ASME B18.16.3M Prevailing Torque Metric Hex Flange Nuts

EN 1665 Hexagon bolt with flanged solid shank (standard desgin)
EN 1665 Hexagon bolt with flange - Reduced shank, form R (By arrangement)
EN 1665 Hexagon bolt with flange - Reduced shank, form R (By arrangement)

Dimensions

Dimensions shall be in accordance with Figure 1 to Figure 3 and Table 1. NOTE Symbols and designations of dimensions are specified in EN20225

Thread (d) M5 M6 M8 M10 M12 (M14)1 M16 M20
P2 0.8 1 1.25 1.5 1.75 2 2 2.5
b(ref) 3 16 18 22 26 30 34 38 46
4 -- -- 28 32 36 40 44 52
5 -- -- -- -- -- -- 57 55
c min. 1 1.1 1.2 1.5 1.8 2.1 2.4 3
da Type F max. 5.7 6.8 9.2 11.2 13.7 15.7 17.7 22.4
Type U 6.2 7.5 10 12.5 15.2 17.7 20.5 25.7
dc max. 11.8 14.2 18 22.3 26.6 30.5 35 43
ds max. 5.00 6.00 8.00 10.00 12.00 14.00 16.00 20.00
min. 4.82 5.82 7.78 9.78 11.73 13.73 15.73 19.67
dv max. 5.5 6.6 8.8 10.8 12.8 14.8 17.2 21.6
dw min. 9.8 12.2 15.8 19.6 23.8 27.6 31.9 39.9
e min. 8.71 10.95 14.26 17.62 19.86 23.15 26.51 33.23
k max. 5.8 6.6 8.1 10.4 11.8 13.7 15.4 18.9
kw min. 2.6 3.0 3.9 4.1 5.6 6.5 7.3 8.9
lr max. 1.4 1.6 2.1 2.1 2.1 2.1 3.2 4.2
r1 min. 0.2 0.25 0.4 0.4 0.6 0.6 0.6 0.8
r2(18) max. 0.3 0.4 0.5 0.6 0.7 0.9 1 1.2
r3 max. 0.25 0.26 0.36 0.45 0.54 0.63 0.72 0.9
min. 0.10 0.11 0.16 0.20 0.24 0.28 0.32 0.4
r4 (ref.) 4 4.4 5.7 5.7 5.7 5.7 8.8 11.4
s max. 8.00 10.00 13.00 16.00 18.00 21.00 24.00 30.00
min. 7.78 9.78 12.73 14.73 17.73 20.67 23.67 29.67
v max. 0.15 0.20 0.25 0.30 0.35 0.45 0.50 0.65
min. 0.05 0.05 0.10 0.15 0.15 0.20 0.25 0.30
l(7)(8) ls and lg(9)
nom.
length		 min. 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.
10 9.71 10.29 --

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12 11.65 12.35
16 15.65 16.35
20 19.58 20.42 -- -- -- -- -- -- -- --
25 24.58 25.42 5 9 -- -- -- -- -- -- -- --
30 29.58 30.42 10 14 7 12 -- -- -- -- -- -- -- --
35 34.5 35.5 15 19 12 17 6.75 13 -- -- -- -- -- -- -- -- -- --
40 39.5 40.5 20 24 17 22 11.75 18 6.5 14 -- -- -- -- -- -- -- --
45 44.5 45.5 25 29 22 27 16.75 23 11.5 19 6.25 15 -- -- -- -- -- --
50 49.5 50.5 30 34 27 32 21.75 28 16.5 24 11.25 20 6 16 -- -- -- --
55 54.4 55.6 32 37 26.75 33 21.5 29 16.25 25 11 21 7 17
60 59.4 60.6 37 42 31.75 38 26.5 34 21.25 30 16 26 12 22
65 64.4 65.6 36.75 43 31.5 39 26.25 35 21 31 17 27 6.5 19
70 69.4 70.6 41.75 48 36.5 44 31.25 40 26 36 22 32 11.5 24
80 79.4 80.6 51.75 58 46.5 54 41.25 50 36 46 32 42 21.5 34
90 89.3 90.7 56.5 64 51.25 60 46 56 42 52 31.5 44
100 99.3 100.7 66.5 74 61.25 70 56 66 52 62 41.5 54
110 109.3 110.7 71.25 80 66 76 62 72 51.5 64
120 119.3 120.7 81.25 90 76 86 72 82 61.5 74
130 129.2 130.8 80 90 76 86 65.5 78
140 139.2 140.8 90 100 86 96 75.5 88
150 149.2 150.8 96 106 85.5 98
160 159.2 160.8 106 116 95.5 108
180 179.2 180.8 115.5 128
180 179.2 180.8 135.5 148

NOTE If the product passes the gauging in Annex A, the requirements for dimensions e amd Kw are satisfied.

  • The Size in Parentheses should be avoided if possible.
  • P is the pitch of the thread
  • For Lengths lnom ≤ 125 mm.
  • For Lengths 125 mm < lnom ≤ 200 mm.
  • For lengths lnom > 200 mm.
  • Radius r2 applies both at the corners and at the flats of the hexagon.
  • Screws with lengths shown above the thick stepped line are threaded to head.
  • Reduced shank type (type R) onky below the dashed stepped line.
  • lg is the minimum grip length.

Requirements and reference European or international Standards

The requirements given in Table 2 apply. If, in special cases, specifications other than those listed in this European Standard are required, they shall be selected, from existing European or international Standards, for example ISO 724, ISO888, prEN ISO 898-1, ISO 965-2, prEN ISO 3506-1.

Material Steel Stainless Steel
General requirement International Standard ISO 8992
Thread Tolerance 6g
International Standards ISO 724, ISO 965-2
Mechanical properties Property class 8.8, 10.9 A2-70
European Standards pr EN ISO 898-1 pr EN ISO 3506-1
Tolerances Product grade A
European Standards pr EN ISO 4759-1
Finish Black oxide
(thermic or chemical)
Requirements for
electroplating are
covered in
prEN ISO 4042. 		Plain
If different electroplating requirements are desired or if requirements are needed for other
finishes, they should be negotiated between customer and supplier.
Limits for surface
discontinuites are
coverd in EN 26157-3
Acceptability For acceptance inspection ISO 3269 applies.

Designation

Example 1.
Designation of a hexagon bolt with flange, heavy series, with thread M12, nominal length l =80mm, type F or U at the option of the manufacturer, and property class 8.8:

Hexagon bolt EN 1665 – M12 × 80 – 8.8


Example 2.
Designation of a hexagon bolt with flange, heavy series, with thread M12, nominal length l = 80mm, type F, and property class 8.8:

Hexagon bolt EN 1665 – M12 × 80–F – 8.8

If, in special cases, a hexagon bolt with flange, heavy series, with reduced shank is required, the letter R shall be included in the designation.
Example 3.
Designation of a hexagon bolt with flange, heavy series, with thread M12, nominal length l = 80mm, type F or U at the option of the manufacturer, with reduced shank (R) and property class 8.8:

Hexagon bolt EN 1665 – M12 × 80– R — 8.8