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BS 4320

bs-4320

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

All data for information purpose only. For more details on product standards or dimensions, please feel free to contact us at export@fnfindia.com

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