Brochure

9
Subject to change without notice. Please refer to your local Bossard E-Shop for the current assortment and dimensions.
Other variants upon request.
Information Concerning Pilot Data
Holes
Thread-forming screws can be installed in blind
holes as well as through holes. Type and strength of
material of the mating components, hole geometry
and size, and engagement length are decisive for a
proper installation. That information can be found in
the tables to the left.
Pilot Holes for Aluminum Die-Cast
t1 (mm):
The hole entrance is furnished with a chamfer to:
facilitate the die casting process, Strengthen the
casting pin, ease the locating of holes (screw is
guided into hole), prevent material build-up on the
hole entrance, enable the use of cost-efficient
nominal screw lengths t2 / t3 (mm):
Load-bearing engagement length, taper angle
maximum 1°.
Data
Nominal diameter
M2 M2,5 M3 M3,5 M4 M5 M6 M8
Thread pitch (mm) 0,4 0,45 0,5 0,6 0,7 0,8 1 1,25
Tightening torque max. ca. 80% of the breaking torque
Breaking torque min. (Nm) 0,5 1 1,5 2,3 3,4 7,1 12 29
Tensile force min. (kN) 1,65 2,7 4 5,4 7 11,4 16 29
Thickness of material (mm) Pilot hole Ø – H11 for steel, HRB 77 max.; drilled or punched
2 and smaller 1,8 2,25 2,7 3,2 3,6 4,5 5,4 7,25
4 1,85 2,3 2,75 3,2 3,65 4,55 5,45 7,25
6 2,35 2,75 3,2 3,7 4,6 5,5 7,4
8 3,7 4,65 5,55 7,4
10 4,65 5,55 7,5
12 7,5
14 7,5
Nominal diameter M2 M2,5 M3 M3,5 M4 M5 M6 M8
d
1
1)
(mm) 1,9 2,36 2,86 3,32 3,78 4,77 5,69 7,63
d
2
1)
(mm) 1,75 2,2 2,67 3,11 3,54 4,5 5,37 7,24
d
3
1)
(mm) 1,8 2,27 2,76 3,23 3,64 4,6 5,48 7,35
1)
Tolerance
+ (mm) 0 0 0 0 0 0 0 0
for d1, d2, d3 - (mm) 0,04 0,06 0,06 0,075 0,075 0,075 0,075 0,09
t
1
x 45° (mm) variable, minimum 1 x thread pitch P
t
2
2)
(mm) 4,3 5,3 6 6,9 7,8 9,2 11 14
2)
Tolerance
(mm) 0,2 0,2 0,2 0,6 0,5 0,5 0,5 0,5
for t
2
(mm) 0 0 0 0 0 0 0 0
t
3
(mm) 2 2,5 3 3,5 4 5 6 8
All design recommendation should be verified through application testing.