FLAT WASHER
BS 4320
Steel Hardness: 100HV
Finish: Self, Black, Bright Zinc, Hot Dip Galvanized
Dimensions
| Nominal Washer Size | Inside Diameter (ID) | Outside Diameter (OD) | Thickness (s) | |||||||
| Min. | Max. | Min. | Max. | FORM A | FORM B | |||||
| Nom. | Max. | Min. | Nom. | Max. | Min. | |||||
| M3 | 3.2 | 3.4 | 6.7 | 7 | 0.5 | 0.6 | 0.4 | – | – | – |
| M4 | 4.3 | 4.5 | 8.7 | 9 | 0.8 | 0.9 | 0.7 | – | – | – |
| M5 | 5.3 | 5.5 | 9.7 | 10 | 1 | 1.1 | 0.9 | – | – | – |
| M6 | 6.4 | 6.7 | 12.1 | 12.5 | 1.6 | 1.8 | 1.4 | 0.8 | 0.9 | 0.7 |
| M8 | 8.4 | 8.7 | 16.6 | 17 | 1.6 | 1.8 | 1.4 | 1 | 1.1 | 0.9 |
| M10 | 10.5 | 10.9 | 20.5 | 21 | 2 | 2.2 | 1.8 | 1.25 | 1.45 | 1.05 |
| M12 | 13 | 13.4 | 23.5 | 24 | 2.5 | 2.7 | 2.3 | 1.6 | 1.8 | 1.4 |
| (M14) | 15 | 15.4 | 27.5 | 28 | 2.5 | 2.7 | 2.3 | 1.6 | 1.8 | 1.4 |
| M16 | 17 | 17.4 | 29.5 | 30 | 3 | 3.3 | 2.7 | 2 | 2.2 | 1.8 |
| (M18) | 19 | 19.5 | 33.2 | 34 | 3 | 3.3 | 2.7 | 2 | 2.2 | 1.8 |
| M20 | 21 | 21.5 | 36.2 | 37 | 3 | 3.3 | 2.7 | 2 | 2.2 | 1.8 |
| (M22) | 23 | 23.5 | 38.2 | 39 | 3 | 3.3 | 2.7 | 2 | 2.2 | 1.8 |
| M24 | 25 | 25.5 | 43.2 | 44 | 4 | 4.3 | 3.7 | 2.5 | 2.7 | 2.3 |
| (M27) | 28 | 28.5 | 49.2 | 50 | 4 | 4.3 | 3.7 | 2.5 | 2.7 | 2.3 |
| M30 | 31 | 31.6 | 55 | 56 | 4 | 4.3 | 3.7 | 2.5 | 2.7 | 2.3 |
| (M33) | 34 | 34.6 | 59 | 60 | 5 | 5.6 | 4.4 | 3 | 3.3 | 2.7 |
| M36 | 37 | 37.6 | 65 | 66 | 5 | 5.6 | 4.4 | 3 | 3.3 | 2.7 |
| (M39) | 40 | 40.6 | 71 | 72 | 6 | 6.6 | 5.4 | 3 | 3.3 | 2.7 |
| Nominal Washer Size | Inside Diameter (ID) | Outside Diameter (OD) | Thickness (s) | |||||||
| Min. | Max. | Min. | Max. | FORM C | FORM D | |||||
| Nom. | Max. | Min. | Nom. | Max. | Min. | |||||
| M4 | 4.3 | 4.5 | 9.7 | 10 | 0.8 | 0.9 | 0.7 | – | – | – |
| M5 | 5.3 | 5.5 | 12.1 | 12.5 | 1 | 1.1 | 0.9 | – | – | – |
| M6 | 6.4 | 6.7 | 13.6 | 14 | 1.6 | 1.8 | 1.4 | 0.8 | 0.9 | 0.7 |
| M8 | 8.4 | 8.7 | 20.5 | 21 | 1.6 | 1.8 | 1.4 | 1 | 1.1 | 0.9 |
| M10 | 10.5 | 10.9 | 23.5 | 24 | 2 | 2.2 | 1.8 | 1.25 | 1.45 | 1.05 |
| M12 | 13 | 13.4 | 27.5 | 28 | 2.5 | 2.7 | 2.3 | 1.6 | 1.8 | 1.4 |
| (M14) | 15 | 15.4 | 29.5 | 30 | 2.5 | 2.7 | 2.3 | 1.6 | 1.8 | 1.4 |
| M16 | 17 | 17.4 | 33.2 | 34 | 3 | 3.3 | 2.7 | 2 | 2.2 | 1.8 |
| (M18) | 19 | 19.5 | 36.2 | 37 | 3 | 3.3 | 2.7 | 2 | 2.2 | 1.8 |
