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FEATURES: Similar to an SFM metric renewable bushing, but with specially designed chip-breaking notches on the drill-exit end. Use to break up chips from tough, stringy materials, to reduce friction and heat buildup. Reduces bushing wear at the drill-exit end and reduces the chance of tool or workpiece damage. A chip-breaker bushing should extend beyond its liner to allow chips to escape. Chip breakers are also available on other bushing types such as PM and HM.
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. | | CHM-10-20-4.50 | | SFM-type bushing with chip
breaker, 4.50mm ID | | | PMCH-10-20-4.50 | | PM-type bushing with chip
breaker, 4.50mm ID | | | HMCH-10-20-4.50 | | HM-type bushing with chip
breaker, 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 |
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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