R8 Face Mill Holder With 1-1/4 Inch Arbor 7/16-20UNF Drawbar Thread Shell Mill Arbor Supports 4 To 5 Inch End Mills For Bridgeport Machines, Precision Ground Contact Surface, Runout Under 0.0004 Inch For Tight Tolerances

R8 Face Mill Holder, single unit, 1-1/2 Arbor
✔️ Arbor: 1-1/2 in, Shank: R8, Drawbar 7/16-20UNF, Shell 4-5 in, Pack 1

This precision-ground face mill holder is designed to mount shell end mills on Bridgeport-style milling machines and other CNC setups. It delivers tight runout and solid clamping for 4-5 inch end mills, ensuring accurate milling performance.

✅ Arbor and shank combo: 1-1/2 in arbor, R8 shank, 7/16-20UNF drawbar
✅ Runout tolerance: bottom contact surface ground for durability and accuracy (0.0004 in)
✅ Material and heat treatment: drop-forged alloy, 56-58 HRc
✅ Finishing and clamping: milled assembly with double-sided clamping key to resist shake
✅ Range and fit: supports 4-5 in shell mills for Bridgeport-type machines

💡 What is a face mill holder with an R8 shank used for in milling setups?

It’s a handy way to mount large shell mills on standard machines.

- A precise, repeatable interface between spindle and end mill - Quick tool changes for 4-5 inch shells in busy shops - Improved rigidity and reduced runout for tight tolerances - Durable alloy construction with precision-ground mating surfaces