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Specifications

ASTM F436

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 1 Carbon Steel
Type 3 Weathering Steel

F436 Styles

Circular Round SAE pattern Sizes 1/4" through 4"

F436 Mechanical Properties

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

F436 Chemical Requirements

Element Type 1 Type 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 F3125.