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
Material & Finish
Electro Zinc Plated Steel (ZI) parts are suitable for installation in ductile panels with a
maximum recommended hardness of 60 HRB.
Stainless Steel (A2) parts are suitable for installation in ductile panels with a maximum
recommended hardness of 70 HRB.
Aluminium (AL) parts 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)-(Mounting Hole Size)-(Length)-(Material/Finish Code)
For example:
QRSO-4MM-10-A2 (Quick-release standoff-4.0mm top hole-10mm long-stainless steel)
QRSO-4MM-12-AL (Quick-release standoff-4.0mm top hole-12mm long-aluminium)
QRSO-4MM-8-ZI (Quick-release standoff-4.0mm top hole-8mm long-electro zinc plated
steel)
Self-Clinching Quick-Release Standoffs reduce the time and costs associated with traditional assembly methods for
panel spaced applications, such as mounting and detaching PC boards, panels, or components easily without
requiring any tools or additional hardware.
This fastener can also reduce or eliminate the risks associated with loose hardware potentially damaging internal
circuitry.
Utilising a special proven clinch feature, once installed this fastener provides a flush finish on the underside of the
panel, meaning that minimal surface finishing is required after installation. Suitable for installation in steel and
aluminium panels as thin as 1mm, the quick-release end is suitable for any panel material from 1.0mm to 1.8mm
thick.
Like all self clinching fasteners they are installed using a parallel squeezing action, so require access to both sides of
the panel.
Self-Clinching Quick-Release Standoffs are available in a range of lengths, manufactured from electro zinc plated
carbon steel, stainless steel, aluminium and are suitable for installation in ductile panels with a recommended
maximum hardness of 60 HRB for steel parts, 70 HRB for stainless steel parts and 50 HRB for aluminium parts.
Dimensional
Info
Type QRSO
SELF-CLINCHING
QUICK-RELEASE
STANDOFFS
Min. CL1
to edge
Hole Size
+0.08
-0.00
Min. Panel
Thickness
Panel
Material
Location
Tolerance
5.41
Bottom Panel
Min. CL2
to edge
Hole Size
+0.08
-0.00
Panel
Thickness
Range
Panel
Material
Max.
Hardness
4.0
Top Panel
1.0
Metal
6.60
±0.13
1.0 - 1.8
Any
2.54
No Limit
Lengths (L) ±0.13
H
±0.13
D
±0.13
E
±0.13
B
Max
8
10
12
14
16
20
18
22
25
4.78
3.58
6.35
5.39
