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ASTM F436

Scope

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.

Types

Type 1 Carbon Steel
Type 3 Weathering Steel

Styles

Circular Round SAE pattern Sizes 1/4" through 4"
Beveled Beveled Slope 2 in 12 or 9.5 degrees for use with American standard beams Sizes 1/2" through 1-1/2"
Clipped Circular or Beveled Sizes 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.

Mechanical Properties

Plain FinishHot Dip Galvanized
Rockwell Hardness 38 to 45 HRC Rockwell Hardness 26 to 45 HRC

Chemical Requirements

ElementType 1Type 3
Phosphorous, max 0.040% 0.040%
Sulfur, max 0.050% 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.