HBM U10M, Mounting Instructions, Page: 17 / 128

17
U10M, U10S
A1385-6.2 en/de/fr HBM
The customers's own structural elements (threaded bolts) must meet the fol­
lowing conditions:

The upper and lower force application components must be aligned in one
axis. Installation is facilitated by centering aids on the top and bottom sides.
The admissible centering diameter corresponds to dimension D, the
admissible centering depth is 3 mm (see Page 35ff).

The anti‐screw‐through device attached to the interior thread of the adapter
must not be removed.

The (customer‐side) external thread must comply with a thread tolerance of
6g for metric threads and 3A for UN/UNF threads.

The threads must be cleaned of any deposits and soaked with graphite‐free
grease before being screwed in.

The following applies for steel force transducers (nominal (rated) forces
from 12.5 kN): To achieve the full endurance strength, a material with
sufficient tensile strength (min. R
p,0.2
= 900 N/mm
2
) and hardness
(min. 40 HRC) must be used. We recommend the use of threads rolled
after heat treatment for measurement ranges between 225 kN and 500 kN.
The screwed‐in force application units must be sufficiently pre‐stressed to
meet the specified specifications and the full endurance strength of the
threads. This is implemented with a locknut screwed onto the customer‐side
structural element. We recommend using one of the methods described
below.
1. Pre‐stressing with defined tightening torque

Screw the force application part into the transducer or adapter as far as
the retainer.

Unscrew force application part two revolutions.

Pre‐stress force application part with defined tightening torque.
Nominal (rated)
force
Tightening torque M
A
Screw‐in depth
in kN in N
@
m in lb
@
inch in mm in inch
1.25 17 150 26.4 1.04
2.5 35 310 26.4 1.04
5 68 600 26.4 1.04
12.5 135 1195 26.4 1.04
25 135 1195 26.4 1.04
2. Pre‐stressing with tensile forces (for nominal (rated) forces from 50 kN)
Force transducers with any nominal (rated) force can be mounted using
this method. The procedure should always be used for for force trans­