Machinery's Handbook, 31st Edition
1736 Metric Nuts 3) Top insert, two-piece construction nuts which derive their prevailing-torque charac teristics from an insert, usually a full ring of non-metallic material, located and retained in the nut at its top surface. The first two designs are designated in Table 29 and Table 27 as “all-metal” type and the third design as “top-insert” type. Table 27. American National Standard Prevailing-Torque Metric Hex Flange Nuts ANSI/ASME B18.16M-2004 (R2016)
D c
M
S
C
Identi- fication
Countersink
E
D w
(Optional)
15–30° R
Note: Size, Shape and Location of the Prevailing Torque Element Optional
All Metal Type a
Top Insert Type
Width Across Flats, S
Width Across Corners, E
Nominal Dia. and Thread Pitch
Thickness, M (All Nut Property Classes)
Max.
Min.
Max.
Min.
Max.
Min.
Max.
Min. Max. Min. Min. Max.
10.00 9.78 11.55 11.05 13.00 12.73 15.01 14.38
7.30 5.70 8.80 8.00 14.2 12.2 1.1 0.4 9.40 7.60 10.70 9.70 17.9 15.8 1.2 0.5
M6 × 1 M8 × 1.25 M10 × 1.5 M12 × 1.75 M14 × 2 M16 × 2 M20 × 2.5
15.00 14.73 17.32 16.64 11.40 9.60 13.50 12.50 21.8 19.6 1.5 0.6 18.00 17.73 20.78 20.03 13.80 11.60 16.10 15.10 26.0 23.8 1.8 0.7 21.00 20.67 24.25 23.35 15.90 13.30 18.20 17.00 29.9 27.6 2.1 0.9 24.00 23.67 27.71 26.75 18.30 15.30 20.30 19.10 34.5 31.9 2.4 1.0 30.00 29.16 34.64 32.95 22.40 18.90 24.80 23.50 42.8 39.9 3.0 1.2
a Also includes metal nuts with nonmetallic inserts, plugs, or patches in their threads. All dimensions are in millimeters. Metric Nut Identification Symbols.— Carbon steel hex nuts, styles 1 and 2, hex flange nuts, and carbon and alloy steel heavy hex nuts are marked to identify the property class and manufacturer in accordance with requirements specified in ASTM A563M. The aforementioned nuts when made of other materials, as well as slotted hex nuts and hex jam nuts, are marked to identify the property class and manufacturer as agreed upon by manufacturer and purchaser. Carbon steel prevailing-torque type hex nuts and hex flange nuts are marked to identify property class and manufacturer as specified in ANSI/ASME B18.16M. Prevailing-torque type nuts of other materials are identified as agreed upon by the manufacturer and purchaser. Metric Nut Designation.— Metric nuts are designated by the following data, preferably in the sequence shown: product name, nominal diameter and thread pitch, steel property class or material identification, and protective coating, if required. (Note: It is common practice in ISO Standards to omit thread pitch from the product designation when the nut threads are the metric coarse thread series, e.g., M10 stands for M10 × 1.5). Example: Hex nut, style 1, M10 × 1.5, ASTM A563M class 10, zinc plated Heavy hex nut, M20 × 2.5, silicon bronze, ASTM F467, grade 651 Slotted hex nut, M20, ASTM A563M class 10.
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