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NP
NORTHERN PRECISION LTD
Specialist Fasteners for Sheet Metal
+44 (0) 1302 836010
+44 (0) 1302 836012
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Sleeved Anvil
d3 d2 L Tube Insert Punch d1 5 d3 1 - 0.1 L 10 5 d2 d1 + 0.2
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
RoHS REACH COMPLIANT
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
ITT2Q  M8 47.5
ITT2Q  M8 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
d3 I/D d1 L