Blind Rivet Nuts

THE SETTING PROCESS

A

Spin on

B

Insert

C

Upset

D

Spin off

Excess length threaded mandrel = minimum one thread turn

Goebel favours the spindle stroke procedure. For setting, the blind rivet nut has to be screwed onto the mandrel of the tool, inserted into the drilled hole of the component and then fixed by activating the tool. In doing so the closing head of the blind rivet nut will be formed. After unscrewing the blind rivet nut, the components can be screwed together.

Processing notes and recommendations

We recommend using preferably blind rivet nuts with knurled or hexagonal body in order to eliminate the risk of rotation.

It must be ensured that the components cannot rotate against each other. Only a minimum gap is allowed between the components to be connected.

Prior to the setting of blind rivet nuts series, determine the optimal settings for your setting tool (stroke setting and/or force setting) conducting a mounting test.

THE SETTING PROCESS

1

2

3

4

5

THE SETTING PROCESS is the most typical and multifunctional form. The gap C between components A and B can be brought down to 0 by deep-drawing of the sheet (Fig. 1). The blind rivet nut can be also used just as a rivet connection (Fig. 2).

The countersunk head generally requires that the component on the rivet head side is slightly counter-bored and is a little bit less than the countersunk head itself (C > 0). That way the head rivet nut minimally protrudes component B and contacts component A. A countersunk head is used when a small countersunk head is not applicable (Fig.3).

The small countersunk head is an optimised version of the countersunk head. In most cases, it is not necessary to countersink the receiving hole on the rivet head side. The small countersunk head is used when the gap C should be low or reduced to zero. (Fig.4) This takes place through: - utilisation of a punching rim - slight countersinking of B On soft materials, the gap C is automatically reduced to zero. (Fig.5) The small countersunk head should not be used when: - the receiving hole is not precisely within the tolerance dimensions - the material being installed is ductile (the head glides through component) - the screw exerts an overturning moment on the blind rivet nut

SELECTION OF THE BLIND RIVET NUT AND BOLT DEPENDING ON THE COMPONENT

Measure the material thickness of the components to be riveted. This measure must be within the grip range of the blind rivet nut (min. GR – max. GR).

If one includes the allowed tolerance ranges and if this results in 2 blind rivet nuts for selection, proceed as follows: For hard components, the shorter blind rivet nut with the smaller grip range is to be used. => For example, in case of approx. 3 mm material thickness one should use 7550800000 instead of 7550800001.

For soft components, the longer blind rivet nut with the larger grip range is to be used. => For example, in case of approx. 3 mm material thickness one should use 7550800001 instead of 7550800000.

A relatively broad upset metal is necessary for components made of plastic and soft materials (e.g. aluminium) in order to achieve correspondingly high mechanical values. For that we recommend our special product lines with peel blind rivet nuts GO-SPLIT and GO-FOUR.