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 831555
sales@npfasteners.com
All rights reserved
© 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.
Regulatory
RoHS|WEEE Compliance
REACH Compliance
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
Crown-Nuts
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
Clinch Nuts
Flush Nuts
Blind Nuts
Miniature Nuts
Nyloc Nuts
Locking Nuts
Floating Nuts
Flush Head Studs
Flush Head Studs for
Stainless Steel
Reduced Flush Head Studs
Thin Panel Non-Flush Studs
High Strength Studs
Thin Panel High Strength
Studs
Flush Head Pins
Flush Head Tapered Pins
Concealed Head Studs
Through & Blind Standoffs
Grounding Standoffs
Thin Panel Standoffs
Quick Release Standoffs
Keylock Standoffs
Concealed Head Standoffs
Flush Panel Screw Assembly
Panel Fasteners
Phillips Head Panel Fasteners
Low-Profile Panel Fasteners
Plunger Assembly
Self-Clinching fastener
Do’s and Don’ts
Self-Clinching fastener
problem solving guides
Self-Clinch in harder panels
Testing Method
Push-out testing of Self-Clinching Miniature Nuts should be
performed by the gradual application of a load as shown.
Bushing height should be sufficient to allow free downward
movement of the nut during testing. The bushing bore must be
centred on the head of the nut.
Bolt (Grade 5 min.) Ensure
full thread engagement
before applying load.
Hardened bushing with
sufficient wall thickness
to withstand applied
compression load.
Collar Dia. (A)
+ 1.6mm
Test panel.
Compression rig base.
Bolt (Grade 5 min.) A minimum
of 2 threads should extend past
the end of the fastener.
Test panel held
firmly in vice.
Flat washer
2 pitch min.
Torque-out testing of Self-Clinching Miniature Nuts 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 nut turning in the panel or fracture of the knurled collar.
Performance
Thread
code
M3
M4
M5
Installation
force (kN)
7.7
8.5
8.9
2.3
6.8
7.9
Torque-out
(Nm)
1000
1285
1320
Push-out
(N)
Installation
force (kN)
11.8
12.2
13.1
2.3
6.8
7.9
Torque-out
(Nm)
1150
1298
1555
Push-out
(N)
1.5mm Steel test panel
1.5mm Aluminium test panel
Max. rec.
tightening
torque
for mating
screw (Nm)
1.13
2.3
3.12
Locking
torque
(15 cycle
range)
(Nm)
.056 - .56
.0169 - 1.69
.226 - 2.03
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.
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 anvil with the shank facing up like in the diagram above. Locate the panel mounting
hole over the shank ensuring the panel is held level.
With punch and anvil surfaces parallel, apply a squeezing force until the knurled collar is flush with the top of
the panel or the shank is flush with the bottom of the panel for thinner panels. Do not over squeeze the
fastener into the panel as this will result in panel deformation. It is important that a pocketed anvil is used so
that force is applied to the knurled collar rather than the head of the fastener.
When installing Self-Clinching fasteners, please pay attention to the minimum hole centreline to edge and
parent material hardness limitations.
L
Min.
5.2
4.6
5.5
A
+0.12
7.13
5.63
7.63
Thread codes
M4
M3
M5
Anvil Dimensions
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.
Installation
Material & Finish
Body
Electro Zinc Plated Carbon Steel (ZI)
300 Series Stainless Steel (A2)
Locking Element
White or Black Nylon (120°C max service temperature)
Parts are suitable for installation in ductile panels with a maximum recommended
hardness of 70 HRB.
Part Number Examples
Part number is made up as follows:
(Type)-(Thread)-(Material/Finish code)
For example:
NPL-M3-ZI (Nyloc Nut-M3-electro zinc plated carbon steel)
NPL-M5-A2 (Nyloc Nut-M5-stainless steel)
Info
Self-Clinching Nyloc Nuts provide strong female threads in panels that are too thin to be conventionally tapped. A
nylon element provides a reusable non-metallic prevailing torque locking feature suitable for use in service
temperatures up to 120°C.
Utilising a special proven clinch feature in combination with a radially knurled collar, this fastener has excellent
torque-out and push-out characteristics whilst providing a flush finish on the underside of the panel.
Like all self clinching fasteners they are installed using a parallel squeezing action, so require access to both sides
of the panel.
Nyloc Clinch Nuts are available in various thread sizes, are manufactured from electro zinc plated carbon steel and
300 series stainless steel and are suitable for installation in ductile steel and aluminium panels with a
recommended maximum hardness of 70 HRB.
Dimensional Data
Self-Clinching fastener
Do’s & Don’ts
Self-Clinching fastener
problem solving guides
Downloadable
Data Sheet
Back
Type NPL
SELF-CLINCHING
NYLOC NUTS
