BEYOND ENH6-3 TP11 118-150 Industrial Indexable Boring Bar and Milling Tool Holder (6mm / 0.24 Inches Shank Diameter, 150mm Overall Length) - TPMT110304 Inserts Excluded
BEYOND ENH6-2 TP11 94-126 Industrial Indexable Boring Bar Tool Holder (6mm Shank Diameter, 126mm Overall Length) - TPMT110304 Inserts Excluded
BEYOND ENH6-1 TP11 68-100 Industrial Indexable Boring Bar Tool Holder (6mm Shank Diameter, 100mm Overall Length) - TPMT110304 Inserts Excluded
BEYOND ENH6-3 TC11 118-150 Industrial Indexable Boring Bar Tool Holder (6mm Shank Diameter, 150mm Overall Length) - TCMT110204 Inserts Excluded
BEYOND ENH6-2 TC11 94-126 Industrial Indexable Boring Bar Tool Holder (6mm Shank Diameter, 126mm Overall Length) - TCMT110204 Inserts Excluded
BEYOND ENH6-1 TC11 68-100 Industrial Indexable Boring Bar Tool Holder (6mm Shank Diameter, 100mm Overall Length) - TCMT110204 Inserts Excluded
BEYOND ENH5-3 TP11 Industrial Indexable Boring Bar Tool Holder (5mm Shank Diameter) - TPMT110304 Inserts Excluded
BEYOND ENH5-2 TP11 Industrial Indexable Boring Bar Tool Holder (5mm Shank Diameter) - TPMT110304 Inserts Excluded
BEYOND ENH5-1 TP11 Industrial Indexable Boring Bar Tool Holder (5mm Shank Diameter) - TPMT110304 Inserts Excluded
BEYOND ENH5-3 TC11 78-95 Industrial Indexable Boring Bar Tool Holder - Compatible with TCMT110204 Carbide Inserts (Inserts Not Included)
BEYOND ENH5-2 TC11 68-85 Industrial Indexable Boring Bar Tool Holder (68mm - 85mm Range) - TCMT110204 Inserts Excluded
BEYOND ENH5-1 TC11 53-70 Industrial Indexable Boring Bar Tool Holder (53mm - 70mm Range) - TCMT110204 Inserts Excluded
BEYOND ENH4-3 TP11 61-74 Industrial Indexable Boring Bar Tool Holder (61mm - 74mm Range) - TPMT110304 Inserts Excluded
BEYOND ENH4-2 TP11 53-66 Industrial Indexable Boring Bar Tool Holder (53mm - 66mm Range) - TPMT110304 Inserts Excluded
BEYOND ENH4-1 TP11 41-54 Industrial Indexable Boring Bar Tool Holder (41mm - 54mm Range) - TPMT110304 Inserts Excluded
BEYOND ENH4-3 TC11 61-74 Industrial Indexable Boring Bar Tool Holder (61mm - 74mm Range) - TCMT110204 Inserts Excluded
BEYOND ENH4-2 TC11 53-66 Industrial Indexable Boring Bar Tool Holder (53mm - 66mm Range) - TCMT110204 Inserts Excluded
BEYOND ENH4-1 TC11 41-54 Industrial Indexable Boring Bar Tool Holder (41mm - 54mm Range) - TCMT110204 Inserts Excluded
BEYOND ENH3-3 TP08 50-60 Industrial Indexable Boring Bar Tool Holder (50mm - 60mm Range) - TPMT080204 Inserts Excluded
BEYOND ENH3-2 TP08 41-51 Industrial Indexable Boring Bar Tool Holder (41mm - 51mm Range) - TPMT080204 Inserts Excluded
BEYOND ENH3-1 TP08 32-42 Industrial Indexable Boring Bar Tool Holder (32mm - 42mm Range) - TPMT080204 Inserts Excluded
BEYOND ENH2-3 TP08 39-47 Industrial Indexable Boring Bar Tool Holder (39mm - 47mm Range) - TPMT080204 Inserts Excluded
BEYOND ENH2-2 TP08 32-40 Industrial Indexable Boring Bar Tool Holder (32mm - 40mm Range) - TPMT080204 Inserts Excluded
BEYOND ENH2-1 TP08 25-33 Industrial Indexable Boring Bar Tool Holder (25mm - 33mm Range) - TPMT080204 Inserts Excluded
Quick Links — Jump to Related Tooling
Boring bars, face mill, drill, holder guide, inserts:
Indexable Boring Bars | Rough & Fine Boring Series | BEYOND
BEYOND boring tools for 2-stage precision boring: rough boring with TPMT 11° positive inserts + fine boring with TCMT/CCMT. Micro 4mm to 32mm shank range.
The BEYOND rough and fine boring series covers the full 2-stage precision boring workflow: rough boring removes the bulk material using strong TPMT 11° positive inserts at high material removal rate, and fine boring achieves final size and surface finish using TCMT 7° positive or CCMT 80° rhombic inserts at low radial depth of cut. Each boring bar uses a cylindrical shank (ENH micro 4-6mm, SB face-mill 16-32mm, GTB 25-32mm) that fits standard CNC milling chucks or boring head holders, and accepts replaceable carbide inserts following the ISO 1832 geometry standard.
