Machinery's Handbook, 31st Edition
Metric Screws and Bolts 1731 Table 22. Drilled Head Dimensions for Metric Hex Socket Head Cap Screws
W
60° nom
180° nom
60° nom
60° nom
X
Two holes
Six holes
Hole Alignment Check Plug Diameter
Drilled Hole Diameter, X
Hole Center Location, W
Nominal Size or Basic Screw Diameter
Max. 1.20 1.60 2.00 2.30 2.70 3.30 4.00 5.00 6.30 7.30 9.00 10.50
Min. 0.80 1.20 1.50 1.80 2.20 2.80 3.50 4.50 5.80 6.80 8.50 10.00
Max. 0.95 1.35 1.35 1.35 1.35 1.65 1.65 1.65 2.15 2.15 2.15 2.15
Min. 0.80 1.20 1.20 1.20 1.20 1.50 1.50 1.50 2.00 2.00 2.00 2.00
Basic 0.75 0.90 0.90 0.90 0.90 1.40 1.40 1.40 1.80 1.80 1.80 1.80
M3 M4 M5 M6
M8 M10 M12 M16 M20 M24 M30 M36
All dimensions are in millimeters. Drilled head metric hexagon socket head cap screws normally are not available in screw sizes smaller than M3 nor larger than M36. The M3 and M4 nominal screw sizes have two drilled holes spaced 180 degrees apart. Nominal screw sizes M5 and larger have six drilled holes spaced 60 degrees apart unless the purchaser specifies two drilled holes. The positioning of holes on opposite sides of the socket should be such that the hole alignment check plug will pass completely through the head without any deflection. When so specified by the purchaser, the edges of holes on the out side surface of the head will be chamfered 45 degrees to a depth of 0.30 to 0.50 mm. Metric Nuts The American National Standards covering metric nuts have been established in cooperation with the Department of Defense in such a way that they could be used by the government for procurement purposes. Extensive information concerning these nuts is given in the following text and tables, but for more complete manufacturing and accep - tance specifications, reference should be made to the respective Standards, which may be obtained by non-governmental agencies from the American National Standards Institute, 25 West 43rd Street, New York, NY 10036, www.ansi.org. Manufacturers should be con- sulted concerning items and sizes which are in stock production. Comparison with ISO Standards.— American National Standards for metric nuts have been coordinated to the extent possible with comparable ISO Standards or proposed Standards, thus: ANSI B18.2.4.1M Metric Hex Nuts, Style 1 with ISO 4032; B18.2.4.2M Metric Hex Nuts, Style 2 with ISO 4033; B18.2.4.4M Metric Hex Flange Nuts with ISO 4161; B18.2.4.5M Metric Hex Jam Nuts with ISO 4035; and B18.2.4.3M Metric Slotted Hex Nuts, B18.2.4.6M Metric Heavy Hex Nuts in sizes M12 through M36, and B18.16M Prevailing-Torque Type Steel Metric Hex Nuts and Hex Flange Nuts with comparable draft ISO Standards. The dimensional differences between each ANSI Standard and the comparable ISO Standard or draft Standard are very few, relatively minor, and none will affect the interchangeability of nuts manufactured to the requirements of either.
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