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Split-formed Pulleys - NHI Standard bore Information
New Hampshire Industries manufactures drive products to fit many common shaft sizes. The most popular nominal bore/shaft combinations, listed below, are available in standard hubs and in machined drive pulleys.
|
Nominal Bore/Shaft Diameter (ID) |
Keyway Width Range (Kw) |
Keyway Height Range (Kh) |
|
INCH |
|
|
|
Ø3/8" (.375") |
.0967/.0937" |
.441/.431" |
|
Ø1/2" (.500") |
.128/.125" |
.570/.560" |
|
Ø5/8" (.625") |
.1905/.1875" |
.729/.719 |
|
|
.1905/.1875" |
.724/.714" |
|
Ø3/4" (.750") |
.1905/.1875" |
.852/.842" |
|
Ø7/8" (.875") |
1905/.1875" |
.984/.974" |
|
|
1905/.1875" |
.979/.969" |
|
Ø1" (1.000") |
.254/.250" |
1.129/1.119" |
|
|
254/.250" |
1.125/1.115" |
|
Ø1-1/8" (1.125") |
254/.250" |
1.260/1.250" |
|
Ø1-1/4" (1.250") |
254/.250" |
1.375/1.365" |
|
METRIC |
|
|
|
Ø15mm (.591") |
5.11/5.03mm (.201/.198") |
17.35/17.09mm (.683/.673") |
|
Ø17mm (.669") |
4.84/4.76mm (.1905/.1875") |
19.74/19.48mm (.777/.767") |
|
|
5.11/5.03mm (.201/.198") |
19.74/19.48mm (.777/.767") |
|
Ø25mm (.984") |
6.45/6.35mm (.254/.250") |
28.07/27.56mm (1.105/1.095") |
|
Other sizes/ keyways can be manufactured - Call with requirements. |
Special Bores
In addition to round bores and bores with standard keyways NHI produces products with "D", "Double D", hex, double hex, and splined bores. Contact NHI Product Engineering (support@nhipulleys.com) to discuss your specialty bore requirements.
Extra cost options for standard NHI hubs and machined drive pulleys include:
· One or two set screw holes (at 90°) in hubs and drive pulleys (standard size chart below).
· Installation of specified set screws.
|
Standard Set Screw Holes (Inch) |
|
Nominal Diameter |
National Coarse |
National Fine |
|
1/4" (.250") |
20 |
28 |
|
5/16" (.312") |
18 |
24 |
|
3/8" (.375") |
16 |
Special Order |
|
Other sizes available by special order - Call with requirements |
|
Standard Set Screw Holes (Metric) |
|
Available by special order - Call with requirements |
NHI is also capable of supplying custom manufactured hubs and machined drives in production quantities. Contact NHI Product Engineering (support@nhipulleys.com) for the standard or custom hub or custom machine drive pulley to fit your application.
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