This collection is part of the broader BEYOND tool holder family and works with any ISO 1832 standard insert. For dedicated boring bars with larger diameter range, see the Screw-Clamp Boring Bar and Double-Clamp Boring Bar series.
6 Series Family Overview
| Series | Shank | Count | Insert | Best For |
|---|---|---|---|---|
| SB (SB C16/C25/C32) | C16 / C25 / C32 cylindrical | 49 | CCMT 060204 / 09T304 | Face-milling + boring combo, larger dia |
| ENH (ENH4/5/6) | ENH4 (4mm) / ENH5 (5mm) / ENH6 (6mm) | 26 | TPMT 110304 / TCMT 110204 | Micro-boring, small precision holes |
| GTB (GTB C25/C32) | C25 / C32 cylindrical | 16 | CCMT 060204 / 09T304 | Medium-large boring, indexable holder |
| ST (ST series) | Various cylindrical | 8 | TCMT / CCGT | Specialty boring configurations |
| MTR | Specialty | 1 | — | Specialty boring |
| Rough (placeholder) | — | 1 | — | — |
Rough Boring vs Fine Boring
Boring is typically done in 2 stages: rough boring for material removal, then fine boring for precision and surface finish. Each stage uses different inserts and parameters.
| Operation | Material Removal | Insert | Surface Finish | Tolerance | Feed |
|---|---|---|---|---|---|
| Rough Boring | 0.5-2.0 mm radial DOC | TPMT 110304 (TP insert, 11° positive) | Ra 3.2-6.3 μm | ±0.05 mm | 0.05-0.15 mm/rev |
| Fine Boring | 0.05-0.2 mm radial DOC | TCMT 110204 (TC insert, 7° positive) or CCMT 060204/09T304 (80° diamond) | Ra 0.4-1.6 μm | ±0.005 mm | 0.02-0.08 mm/rev |
The TPMT 11° positive insert has a stronger cutting edge for high-feed rough boring. The TCMT 7° positive insert has a sharper edge and can use wiper geometry for fine surface finish. CCMT 80° diamond inserts are general-purpose and work for both rough and fine boring.
Shank & Boring Diameter Reference
| Shank Series | Shank Ø | Min Bore | Max Bore | Insert | Application |
|---|---|---|---|---|---|
| ENH4 | 4 mm | 41 mm | 74 mm | TPMT / TCMT 11 | Micro-boring, mold work |
| ENH5 | 5 mm | 53 mm | 95 mm | TPMT / TCMT 11 | Small precision parts |
| ENH6 | 6 mm | 68 mm | 150 mm | TPMT / TCMT 11 | Small-medium precision boring |
| SB C16 | 16 mm | 10.7 mm | 14.7 mm | CCMT 060204 | Small bore, face mill combo |
| SB C25 | 25 mm | 25 mm | 39.7 mm | CCMT 09T304 | Medium bore |
| SB C32 | 32 mm | 41.7 mm | 49.7 mm+ | CCMT 09T304 | Large bore |
| GTB C25 | 25 mm | 15.7 mm | 25.7 mm | CCMT 060204 | Indexable medium boring |
| GTB C32 | 32 mm | 25.7 mm | 34.7 mm | CCMT 09T304 | Indexable large boring |
Insert Compatibility by Operation
| Insert Code | Geometry | Operation | Series Used | Best Material |
|---|---|---|---|---|
| TPMT 110304 | 11° positive triangle (TP INSERT) | Rough boring | ENH4 / ENH5 / ENH6 | Steel P-grade, cast iron |
| TCMT 110204 | 7° positive triangle (TC INSERT) | Fine boring | ENH4 / ENH5 / ENH6 / ST | Steel finishing, wiper edge possible |
| CCMT 060204 | 7° positive 80° diamond | Rough + fine | SB C16 / GTB C25 | General purpose, smaller diameter |
| CCMT 09T304 | 7° positive 80° diamond | Rough + fine | SB C25 / C32 / GTB C32 | General purpose, larger diameter |
For grade cross-reference between Sandvik / Mitsubishi / KORLOY / etc., see the Grade Cross-Reference Hub.
