Machinery's Handbook, 31st Edition
Metric Nuts 1733 In ANSI Standards for metric nuts, letter symbols designating dimensional characteris tics are in accord with those used in ISO Standards, except capitals have been used for data processing convenience instead of lower case letters used in ISO Standards. Metric Nut Tops and Bearing Surfaces.— Metric hex nuts, styles 1 and 2, slotted hex nuts, and hex jam nuts are double chamfered in sizes M16 and smaller and in sizes M20 and larger may either be double chamfered or have a washer-faced bearing surface and a cham fered top at the option of the manufacturer. Metric heavy hex nuts are optional either way in all sizes. Metric hex flange nuts have a flange bearing surface and a chamfered top and prevailing-torque type metric hex nuts have a chamfered bearing surface. Prevailing-torque type metrix hex flange nuts have a flange bearing surface. All types of metric nuts have the tapped hole countersunk on the bearing face and metric slotted hex nuts, hex flange nuts, and prevailing-torque type hex nuts and hex flange nuts may be countersunk on the top face. Table 24. American National Standard Metric Slotted Hex Nuts ANSI/ASME B18.2.4.3M-1979 (R2017) S M F M F
C
D w
D w
E
N
Washer Face Thickness C
Width Across Flats, S
Width Across Corners, E
Bearing Face Dia., D w
Nominal Nut Dia. and Thread Pitch
Unslotted Thickness, F
Width of Slot, N
Thickness, M
Max. Min. Max. Min. Max. Min.
Min.
Max. Min. Max. Min. Max. Min. 3.2 2.9 2.0 1.4 … … 3.5 3.2 2.4 1.8 … …
8.00 7.78 9.24 8.79 5.10 4.80 6.9 10.00 9.78 11.55 11.05 5.70 5.40 8.9
M5 × 0.8 M6 × 1 M8 × 1.25 a M10 × 1.5
13.00 12.73 15.01 14.38 7.50 7.14 11.6 4.4 4.1 2.9 2.3 … … 15.00 14.73 17.32 16.64 10.0 9.6 13.6 5.7 5.4 3.4 2.8 0.6 0.3
M10 × 1.5 16.00 15.73 18.48 17.77 9.30 8.94 14.6 5.2 4.9 3.4 2.8 … … M12 × 1.75 18.00 17.73 20.78 20.03 12.00 11.57 16.6 7.3 6.9 4.0 3.2 … … M14 × 2 21.00 20.67 24.25 23.35 14.10 13.40 19.6 8.6 8.0 4.3 3.5 … … M16 × 2 24.00 23.67 27.71 26.75 16.40 15.70 22.5 9.9 9.3 5.3 4.5 … … M20 × 2.5 30.00 29.16 34.64 32.95 20.30 19.00 27.7 13.3 12.2 5.7 4.5 0.8 0.4 M24 × 3 36.00 35.00 41.57 39.55 23.90 22.60 33.2 15.4 14.3 6.7 5.5 0.8 0.4 M30 × 3.5 46.00 45.00 53.12 50.85 28.60 27.30 42.7 18.1 16.8 8.5 7.0 0.8 0.4 M36 × 4 55.00 53.80 63.51 60.79 34.70 33.10 51.1 23.7 22.4 8.5 7.0 0.8 0.4 a This size with width across flats of 15 mm is not standard. Unless specifically ordered, M10 slotted hex nuts with 16 mm width across flats will be furnished. All dimensions are in millimeters. Materials and Mechanical Properties.— Non-heat-treated carbon steel metric hex nuts, style 1 and slotted hex nuts conform to material and property class requirements specified for property class 5 nuts; hex nuts, style 2 and hex flange nuts to property class 9 nuts; hex jam nuts to property class 4 nuts, and non-heat-treated carbon and alloy steel heavy hex nuts to property classes 5, 9, 8S, or 8S3 nuts; all as covered in ASTM A563M. Carbon steel metric hex nuts, style 1 and slotted hex nuts that have specified heat treatment conform to material and property class requirements specified for property class 10 nuts; hex nuts, style 2 to property class 12 nuts; hex jam nuts to property class 05 nuts; hex flange nuts to property classes 10 and 12 nuts; and carbon or alloy steel heavy hex nuts to property classes 10S, 10S3, or 12 nuts, all as covered in ASTM A563M. Carbon steel prevailing- torque type hex nuts and hex flange nuts conform to mechanical and property class re - quirements as given in ANSI/ASME B18.16M-2004 (R2016).
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