From A Millwrights Guide to Motor/Pump Alignment, Second Edition

K

Keyway:
On a shaft a keyway is a linear external machined slot which will contain usually half the depth and the full length of the key. Inside the coupling or other shaft-fitting fixture an internal keyway will contain the other half of the key. When the three are properly assembled, neither the shaft nor the fixture can rotate without the other turning round-for-round also.
The key to the left is only partly inserted into the shaft keyway. The key on the right is fully inserted. This shows an overhead and a profile view on the same shaft, although two keys on the same shaft will usually be in axial alignment with each the other.
Knob fitting:
In alignment this would usually pertain to dial indicator jigs and other such paraphernalia normally part of an indicator set. Knob fittings, sometimes called knurled fittings, are the norm rather than the exception.
Knurled fittings:
See knob fitting.
Copyright Tommy B. Harlon 2008 under license agreement with Books24x7

Products & Services
Knobs (industrial)
Industrial knobs are small, usually round, devices that are designed for use on industrial machinery, electronic components, and metal cabinetry. They are usually made out of metal, plastic, or rubber and are available in a variety of sizes, colors, and finishes.
Control Knobs
Control knobs are used for the control or adjustment of electronic or electrical devices.
Industrial Pins
Industrial pins are varieties of fastening hardware meant to couple, align, mount, assemble, or penetrate two workpieces. The operation of the pin depends on design and employment, but industrial pins can be categorized into several categories, such as: hitch and linch pins; cotter pins and wire clips; spring pins; locating and fixturing pins; and specialty pins.
Machine Keys and Keystock
Machine keys and keystock are demountable machine elements that are used to transmit torque from a shaft to a mounted component, such as a gear or pulley. They are usually made of steel or stainless steel and plated with zinc for wear and oxidation resistance.
Shaft Collars
Shaft collars attach to shafts and are used as stop features or targets for devices such as tachometers.

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