NP
Contact us You can contact us using any of the methods below. Unit 3 Durham Lane Armthorpe Doncaster South Yorkshire DN3 3FE England +44 (0)1302 836010 +44 (0)1302 836012 sales@npfasteners.com
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NORTHERN PRECISION LTD
Accreditations Northern Precision Ltd operate a quality management system in accordance with ISO 9001:2008. The ISO 9001:2008 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.
Registered in England & Wales Company number 3275391
V.A.T Registration number GB 684 1384 17
NP
NORTHERN PRECISION LTD
Specialist Fasteners for Sheet Metal
+44 (0) 1302 836010
+44 (0) 1302 836012
Tel:
Fax:
sales@npfasteners.com
Quality
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Testing Method
Hardened bush. A minimum of 6 fully engaged threads is recommended on both sides.
Test panel held firmly in vice.
Applied torque from dial measuring torque wrench.
Minimum grade 5 bolt (grade 8 for NHTS & NHFE fasteners).
Hardened bushing with sufficient wall thickness to withstand applied compression load.
Head Dia. + 1.6mm
Test panel.
Applied Load from compression gauge.
Compression rig base.
Push-out testing of Self-Clinching High Strength Studs should be performed by the gradual application of a load as shown above. Bushing height should be sufficient to allow free downward movement of the stud during testing. The bushing bore must be centred on the head of the stud.
Torque-out testing of Self-Clinching High Strength Studs should be performed by the gradual application of torque as shown while the test panel is securely held in a vice. The bolt must be of a sufficient grade to resist thread stripping. Torque must be gradually applied until failure is observed and a maximum applied torque reading is recorded. Failure mode is the stud turning in the panel, cam-out, or dependent on stud type/size, thread failure.
Performance
Thread size
Max. nut tightening Torque (Nm)
M5
4.4
Installation (kN)
11.8
13.2
25.0
23.2
Pushout (N)
750
800
1500
1500
Torque-out (Nm)
5.5
5.6
7.8
7.5
Fastener Type
NHTS (ZI)
NHTS (A2)
NHTS (ZI)
NHTS (A2)
Aluminium
Test sheet material
Steel
15.5
1110
3.4
NHTS (PB)
3.47
Copper
M6
10.0
19.7
17.2
31.3
28.4
1300
1250
1800
1750
12.0
11.5
14.5
13.5
NHTS (ZI)
NHTS (A2)
NHTS (ZI)
NHTS (A2)
Aluminium
Steel
23.0
1600
6.9
NHTS (PB)
5.9
Copper
M8
21.7
32.1
30.4
43.5
39.8
1750
1700
2250
2150
28.5
22.5
31.0
25.5
NHTS (ZI)
NHTS (A2)
NHTS (ZI)
NHTS (A2)
Aluminium
Steel
32.7
2250
15.0
NHTS (PB)
14.3
Copper
M10
36.6
52.1
48.2
76.5
65.8
2500
2450
3500
3450
36.0
35.0
50.0
38.0
NHTS (ZI)
NHTS (A2)
NHTS (ZI)
NHTS (A2)
Aluminium
Steel
50.3
2500
25.0
NHTS (PB)
28.5
Copper
All performance figures are averages obtained over a range of installations and should be used as an indicator only. Panel material, hole preparation, installation tooling and method can affect part performance. We always recommend that you carry out your own tests in the actual application. Please call our sales team and we will be happy to provide you with samples as well as offering technical assistance.
Anvil Dimensions
C +0.2
9.80
8.20
12.90
A +0.08
6.03
5.03
8.03
Thread size
M6
M5
M8
B +0.02
1.14
0.94
1.62
16.10
10.03
M10
2.10
Pocket punch detail. Pocket provides clearance for head protrusion, minimising risk of over installation.
First punch or drill the correct size hole. Do not deburr or chamfer the hole prior to installation as this will remove material required during the clinching process. It is preferable to install the fastener from the punch side of the panel.   Place the fastener in the prepared hole in the panel and then locate the fastener in the anvil like in the diagram above.   With the panel held level, apply a parallel squeezing force until the castellations are fully embedded in the panel. This fastener is not designed to install flush, correct installation should leave the head protruding slightly (refer to S dimension). Do not over install the fastener into the panel as this will result in panel deformation.   When installing Self-Clinching fasteners, please pay attention to the minimum hole centreline to edge and parent material hardness limitations.
√  X
Do not remove any extra material or chamfer the hole as this could result in improper installation or reduced performance.
HRB (ROCKWELL HARDNESS B SCALE) Ensure that you are installing into a panel that is ductile and at or below the published maximum recommended hardness for the fastener.
Ensure that attention is paid to the minimum hole centreline to edge dimension for each fastener. Installing too close to an edge or bend could result in improper installation or reduced performance. Minimum centreline to edge dimensions shown for each fastener apply to one edge only. If this distance is applied on multiple sides there will be significant panel distortion unless the panel edges are supported during installation.
X  √  Min C/L to Edge Min C/L to Edge
Material & Finish
Electro Zinc Plated through-hardened Steel (ZI) parts are suitable for installation in ductile panels with a maximum recommended hardness of 85 HRB. 300 Series Stainless Steel (A2) parts are suitable for installation in ductile panels with a maximum recommended hardness of 70 HRB. Phosphor Bronze (PB) parts are suitable for installation in ductile panels with a maximum recommended hardness of 55 HRB.
Part Number Examples
Part number is made up as follows: (Type)-(Thread)-(Length)-(Material/Finish code) For example: NHTS-M6-20-ZI (Heavy Duty Stud-M6-20mm long-electro zinc plated through-hardened steel) NHTS-M8-25-A2 (Heavy Duty Stud-M8-25mm long-stainless steel) NHTS-M8-30-PB (Heavy Duty Stud-M8-30mm long-phosphor bronze) Use part designation NHTSD to specify a dog-point thread lead-in (special order).
RoHS REACH COMPLIANT
Info
Self-Clinching High Strength Studs provide high strength captivated male threads in thin panels. This fastener does not install fully flush on the underside of the panel. Utilising a special proven castellated clinch feature, this fastener has very high torque-out, pull-through and push- out characteristics whilst providing minimal protrusion on the underside of the panel (refer to S dimension). Like all self clinching fasteners they are installed using a parallel squeezing action, so require access to both sides of the panel.   High Strength Studs are available in a range of thread sizes and lengths, manufactured from electro zinc plated through-hardened steel, 300 series stainless steel, phosphor bronze and are suitable for installation in ductile panels with a recommended maximum hardness of 85 HRB for steel parts, 70 HRB for 300 series stainless steel parts and 55 HRB for phosphor bronze parts. High Strength Studs can also be supplied with a dog-point thread lead-in to aid component assembly.
Installation
Self Clinching High Strength Studs
Type NHTS
SELF-CLINCHING HIGH STRENGTH STUDS
self-clinching high strength studs
A
Length of stud +3.2mm min.
ANVIL PUNCH ANVIL PUNCH C B