Kunshan Zhonggu Precision Hardware Co., Ltd.

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Kunshan Zhonggu Precision Hardware Co., Ltd.

 [Jiangsu,China]

Business Type:Manufacturer

Main Markets: Americas , East Europe , Europe , Middle East , North Europe , Oceania , West Europe

Exporter:21% - 30%

Certs:ISO9001, CE

Home> Industry Information> ASTM F436M metric series hardened steel flat washers technical requirements

ASTM F436M metric series hardened steel flat washers technical requirements

August 18, 2021

First, the scope of application

Second, the type of gasket material and the type of gasket


     Fourth, mechanical properties

(1) The hardness of the quenched and tempered steel Washer is 38 to 45 HRC. The hardness of the hot-dip galvanized gasket is 26 to 45 HRC.

(2) The depth of the carburized layer of the carburizing gasket should be ≥0.40 mm. The hardness is 69 to 73 HRA.

(3) Mechanically galvanized gaskets shall have the same surface hardness.

V. Number of test samples


Sixth, supplementary requirements

Surface roughness: The gasket should be treated with various measures to make the surface rough no more than 19μm, including any cracks on the surface; the height of the burr should not exceed 0.25mm.

Third, materials and processing

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