How Blind Fasteners Work

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How Blind Fasteners Work

How Blind Fasteners Work

Huck’s pre-assembled, one-piece blind fasteners are ideal when access from only one side of the joint material is available. The blind fastener is placed in a pre-drilled hole and is installed by using an installation tool to pull the mandrel or pin head into the rivet body, expanding the rivet body and causing it to flare on the blind side of the joint material creating a permanent and vibration resistant fastening. Installation is typically complete in 1 second.

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Blind Fasteners

The shear strength of structural blind fasteners is generated by the combined resistance against failure of the pin and sleeve. This takes place along the joint shear line between fastened plates.The shear strength of structural blind fasteners is generated by the combined resistance against failure of the pin and sleeve. This takes place along the joint shear line between fastened plates.

The tensile strength of structural blind fasteners differs to that of LockBolts, as they form a blind side positive lock either by bulbing or expanding of the sleeve. The sleeve, assisted by the permanently secured pin, therefore resists failure along its centre line.

1. Bulbing
The sleeve of the fastener is compressed, causing it to fold outwards to form a bulb. This forms itself tightly against the joint material. Once the pin is permanently locked into place the pintail will break off, completing the installation.

2. Expanding
Pulling on the pintail causes the head of the pin to draw into the sleeve. This expansion causes a foot print to form against the joint material.

Note: The pre-load of blind rivets is generally not published, as it varies widely depending on the application.