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ASTM F436 covers the chemical and mechanical requirements for hardened washers in diameters ranging from 1/4″ to 4″ inclusive. These heat treated washers are for general purpose and structural use and are suitable for use with A325 and A490 structural bolts. Additionally, they are used with bolts per A449, A354, A193, A320, F1554 and whenever specified.

F436 Types

Type 1Carbon Steel
Type 3Weathering Steel

F436 Styles

CircularRound SAE patternSizes 1/4" through 4"
BeveledBeveled Slope 2 in 12 or 9.5 degrees for use with American standard beamsSizes 1/2" through 1-1/2"
ClippedCircular or BeveledSizes 1/2" through 1-1/2" beveled, 1/4" through 4" circular
Beveled F436 washers are normally not available above 1". Clipped bevel washers are only usually available as specials.

F436 Mechanical Properties

Plain Finish Hot Dip Galvanized
Rockwell Hardness 38 to 45 HRCRockwell Hardness 26 to 45 HRC

F436 Chemical Requirements

Element Type 1 Type 3
Phosphorous, max0.040%0.040%
Sulfur, max0.050%0.050%
Silicon-0.15 - 0.35%
Chromium-0.45 - 0.65%
Nickel-0.25 - 0.45%
Copper-0.25 - 0.45%
Weathering steel washer may also be made from any of the steels listed in Table 2 of A325.

F436 Flat Washers

F436 flat washers are manufactured from carbon steel to meet or exceed ASTM F436. Zinc plated material will meet or exceed ASTM F1941. Hot-Dip Galvanized material will meet or exceed ASTM A153 and/or ASTM F2329. Hardness for plain and zinc plated washers is HRC 38-45 and HRC 26-45 for hot-dip galvanized washers per ASTM F436.

F436 Flat Washers
Bolt SizeOutside Diameter
Inside DiameterThickness

Astm F436 Washer Application Industries

Sunflex Metal Industries are engaged in manufacturing of robust quality of Astm F436 Washer. These Astm F436 Washer are widely used in the following industries:

Astm F436 Washer Mining Industries
Astm F436 Washer Transport Industries- Rail and Road
Astm F436 Washer Construction Industries / Building Systems
Astm F436 Washer Manufacturing Industries
Astm F436 Washer Agriculture Industries
Astm F436 Washer Energy Industries
Astm F436 Washer Water Industries
Astm F436 Washer Automotive Industries
Astm F436 Washer Ship Building Industries
Astm F436 Washer Nuclear Power Plant
Astm F436 Washer Paper & Pulp Industries
Astm F436 Washer Sugar Industries
Astm F436 Washer Engineering Cement Industries
Astm F436 Washer Petro-Chemical Industries
Astm F436 Washer Food Industries
Astm F436 Washer Oil & Gas Industries
Astm F436 Washer Chemical & Pharmaceutical Industries

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