ASME B18.2.3.4m Metric Formed Hex Screws
ASME B18.2.3.4M Standard covers the complete dimensional
and general data for metric formed hex screws recognized as American National Standard. Formed hex
screws are cold formed products with fully upset
(non-trimmed) heads. Formed hex screws are standard only in sizes M5 thru M24, with lengths up to
150 mm, or 10 times nominal screw size, whichever is
shorter.
The inclusion of dimensional data in ASME B18.2.3.4M Standard is not intended to imply that
all of the sizes in
conjunction with the various options described herein
are stock items. Consumers should consult with suppliers concerning lists of stock production formed
hex
screws.
The Tables measurements are also converted into millimeters to make the information clearer and
easier to understand.
ASME B18.2.3.4m Dimensions of Formed Hex Screws
| Nominal Diameter, D | Body Diameter, Ds | Width Across Flats, S | Width Across Corners, E | Head Height, K | Wrenching Height, Kw | Washer Face Thickness, C | Washer Face Diameter, Dw | Runout of Bearing Surface FIM | Fillet Transition Diameter | Fillet Length | Fillet Radius, R | Shoulder Diameter, Ds | Body Diameter, Dsi | Shoulder Length, Lsh | Point Radius, Re Approx. | Point Length, U Max. | Thread Length, B (Ref.) | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Max. | Min. | Max. | Min. | Max. | Min. | Max. | Min. | Min. | Max. | Min. | Min. | Max. | For Short Screws, Da1 Min. | For Short and Long Screws, Da Max. | For Short Screws, F1 Max. | For Long Screws, F Max. | For Short and Long Screws Min. | Max. | Min. | Max. | Min. | Max. | Min. | Screw Lengths ≤ 125 | Screw Lengths > 125 and ≤ 200 | Screw Lengths > 200 | |||
| M5 | 5.00 | 4.82 | 8.00 | 7.64 | 9.24 | 8.56 | 3.65 | 3.35 | 2.4 | 0.5 | 0.2 | 6.9 | 0.22 | 5.1 | 5.7 | 0.7 | 1.2 | 0.2 | 5.00 | 4.82 | 4.46 | 4.36 | 3.5 | 2.5 | 7.0 | 1.60 | 16 | 22 | 35 |
| M6 | 6.00 | 5.82 | 10.00 | 9.64 | 11.55 | 10.80 | 4.15 | 3.85 | 2.0 | 0.5 | 0.2 | 8.9 | 0.25 | 6.2 | 6.8 | 0.9 | 1.4 | 0.3 | 6.00 | 5.82 | 5.39 | 5.21 | 4.0 | 3.0 | 8.4 | 2.00 | 18 | 24 | 37 |
| M8 | 8.00 | 7.78 | 13.00 | 12.57 | 15.01 | 14.08 | 5.50 | 5.10 | 3.7 | 0.6 | 0.3 | 11.6 | 0.28 | 8.3 | 9.2 | 1.1 | 2.0 | 0.4 | 8.00 | 7.78 | 7.26 | 7.04 | 5.0 | 4.0 | 11.2 | 2.50 | 22 | 28 | 41 |
| M10 | 10.00 | 9.78 | 15.00 | 14.57 | 17.32 | 16.32 | 6.63 | 6.17 | 4.5 | 0.6 | 0.3 | 13.6 | 0.31 | 10.2 | 11.2 | 1.2 | 2.0 | 0.4 | 10.00 | 9.78 | 9.08 | 8.86 | 6.0 | 5.0 | 14.0 | 3.00 | 26 | 32 | 45 |
| M12 | 12.00 | 11.73 | 18.00 | 17.57 | 20.78 | 19.68 | 7.76 | 7.24 | 5.2 | 0.6 | 0.3 | 16.6 | 0.35 | 12.2 | 13.7 | 1.3 | 3.0 | 0.6 | 12.00 | 11.73 | 10.95 | 10.68 | 7.0 | 6.0 | 16.8 | 3.50 | 30 | 36 | 49 |
| M14 | 14.00 | 13.73 | 21.00 | 20.16 | 24.25 | 22.58 | 9.09 | 8.51 | 6.2 | 0.6 | 0.3 | 19.6 | 0.39 | 14.1 | 15.7 | 1.4 | 3.0 | 0.6 | 14.00 | 13.73 | 12.77 | 12.50 | 8.0 | 7.0 | 19.6 | 4.00 | 34 | 40 | 53 |
