HM
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FEATURES: Metric version of our popular H bush. HM bushes are permanently pressed into the jig plate. They are generally used for single-operation drilling or reaming, when you do not expect to replace bushes during the tooling's lifetime. The head can be left exposed, or recessed by counter-boring the installation hole. Note: the "length" listed for an HM bush refers to its overall length, not its length under the head.
STANDARD SIZES: See Dimensions page for part numbers and standard ID drill sizes. The prices shown apply to standard bushes only, with any standard metric ID size within the stated range. | | HM-8-12-4.50 | | Standard bush,
4.50mm ID |
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 80 to 120mm | | | | +.012/+.034mm |
REAMER ID TOLERANCE (F6): Reamer bushes have a different tolerance range than drill bushes:| | 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 |
To order bushes with a reamer tolerance, add "-REAMER" to the part number:| | HM-8-12-4.50-REAMER (Special) |
COUNTER-BORE ON SMALL DRILL SIZES: Metric bushes with small drill sizes through .80mm are counter-bored 1.00mm diameter with 3mm drill-bearing length, according to ANSI standards, to eliminate binding and heat buildup.
MATERIAL: 1144 Stress-proof steel, heat treated to achieve Rc 62-64 ID hardness. Other materials readily available by special order (see Specials). |
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