Description
Serrated Press-Fit Bushings-Metric (SPM)
Bushings are similar to PM bushings, 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. Serrations also resist axial force to prevent pushing the bushing through the jig plate.
Application Information
SPM bushings have top serrations to prevent rotation in softer materials, such as magnesium, aluminum, masonite, or wood. Finish-ground OD ensures accurate ID location.
ID Tolerance
Standard ID Tolerance (G6):
From .35 to 3mm +0.002/+0.008mm
Over 3 to 6mm +0.004/+0.012mm
Over 6 to 10mm +0.005/+0.014mm
Over 10 to 18mm +0.006/+0.017mm
Over 18 to 30mm +0.007/+0.020mm
Reamer ID Tolerance (F6) (Special):
From 1 to 3mm +0.006/+0.012mm
Over 3 to 6mm +0.010/+0.018mm
Over 6 to 10mm +0.013/+0.022mm
Over 10 to 18mm +0.016/+0.027mm
Over 18 to 30mm +0.020/+0.033mm
OD Tolerance
Standard OD Tolerance (h5):
12 to 18mm 0/-0.006
Counterbore on Small Drill Sizes
Metric bushings with small drill sizes through 0.80mm 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 | – | Yes | Yes |
Parts Specification
| ID (mm) | OD (mm) | Length (mm) |
| 6.25mm | 12mm | 20mm |
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