| M16 | 16.00 | 15.73 | 24.00 | 23.16 | 27.71 | 25.94 | 10.32 | 9.68 | 7.0 | 0.8 | 0.4 | 22.5 | 0.43 | 16.5 | 17.7 | 1.6 | 3.0 | 0.6 | 16.00 | 15.73 | 14.77 | 14.50 | 9.0 | 8.0 | 22.4 | 4.00 | 38 | 44 | 57 |
| M20 | 20.00 | 19.67 | 30.00 | 29.16 | 34.64 | 32.66 | 12.88 | 12.12 | 8.8 | 0.8 | 0.4 | 27.7 | 0.53 | 20.7 | 22.4 | 2.1 | 4.0 | 0.8 | 20.00 | 19.67 | 18.49 | 18.16 | 11.0 | 10.0 | 28.0 | 5.00 | 46 | 52 | 65 |
| M24 | 24.00 | 23.67 | 36.00 | 35.00 | 41.57 | 39.20 | 15.44 | 14.46 | 10.5 | 0.8 | 0.4 | 33.2 | 0.63 | 24.5 | 26.4 | 2.3 | 4.0 | 0.8 | 24.00 | 23.67 | 22.13 | 21.80 | 13.0 | 12.0 | 33.6 | 6.00 | 54 | 60 | 73 |
ASME B18.2.3.4m Maximum Grip Gaging Lengths and Minimum Body Lengths
| Nominal Length, L | M5 x 0.8 | M6 x 1 | M8 x 1.25 | M10 x 1.5 | M12 x 1.75 | M14 x 2 | M16 x 2 | M20 x 2.5 | M24 x 3 | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Lg Max. |
Ls Min. |
Lg Max. |
Ls Min. |
Lg Max. |
Ls Min. |
Lg Max. |
Ls Min. |
Lg Max. |
Ls Min. |
Lg Max. |
Ls Min. |
Lg Max. |
Ls Min. |
Lg Max. |
Ls Min. |
Lg Max. |
Ls Min. |
|
| 8 | Full Thread | Full Thread | Full Thread | Full Thread | Full Thread | Full Thread | Full Thread | Full Thread | Full Thread | |||||||||
| 10 | Full Thread | Full Thread | Full Thread | Full Thread | Full Thread | Full Thread | Full Thread | Full Thread | Full Thread | |||||||||
| 12 | Full Thread | Full Thread | Full Thread | Full Thread | Full Thread | Full Thread | Full Thread | Full Thread | Full Thread | |||||||||
| 14 | Full Thread | Full Thread | Full Thread | Full Thread | Full Thread | Full Thread | Full Thread | Full Thread | Full Thread | |||||||||
| 16 | Full Thread | Full Thread | Full Thread | Full Thread | Full Thread | Full Thread | Full Thread | Full Thread | Full Thread | |||||||||
| 20 | Full Thread | Full Thread | Full Thread | Full Thread | Full Thread | Full Thread | Full Thread | Full Thread | Full Thread | |||||||||
| 25 | 5.0 | 9.0 | Full Thread | Full Thread | Full Thread | Full Thread | Full Thread | Full Thread | Full Thread | Full Thread | ||||||||
| 30 | 10.0 | 14.0 | 7.0 | 12.0 | Full Thread | Full Thread | Full Thread | Full Thread | Full Thread | Full Thread | Full Thread | |||||||
| 35 | 15.0 | 19.0 | 12.0 | 17.0 | Full Thread | Full Thread | Full Thread | Full Thread | Full Thread | Full Thread | Full Thread | |||||||
| 40 | 20.0 | 24.0 | 17.0 | 22.0 | 11.8 | 18.0 | Full Thread | Full Thread | Full Thread | Full Thread | Full Thread | Full Thread | ||||||
| 45 | 25.0 | 29.0 | 22.0 | 27.0 | 16.8 | 23.0 | 11.5 | 19.0 | Full Thread | Full Thread | Full Thread | Full Thread | Full Thread | |||||
| 50 | 30.0 | 34.0 | 27.0 | 32.0 | 21.8 | 28.0 | 16.5 | 24.0 | 11.2 | 20.0 | Full Thread | Full Thread | Full Thread | Full Thread | ||||
