PETROCHEMICAL
Plating & Coatings
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Washers
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Pipe Supports
U-Bolts
Pipe Clamps
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Hemispherical Washers
Hex Connecting Nut
I-Rod / Nu-Bolts
PLAIN WASHERS (METRIC)
BS4320 FORMS A, B, C & D
| DIA | D1 (NOM) | FORM A D2 (NOM) | FORM A T (NOM) | FORM B D2 (NOM) | FORM B T (NOM) | FORM C D2 (NOM) | FORM C T (NOM) | FORM D D2 (NOM) | FORM D T (NOM) |
|---|---|---|---|---|---|---|---|---|---|
| M3 | 3.2 | 7.0 | 0.5 | 7.0 | - | - | - | - | - |
| M4 | 4.3 | 9.0 | 0.8 | 9.0 | - | 10.0 | 0.8 | 10.0 | - |
| M5 | 5.3 | 10.0 | 1.0 | 10.0 | - | 12.5 | 1.0 | 12.5 | - |
| M6 | 6.4 | 12.5 | 1.6 | 12.5 | 0.8 | 14.0 | 1.6 | 14.0 | 0.8 |
| M8 | 8.4 | 17.0 | 1.6 | 17.0 | 1.0 | 21.0 | 1.6 | 21.0 | 1.0 |
| M10 | 10.5 | 21.0 | 2.0 | 21.0 | 1.25 | 24.0 | 2.0 | 24.0 | 1.25 |
| M12 | 13.0 | 24.0 | 2.5 | 24.0 | 1.6 | 28.0 | 2.5 | 28.0 | 1.6 |
| M14 | 15.0 | 28.0 | 2.5 | 28.0 | 1.6 | 30.0 | 2.5 | 30.0 | 1.6 |
| M16 | 17.0 | 30.0 | 3.0 | 30.0 | 2.0 | 34.0 | 3.0 | 34.0 | 2.0 |
| M18 | 19.0 | 34.0 | 3.0 | 34.0 | 2.0 | 37.0 | 3.0 | 37.0 | 2.0 |
| M20 | 21.0 | 37.0 | 3.0 | 37.0 | 2.0 | 39.0 | 3.0 | 39.0 | 2.0 |
| M22 | 23.0 | 39.0 | 3.0 | 39.0 | 2.0 | 44.0 | 3.0 | 44.0 | 2.0 |
| M24 | 25.0 | 44.0 | 4.0 | 44.0 | 2.5 | 50.0 | 4.0 | 50.0 | 2.5 |
| M27 | 28.0 | 50.0 | 4.0 | 50.0 | 2.5 | 56.0 | 4.0 | 56.0 | 2.5 |
| M30 | 31.0 | 56.0 | 4.0 | 56.0 | 2.5 | 60.0 | 4.0 | 60.0 | 2.5 |
| M33 | 34.0 | 60.0 | 5.0 | 60.0 | 3.0 | 66.0 | 5.0 | 66.0 | 3.0 |
| M36 | 37.0 | 66.0 | 5.0 | 66.0 | 3.0 | 72.0 | 5.0 | 72.0 | 3.0 |
| M39 | 40.0 | 72.0 | 6.0 | 72.0 | 3.0 | 77.0 | 6.0 | 77.0 | 3.0 |
DIA
M3
D1 (Nom)3.2
Form A D27.0
Form A T0.5
Form B D27.0
Form B T-
Form C D2-
Form C T-
Form D D2-
Form D T-
M4
D1 (Nom)4.3
Form A D29.0
Form A T0.8
Form B D29.0
Form B T-
Form C D210.0
Form C T0.8
Form D D210.0
Form D T-
M5
D1 (Nom)5.3
Form A D210.0
Form A T1.0
Form B D210.0
Form B T-
Form C D212.5
Form C T1.0
Form D D212.5
Form D T-
M6
D1 (Nom)6.4
Form A D212.5
Form A T1.6
Form B D212.5
Form B T0.8
Form C D214.0
Form C T1.6
Form D D214.0
Form D T0.8
M8
D1 (Nom)8.4
Form A D217.0
Form A T1.6
