Product Description
The Martin Sprocket & Gear 2012 30MM is a Taper-Lock bushing in the 2012 series, featuring a 30 mm finished metric bore with an 8 x 3.3 mm keyway. It is a non-flanged, split-taper bushing designed for flush mounting on sprockets, sheaves, pulleys, and couplings, providing superior clamping force on the shaft. Manufactured from steel and conforming to ANSI B15.1, it is industry-standard and interchangeable with 2012-series taper bushings from other major manufacturers. Suitable for horizontal shaft orientation.
Technical Specifications
| Specification | Value |
|---|---|
| Brand | Martin Sprocket & Gear |
| Model / Part Number | 2012 30MM |
| Product Type | Taper Lock Bushing |
| Bushing Series / Size | 2012 |
| Bore Diameter | 30 mm |
| Bore Type | Finished with Keyway (Metric) |
| Outside Diameter (Barrel, Large End) | 2-3/4 in (69.85 mm) |
| Overall Length (Length Through Bore) | 1-1/4 in (31.75 mm) |
| Hub Diameter | 3-7/8 in (Steel) |
| Maximum Hub Outside Diameter | 3-7/8 in (Steel), 4-3/4 in (Class 20 Gray Iron), 4-3/8 in (Class 30 Gray Iron) |
| Maximum Bore Diameter | 2-1/8 in / 50 mm |
| Bolt Circle Diameter | 2-5/8 in |
| Number of Bolt Holes | 2 |
| Screw Thread Size | 7/16-14 in |
| Screw Length | 7/8 in |
| Screw / Wrench Torque | 280 in-lb |
| Torque Rating | 7,150 in-lb |
| Keyway Size | 8 x 3.3 mm |
| Taper Angle | 8 degrees |
| Material | Steel (Sintered Powder Steel) |
| Flange Type | Non-Flanged (Flush Mount) |
| Shaft Orientation | Horizontal |
| Standard / Approval | ANSI B15.1 |
| Weight | 1.43 lbs |
| Suitable For Use With | Sprockets, Sheaves, Pulleys, Couplings (2012-series hubs) |
We warranty all items for 30 days from date of purchase.
Other Details
We warranty all items for 30 days from date of purchase. If you experience any issues with your item within this period, please contact us and we will work with you to resolve the problem. This warranty covers defects in functionality but does not cover damage caused by misuse, improper installation, or normal wear and tear.Product Videos
Custom Field
GTIN 679523686161
Hole Diameter 3-7/8 in (Steel)
Thread 7/16-14 in
Material Steel (Sintered Powder Steel)
Torque 280 in-lb
Diameter 3-7/8 in (Steel)
Manufacturer Martin
Empty Weight 1.43 lbs
Part Number 2012 30MM
Overall Length 1-1/4 in (31.75 mm)
Series 2012
Shelf A-3
Bore Diameter 30 mm
Model 2012 30MM
MPN 2012 30MM
Type Taper Lock Bushing
