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of the methods below.
Unit 3 Durham Lane
Armthorpe
Doncaster
South Yorkshire DN3 3FE
England
+44 (0)1302 836010
+44 (0)1302 831555
sales@npfasteners.com
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© Northern Precision Ltd.
NORTHERN PRECISION LTD
Accreditations
Northern Precision Ltd operate a quality management
system in accordance with ISO 9001.
The ISO 9001 standard is recognised worldwide and
you can be assured of the benefits of working with a
certified company knowing that our management
systems are constantly assessed and improved.
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RoHS|WEEE Compliance
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Conflict minerals
statement
Environmental Policy
Opening Hours
Mon - Fri 08:00 - 17:00
Registered in England & Wales
Company number 3275391
V.A.T Registration number
GB 684 1384 17
NORTHERN PRECISION LTD
Specialist Fasteners
for Sheet Metal
+44 (0) 1302 836010
+44 (0) 1302 831555
Tel:
Fax:
sales@npfasteners.com
Quality
Service
Reliability
Self-Clinching Fasteners
Broaching Fasteners
Arnold & Shinjo Fasteners
Rivet Bushes
Rivet Nuts
Weld Fasteners
Cage Nuts
Blind Rivets
Inserts for Plastics
Inserts for Stone, Solid
Materials, Composites &
Sandwich Panels
Fast-Con
Installation Equipment
Turned & Cold Formed
special parts made to order
Bespoke fastener design &
development
Fastener & Application
testing
Technical support
ISO 9001
RoHS|WEEE Compliance
REACH Compliance
Conflict minerals
Environmental Policy
SERVICES & SUPPORT
Crown-nuts
Crown-nut Round
Crown-nut Round Headed
Crown-nut Round Headed -
for Push Fit Castors
Crown-nut Square
Crown-nut Square Headed
Crown-nut Square Headed -
for Push Fit Castors
Sleeved Anvil
Un-Headed Crown-Nut Installation
1) Fabricate a punch appropriate for the type of Crown-Nut and the depth of installation required.
2) Ensure that the receiving tube is firmly secured.
3)
Place
the
Crown-Nut
inside
the
punch,
making
sure
that
the
crowns
are
orientated
correctly,
(bent towards the punch, as shown).
4)
Place
the
Crown-Nut
and
punch
assembly
on
the
head
of
the
tube.
It
is
important
that
the
end
of
the
tube
is
a
uniform
shape
and
cut
perpendicular
to
the
side
of
the
tube,
as
any
cutting
errors
will
be detrimental to the fit and function of the
Crown-Nut
.
5) Gradually apply pressure until the end of the run and the punch bottoms out.
6) Remove the punch.
Material & Finish
Electro Zinc Plated Steel
Part Number Examples
ITT2S M6 19.5
2 crowns round type CROWN-NUT with an M6 thread,
suitable for round tube section with an internal dimension
ranging from 19.5mm to 20.9mm
ITT2S M10 26.0
2 crowns round type CROWN-NUT with an M10 thread,
suitable for round tube section with an internal dimension
ranging from 26.0mm to 28.0mm
Dimensional
Part Number
d3
(Crown Diameter)
I/D
(Tube Internal Size)
L
(Total Length)
Non-binding dimensions in mm.
It is advisable to carry out preliminary assembly tests to determine the size that gives optimal performance in your application.
Application & Installation
Ideal for applications subject to pull forces. Not
suitable for push loads. Not having a head allows
fitting of the Crown-nut insert inside the tube
section at your own defined depth.
Press fit: gradually increase pressure on the insert
until the required depth is reached. It is highly
recommended that a sleeved punch is used to
ensure the insert is installed squarely and at the
correct depth (see below).