Form B D217.0
Form B T1.0
Form C D221.0
Form C T1.6
Form D D221.0
Form D T1.0
M10
D1 (Nom)10.5
Form A D221.0
Form A T2.0
Form B D221.0
Form B T1.25
Form C D224.0
Form C T2.0
Form D D224.0
Form D T1.25
M12
D1 (Nom)13.0
Form A D224.0
Form A T2.5
Form B D224.0
Form B T1.6
Form C D228.0
Form C T2.5
Form D D228.0
Form D T1.6
M14
D1 (Nom)15.0
Form A D228.0
Form A T2.5
Form B D228.0
Form B T1.6
Form C D230.0
Form C T2.5
Form D D230.0
Form D T1.6
M16
D1 (Nom)17.0
Form A D230.0
Form A T3.0
Form B D230.0
Form B T2.0
Form C D234.0
Form C T3.0
Form D D234.0
Form D T2.0
M18
D1 (Nom)19.0
Form A D234.0
Form A T3.0
Form B D234.0
Form B T2.0
Form C D237.0
Form C T3.0
Form D D237.0
Form D T2.0
M20
D1 (Nom)21.0
Form A D237.0
Form A T3.0
Form B D237.0
Form B T2.0
Form C D239.0
Form C T3.0
Form D D239.0
Form D T2.0
M22
D1 (Nom)23.0
Form A D239.0
Form A T3.0
Form B D239.0
Form B T2.0
Form C D244.0
Form C T3.0
Form D D244.0
Form D T2.0
M24
D1 (Nom)25.0
Form A D244.0
Form A T4.0
Form B D244.0
Form B T2.5
Form C D250.0
Form C T4.0
Form D D250.0
Form D T2.5
M27
D1 (Nom)28.0
Form A D250.0
Form A T4.0
Form B D250.0
Form B T2.5
Form C D256.0
Form C T4.0
Form D D256.0
Form D T2.5
M30
D1 (Nom)31.0
Form A D256.0
Form A T4.0
Form B D256.0
Form B T2.5
Form C D260.0
Form C T4.0
Form D D260.0
Form D T2.5
M33
D1 (Nom)34.0
Form A D260.0
Form A T5.0
Form B D260.0
Form B T3.0
Form C D266.0
Form C T5.0
Form D D266.0
Form D T3.0
M36
D1 (Nom)37.0
Form A D266.0
Form A T5.0
Form B D266.0
Form B T3.0
Form C D272.0
Form C T5.0
Form D D272.0
Form D T3.0
M39
D1 (Nom)40.0
Form A D272.0
Form A T6.0
Form B D272.0
Form B T3.0
Form C D277.0
Form C T6.0
Form D D277.0
Form D T3.0
Dimensions in millimetres
Available in Mild Steel and A2 & A4 Stainless Steel
Other materials manufactured on request
PLAIN WASHERS (METRIC)
BS4320 FORMS E, F & G
| DIA | D1 (NOM) | FORM E D2 (NOM) | FORM E T (NOM) | FORM F D2 (NOM) | FORM F T (NOM) | FORM G D2 (NOM) | FORM G T (NOM) |
|---|---|---|---|---|---|---|---|
| M5 | 5.5 | - | - | - | - | - | - |
| M6 | 6.6 | 12.5 | 1.6 | - | - | 18.0 | 2.0 |
| M8 | 9.0 | 17.0 | 1.6 | 21.0 | 1.6 | 24.0 | 2.0 |
| M10 | 11.0 | 21.0 | 2.0 | 24.0 | 2.0 | 30.0 | 2.5 |
| M12 | 14.0 | 24.0 | 2.5 | 28.0 | 2.5 | 36.0 | 3.0 |
