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Linear Motion & Precision Technologies
H Y D ROCAM Bolt Te n s i o n e rs
I n d u s t rial Tightening Systems
The SKF Group
The SKF Group is an international
industrial corporation owned by
SKF Sweden AB. Founded in 1907,
it operates in 130 countries and has
some 40000 employees.
The company has over 80 manufacturing
units throughout the world and
a network of nearly 20000 distributors
and retailers. SKF is the world leader
in the rolling bearing business.
SKF Linear Motion &
Precision Technologies
SKF Linear Motion & Precision
Technologies is an organization within
SKF which, as the name suggests,
is dedicated to the manufacture, sales
and service of linear motion products,
high precision bearings and spindles.
It serves the market through its
organization of 15 specialized sales
companies located in Europe,
North America and Japan.
In addition to the services provided
by these sales companies, product
and application support is available
worldwide through the SKF international
n e t w o r k .
Specialized Linear Motion
& Precison Te c h n o l o g i e s
Sales Companies
SKF Bearing sales
companies with Linear
Motion sales staff
Production facilities
Catalogue n° TSI 1102 AE
April 2001
Printed in France
© Copyright SKF 2001
The contents of this catalogue are
the copyright of the publishers and
may not be reproduced (even extracts)
without permission. Every care has
been taken to ensure the accuracy
of the information contained in this
catalogue but no liability can be
accepted for any errors or omissions.
Earlier catalogues with data which is
d i fferent than that contained herein are
no longer valid.
We reserve the right to make
changes required by technological
d e v e l o p m e n t s .
Introduction
2
What makes up the HYDROCAM bolt tensioner
4
How a HYDROCAM tensioner works
5
Optimize your bolted assembly
6
Choose the best tightening solution
8
Recommendations for using HYDROCAM tensioners
10
Unit conversion
12
Torque/Tightening loads tables
13
Tables: Tension loads
26
Standard product range
29
30
Hydraulic force diagrams for standard tensioners
32
Summary Table: Standard tensioner characteristics
34
HTA: Multi-purpose
36
HTS: Small
38
HTS N: Thin
40
HTS 2: Thin and powerful
42
HTC R: Compact and powerful
44
HTH R: Thin and super-powerful
Customized standard tensioners
46
Special Tensioners
48
Special machines and control systems
50
Applications
52
Company resources and organization at the client’s service
54
SKF Equipements’ Services
56
Tensioner accessories
58
The BoltSafe sensor washer
62
Glossary of terms
68
Conclusion
69
Price request fax form
70
HYDROCAM tensioner information fax form
71
Introduction
SKF
®
has worked in the field of bolt-tightening by pre-load tension since the 1940’s.
At that time, design studies concentrated on the tightening of slewing rings,
where the SKF group’s subsidiary, RKS, is a leading specialist.
Since the 1940’s, SKF Equipements has continuously furthered its bolt-tightening experience
in every industrial sector and in many different types of applications.
Today, SKF Equipements offers two descriptive documents on the subject of
bolt-tightening: the “Bolt-tightening Handbook”, which discusses the technical aspects
of bolt-tightening, and this product catalogue: the “HYDROCAM
®
Bolt-Tensioner -
Industrial Tightening Systems” catalogue.
Well aware that good tightening control is extremely important economically,
SKF Equipement offers both expertise and service to solve any problems involving
the tightening of bolted assemblies.
Screw and nut
Stud with nut on one end
Stud with nuts on both ends
Just what is a bolted assembly ?
A bolted assembly quite simply means the putting toge-
ther of at least two parts using one or several bolts. As
is shown in the figure above, these bolts can be made
up of screws and nuts, studs with nuts on one or both
ends, and possibly washers.
The design and implementation of a bolted assembly
requires a very strict methodological approach, for
errors can lead to costly and often disastrous failures.
Several studies have shown that incidents encountered
on bolted assemblies are most often due to improper
design of the assembly (analysis, design, calculation,
component choice) or poor implementation (tightening
method, tooling, inspection).
In the following document, the word “bolt” includes these
three types of screwing components.
Bolted assemblies are the most commonly used
connecting systems in mechanics. And although they
appear to be quite simple, bolted assemblies do pose
several challenges at many levels: design department,
assembly workshop, on-site, and maintenance.
Today it is known that of all the various causes of failure
(overloading, design flaws, manufacturing defects, and
others), the most frequent is improper assembly.
Tightening problems, whether insufficient tightening,
excessive tightening or heterogenous tightening, alone
account for over 30% of all bolted assembly failures.
Rough dimensioning methods are too often applied at
the design stage, which leads to unnecessary oversi-
zing. Such oversizing does not enhance product safety,
quite the contrary...
2
More specifically, 45% of all fatigue failures are estimated to be due to improper
assembly.
Therefore, the importance of the design of the bolted assembly and the means used
to tighten it are of utmost importance.
The “Bolt-tightening Handbook” clearly explains that “optimum tightening means a
bolt which is not too tight and not too loose” and shows how to achieve the best
tightening.
It reviews all the tightening methods and proves that the best tightening control is
provided by the Hydrocam hydraulic tensioner.
This “Product Catalogue” describes all the products and services that SKF offers
in order to enable you to better manage your bolted assemblies.
Both of these documents provide indispensable information on optimizing the
bolted assemblies that you are designing and on choosing the best tightening
method for your application. They describe the key aspects, which are:
• Quality
• A c c u r a c y
• Homogeneity
• Ease of use
These provide additional advantages such as:
• Reliability and safety
• Optimized dimensions
• Time savings
• Cost reduction in use,
control and maintenance.
In addition, this catalogue provides
other useful information such as
standard bolting dimensions, units
conversion, and the conversion of torque
into tension load...
As an example - did you know that
the SKF hydraulic tensioner can tighten
bolts from 5 to 500 mm ?
Please do not hesitate to contact SKF
for your needs. You may be surprised
by all the services SKF can provide
in the field of bolted assembly tightening.
3
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