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
Capacitor Discharge Weld
Studs & Pins
Capacitor Discharge Weld
Standoffs
Capacitor Discharge Earth
Tags
Projection Weld Bolts & Pins
Hexagon Weld Nuts
Square Weld Nuts
Weldability cross reference
Base Panel Material
CD Weld Standoff Material
Mild Steel
Stainless Steel
Aluminium
Brass
Low Carbon Mild Steel
Steel up to 0.6% carbon
Austenitic Stainless Steel
Zinc coated Steel
Electro Galvanised Steel
Hot Rolled Steel
Aluminium Alloy
Pure Aluminium
Lead Free Brass
Leaded Brass
Lead Free Copper
Good
Fair
Good
Fair
Fair
Fair
Not Weldable
Not Weldable
Good
Not Weldable
Fair
Good
Good
Good
Fair
Fair
Fair
Not Weldable
Not Weldable
Fair
Not Weldable
Fair
Not Weldable
Not Weldable
Not Weldable
Not Weldable
Not Weldable
Not Weldable
Good
Good
Not Weldable
Not Weldable
Not Weldable
Good
Good
Fair
Good
Good
Fair
Not Weldable
Not Weldable
Good
Not Weldable
Good
Weld Gun
Standoff
Base Panel
Standoff in place
with Initial
pressure provided
by gun on base
panel.
Insert standoff
into gun and
position on panel
Press
trigger
Welding
cycle
Release
Standoff is now
welded in place
Stored energy is
discharged as a
high current pulse.
The high current
melts the pip on
the head and
produces an arc.
Return spring
pressure presses
the standoff into
the molten
surface and fuses
the base of the
standoff with the
base panel.
Perform your
preferred tests to
confirm correct
weld formation
and ensure
standoff meets
required
performance
criteria.
~0.04
seconds
1
2
3
4
Material & Finish
Copper Coated Steel (CP)
Stainless Steel (A2)
Aluminium (AL)
Brass (BR)
Part Number Examples
Part number is made up as follows:
(Type)-(Thread/Dia.)-(Length)-(Material/Finish code)
For example:
WSO-M4-8-CP (CD Weld Standoff-M4-8mm long-copper coated steel)
WSO-M5-12-A2 (CD Weld Standoff-M5-12mm long-stainless steel)
Downloadable Data Sheet
Back
Installation and materials compatibility
Dimensional
Thread
Size
M3 x 0.5
M4 x 0.7
M5 x 0.8
M6 x 1.0
D
±0.2
6.5
7.5
9.0
10.5
H
0.8 - 1.4
0.8 - 1.4
0.8 - 1.4
0.8 - 1.6
L ±0.5
6
-
-
-
8
8
-
-
10
10
10
-
12
12
12
12
15
15
15
15
20
20
20
20
25
25
25
25
30
30
30
30
35
35
35
35
-
40
40
40
E
Min.
5.0
6.0
7.5
9.0
F
Ref.
2.5
3.0
3.0
3.0
B
±0.1
5.0
6.0
7.0
8.0
±0.4
Preferred lengths shown. Other lengths available to order.
Info
The capacitor discharge (CD) process is suitable for attaching smaller diameter fasteners to thin sheet metal
applications. The weld cycle is completed in milliseconds meaning that weld can be achieved without generating
pronounced distortion or discolouration on the reverse side of the panel.
CD standoff welding is a versatile single fastening process where internally threaded standoffs can be end joined to
a sheet metal application instantaneously.
Internally threaded CD Weld Standoffs are available in a range of thread sizes and lengths, manufactured from
copper coated steel, stainless steel, aluminium and brass and are suitable for use with compatible panel materials
as thin as 0.5mm. CD Weld standoffs require appropriate stud welding equipment for attachment.
CAPACITOR DISCHARGE
(CD) WELD STANDOFFS
