Dorian Tool 73310104082 Milling Machine Drawbar 7/16-20

Product Description

The DORIAN TOOL 73310104082 is a milling machine drawbar designed to secure toolholders inside the spindle of compatible vertical milling machines. The drawbar threads into the toolholder shank from above, clamping it firmly against the spindle taper during cutting operations. This unit measures 23.5 inches overall length, with a 5.5-inch hex section for wrench engagement and a 1.75-inch threaded section at 7/16-20 thread size. It weighs 1.55 pounds. Machinists and machine tool service technicians install this component during spindle toolholder changes or when replacing a worn or damaged drawbar.

This drawbar is compatible with Bridgeport 2J Variable Speed Head Mills. It is suited to job shop, toolroom, and light production environments where Bridgeport-style knee mills are the primary machining platform. The 7/16-20 thread specification and 23.5-inch overall length match the dimensional requirements of the 2J variable speed head spindle assembly. Install this part when the original drawbar shows thread damage, bending, or wear that causes toolholder slippage or runout.

Key Features

• 23.5-inch overall length fits the Bridgeport 2J Variable Speed Head spindle depth
• 7/16-20 thread size matches standard Bridgeport R8 toolholder drawbar specifications
• 5.5-inch hex section provides full wrench engagement for proper torque application
• 1.75-inch threaded bar length ensures secure toolholder clamping
• Direct OEM-style replacement at 1.55 pounds - close to original weight for balance

Compatibility

Compatible with Bridgeport 2J Variable Speed Head Mills as stated by the manufacturer.

Installation Notes

Installation is performed by a qualified machinist or machine tool service technician. Power down and lockout/tagout the milling machine before accessing the spindle or drawbar. Use a wrench on the hex section to thread the drawbar into the toolholder shank - do not over-tighten, as this can damage the spindle threads or toolholder. Verify toolholder seating and drawbar thread engagement before returning the machine to service.