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Shaft/Keyway Requirements

Float-A-Shaft®'s Shaft and Keyway Requirements

Shaft Diameter
Tolerance of plus 0.000 in. to minus 0.002 in. is recommended and should have runout within 0.002 in TIR.

Shaft Material
Use only alloy steel or stainless-steel for shafting, having a minimum hardness of RC40, or transmission shafting grade like 4140 or equivalent.

Shaft Finish
In stationary applications the shaft finish should be 64 RMS or better. Shaft finish for traversing applications should be 32 RMS.
Shaft Straightness
Shaft should be straight within 0.0015 in.TIR. per foot.
Keyway
Keyway should be made up to 0.001 oversize than the nominal. See dimension table for nominal keyway sizes. Sharp edges of keyway should be avoided.
Shaft Support
The shafts should be supported rigidly with either bearing blocks or pillow blocks to avoid excessive deflection.

Lubrication
An  extreme-pressure synthetic lubricant which exhibits excellent anti-wear and rust protection qualities such as Mobilith® SHC 460 [14 oz. cartridge #0100-1605] or equivalent is recommended.

Temperature range...............................0 - 300oF
NGLI Number................................................1.5 - 2
Dropping Point (ASTM D566).........................490+
Penetration Worked (ASTM D217)....................300