| 55 | 32.0 | 37.0 | 26.8 | 33.0 | 21.5 | 29.0 | 16.2 | 25.0 | Full Thread | Full Thread | Full Thread | Full Thread | ||||||
| 60 | 37.0 | 42.0 | 31.8 | 38.0 | 26.5 | 34.0 | 21.2 | 30.0 | 16.0 | 26.0 | Full Thread | Full Thread | Full Thread | |||||
| 65 | 36.8 | 43.0 | 31.5 | 39.0 | 26.2 | 35.0 | 21.0 | 31.0 | 17.0 | 27.0 | Full Thread | Full Thread | ||||||
| 70 | 41.8 | 48.0 | 36.5 | 44.0 | 31.2 | 40.0 | 26.0 | 36.0 | 22.0 | 32.0 | Full Thread | Full Thread | ||||||
| 80 | 51.8 | 58.0 | 46.5 | 54.0 | 41.2 | 50.0 | 36.0 | 46.0 | 32.0 | 42.0 | 21.5 | 34.0 | Full Thread | |||||
| 90 | 56.5 | 64.0 | 51.2 | 60.0 | 46.0 | 56.0 | 42.0 | 52.0 | 31.5 | 44.0 | 21.0 | 36.0 | ||||||
| 100 | 66.5 | 74.0 | 61.2 | 70.0 | 56.0 | 66.0 | 52.0 | 62.0 | 41.5 | 54.0 | 31.0 | 46.0 | ||||||
| 110 | 71.2 | 80.0 | 66.0 | 76.0 | 62.0 | 72.0 | 51.5 | 64.0 | 41.0 | 56.0 | ||||||||
| 120 | 81.2 | 90.0 | 76.0 | 86.0 | 72.0 | 82.0 | 61.5 | 74.0 | 51.0 | 66.0 | ||||||||
| 130 | 80.0 | 90.0 | 76.0 | 86.0 | 65.5 | 78.0 | ||||||||||||
| 140 | 90.0 | 100.0 | 86.0 | 96.0 | 75.5 | 88.0 | ||||||||||||
| 150 | 96.0 | 106.0 | 85.5 | 98.0 | ||||||||||||||
ASME B18.2.3.4m Length Tolerances
| Nominal Length | Nominal Diameter | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| Over | Thru | M5 | M6 | M8 | M10 | M12 | M14 | M16 | M20 | M24 |
| 6 | 10 | ±0.29 | ±0.29 | ±0.29 | ±0.29 | . . . | . . . | . . . | . . . | . . . |
| 10 | 18 | ±0.35 | ±0.35 | ±0.35 | ±0.35 | ±0.35 | ±0.35 | ±0.35 | ±0.35 | ±0.35 |
| 18 | 30 | ±0.42 | ±0.42 | ±0.42 | ±0.42 | ±0.42 | ±0.42 | ±0.42 | ±0.42 | ±0.42 |
| 30 | 50 | ±0.50 | ±0.50 | ±0.50 | ±0.50 | ±0.50 | ±0.50 | ±0.50 | ±0.50 | ±0.50 |
| 50 | 60 | ±1.50 | ±0.60 | ±0.60 | ±0.60 | ±0.60 | ±0.60 | ±0.60 | ±0.60 | ±0.60 |
| 60 | 80 | ±1.50 | ±1.50 | ±0.60 | ±0.60 | ±0.60 | ±0.60 | ±0.60 | ±0.60 | ±0.60 |
| 80 | 100 | ±1.75 | ±1.75 | ±1.75 | ±0.70 | ±0.70 | ±0.70 | ±0.70 | ±0.70 | ±0.70 |
| 100 | 120 | ±1.75 | ±1.75 | ±1.75 | ±1.75 | ±0.70 | ±0.70 | ±0.70 | ±0.70 | ±0.70 |
| 120 | 140 | ±2.00 | ±2.00 | ±2.00 | ±2.00 | ±2.00 | ±0.80 | ±0.80 | ±0.80 | ±0.80 |
| 140 | 150 | ±2.00 | ±2.00 | ±2.00 | ±2.00 | ±2.00 | ±2.00 | ±0.80 | ±0.80 | ±0.80 |
| 150 | 180 | ±2.00 | ±2.00 | ±2.00 | ±2.00 | ±2.00 | ±2.00 | ±2.00 | ±2.00 | ±2.00 |
| 180 | 250 | ±2.30 | ±2.30 | ±2.30 | ±2.30 | ±2.30 | ±2.30 | ±2.30 | ±2.30 | ±2.30 |
| 250 | 315 | ±2.60 | ±2.60 | ±2.60 | ±2.60 | ±2.60 | ±2.60 | ±2.60 | ±2.60 | ±2.60 |
| 315 | 400 | ±2.85 | ±2.85 | ±2.85 | ±2.85 | ±2.85 | ±2.85 | ±2.85 | ±2.85 | ±2.85 |
| 400 | 500 | ±3.15 | ±3.15 | ±3.15 | ±3.15 | ±3.15 | ±3.15 | ±3.15 | ±3.15 | ±3.15 |
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ISO Material Specifications
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ISO
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ISO
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