BEYOND R390-C20-21-200-2T Indexable Square Shoulder Milling Cutter Shank (21mm / 0.83" Cutting Dia, 200mm Reach) 125mm-length dry machining is recommended to

dry machining is recommended to avoid thermal micro-cracking

15 mm/rev Cast Iron / Nodular Iron (K-Class) 100 - 200 m/min 0

"Switched to TT7220 for our steel jobs

Q: How do you prevent chatter and vibration when using an extended 250mm length cutter body

It clears out chips smoothly with no deep chatter marks on low-alloy steel

BEYOND R390-C20-21-200-2T Indexable Square Shoulder Milling Cutter Shank (21mm / 0.83" Cutting Dia, 200mm Reach) 125mm-length dry machining is recommended toBEYOND R390 C20 21 200 2T Indexable Milling Cutter Shank ISO ANSI Standard 21mm Square Shoulder Milling Tool Holder Long Reach C20 C21 Straight Shank (200mm OAL) for R390 11T3 Inserts IMPORTANT NOTICE DISCLAIMER: Insert Disambiguation Indexable Milling Cutter Shank Body Only. Carbide inserts shown in product images are for demonstration and mounting reference only. Inserts are NOT included with the tool holder and must be purchased separately.