Application Guide — Common Boring Scenarios
| Application | Recommended Series | Shank | Rough Insert | Fine Insert |
|---|---|---|---|---|
| Hydraulic manifold port | SB C25 / C32 | 25 / 32 mm | CCMT 09T304 | CCMT 09T304 (same insert) |
| Cylinder bore (medium) | GTB C32 | 32 mm | CCMT 09T304 | CCMT 09T304 (wiper) |
| Small precision bore | ENH6 | 6 mm | TPMT 110304 | TCMT 110204 |
| Micro mold cavity | ENH4 / ENH5 | 4 / 5 mm | TPMT 110304 | TCMT 110204 |
| Bearing seat (precision) | SB C16 + fine boring head | 16 mm | CCMT 060204 | CCMT 060204 (wiper) |
| Large through bore | SB C32 + GTB C32 | 32 mm | CCMT 09T304 | CCMT 09T304 |
Cutting Parameter Guide
| Material | Cutting Speed (Vc) | Feed per Rev (fn) | Rough Radial DOC | Fine Radial DOC |
|---|---|---|---|---|
| Mild Steel (P) | 120-200 m/min | 0.05-0.15 mm/rev | 1.0-2.0 mm | 0.05-0.15 mm |
| Stainless Steel (M) | 80-140 m/min | 0.04-0.10 mm/rev | 0.5-1.5 mm | 0.05-0.10 mm |
| Cast Iron (K) | 100-160 m/min | 0.05-0.15 mm/rev | 1.0-2.0 mm | 0.05-0.20 mm |
| Aluminum (N) | 200-500 m/min | 0.05-0.20 mm/rev | 1.0-3.0 mm | 0.05-0.20 mm |
| Hardened Steel (HRC 50+) | 50-90 m/min | 0.03-0.06 mm/rev | 0.3-0.8 mm | 0.02-0.05 mm |
For boring cycle programming (G85/G86/G76 cycles) and chip-breaking formulas, see the Speeds & Feeds Hub.
Why Choose BEYOND Rough & Fine Boring Series
- 101 SKUs covering full boring workflow — single source for both rough boring (TPMT 11° positive) and fine boring (TCMT 7° positive wiper + CCMT 80° diamond), from micro 4mm shank to 32mm production holders.
- 6 series, 3 shank types — ENH micro-boring (4-6mm) for small precision, SB face-milling combo (C16-C32) for medium-large, GTB indexable holder (C25-C32) for production. One catalog covers every boring scenario.
- ISO 1832 standard inserts — TPMT, TCMT, CCMT inserts all accepted. Choose grade based on your material and operation (rough or fine).
- Cost-effective vs solid carbide boring — indexable boring bars cost 30-50% less than solid carbide boring bars, and the insert can be rotated/replaced when worn, extending tool life.
- Factory direct pricing — same geometry as premium brands (Sandvik, Mitsubishi, etc.) at 30-50% off OEM retail. Bulk tier discount: 2-9 pieces 6% off, 10+ pieces 12% off.
Frequently Asked Questions
1. What's the difference between rough boring and fine boring?
Rough boring removes the bulk of the material in a pre-existing hole, using a strong insert (TPMT 11° positive) at high material removal rate (0.5-2mm radial depth of cut). Fine boring follows to achieve the final size and surface finish, using a sharper insert (TCMT 7° positive wiper or CCMT 80° diamond) at low radial depth of cut (0.05-0.2mm). Most precision boring applications use both stages — rough for speed, fine for tolerance and finish.
2. Can I use the same boring bar for both rough and fine boring?
Yes — the boring bar body is the same; only the insert changes. For example, an ENH6-3 boring bar can run TPMT 110304 for rough boring (high feed) and TCMT 110204 for fine boring (wiper edge). This is one of the major cost advantages of indexable boring bars — buy one bar and stock both insert types for the 2-stage process.
3. What is the minimum bore diameter for ENH micro-boring?
ENH4 (4mm shank) boring bars can bore down to 41mm diameter bore range (the body diameter is larger than the boring diameter because the bar needs clearance for chip evacuation). For boring smaller holes (under 40mm), use a different bar type — solid carbide boring bars or boring heads. The ENH series is designed for boring in the 40-150mm range, which is the most common precision boring application.
4. Can I use SB face-milling arbors for boring?
Yes — despite being in the "boring" collection, the SB series is technically a face-milling cutter arbor with CCMT 09T304 inserts. It's used for both face milling and boring-style operations on larger diameters (25-50mm). For dedicated boring, the GTB series is a more rigid choice because it's designed for boring with a cylindrical shank, not a face mill arbor.
5. What is the difference between TPMT and TCMT inserts?
TPMT is 11° positive triangle (TP INSERT) with a thick insert body and strong cutting edge, designed for rough boring at high material removal rate. TCMT is 7° positive triangle (TC INSERT) with a thinner, sharper edge, designed for fine boring and finishing with possible wiper geometry. Both fit the same triangular insert pocket, so you can swap them in the same boring bar for rough-fine sequence.
6. Can I get custom boring diameter or shank length?
Yes. BEYOND offers custom boring bar manufacturing for non-standard lengths or special shank diameters, with a 5-piece MOQ and 2-3 week lead time. Common custom requests include 200mm+ length for deep boring, or special shank sizes (3mm, 8mm, 10mm). Contact sales at chao@cnchome-beyond.com or WhatsApp +86 15990663752 for a custom quote.
Internal Resources — Browse BEYOND Tooling Catalog
Explore related BEYOND tool holders, drills, and milling tools used alongside boring bars:
BEYOND Tool Holders
Boring & Threading
Drilling
Other Milling Tools
Insert Brands (8 Global)
Resource Pages
Need a custom boring diameter or longer reach?
200mm+ length boring, custom shank sizes, special diameters available on request. 5-piece MOQ, 2-3 week lead time.
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