734.453.2295

42330 E. Ann Arbor Rd
Plymouth, MI 48170

Tolerances and Design Specifications

Bushings

Introduction

Anti-friction rotary bushings are self contained bearing cartridges used to support and guide rotating cutting tools. They consist of a stationary outer case; a hardened and ground inner liner which rotates with the cutting tool; anti-friction bearings and seals. They are manufactured in several series with each having distinct advantages that cover the broadest range of metal working applications. While available in a wide range of standard sizes, Gatco Rotary Bushings are commonly and readily modified to suit individual requirements or specifications.

Specials

For those situations where a standard or modified standard bushing is not suitable, our engineering department can provide a special design to suit your specific requirements. Contact Gatco and send your requirements for an immediate design and quotation.

Standard GATCO Manufacturing Tolerances:

Tolerances - Inside Diameter

Standard manufacturing tolerances for inside diameter are as follows:

Description (inches)
I.D. under 1.625"
I.D. 1.625" and above
Runout
Finish

Tolerance (inches)
+.0003" to +.0006"
+.0005" to +.0010"
.0005" T.I.R. (Closer runout available on request)
12-20 µ inch

Description (metric)
I.D. under 41.27
I.D. 41.27 and above
Runout
Finish

Tolerance (metric)
+0.007 to +0.015
+0.013 to +0.025
0.013 T.I.R. (Closer runout available on request)
12-20 µ inch


Tolerances - Outside Diameter

Standard manufacturing tolerances for outside diameter are as follows:

Description (inches)
Standard O.D. grind
Std. O.D. grind for GB/GBM
Standard O.D. stock

Tolerance (inches)
+.0000" to -.0005"
-.0002" to -.0004"
+.020"

Note: All Bushings are provided standard with .020" grind stock except GB, GBM,
GNT and GNTM which are provided finished O.D. ground. O.D. grind available at additional charge.

Description (metric)
Standard O.D. grind
Std. O.D. grind for GB/GBM
Standard O.D. stock

Tolerance (inches)
+0.000 to -0.013
-0.005 to -0.010
+0.50

Note: All Bushings are provided standard with 0.50 grind stock except GB, GBM,
GNT and GNTM which are provided finished O.D. ground. O.D. grind available at additional charge.


Recommended Fitting Tolerance

Description (inches)
Minimum Fit Between Tool O.D. and Bushing I.D.
Under 1.625" = Tool
1.625" and above = Tool
Minimum Fit Between Housing Bore and Bushing O.D.
Housing Bore = Bushing

Tolerance (inches)
Minimum Fit Between Tool O.D. and Bushing I.D.
O.D. +.0003" to +.0006"
O.D. +.0005" to +.0010"
Minimum Fit Between Housing Bore and Bushing O.D.
O.D. +.0000" to +.0005"

Description (metric)
Minimum Fit Between Tool O.D. and Bushing I.D.
Under 41.27 = Tool
41.27 and above = Tool
Minimum Fit Between Housing Bore and Bushing O.D.
Housing Bore = Bushing

Tolerance (metric)
Minimum Fit Between Tool O.D. and Bushing I.D.
O.D. +0.007 to +0.015
O.D. +0.013 to +0.025
Minimum Fit Between Housing Bore and Bushing O.D.
O.D. +0.000 to +0.013