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Head Press-Fit Bushings – Metric (HM) Model

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Head Press-Fit Bushings – Metric (HM)

Drill Bushings

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Metric version of our popular H bushing. HM bushings are permanently pressed into the jig plate. They are generally used for single-operation drilling or reaming, when you do not expect to replace bushings during the tooling's lifetime. The head can be left exposed, or recessed by counterboring the installation hole. Note: the "length" listed for an HM bushing refers to its overall length, not its length under the head.

Complete part numbers for all standard Metric Head Press-Fit Bushings (all standard ID, OD, and length combinations) are listed in the tables below. The Part Configurator link at the top of this page can be used for any HM bushing, either standard or special.

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Application Information

HM bushings are permanently pressed into the jig plate. The head can be left exposed, or recessed by counterboring the installation hole.

ID Tolerance

Standard ID Tolerance (G6):

From .35 to 3mm +.002/+.008mm

Over 3 to 6mm +.004/+.012mm

Over 6 to 10mm +.005/+.014mm

Over 10 to 18mm +.006/+.017mm

Over 18 to 30mm +.007/+.020mm

Over 30 to 50mm +.009/+.025mm

Over 50 to 80mm +.010/+.029mm

Over 80mm and up +.012/+.034mm

Reamer ID Tolerance (F6) (Special):

From 1 to 3mm +.006/+.012mm

Over 3 to 6mm +.010/+.018mm

Over 6 to 10mm +.013/+.022mm

Over 10 to 18mm +.016/+.027mm

Over 18 to 30mm +.020/+.033mm

Reamer bushings have a different ID-tolerance range than drill bushings. To special-order bushings with the reamer ID tolerance shown here, add "-REAMER" to the part number:

HM-8-12-4.50-REAMER (Special)

OD Tolerance

Standard OD Tolerance (s6):

4 to 6mm +.027/+.019

7 to 10mm +.032/+.023

12 to 18mm +.039/+.028

22 to 30mm +.048/+.035

35 to 48mm +.059/+.043

55 to 62mm +.072/+.053

70 to 78mm +.078/+.059

85 to 95mm +.093/+.071

Counterbore on Small ID Sizes

Metric bushings with small drill sizes through .80mm are counterbored 1.00mm diameter with 3mm drill-bearing length, according to ANSI standards, to eliminate binding and heat buildup.

Material

MATERIAL	HEAT TREAT	FINISH	DFARS	RoHS
1144 Stressproof Steel	heat treated to achieve Rc 62-64 ID hardness	-	✔	✔

Click here for detailed material and finish specifications.

California residents click here for Prop 65 information.

Other materials are available by special order

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CARR LANE MANUFACTURING
4200 CARR LANE CT.
P.O. BOX 191970
ST. LOUIS, MO 63119
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