d1
(Thread)
M6
M8
M10
12.8
13.6
14.7
14.7
17.0
18.1
18.7
19.7
21.0
21.7
11.8 - 12.2
12.6 - 13.2
13.2 - 13.8
13.8 - 14.2
15.2 - 16.1
15.7 - 17.1
16.4 - 17.7
17.9 - 19.3
18.9 - 20.2
19.5 - 20.9
12.5
10
12.5
12.5
10
9.4
9.5
9.5
9.5
11
23.2
24.6
25.4
26.6
27.6
28.4
30.6
31.8
33.8
17.0
21.4 - 22.4
22.1 - 23.4
22.7 - 24.0
24.6 - 25.6
25.3 - 26.6
26.0 - 28.0
28.4 - 29.8
29.8 - 30.8
31.7 - 32.9
15.2 - 16.1
10
10
10.5
9.5
10
10
11.5
10
13
12.5
18.1
18.7
20.0
21.5
23.4
25.4
26.5
27.6
28.4
30.6
15.7 - 17.1
16.4 - 17.7
17.9 - 19.3
19.5 - 20.9
21.4 - 22.4
22.7 - 24.0
24.6 - 25.6
25.3 - 26.6
26.0 - 28.0
28.4 - 29.8
12.5
12.4
13
14.5
13
14
13.3
13.5
13
15
31.8
33.6
37.0
39.0
41.3
43.5
20.3
21.0
21.7
23.2
29.8 - 30.8
31.7 - 32.9
34.8 - 36.1
36.0 - 38.0
38.4 - 40.4
41.4 - 42.4
17.9 - 19.3
18.9 - 20.2
19.5 - 20.9
21.4 - 22.4
14
15
16
15.3
15.5
16.4
13
12.5
12.5
13.5
25.0
26.2
28.9
30.7
33.8
37.3
39.0
41.6
50.0
60.0
22.1 - 23.4
24.6 - 25.6
26.0 - 28.0
28.4 - 29.8
31.7 - 32.9
34.8 - 36.1
36.0 - 38.0
38.4 - 40.4
47.5 - 48.8
56.0 - 58.0
14
13.8
15
13.5
14.3
16.5
15.2
16
17
16.8
ITT2S M6 11.8
ITT2S M6 12.6
ITT2S M6 13.2
ITT2S M6 13.8
ITT2S M6 15.2
ITT2S M6 15.7
ITT2S M6 16.4
ITT2S M6 17.9
ITT2S M6 18.9
ITT2S M6 19.5
ITT2S M6 21.4
ITT2S M6 22.1
ITT2S M6 22.7
ITT2S M6 24.6
ITT2S M6 25.3
ITT2S M6 26.0
ITT2S M6 28.4
ITT2S M6 29.8
ITT2S M6 31.7
ITT2S M8 15.2
ITT2S M8 15.7
ITT2S M8 16.4
ITT2S M8 17.9
ITT2S M8 19.5
ITT2S M8 21.4
ITT2S M8 22.7
ITT2S M8 24.6
ITT2S M8 25.3
ITT2S M8 26.0
ITT2S M8 28.4
ITT2S M8 29.8
ITT2S M8 31.7
ITT2S M8 34.8
ITT2S M8 36.0
ITT2S M8 38.4
ITT2S M8 41.4
ITT2S M10 17.9
ITT2S M10 18.9
ITT2S M10 19.5
ITT2S M10 21.4
ITT2S M10 22.1
ITT2S M10 24.6
ITT2S M10 26.0
ITT2S M10 28.4
ITT2S M10 31.7
ITT2S M10 34.8
ITT2S M10 36.0
ITT2S M10 38.4
ITT2S M10 47.5
ITT2S M10 56.0
Info
An Insert for use inside the end of round tube section
The Crown-nut is a revolutionary solution for the creation of a strong reusable female thread at the end of round or
square section tubes. Crown-nut solves the issue of how to securely fix to the end of tube section, guaranteeing
superior torque-out and pull-out performance. The product range offers solutions for round tube and square
section and is available in a wide range of sizes. A version is also available that is designed to accept push-fit castors.
Advantages of the Crown-nut
•
Can be installed into round tube section with a wide internal diameter tolerance range. Thanks to the
flexibility of the crown design, the same item code can be used for a range internal diameters.
•
The crown is designed so that the shape of the tube section is not altered during installation, guaranteeing
the aesthetics of the external surface.
•
Crown-nuts are easy to install and are cost effective. The press-in fit is fast and easy, enabling the elimination
of traditional and costly assembly processes such as welding and staking.
Note
After the insertion of the Crown Nut avoid heat treatments, galvanization and other heating operations that could
compromise the characteristics of the product.
Type ITT2S
CROWN-NUT
ROUND
