ASTM F436M Specification
ASTM F436M 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 M12 through M100. Boltport manufactures and stocks full range of type 1 & type 3 steel washers to ASTM F436M specification.
Grade Type
| Grade | Steel Description | Identification Marking |
|---|---|---|
| Type 1 | Hardened Steel | "F436M" |
| Type 3 | Weathering Steel | "F436M 3" |
Chemical Composition [Note A]
| Elements | Composition, % | ||
|---|---|---|---|
| Type 1 | Type 3 [Note B] | ||
| Phosphorus, max | Heat | 0.040 | 0.040 |
| Product | 0.050 | 0.045 | |
| Sulfur, max | Heat | 0.050 | 0.050 |
| Product | 0.060 | 0.055 | |
| Silicon | Heat | -- | 0.15 - 0.35 |
| Product | -- | 0.13 - 0.37 | |
| Chromium | Heat | -- | 0.45 - 0.65 |
| Product | -- | 0.42 - 0.68 | |
| Nickel | Heat | -- | 0.25 - 0.45 |
| Product | -- | 0.22 - 0.48 | |
| Copper | Heat | -- | 0.25 - 0.45 |
| Product | -- | 0.22 - 0.48 | |
Mechanical Properties [Hardness Requirement]
| Surface | Quenched and Tempered | Carburized |
|---|---|---|
| Plain | 38 - 45 HRC | 69 - 73 HRA |
| Hot Dip Galvanized | 26 - 45 HRC | |
| Mechanical Galvanized | 38 - 45 HRC |
Dimensions of Circular Washers
| Nominal Washer Size, mmA |
Inside Diameter (A), mm | Outside Diameter (B), mm | Thickness (C), mm Clipped Width | Clipped Width (E), mm, minB |
|||
|---|---|---|---|---|---|---|---|
| max | min | max | min | max | min | ||
| 12 | 14.4 | 14.0 | 27.0 | 25.7 | 4.6 | 3.1 | 10.5 |
| 14 | 16.4 | 16.0 | 30.0 | 28.7 | 4.6 | 3.1 | 12.2 |
| 16 | 18.4 | 18.0 | 34.0 | 32.4 | 4.6 | 3.1 | 14.0 |
| 20 | 22.5 | 22.0 | 42.0 | 40.4 | 4.6 | 3.1 | 17.5 |
| 22 | 24.5 | 24.0 | 44.0 | 42.4 | 4.6 | 3.4 | 19.2 |
| 24 | 26.5 | 26.0 | 50.0 | 48.4 | 4.6 | 3.4 | 21.0 |
| 27 | 30.5 | 30.0 | 56.0 | 54.1 | 4.6 | 3.4 | 23.6 |
| 30 | 33.6 | 33.0 | 60.0 | 58.1 | 4.6 | 3.4 | 26.2 |
| 36 | 39.6 | 39.0 | 72.0 | 70.1 | 4.6 | 3.4 | 31.5 |
| 42 | 45.6 | 45.0 | 84.0 | 81.8 | 7.2 | 4.6 | 36.7 |
| 48 | 52.7 | 52.0 | 95.0 | 92.8 | 7.2 | 4.6 | 42.0 |
| 56 | 62.7 | 62.0 | 107.0 | 104.8 | 8.7 | 6.1 | 49.0 |
| 64 | 70.7 | 70.0 | 118.0 | 115.9 | 8.7 | 6.1 | 56.0 |
| 72 | 78.7 | 778.0 | 130.0 | 127.5 | 8.7 | 6.1 | 63.0 |
| 80 | 86.9 | 86.0 | 142.0 | 139.5 | 8.7 | 6.1 | 70.0 |
| 90 | 96.9 | 96.0 | 159.0 | 156.5 | 8.7 | 6.1 | 78.7 |
| 100 | 107.9 | 107.0 | 176.0 | 173.5 | 8.7 | 6.1 | 87.5 |
Note :
A : Nominal washer sizes are intended for use with fasteners of the same nominal thread diameter.
B : Washers may be clipped on one side not closer to the center of the washer than width E.