I... Glossary of Fastener and Fixing Terminology
GLOSSARY ALPHA LOCATOR
A wrench, usually powered by electricity or air, in which repeated blows from little hammers are used to generate torque to tighten fasteners. The torque applied to the fastener depends upon the time and the air pressure applied to the tool (for pneumatic wrenches). The torque applied by an impact wrench to a fastener is influenced by the joint stiffness.
INSTANTANEOUS CENTRE OF ROTATION
The point in space that an eccentrically shear loaded joint rotates about. The deformation and the load sustained by an individual bolt in a bolt group is dependent upon the distance that the bolt is from the instantaneous centre. The direction that the individual bolt force acts is perpendicular to a line joining that bolt to the instantaneous centre.
A term used to describe types of fasteners which are highly resistant to vibration loosening or removal. Some types have special thread forms.
ISIR INITIAL SAMPLE INSPECTION REPORT
Submission of a sample batch or a consignment of components for approval.
ISO INTERNATIONAL ORGANISATION FOR STANDARDISATION
A worldwide federation of national standardisation bodies, their standards are prefixed with the letters ISO.