project, they do not, by themselves, establish that it is right for every environment or load.

Why it’s worth it

The practical appeal is versatility: one washer can spread load around a fastener, limit how far a screw or bolt enters a hole, or serve as a spacer. The 50-pack is suited to having multiple washers available for a project instead of buying only what is needed for a single fastening point.

If you prioritize a general-purpose washer for common fastening tasks, this size gives you a broad outside diameter relative to its inner size. If you prefer a purpose-built spacer or a washer chosen for a specified application, a generic flat washer may not provide the dimensions or documented performance you need. It’s a great fit if the listed size matches your fastener and the parts being joined. It may not suit you if the project depends on a particular load rating or other requirements not provided here.

At a glance

• Type: USS flat washers
• Size: 1/2 inch x 1-3/8 inch outside diameter
• Material: Zinc-plated steel
• Pack: 50

The description calls these a commonly used, versatile washer and identifies load distribution, limiting fastener travel into a hole, and stacking for spacing as intended uses. On the spec sheet, the dimensions and material are clear, details such as thickness and a load rating are not listed, so don’t assume those for a demanding or tightly specified job.

Buying verdict

Choose these Prime-Line washers when you want a 50-pack of zinc-plated steel flat washers and the 1/2-inch size with 1-3/8-inch outside diameter fits your hardware and application. They make sense for general fastening, spreading contact, and simple spacing. If a project calls for a precise thickness, rated capacity, or environmental specification, look for a washer whose listing provides that information rather than relying on size and finish alone.