KLIA-AirPort KL-Tower   Cyber Jaya Shah Alam Stadium KLCC-Twin Tower Port Klang-WestPort LRT Light Rail Transit-2

Terminology on topics related to;
nuts and bolts, threaded fasteners and tightening techniques

MAJOR DIAMETER - This is the diameter of an imaginary cylinder parallel with the crests of the thread; in other words it is the distance from crest to crest for an external thread, or root to root for an internal thread.

MEANSHIFT - The difference in tightening torque values produced by the same tightening tool on hard and soft joints. A hard joint typically gives a higher torque value than a soft joint. Generally speaking, the lower the meanshift of a tightening tool, the better it will be in achieving a specified torque value irrespective of the joint condition.

METAL TO METAL CONTACT FLANGE JOINT - A flanged joint in which a gasket is compressed by bolts - the gasket being located in a recess within the joint so that it is compressed by the bolt loads until metal to metal contact occurs. Unlike the FLOATING TYPE FLANGE JOINT, for metal to metal type joints there are no standardised gasket factor definitions, test procedures, nor generally acknowledged calculation procedures available.

MINOR DIAMETER - This is the diameter of an imaginary cylinder which just touches the roots of an external thread, or the crests of an internal thread.

MODEL ENGINEERS THREAD (M.E.) - A thread based upon the Whitworth thread form that was established in 1912. A very fine thread (a 3/32 inch thread having 60 tpi for example).

Can't find what you need?
Try Google....