Machinery's Handbook, 31st Edition
Metric Nuts
1735
Table 26. American National Standard Metric Hex Flange Nuts ANSI/ASME B18.2.4.4M-1982 (Withdrawn)
S D c
M
C
Contour optional 1.5° Max
C
X
15°–30°
D c
E
D w
R
D w
Chamfer
15–30°
DETAIL X
Identification
Flange Top Fillet Radius, R
Flange Edge Thick ness, C
Bearing Circle Dia., D w
Width Across Flats, S
Width Across Corners, E
Nominal Nut Dia. and Thread Pitch
Flange Dia., D c Max.
Thickness, M
Max.
Min.
Max.
Min.
Min.
Min.
Max.
Min.
Max.
8.00 7.78 9.24 8.79 11.8
9.8
1.0 1.1 1.2
5.00 4.70 6.00 5.70 8.00 7.60
0.3 0.4 0.5 0.6
M5 × 0.8
10.00 9.78 11.55 11.05 14.2 12.2 13.00 12.73 15.01 14.38 17.9 15.8 15.00 14.73 17.32 16.64 21.8 19.6 18.00 17.73 20.78 20.03 26.0 23.8 21.00 20.67 24.25 23.35 29.9 27.6 24.00 23.67 27.71 26.75 34.5 31.9 30.00 29.16 34.64 32.95 42.8 39.9
M6 × 1
M8 × 1.25 M10 × 1.5 M12 × 1.75
1.5 10.00 9.60
1.8 12.00 11.60 0.7 2.1 14.00 13.30 0.9 2.4 16.00 15.30 1.0 3.0 20.00 18.90 1.2
M14 × 2 M16 × 2
M20 × 2.5
All dimensions are in millimeters.
Metric nuts of other materials, such as stainless steel, brass, bronze, and aluminum alloys, have properties as agreed upon by the manufacturer and purchaser. Properties of nuts of several grades of nonferrous materials are covered in ASTM F467M. Unless otherwise specified, metric nuts are furnished with a natural (unprocessed) finish, unplated or uncoated. Metric Nut Thread Series.— Metric nuts have metric coarse threads with class 6H toler ances in accordance with ANSI/ASME B1.13M (see Metric Screw and Bolt Diameter- Length Combinations on page 1726 ). For prevailing-torque type metric nuts this condi - tion applies before introduction of the prevailing torque feature. Nuts intended for use with externally threaded fasteners which are plated or coated with a plating or coating thickness (e.g., hot dip galvanized) requiring overtapping of the nut thread to permit as - sembly, have over-tapped threads in conformance with requirements specified in ASTM A563M. Types of Metric Prevailing-Torque Type Nuts.— There are three basic designs for pre vailing-torque type nuts: 1) All-metal, one-piece construction nuts which derive their prevailing-torque characteristics from controlled distortion of the nut thread and/or body. 2) Metal nuts which derive their prevailing-torque characteristics from addition or fusion of a nonmetallic insert, plug or patch in their threads.
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