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| ASTM F436 Structural Washers Specification-NINGBO BOLT |
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| ASTM F436M Hardened Structural Washers |
ASTM F436 Structural Washers Specification
ASTM F436 is a standard material and dimensional specification for hardened steel washers, intended for general-purpose mechanical and structural use with bolts, nuts, studs, and other internally and externally threaded fasteners. This specification covers chemical, mechanical and dimensional requirements for both type 1 & type 3 hardened steel washers for use with fasteners having nominal thread diameters of 1/4 through 4 inch. Boltport manufactures and stocks full range of type 1 & type 3 steel washers to ASTM F436 specification.
Grade Type
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Grade |
Steel Description |
Identification Marking |
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Type 1 |
Hardened Steel |
"F436" |
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Type 3 |
Weathering Steel |
"F436 3" |
Chemical Composition
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Elements |
Composition, % |
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Type 1 |
Type 3 [Note B] |
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Phosphorus, max |
Heat |
0.040 |
0.040 |
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Product |
0.050 |
0.045 |
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Sulfur, max |
Heat |
0.050 |
0.050 |
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Product |
0.060 |
0.055 |
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Silicon |
Heat |
-- |
0.15 - 0.35 |
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Product |
-- |
0.13 - 0.37 |
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Chromium |
Heat |
-- |
0.45 - 0.65 |
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Product |
-- |
0.42 - 0.68 |
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Nickel |
Heat |
-- |
0.25 - 0.45 |
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Product |
-- |
0.22 - 0.48 |
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Copper |
Heat |
-- |
0.25 - 0.45 |
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Product |
-- |
0.22 - 0.48 |
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Mechanical Properties [Hardness Requirement]
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Surface |
Through Hardened |
Carburized |
Carburized and Hardened |
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Plain |
38 - 45 HRC |
69 - 73 HRA |
30 HRC or 65 HRA |
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Hot Dip Galvanized |
26 - 45 HRC |
79 - 83 HR15N |
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