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785-392-3017 • Fax: 785-392-2845

PO Box 232 • Minneapolis, KS 67467

Complexity of Specifications The Implications of Steelmaking, Standards, and Brands on Material Specification In short, the world of keystock is confusing and nonstandardized. For the user, it is important to note: • Producing keystock is more difficult than it looks.

The addition of other features and attributes such as heat treatment can further complicate production of shaft keys. Heat treatment can relieve material stresses, and parts can swell and shrink. In close tolerance keystock applications, the addition of heat treatment can result in additional processing costs for stress relieving, grinding, or milling.

• Imperial (inch) product tends to be close tolerance oversized if called ”keystock” and wider tolerance undersized if called ”barstock.”

The engineer and designer should carefully work with G.L. Huyett engineers to find the right balance of specification and costs, so that the part yields desirable mechanical benefits at the desired cost.

• Metric (mm) parts are nearly always close tolerance undersized.

Contact our engineering team at for immediate assistance.

• The tighter the tolerance the more the product costs to manufacture.

ance. can impact perform The ends of the key end design an to er ref ds en Round or radiused oa lled or broached int where the end is mi end or both e on ve ha y ma ys full radius. Ke which is a DIN 6885 standard, ends round. In the lel and ral pa al standard for leading internation forms. The as t ou led cal are ds tapered keys, the en refers to a ” ”B d an d a round en letter ”A” refers to referred to is th one end round square end. A key wi nded is rou ds en th bo th key wi as Form AB, while a B. rm Fo ds square is Form A, and both en


of milled into the side Because keyways are try and exit en the , ter cut ng shafts using a rotati a radius into the shaft form points of the cutter the of rn tte match the pa or slot. Form A keys nd end rou t tha son rea s thi keyway and it is for round me believe that the keys are specified. So yway. Round ke the o int ion lat design eases instal than the common in Europe end keys are more United States. s End mill enter of surface area a Shaft creating radiused end.

Form A

Form B wn the eeds axially do s End mill proc it, end mill form ex on Up e. ac y shaft surf d. A round ke en d se diu ra another ay slot; cupies the keyw completely oc d key would de en re ua sq whereas a either end. have voids at

Form AB

Revision 11-13



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