Flat Washer With Square Hole

AYA Fasteners (Hebei) Co., Ltd. is one of the most experienced manufacturers and suppliers of flat washer with square hole in China. Please feel free to buy high quality flat washer with square hole made in China here from our factory. For price consultation, contact us.

 

 

As a global supplier of customized fastening solutions, AYA's service process is also as close to customers as AYA's products. From describing needs to follow-up services, AYA will promptly and spare no effort to help customers solve any fastening problems that arise, to eliminate the concern of customers.

 

Request Custom Dimensions

 

 

Product Name	Flat Washer With Square Hole
Also Named	Round Washer Square Hole
Material	Steel
Vickers Hardness, HV	100 HV( 100HV~250HV)
Standard	DIN 440
Diameter	M5/ M6/ M8/ M10/ M12/ M16/ M20/ M22
Finish	Plain, Black, Zinc Plated, Hot Dipped Galvanized, Oxidation, Dacromet, Phosphating, Cadmium Electroplate, Nickel Plated

 

 

 

 

Nominal Diameter d		M5	M6	M8	M10	M12	M16	M20	M22
a	min=nominal size	5.5	6.6	9	11	14	18	22	24
	max	5.8	6.96	9.36	11.43	14.43	18.7	22.84	24.84
dc	max=nominal size	18	22	28	34	44	56	72	80
	min	16.9	20.7	26.7	32.4	42.4	54.1	70.1	78.1
h	Nominal Size	2	2	3	3	4	5	6	6
	max	2.3	2.3	3.6	3.6	4.6	6	7	7
	min	1.7	1.7	2.4	2.4	3.4	4	5	5
per 1000 units ≈ kg		3.52	5.28	12.6	18.5	41.6	84	169	210

 

 

 

 

 

Square hole flat washers are widely used in structural steel, timber construction, utility systems and heavy equipment where anti-rotation performance and load distribution are critical.

 

AYA manufactures custom square hole flat washers to your exact specifications, including non-standard dimensions, materials, thicknesses and surface finishes, helping engineers achieve a secure fit in demanding applications.

 

Whether you need prototype quantities or high-volume production, our engineering team supports your project from drawing review to final production.

 

Request a Custom Quote

 

 

Standard washers are designed for general applications.

 

However, many industrial projects require customized dimensions, hole sizes, or material grades to ensure proper load distribution and installation performance.

 

AYA provides custom manufacturing services for projects requiring:

 

✓ Non-standard outside dimensions

✓ Custom square hole sizes

✓ Special thicknesses

✓ High-strength steel

✓ Stainless steel

✓ Hot-dip galvanized finish

✓ Zinc flake coating

 

 

• Material Integrity: Carbon Steel (Grades 4.8, 8.8), Stainless Steel (A2, A4), Aluminum, or Exotic Alloys. A full MTR (Material Traceability Report) is available upon request.
• Precision Stamping: Thickness from 0.5 mm to heavy-duty 12 mm with burr-free edge control.
• Surface Treatment: Plain, Zinc Plated, HDG, or Geomet/Dacromet for extreme anti-corrosion requirements in coastal or heavy industrial environments.

 

 

 

1. Every link in the production will be supervised by quality control personnel to ensure that the final product meets customer expectations.

2. Sophisticated testing instruments and experienced quality control personnel can provide customers with more accurate quality inspection reports.

 

 

 

1. The packaging could be customized according to customer needs. And it would be fully reinforced to prevent unexpected damages during the shipment.

2. Mature warehousing and logistics systems and digital tools make goods delivery highly efficient.

 

 

Structural Steel Connections

Ideal for timber connectors and steel framing where square bolts must remain fixed during tightening.

 

Utility & Power Transmission

Used in utility poles, transmission towers and infrastructure projects requiring reliable anti-rotation fastening.

 

Agricultural Equipment

Suitable for heavy-duty machinery operating under vibration and outdoor conditions.

 

Custom Machinery

Designed according to equipment drawings for unique installation requirements.

 

 

 

AYA provides exclusive services to 1000+ members from all over the world every year, with a unique chain service solution system, you only need to click the mouse to get exclusive fastening solutions and enjoy door-to-door services.

 

 

 

Square Hole Washer Description

The square hole washer is thick and wide as compared to the usual round washers. The thickness and width help in distributing heavy loads. 

 

The square shape of the washer also prevents rotations when the washer is placed in a square recess. 

 

These washers are ideal for usage with holding down and coach bolts. 

 

The square hole washer consists of a disc-shaped, flattened, or circular piece of metal in stainless steel or steel, with a square hole in the middle. These washers are used with threaded fasteners. 

 

This product offers many advantages to the user and it is also used for various applications. 

 

Square Hole Washer Advantages 

The primary use of the washer is to distribute the load of the threaded fastener evenly. Usually, the threaded fasteners put stress on the material in which they are being driven. For example, when a worker drives a screw in the wood, it may cause breakage or cracks around the wooden surface. Washers are useful in reducing the risk of such damage by the even distribution of load. Even though a washer is not needed for every material, for softer materials such as wood, washers are very useful in protecting the material from stress-related damage. 

 

The second advantage of square hole washers is they are used for spacing. In case the threaded fastener tends to be longer than the object's depth, it will be difficult to drive it into the object. The fastener may stick out the object's back. A protruded screw tip is the last thing you want. When there is a square hole washer, you get a plausible solution. Placing these washers through the fastener before the user drives it into the object will create the necessary padding so that the fastener does not go in too deep. 

 

The third advantage of square hole washers is liquid protection. They help in preventing the entry of liquids and water. These washers are mostly used in connections and water pipes to create a tight waterproof deal. You would have to choose the material of the washer wisely. We offer square hole washers in different materials and they can be used for a variety of purposes. 

 

With square hole washers, there is enhanced torque distribution as well. 

 

So, overall, square hole washers offer multiple advantages to the user. 

 

Square Hole Washer Applications 

Square hole washers are widely used in plumbing. Whether it is the water or pipeline connection, the presence of a quality square-hole washer is necessary. 

 

Before a screw gets driven into the surface, a washer is placed to evenly distribute the load and provide greater protection. 

 

Square hole washers may be used for different applications such as spacing, load distribution, absorption of vibrations, and liquid protection. 

 

It is essential to purchasing good-quality square hole washers, especially in steel or stainless steel. Choose us to purchase the best-quality square hole washers. 

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