| M20 | 21 | 21.5 | 38.2 | 39 | 3 | 3.3 | 2.7 | 2 | 2.2 | 1.8 |
| (M22) | 23 | 23.5 | 43.2 | 44 | 3 | 3.3 | 2.7 | 2 | 2.2 | 1.8 |
| M24 | 25 | 25.5 | 49.2 | 50 | 4 | 4.3 | 3.7 | 2.5 | 2.7 | 2.3 |
| (M27) | 28 | 28.5 | 55 | 56 | 4 | 4.3 | 3.7 | 2.5 | 2.7 | 2.3 |
| M30 | 31 | 31.6 | 59 | 60 | 4 | 4.3 | 3.7 | 2.5 | 2.7 | 2.3 |
| (M33) | 31 | 31.6 | 65 | 66 | 5 | 5.6 | 4.4 | 3 | 3.3 | 2.7 |
| M36 | 37 | 37.6 | 71 | 72 | 5 | 5.6 | 4.4 | 3 | 3.3 | 2.7 |
| (M39) | 40 | 40.6 | 76 | 77 | 6 | 6.6 | 5.4 | 3 | 3.3 | 2.7 |
| Nominal Washer Size | Inside Diameter (ID) | Outside Diameter (OD) | Thickness (s) | ||||
| Min. | Max. | Min. | Max. | FORM F | |||
| Nom. | Max. | Min. | |||||
| M8 | 9 | 9.4 | 20.2 | 21 | 1.6 | 1.9 | 1.3 |
| M10 | 11 | 11.5 | 23.2 | 24 | 2 | 2.3 | 1.7 |
| M12 | 14 | 14.5 | 27.2 | 28 | 2.5 | 2.8 | 2.2 |
| (M14) | 16 | 16.5 | 29.2 | 30 | 2.5 | 2.8 | 2.2 |
| M16 | 18 | 18.5 | 32.8 | 34 | 3 | 3.6 | 2.4 |
| (M18) | 20 | 20.6 | 35.8 | 37 | 3 | 3.6 | 2.4 |
| M20 | 22 | 22.6 | 37.8 | 39 | 3 | 3.6 | 2.4 |
| (M22) | 24 | 24.6 | 42.8 | 44 | 3 | 3.6 | 2.4 |
| M24 | 26 | 26.6 | 48.8 | 50 | 4 | 4.6 | 3.4 |
| (M27) | 30 | 30.6 | 54.5 | 56 | 4 | 4.6 | 3.4 |
| M30 | 33 | 33.8 | 58.5 | 60 | 4 | 4.6 | 3.4 |
| (M33) | 36 | 36.8 | 64.5 | 66 | 5 | 6 | 4 |
| M36 | 39 | 39.8 | 70.5 | 72 | 5 | 6 | 4 |
| (M39) | 42 | 42.8 | 75.5 | 77 | 6 | 7 | 5 |
| Nominal Washer Size | Inside Diameter (ID) | Outside Diameter (OD) | Thickness (s) | ||||
| Min. | Max. | Min. | Max. | FORM G | |||
| Nom. | Max. | Min. | |||||
| M5 | 5.5 | 5.8 | 14.2 | 15 | 1.6 | 1.9 | 1.3 |
| M6 | 6.6 | 7 | 17.2 | 18 | 2 | 2.3 | 1.7 |
| M8 | 9 | 9.4 | 23.2 | 24 | 2 | 2.3 | 1.7 |
| M10 | 11 | 11.5 | 29.2 | 30 | 2.5 | 2.8 | 2.2 |
| M12 | 14 | 14.5 | 34.8 | 36 | 3 | 3.6 | 2.4 |
| (M14) | 16 | 16.5 | 40.8 | 42 | 3 | 3.6 | 2.4 |
| M16 | 18 | 18.5 | 46.8 | 48 | 4 | 4.6 | 3.8 |
| (M18) | 20 | 20.6 | 52.5 | 54 | 4 | 4.6 | 3.4 |
| M20 | 22 | 22.6 | 58.5 | 60 | 5 | 6 | 4 |
| (M22) | 24 | 24.6 | 64.5 | 66 | 5 | 6 | 4 |
| M24 | 26 | 26.6 | 70.5 | 72 | 6 | 7 | 5 |
| (M27) | 30 | 30.6 | 79 | 81 | 6 | 7 | 5 |
| M30 | 33 | 33.8 | 88 | 90 | 8 | 9.2 | 6.8 |
| (M33) | 36 | 36.8 | 97 | 99 | 8 | 9.2 | 6.8 |
| M36 | 39 | 39.8 | 106 | 108 | 10 | 11.2 | 8.8 |
| (M39) | 42 | 42.8 | 115 | 117 | 10 | 11.2 | 8.8 |