Magnum 1/2 Inch Shank R8 End Mill Holder (R8EMH12)

Achieve maximum rigidity during heavy plunging and aggressive slotting with this 1/2-inch R8 end mill holder. Unlike standard collets, this holder uses a positive-locking set screw that engages the Weldon flat of the tool shank, entirely eliminating tool pullout under extreme axial loads. The solid steel construction dampens vibrations, allowing for faster feed rates and improved surface finishes in tough materials.

Features

• Positive Lock - Integrated set screw provides a mechanical lock against tool shanks with flats.
• Rigidity - One-piece solid steel design is significantly stiffer than a collet assembly.
• Precision - Ground R8 taper ensures consistent seating and minimal runout in the spindle.

Specifications

• Product Type: End Mill Holder
• Shank Capacity: 1/2" (12.7 mm)
• Taper: R8
• Locking Mechanism: Side Set Screw
• Drawbar Thread: 7/16"-20
• Dimensions: 1.5" x 1.5" x 5.0" (38.1 x 38.1 x 127 mm)
• Weight: 1.5 lbs (0.68 kg)
• Supplier Part Number: R8EMH12
• KMS Product Code: MAG-R8EMH12

Common Shop Applications

• Aggressive material removal and slotting
• Plunge milling and heavy axial loading
• Continuous production milling in steel and alloys

Recommended Shop Add-Ons

• Most Mill Operator also grab: 1/2" End Mill - it is the perfect match for this holder.
• Most Pro Machinist also grab: Anti-Seize Lubricant - it prevents the set screw from galling over time.

Frequently Asked Questions

Q: Can I use an end mill without a Weldon flat? A: It is not recommended for heavy cutting, as the set screw needs the flat to prevent the tool from spinning or pulling out.

Q: Does it come with the set screw? A: Yes, the holder includes the necessary hardened set screw for immediate use.