EGC - RotaBolt How it works
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A gauge pin of the same basic material as the parent fastener is positively anchored in a short central drilling. The Rota-load indicator, which is free to rotate on the pin, is set at a prescribed air-gap to the head of the machined fastener. The dimension of this air-gap is set according to the percentage yield stress selected.

The assembly is protected from contamination by a control cap which clips securely on the Rota-load indicator. It is this knurled cap which may be rotated by finger-tip when the fastener is not fully stressed. Within the cap, the integrity of key components is maintained by a specially compounded grease.

When the fastener is loaded, the air-gap closes down as a result of the small stretch that occurs. At the point where the Rota-load indicator may no longer be rotated by finger-tip, the correct load setting has been achieved.

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