BS 4882

ASTM A193 Grade B7 Specifications

Dimensions for metric double end studs

Dimensions for metric double end studs
Nominal Size Minimum Thread Length, B min Nominal Length, LT
Diameter, D Pitch, P L T ≤ 250 250 < L T ≤ 400 L T > 400 U max = 2P Range Increments
M6 1 18 24 ... 2 50-90 5
100-160 10
M8 1.25 18 24 ... 2.5 50-90 5
100-160 10
≥ 180 20
M10 1.5 26 32 45 3 60-160 10
≥ 180 20
M12 1.75 30 36 49 3.5 60-160 10
≥ 180 20
M14 2 34 40 53 4 80-160 10
≥ 180 20
M16 2 38 44 57 4 90-160 10
≥ 180 20
M20 2.5 46 52 65 5 100-160 10
≥ 180 20
M24 3 54 60 73 6 130-160 10
≥ 180 20
M30 3.5 66 72 85 7 150-160 10
≥ 180 20
M36 4 78 84 97 8 ≥ 200 20
M42 4.5 90 96 109 9 ≥ 240 20
M48 5 ... 108 121 10 ≥ 280 20
M56 5.5 ... 124 137 11 ≥ 300 20
M64 6 ... 140 153 12 ≥ 340 20
M72 6 ... 156 169 12 ≥ 380 20
M80 6 ... 172 185 12 ≥ 400 20
M90 6 ... ... 205 12 ≥ 440 20
M100 6 ... ... 225 12 ≥ 480 20

General Note :All dimensions are in millimeters unless otherwise indicated

Body Dimensions for Metric Double-End Studs

Nominal Size Body Diameter, Dg for Reduced-Body Studs Body Diameter, Ds for Full-Body Studs
Maximum Overall Length, LT Minimum Maximum Minimum Overall Length, LT
Diameter, D Pitch, P ≤ 150 > 150 ≤ 150 > 150
M6 1 5.39 5.51 5.21 6.00 5.82 5.70
M8 1.25 7.26 7.40 7.04 8.00 7.78 7.64
M10 1.5 9.08 9.22 8.86 10.00 9.78 9.64
M12 1.75 10.95 11.11 10.68 12.00 11.73 11.57
M14 2 12.77 12.93 12.50 14.00 13.73 13.57
M16 2 14.77 14.93 14.50 16.00 15.73 15.57
M20 2.5 18.49 18.68 18.16 20.00 19.67 19.48
M24 3 22.13 22.32 21.80 24.00 23.67 23.48
M30 3.5 ... 27.98 27.46 30.00 ... 29.48
M36 4 ... 33.74 33.12 36.00 ... 35.38
M42 4.5 ... 39.40 38.78 42.00 ... 41.38
M48 5 ... 45.05 44.43 48.00 ... 47.38
M56 5.5 ... 52.83 52.09 56.00 ... 55.26
M64 6 ... 60.48 59.74 64.00 ... 63.26
M72 6 ... 68.48 67.74 72.00 ... 71.26
M80 6 ... 76.48 75.74 80.00 ... 79.26
M90 6 ... 86.61 85.74 90.00 ... 89.13
M100 6 ... 96.59 95.72 100.00 ... 99.13

Length Tolerances: LT for Metric Double-End Stud Bolts

Nominal Size Length Tolerance(mm)
Over Through
6 10 ± 0.45
10 18 ± 0.55
18 30 ± 0.65
30 50 ± 0.80
50 80 ± 1.50
80 120 ± 1.75
120 180 ± 2.00
180 250 ± 2.30
250 315 ± 2.60
315 400 ± 2.85
400 500 ± 3.15
> 500 ... ± 10.00

ASTM A193 Grade B7 Fastener Coatings

PTFE Coated B7 Fasteners
PTFE Coated
Black Phosphated B7 Fasteners
Black Phosphated
Zinc Plated B7 Fasteners
Zinc Plated
Hot Dip Galvanized B7 Fasteners
Hot Dip Galvanized
Cadium Plated B7 Fasteners
Cadium Plated
Ceramic Coated B7 Fasteners
Ceramic Coated
Zinc Nickel B7 Fasteners
Zinc Nickel
Zinc Flake Coated B7 Fasteners
Zinc Flake Coated