Tappex Grooved Pins0 pages
Why Use Grooved Pins ?
Simple Hole Preparation
Resistance To Shock And Vibration
Total Range
They Are Reusable
Simple Installation
Strength
No reaming or threading of the hole prior to installation is required
Because the pin is held in position under elastic tension it cannot easily be dislodged in harsh
environments.
Standard pin types are available for many applications eliminating the need for more labour
intensive or complex fasteners, or custom designed expensive parts.
When removed from the application the grooves recover their form and can be reused many times
with only minimal reduction in pull out performance.
Providing correct procedures are followed (see below) there is no need for special installation
equipment for small volumes. Where high production quantities are anticipated the pin can easily
be fed and does not require sophisticated installation equipment.
The Tappex Grooved Pin is a solid steel fastener giving high shear strength and good wear
resistance.
Installation Information
Hole Preparation
Pin Strength
Installation
When drilling the hole for installation of a grooved pin a standard twist drill should be used of the
same nominal diameter as the ungrooved pin. Hole tolerance H9 for pins under 3mm and H11 for
3mm and above although in steel a slightly larger hole will only marginally affect withdrawal loads.
Tappex Grooved Pins are produced with a minus tolerance on the ungrooved diameter to allow an
easy fit.
The tensile strength of the pin must be the same as or higher than the strength of the component
material.
Parallel groove pins require significantly higher installation forces than tapered groove pins. To
eliminate the chance of any difficulty during installation a 60° counter sink should be incorporated
into the hole and the pin should be slightly lubricated prior to installation. During installation it is
important to ensure correct alignment between the pin and the hole.
Installation Forces
These figures give data on average installation forces required
for tapered and parallel grooves.
Generally the force to remove a pin is slightly more than the
force required to install it.
Tapered Grooves - insertion force in kgs per length of groove.
Norn. dia. mm. | 1.5 | 2 | 2.5 | 3 | 4 | 5 | 6 | 8 | |
Groove length | 6mm | 23 | 30 | 37 | 64 | 95 | 132 | 223 | |
12mm | 50 | 64 | 82 | 128 | 186 | 255 | 418 | 609 | |
18mm | 73 | 91 | 123 | 186 | 273 | 368 | 600 | 664 | |
24mm | 94 | 128 | 164 | 255 | 364 | 482 | 770 | 1118 | |
36mm | 523 | 686 | 1064 | 1518 | |||||
48mm | 682 | 891 | 1345 | 1918 | |||||
60mm | 2395 | ||||||||
72mm | 2864 |
Parallel Grooves - insertion force per mm of groove
kgs. | 9 | 11 | 13 | 17 | 22 | 28 | 40 | 55 |
Product Identification
The part number is made up of the nominal diameter and
effective length. The example shown here is for Grooved Pin S8
- third length centre tapering grooves - DIN 1475. A standard part
number assumes a plain steel material. Other materials should
be noted at the time of specifying by quoting the appropriate
material reference (see page 7).
058 3 25
Product Type diameter
(i.e. Grooved Pin S8) (d, = 3mm)
length
(/=25mm)
■rappex
"