| M14 | 16.0 | 28.0 | 2.5 | 30.0 | 2.5 | 42.0 | 3.0 |
| M16 | 18.0 | 30.0 | 3.0 | 34.0 | 3.0 | 48.0 | 4.0 |
| M18 | 20.0 | 34.0 | 3.0 | 37.0 | 3.0 | 54.0 | 4.0 |
| M20 | 22.0 | 37.0 | 3.0 | 39.0 | 3.0 | 60.0 | 5.0 |
| M22 | 24.0 | 39.0 | 3.0 | 44.0 | 3.0 | 66.0 | 5.0 |
| M24 | 26.0 | 44.0 | 4.0 | 50.0 | 4.0 | 72.0 | 6.0 |
| M27 | 30.0 | 50.0 | 4.0 | 56.0 | 4.0 | 81.0 | 6.0 |
| M30 | 33.0 | 56.0 | 4.0 | 60.0 | 4.0 | 90.0 | 8.0 |
| M33 | 36.0 | 60.0 | 5.0 | 66.0 | 5.0 | 99.0 | 8.0 |
| M36 | 39.0 | 66.0 | 5.0 | 72.0 | 5.0 | 108.0 | 10.0 |
| M39 | 42.0 | 72.0 | 6.0 | 77.0 | 6.0 | 117.0 | 10.0 |
DIA
M5
D1 (Nom)5.5
Form E D2-
Form E T-
Form F D2-
Form F T-
Form G D2-
Form G T-
M6
D1 (Nom)6.6
Form E D212.5
Form E T1.6
Form F D2-
Form F T-
Form G D218.0
Form G T2.0
M8
D1 (Nom)9.0
Form E D217.0
Form E T1.6
Form F D221.0
Form F T1.6
Form G D224.0
Form G T2.0
M10
D1 (Nom)11.0
Form E D221.0
Form E T2.0
Form F D224.0
Form F T2.0
Form G D230.0
Form G T2.5
M12
D1 (Nom)14.0
Form E D224.0
Form E T2.5
Form F D228.0
Form F T2.5
Form G D236.0
Form G T3.0
M14
D1 (Nom)16.0
Form E D228.0
Form E T2.5
Form F D230.0
Form F T2.5
Form G D242.0
Form G T3.0
M16
D1 (Nom)18.0
Form E D230.0
Form E T3.0
Form F D234.0
Form F T3.0
Form G D248.0
Form G T4.0
M18
D1 (Nom)20.0
Form E D234.0
Form E T3.0
Form F D237.0
Form F T3.0
Form G D254.0
Form G T4.0
M20
D1 (Nom)22.0
Form E D237.0
Form E T3.0
Form F D239.0
Form F T3.0
Form G D260.0
Form G T5.0
M22
D1 (Nom)24.0
Form E D239.0
Form E T3.0
Form F D244.0
Form F T3.0
Form G D266.0
Form G T5.0
M24
D1 (Nom)26.0
Form E D244.0
Form E T4.0
Form F D250.0
Form F T4.0
Form G D272.0
Form G T6.0
M27
D1 (Nom)30.0
Form E D250.0
Form E T4.0
Form F D256.0
Form F T4.0
Form G D281.0
Form G T6.0
M30
D1 (Nom)33.0
Form E D256.0
Form E T4.0
Form F D260.0
Form F T4.0
Form G D290.0
Form G T8.0
M33
D1 (Nom)36.0
Form E D260.0
Form E T5.0
Form F D266.0
Form F T5.0
Form G D299.0
Form G T8.0
M36
D1 (Nom)39.0
Form E D266.0
Form E T5.0
Form F D272.0
Form F T5.0
Form G D2108.0
Form G T10.0
M39
D1 (Nom)42.0
Form E D272.0
Form E T6.0
Form F D277.0
Form F T6.0
Form G D2117.0
Form G T10.0
Dimensions in millimetres
Available in Mild Steel and A2 & A4 Stainless Steel
Other materials manufactured on request