Square Washer With Round Hole
Specification
Square Washers with Round Holes
A square washer provides a plate-style bearing surface beneath a bolt head or nut, while its central round hole allows the fastener to pass through. As a square washer manufacturer, PO JUN offers this configuration for brackets, mounting plates, timber connections, and fabricated assemblies.
The square outline is useful where the joint design calls for a wider bearing footprint or a washer that fits within a rectangular mounting area. Selecting the right hole size, outside dimensions, and thickness helps match the washer to both the fastener and the supporting component.
A Square Bearing Surface Around a Round Fastener
Plate-Style Contact Area
The washer separates the bolt head or nut from the assembly surface and distributes the bearing contact over its footprint. It can be considered for larger clearance holes or slotted connections, provided the washer dimensions and thickness are suitable for the opening and load.
Straight Edges for Mounting Layouts
The square profile can align with plate edges, brackets, or purpose-designed recesses. Check the corner clearance when the washer sits near a bend, weld, or adjacent component.
Round Clearance Hole
The center hole accommodates a bolt or threaded rod without engaging its threads. The opening must provide sufficient clearance while leaving enough bearing area beneath the fastener.
Available Sizes
Listed as inner diameter / outside size / thickness:
| Inner Diameter | Outside Size | Thickness |
|---|---|---|
| 3/8" | 32 mm | 2 mm |
| 1/2" | 40 mm | 3 mm |
| 5/8" | 50 mm | 3 mm |
| 3/4" | 60 mm | 3 mm |
The catalog labels the outside dimension as “outside diameter.” For this square profile, confirm the side dimensions and actual hole clearance on the order drawing before selecting the washer for a restricted mounting space.
Applications in Fabrication and Assembly
Square washers with round holes can be evaluated for joints where a plate-shaped washer suits the mounting surface.
- Metal brackets and mounting plates: Provide a bearing interface around the fastening hole, with dimensions selected to cover the opening.
- Timber connections: Spread contact beneath a bolt head or nut where the timber condition and joint design call for a larger washer footprint.
- Slotted adjustment points: Cover the slot at the selected bolt position, subject to adequate thickness and support around the opening.
- Equipment bases and fabricated frames: Fit rectangular mounting areas where washer width, corner clearance, and bolt access must work together.
A larger washer is not automatically a stronger one. Thickness, material hardness, unsupported span, and the supporting surface all influence deformation under tightening load.
Choose the Material Around the Environment
Material and finish should reflect how the finished assembly will be used. Steel and stainless steel have different selection considerations, while zinc plating is a surface finish rather than a separate base material.
For indoor fabricated equipment, buyers may prioritize dimensional fit and finish compatibility. Outdoor or damp installations require closer attention to corrosion exposure and contact with other metals. Include your required grade and finish in the inquiry so availability can be reviewed for the selected size.
If the washer will contact painted, plated, or decorative surfaces, specify any edge, burr, or appearance requirements. A metal washer does not guarantee a mark-free surface after tightening.
Source Square Washers for Your Next Order
When choosing a square washer supplier, provide the dimensions that control your assembly rather than only the bolt size. PO JUN welcomes inquiries with the required hole diameter, outside dimensions, thickness, material, and quantity.
Attach a drawing or sample reference if you are matching an existing part. For repeat production orders, include the destination country, requested delivery date, and any packaging, labeling, or inspection-document needs.
Send your size list or mounting drawing to discuss the square washers for your application.
Frequently Asked Questions
Is a square washer the same as a square nut?
No. A square washer has an unthreaded clearance hole and provides a bearing or spacing surface. A square nut has an internal thread that engages the bolt.
Can a square washer prevent a bolt from loosening?
A plain square washer is not a locking device. If the joint is exposed to vibration or repeated loading, use a fastening arrangement validated for those conditions.
Can these washers be used as precision spacers?
Only if their thickness tolerance and flatness meet the spacing requirement. General washer dimensions should not be assumed to provide precision shim performance.
Can a square washer replace a round washer?
It may be possible after checking the hole size, thickness, material, bearing footprint, and corner clearance. Match the joint requirements rather than replacing solely by nominal bolt size.