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.

Parallel Grooves - insertion force per mm of groove

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