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4
Lifting Points for bolt on
• The position to be designed in such a way that the
introduced forces can be accepted by the basic materi-
al without deformations. German authorities recommend
the following minimum bolting lengths:
1
x M in steel (M = thread size, e.g. M 20)
1,25 x M in cast iron
2
x M in aluminium
HINT:
Please pay attention to the bolt-on surface and
make sure that it is plane (at least where the
lifting point will be attached) and perpendicular
in regard of the thread. Blind holes must be
drilled deep enough to make sure that the bolt-
on surface will be bearing. Please engage the
lifting points until bearing surface of the lifting
points sits proper at bolt-on area. If the lifting
points are designated to stay permanent at the
load, make sure that they will be tightened with
the required torque moment stated in the user
instruction.
• With shock loadings, twisting or vibrations, especially
with through bolts and nuts, an unintentional dismounting
may occur. Possibilities of securing: liquid means such
as Loctite or WEICONLOCK (respect manufacturer's
prescriptions) or form closed bolt securing such as crown
nut with key, counter nut, etc.
• Secure in general all lifting points which are installed
permanently, e.g. with glue.
• With light metals, non ferrous heavy metals and grey
cast, the thread arrangement has to be chosen in such
a way that the WLL of the thread corresponds with the
respective basic material.
• RUD will not accept any warranty for the use of any bolts
not supplied by RUD! Minimum quality for the base
material "steel" has to be 1.0037 (St 37).
2
Lifting Points
5
Inspection criteria
After fitting, an annual inspection or sooner if conditions
dicate should be undertaken by a competent person
examining the continued suitability (at least once a year).
Also after damage and special occurrences:
• Ensure a tight bolt seat (possibly examine torque)
• Ensure that lifting point is complete
• Complete indications of WLL and manufacturer
• Deformations at bearing parts such as body, suspension
bracket or latch
• Mechanical damages such as serious notches,
especially in high stress areas
• Reductions of cross section by wear > 10 %
• Strong corrosion (pitting)
• Cracks at bearing parts
• Cracks or other damages at the weld (with lifting points
for weld on)
• Correct bolt size, bolt quality and thread length
• Function and damage of bolts as well as bolt thread
• With rotating lifting points: easy, jerk free turning between
upper and lower part must be assured
• Assembly or fitting of different bolt lengths with types
VWBG-V or WBG-V only to be carried out by the
manufacturer.
For the user it is forbidden to disassemble the ball
bearing of VWBG-V, VWBG, WBG-V, WBG, PP and
WPP.
• With types PP, WPP, VWBG-V, VWBG, WBG-V and
WBG check maximum slackness between upper and
lower part below, size „s" – refer to table. In case the
maximum slackness has been exceeded, these types
must be taken out for service or replacement.
Type
WPP / PP-..-0.63t to 2.5t
WPP / PP-..-4t to 8t
VWBG-V 0.3 to 0.45
VWBG-V 0.6 to 2.0
VWBG-V 3.5 to 5.0
VWBG 8 to 40
Pic. 1: Distance „s" between upper and base part
Slack „s"
max. 1.5 mm
max. 2.5 mm
max. 1.2 mm
max. 1.5 mm
max. 3.0 mm
max. 4.0 mm
S
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