EN 14399

en-14399

High-Strength Structural Bolting Assemblies For Preloading

Mushroom Head Square Neck Bolts / Cup Square Bolts

EN 14399

High-strength structural bolting assemblies for preloading – Part 3: System HR – Hexagon bolt and nut assemblies
Dimensions
NOTE: The difference between lg and ls should not be less than 1,5 P.
Key
a Incomplete thread u ≤ 2P

b 15° to 30°


Dimension in millimeter

Table 2 — Dimensions of bolts a

Thread d M12 (M14)b M16 (M18)b M20 M22 M24 M27 M30 M36
P c 1.8 2.0 2.0 2.5 2.5 2.5 3.0 3.0 3.5 4.0
b (ref.) d 30 34 38 42 46 50 54 60 66 78
e 40 44 48 52 56 60 66 72 84
f 65 69 73 79 85 97
c Max. 0.8 0.8 0.8 0.8 0.8 0.8 0.8 0.8 0.8 0.8
Min. 0.4 0.4 0.4 0.4 0.4 0.4 0.4 0.4 0.4 0.4
da Max. 15.20 17.20 19.20 21.70 24.40 26.40 28.40 32.40 35.40 42.40
ds Max. 12.70 14.70 16.70 18.70 20.84 22.84 24.84 27.84 30.84 37.00
Min. 11.30 13.30 15.30 17.30 19.16 21.16 23.16 26.16 29.16 35.00
dw Max. g g g g g g g g g g
Min. 20.10 22.00 24.90 27.70 29.50 33.30 38.00 42.80 46.60 55.90
e Min. 23.91 26.17 29.56 32.95 35.03 39.55 45.20 50.85 55.37 66.44
k Nom. 7.50 8.80 10.00 11.50 12.50 14.00 15.00 17.00 18.70 22.50
Max. 7.95 9.25 10.75 12.40 13.40 14.90 15.90 17.90 19.75 23.55
Min. 7.05 8.35 9.25 10.60 11.60 13.10 14.10 16.10 17.65 21.45
kw Min. 4.90 5.85 6.50 7.42 8.10 9.20 9.90 11.30 12.40 15.00
r Min. 1.2 1.2 1.2 1.5 1.5 1.5 1.5 2.0 2.0 2.0
s Max. 22 24 27 30 32 36 41 46 50 60
Min. 21.16 23.16 26.16 29.16 31.00 35.00 40.00 45.00 49.00 58.80

All data for information purpose only. For more details on product standards or dimensions, please feel free to contact us at enquiry@kova.in