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
Dimensional
Material & Finish
Zinc Plated Carbon Steel + Dry Film Lubricant coating (MD) parts are suitable for
installation in ductile panels with a maximum recommended hardness of 70 HRB.
300 Series Stainless Steel + Dry Film Lubricant coating (A2) parts are suitable for
installation in ductile panels with a maximum recommended hardness of 70 HRB.
Aluminium (AL) arts are suitable for installation in ductile panels with a maximum
recommended hardness of 50 HRB.
Part Number Examples
Part number is made up as follows:
(Type)-(Thread)-(Material code)-(Material/Finish code)
For example:
LCN-M3-1-MD (Locking Nut-M3-1.0mm min sheet thickness-zinc plated carbon steel plus
Dry Film Lubricant coating)
LCN-M4-2-A2 (Locking Nut-M4-1.4mm min sheet thickness-stainless steel plus Dry Film
Lubricant coating)
LCN-M5-2-AL (Locking Nut-M5-1.4mm min sheet thickness-aluminium)
Info
Self-Clinching Locking Nuts provide strong female prevailing torque locking threads in panels that are too thin to be
conventionally tapped.
Utilising a special proven clinch feature, this fastener has excellent torque-out and push-out characteristics whilst
providing a flush finish on the underside of the panel.
Featuring two symmetrically threaded jaws and a dry film lubricant coating to provide a strong and effective
prevailing torque locking action to minimise the risk of loosening when under heavy usage.
Like all self clinching fasteners they are installed using a parallel squeezing action, so require access to both sides of
the panel.
Locking Nuts are available in various thread sizes, manufactured from zinc plated steel and 300 series stainless
steel plus a dry film lubricant coating and are suitable for installation in ductile steel and aluminium panels with a
recommended maximum hardness of 70 HRB and aluminium with no dry film lubricant which are suitable for
installation in ductile aluminium panels with a recommended maximum hardness of 50 HRB.
Thread
Size
Material
code
S
Max.
Hole size
+0.08 -0.0
C
Max.
D
Max.
Min sheet
thickness
Min .CL
to edge
of panel
1
1.0
0.97
2
1.4
1.38
4.73
4.85
4.75
4.0
M3 x 0.5
1
1.0
0.97
2
1.4
1.38
6.73
6.20
6.76
5.2
M4 x 0.7
1
1.0
0.97
2
1.4
1.38
7.90
7.75
7.92
5.6
M5 x 0.8
H
±0.40
3.43
4.45
5.21
Max. prevailing
locking torque
Nm (guideline)
0.56
1.70
2.00
F
Nom.
6.35
8.73
9.53
Type LCN
SELF-CLINCHING
LOCKING NUTS
