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
Round Rivet Bush Serrated
Shoulder
Round Rivet Bush Knurled
Spigot
Hexagon Rivet Bush
Round Rivet Bush for Clinch
Nut Hole Size
Mini Rivet Bush Serrated
Shoulder
Mini Rivet Bush Knurled
Spigot
Round Rivet Bush Standoff
Serrated Shoulder
Round Rivet Bush Standoff
Knurled Spigot
Mini Rivet Bush Standoff
Serrated Shoulder
Mini Rivet Bush Standoff
Knurled Spigot
Tank Closed End Rivet Bush
Panel Thickness Gauge Chart
Installation Method
Punch or drill specified hole size.
Ensure that you are using the
correct gauge fastener for the
panel thickness used.
Place part in anvil and locate panel
hole over spigot.
Using a profiled punch, ensuring
panel is held perpendicular to the
punch and anvil face, apply a
parallel squeezing force to form
the correct spigot profile.
Alternatively, a domed anvil or a
ball bearing and hammer can be
used to form the spigot profile,
however this will not give
optimum performance.
For optimum performance, installing with a profiled punch is
highly recommended. A flat punch can also be used but will result
in reduced push-out performance.
Thread
size
Torque to Turn (Nm)
Push-Out (N)
20swg
18swg
16swg
14swg
12swg
10swg
20swg
18swg
16swg
14swg
12swg
10swg
M2.5
M3
M3.5
M4
M5
M6
M8
1.0
1.0
2.2
2.2
4.7
6.2
7.6
1.3
1.3
2.6
2.6
5.1
6.5
8.2
1.6
1.6
3.3
3.3
5.4
6.9
8.6
2.0
2.0
3.7
3.7
5.7
7.5
9.1
2.3
2.3
4.2
4.2
6.0
7.9
9.8
2.5
2.5
4.5
4.5
6.5
8.5
10.7
900
900
1000
1000
1050
1150
1350
1050
1050
1150
1150
1300
1450
1800
1200
1200
1300
1300
1500
1700
2400
1300
1300
1450
1450
1700
2100
2700
1500
1500
1600
1600
1850
2400
2950
1600
1600
1700
1700
2000
2650
3200
Performance
All performance figures are averages obtained over a range of installations for steel parts in mild steel panels and should be used for guidance
only. Fastener material, panel material, hole preparation, installation tooling and method can affect part performance. Actual in-use torque to
turn resistance increases with clamping load. 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.
Material & Finish
Unplated Steel (GX)
Electro Zinc Plated Steel (GZ)
303 Stainless Steel (GS)
316 Stainless Steel (A4)
Aluminium (GA)
Brass (GB)
Part Number Examples
Part number is made up as follows:
(Type)-(Thread code)-(Panel thickness)-(Material/Finish code)
For example:
BMHK-M4-18-GZ (Mini Rivet Bush Knurled Spigot-M4-18swg sheet thickness-
electro zinc plated steel)
BMHK-M5-20-GS (Mini Rivet Bush Knurled Spigot-M5-20swg sheet thickness-
stainless steel)
Dimensional
Info
Mini Rivet Bushes provide strong reusable captivated threads in panels too thin to be conventionally tapped.
They can be installed into panels as thin as 0.5mm and do not suffer from the maximum hardness or centreline to
edge limitations of self-clinching nuts so are suitable for installation into panels of any hardness such as hard
stainless steels or in close to edge applications.
Featuring a knurled spigot,this style of smaller rivet bush offers good torque to turn resistance while maintaining
good spigot strength to resist push-out.
Manufactured to suit a specific panel thickness, we can manufacture parts with custom dimensions to suit your
particular application.
Available from stock in metric thread sizes in steel, electro zinc plated steel and stainless steel. We can also supply
Unified, BA, BSW and BSP thread sizes subject to minimum order quantities.
316 stainless steel, aluminium and brass rivet bushes are available to order subject to minimum order quantities.
Ideally Rivet Bushes should be installed using a press with a suitability profiled punch by applying a parallel
squeezing force, however they can be installed using a hammer and ball bearing to form the spigot profile.
MINI RIVET BUSH
KNURLED SPIGOT
