Collection: Boring Bars
Boring Bars for CNC machine shops. Browse our full boring bars range. India-wide shipping. Bulk pricing available — message us on WhatsApp for quotes.
Internal boring bars for CNC and conventional lathes — carbide-shank anti-vibration bars, indexable carbide-insert bars (SCLCR, SDUCR, SDNCN), and internal threading bars. Sizes from 6 mm to 40 mm shank.
Frequently asked questions
Should I buy a steel-shank or carbide-shank boring bar?
Steel-shank bars are fine up to 4× length-to-diameter ratio (L/D). Beyond 4× L/D, carbide-shank bars are 3× stiffer and reduce chatter dramatically. Carbide bars cost 2-3× more but are essential for deep bores where a steel bar will chatter and leave a chewed-up surface.
What is the minimum bore size for a boring bar?
Minimum bore = nominal bar diameter + 1-2 mm clearance. A 10 mm boring bar can reach into a ~12 mm minimum bore (the tip geometry lets the insert project past the bar body). For tiny bores (<6 mm), you need a micro-boring bar with a very small insert like CCGT030102 or proprietary round-insert designs.
Why does my boring bar chatter?
Top three causes in order: (1) L/D ratio too high for a steel-shank bar — swap to carbide. (2) Insert nose radius too large for the bore diameter. (3) Machine clamping not rigid — insufficient clamping length in the tool post (need 4× bar diameter clamped).
Can I use the same insert in a boring bar and an external turning holder?
Usually yes if the ISO code matches. A CCMT060204 insert mounts in either an SCLCR external holder or an SCLCR boring bar at the correct size. Chipbreaker choice changes though — boring wants a lighter chipbreaker (e.g. -SM) because chip evacuation is harder internally.
Do you stock internal threading bars?
Yes — internal threading bars with 16 ER / 16 EL / 22 ER indexable heads for ISO and UN threads are stocked. Send a thread spec (e.g. M30 × 1.5 internal, minimum bore 25 mm) on WhatsApp and we quote the right bar and insert combination.
