SERRATED PRESS-FIT BUSHINGS
METRIC |
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SPM
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FEATURES: Similar to a PM bushing, but with top serrations to prevent rotation in soft materials. SPM bushings are recommended in high-torque situations for materials such as magnesium, aluminum, masonite, or wood. Finish-ground OD ensures accurate ID location. Serrations also resist axial force to prevent pushing the bushing through the jig plate.
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. | | SPM-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 |
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:| | SPM-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). DFARS and RoHS compliant. |
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