National Bushing & Manufacturing Corp.
 
  Drill Bushing  Specifications
   
      
I.D. Range  Standard I.D. Tolerance All press fit bushings have lapped, honed or ground I.D.'s.  Bushings with I.D.'s up
(Drill Size)    (add to nominal I.D.) to 1.0" are concentric to .0003" max. T.I.R to the O.D.  Larger sizes are concentric
#80 to 1/4           +.0001 to +.0004  to .0005" T.I.R. to the O.D.
Over 1/4 to 3/4           +.0001 to +.0005
Over 3/4 to 1-1/2           +.0002 to +.0006 Unground bushings with .010 / .020" grinding stock on the O.D. are
Over 1-1/2 to 2-3/4           +.0003 to +.0007 concentric within .006"  The letter "U" is added to the part number ie, "LU."
Reamer Bushings   Standard and Special bushings will be manufactured using E52100
I.D. Range  Standard I.D. Tolerance material heat treated to a minimum of Rc 62-64 unless otherwise
(Std. Reamer Size)    (add to nominal I.D.) instructed by the customer.
#80 to 1/4          +.0005 to +.0008  
Over 1/4 to 1"          +.0006 to +.0010 No-counterbore bushings will be supplied unless otherwise specified.
Over 1"          +.0008 to +.0012  
         
           Ordering Information
Pcs. P
48            12
.5000
Quantity Type Outside               Length  Inside
Diameter Diameter
P = Headless Press Fit O.D. in           Lengths in I.D. in four place
H = Head Press Fit 64ths of 1"           16ths of 1" decimals weather
SF = Slip/Fixed Renewable (48 = 3/4")                    (12 = 3/4") inch or metric.
F = Fixed Renewable
L = Liner Bushing
HL =  Head Liner Bushing
U = Unground
C = Carbide
Bushings are typically ordered by using the part number structure shown above.  If you are not sure of the bushing
dimensions that will fill your needs start with the inside diameter and review the O.D. and lengths available in the
catalog pages 6 through 20.  Please feel free to call if there is any way we can help you find the right bushing.
Carbide Bushings add "C" in front of the Type code, ie, CH-64-12-.5000
Titanium Nitride Bushings (TIN) add "T" in front of the Type code, ie, TH-64-12-.5000
Unground Bushings add "U" after the Type code, ie, HU-64-12-.5000
Metric Bushings add "M" after the Type code and then the metric sizes for O.D. and Length followed by the  I.D.
size in metric  decimals.  Example: HM-42-25-30.00 is 42mm O.D., 25mm Long and 30mm ID.
 
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