Plain Steel Square Washer

The Plain Steel Square Washer produced by the Xiaoguo® factory have strong versatility and can perfectly fit the square tail of the head bolts, achieving 100% coverage of the stressed area.

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Product Description

How are Plain Steel Square Washer produced? We will show you the entire production process, from steel strip feeding to finished product delivery. You can learn more.

（1）Raw material preparation

Determine the material for the production of the washer and select the corresponding steel coil.

Plain Steel Square Washer

（2）Precision stamping

The steel coil is fed into a high-speed precision stamping machine. Each process will produce a finished washer:

Guiding holes: Drill positioning holes in the steel sheet to ensure precise alignment of each subsequent workstation position.

Center hole: The central circular hole of the Plain Steel Square Washer, formed by the precision punch.

Pre-forming and stamping: The surrounding area around the central hole is subjected to compression and "stamping" to strengthen the metal and form a smooth and flat bearing surface.

Shape cutting: The punch cuts out a square shape.

Waste cutting and part ejection: The remaining steel strips are automatically cut, and the finished gaskets are sent into the collection box.

（3）Edge smoothing processing

The pressed Plain Steel Square Washer has sharp edges and tiny burrs. The burrs on the washer are removed by vibration. After processing, the edges of the washer are smooth, the operation is safe, and it will not scratch the surface of the workpiece.

（4）Heat treatment (high-strength gasket)

Standard ordinary washer do not undergo heat treatment. However, for hardened high-strength washer, the following heat treatment process will be carried out:

Insert the Plain Steel Square Washer into the mesh belt furnace and heat it to the austenitization temperature.

Cool rapidly in oil or water.

Then it was heated again to achieve a balance between strength and toughness.

Plain Steel Square Washer

Mon	φ6	φ8	φ10	φ12	φ14	φ16	φ18	φ20	φ22	φ24	φ27
d max	7.2	9.6	11.7	14.7	16.7	18.7	20.8	22.8	24.8	26.8	30.8
d min	6.6	9	11	14	16	18	20	22	24	26	30
s max	17	23	28	35	40	45	52	56	64	68	73
s min	15.9	21.7	26.7	33.4	38.4	43.4	50.1	54.1	62.1	66.1	71.1
h max	14	1.8	1.8	2.6	3.6	3.6	5	5	5	6.7	6.7
h min	1	14	1.4	2	2.8	2.8	4	4	4	5.3	5.3

（5）Surface treatment and rust prevention

Based on the level of rust prevention the customer desires, select the appropriate surface treatment method. The specific situation will be determined based on actual usage.

（6）Quality Control

The chemical composition and mechanical properties of each coil of steel strip need to be verified.

After the mold is debugged and before the mass production begins, a comprehensive size inspection of the first batch of Plain Steel Square Washer is conducted.

Quality inspectors conduct random inspections of key dimensions every hour.

Final shipment inspection: Before batch packaging, according to the sampling standards, the thickness, inner and outer diameters, hardness and coating adhesion will be tested.