Magnum 2 and 3 Inch Capacity R8 Boring Head (SBH2&3R8)

Execute high-precision internal profiling on your knee mill with this robust R8 boring head. The heat-treated steel body and precision-ground dovetail slides provide the lateral rigidity required to resist harmonic chatter, even during aggressive material removal on cast iron. With a universal 1-1/2"-18 threaded interface, this head allows you to switch between 2-inch and 3-inch setups, making it an indispensable tool for creating accurate bores, counterbores, and internal grooves.

Features

• Stability - High-carbon steel body dampens vibration for superior surface finishes.
• Alignment - Integrated R8 taper ensures continuous centerline alignment in the machine spindle.
• Interface - Standard 1-1/2"-18 TPI threading accepts a wide range of boring tool holders.

Specifications

• Product Type: Boring Head
• Capacity: 2" (50.8 mm) & 3" (76.2 mm)
• Mounting Thread: 1-1/2"-18 TPI
• Taper Standard: R8
• Drawbar Thread: 7/16"-20
• Dimensions: 3.0" x 3.0" x 5.5" (76.2 x 76.2 x 139.7 mm)
• Weight: 4.8 lbs (2.18 kg)
• Supplier Part Number: SBH2&3R8
• KMS Product Code: MAG-SBH2&3R8

Common Shop Applications

• Boring and counterboring in Bridgeport-style mills
• Internal grooving and profiling
• High-accuracy hole finishing

Recommended Shop Add-Ons

• Most Mill Operator also grab: Boring Bar Kit - it gives you the right tool for every bore depth.
• Most Machinist also grab: Dial Indicator - it is essential for centering your work before boring.

Frequently Asked Questions

Q: Is this compatible with a 7/16"-20 drawbar? A: Yes, the R8 shank features the standard industrial thread size for easy installation.

Q: Can the slides be locked? A: Yes, integrated gib locks allow you to freeze the tool block position once your diameter is set.