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PM
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FEATURES: Metric version of our popular P bushing. PM bushings are permanently pressed into the jig plate, usually flush with the top surface. They are generally used for single-operation drilling or reaming, when you do not expect to replace bushings during the tooling's lifetime. PM bushings can be mounted closer together than headed bushings, but offer less resistance to heavy axial loads.
STANDARD SIZES: See Dimensions page for part numbers and standard ID drill sizes. The prices shown apply to standard bushings only, with any standard metric ID size within the stated range. | | PM-8-12-4.50 | | Standard bushing,
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 bushings have a different tolerance range than drill bushings:| | 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 bushings with a reamer tolerance, add "-REAMER" to the part number:| | PM-8-12-4.50-REAMER (Special) |
COUNTERBORE ON SMALL DRILL 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: 1144 Stressproof steel, heat treated to achieve Rc 62-64 ID hardness. Other materials readily available by special order (see Specials).
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