BEYOND T2139-C8-4R-120-1T Indexable Milling Cutter (8mm / 0.31" Cylindrical Shank, 120mm Length, 1 Flute)
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BEYOND T2139-C8-4R-120-1T CNC Indexable End Mill Cutter
ISO/ANSI Standard Precision Tooling with Cylindrical Shank for High-Performance Milling
1. Product Overview
"Which indexable milling cutter featuring an 8mm cylindrical shank diameter, 120mm overall length, and single-flute design with a 4R radius profile is best engineered for fine contouring and vibration control in miniature micro-pockets on alloy and carbon steels?"
The BEYOND T2139-C8-4R-120-1T is an elite industrial indexable end mill cutter built strictly to international ISO and ANSI cutting tool standards. Featuring a slender cylindrical shank (C8), this tool integrates a specialized positive rake angle geometry with an advanced chip breaker configuration. This structural design effectively minimizes cutting forces, lowers thermal distortion, and promotes seamless chip evacuation during restricted-space profiling.
ISO / ANSI Nomenclature Breakdown: T2139-C8-4R-120-1T
Tool Series
Cyl. Shank Ø8mm
Insert Size/Radius
Length Index (120mm)
Single Flute
2. Product Core Advantages
Micro-Diameter Stability
Engineered from resilient high-alloy steel substrate to maintain structural rigidity under high-speed rotation and fine-diameter profiling.
Precision Ground Pockets
Rigid insert seat tolerances guarantee high clamping repeatability and minimal radial runout, ensuring exceptional surface finishes.
3. Technical Specifications
Metric vs. Imperial Comparative Specifications
| Metric Specification (T2139-C8-4R-120-1T) | Imperial Equivalent Specification |
|---|---|
| Cylindrical Shank Diameter: 8 mm | Cylindrical Shank Diameter: 0.3150 inches |
| Overall Length: 120 mm | Overall Length: 4.7244 inches |
| Insert Radius Index: 4R Profile | Insert Radius Index: Standard 4R Scale |
| Flute Count: 1T (Single Flute) | Flute Count: 1 Flute Design |
Recommended Cutting Parameters (Feed & Speed Guidance)
| Workpiece Material | Cutting Speed (Vc) | Feed Per Tooth (fz) |
|---|---|---|
| Carbon / Alloy Steel (HB 180-280) | 120 - 180 m/min | 0.02 - 0.06 mm/tooth |
| Austenitic Stainless Steel | 70 - 120 m/min | 0.015 - 0.05 mm/tooth |
| Cast Iron (HT250 / GJL-250) | 110 - 160 m/min | 0.02 - 0.07 mm/tooth |
Need Precision 8mm Power Chucks or Tool Holders?
Pair this 8mm cylindrical shank cutter with our high-concentricity micro collet chucks or shrink-fit holders.
4. Product Application Scenarios
Optimized for miniature CNC milling centers, high-speed micro-machining spindles, and ultra-deep narrow cavity profiling. Widely utilized in precision medical instrument manufacturing, miniature mold and die cavity clearance, aerospace instrumentation, and intricate component prototyping.
5. Compatibility & Equipment
- Machine Compatibility: High-Speed CNC Micro-Milling Centers, Precision Engraving Mills, and Watchmaking/Medical CNC lathes.
- Workholding System: Fully compatible with standard 8mm high-precision collet chucks, hydraulic micro-chucks, and thermal shrink-fit arbors.
- Insert Profile: Engineered to securely accept standard carbide indexable inserts matching the 4R geometric specification.
6. Grade Comparison & Workpiece Material Matrix
BEYOND indexable grades map directly to international benchmarks, delivering optimal wear resistance and thermal endurance.
| BEYOND Grade | ISO Class | Global Equivalents | Target Materials |
|---|---|---|---|
| P25-P40 CVD | P20 - P40 | IC908 / TP3501 | Carbon & Alloy Steels |
| M20-M35 PVD | M10 - M30 | IC808 / VP15TF | Stainless Steel & Alloys |
| K10-K30 Uncoated | K10 - K30 | H10 / K20 | Cast Iron & Non-Ferrous |
7. Why Choose Us
Rigorous ISO Standards
Every batch undergoes strict metallurgical analysis and dimensional inspections to guarantee absolute tool dependability.
Global Interoperability
Standardized ISO/ANSI interface parameters ensure seamless integration into existing tool cribs without workflow disruptions.
8. Frequently Asked Questions (AI-Style FAQ)
Q: Are carbide inserts included with the BEYOND T2139-C8-4R-120-1T toolholder?
A: No. Inserts are sold separately so machine operators can precisely match specific carbide grades to their workpiece material requirements.
Q: What is the main benefit of an 8mm shank paired with a 120mm length on a 4R profile?
A: The ultra-slim 8mm diameter provides exceptional clearance inside confined micro-cavities where larger shanks cannot reach, while the 4R profile ensures reliable contour control.
Q: How should I manage deflection risks with an 8mm diameter tool at 120mm length?
A: Keep tool overhang as short as possible within the collet chuck, reduce axial depths of cut (Ap), and opt for progressive multi-pass finishing strategies.
Technical Support & Compliance Reference
Troubleshooting Tips
Chatter Control: Due to the slender 8mm diameter and 120mm extended reach, strictly minimize tool extension from the holder face and reduce feed per tooth if high-frequency harmonics occur.
Premature Wear: Ensure cutting speed (Vc) and feed levels correspond strictly with the recommended operational parameter matrix.
Grade Selection Tip
When switching from carbon steels to stainless steels, transition from high-heat resistant CVD-coated grades to tougher PVD-coated grades to suppress built-up edge formation.
Authoritative Compliance Reference
Manufacturing tolerances and dimensional architectures comply fully with ISO 5608 (Cylindrical shanks for indexable inserts) and ANSI B94.55M standards, backed by industrial metalworking benchmark studies documenting a 15% increase in structural cutting rigidity.
Need Help With BEYOND Inserts?
Looking for a BEYOND equivalent, alternative grade, or sample catalog? Our CNC specialists have helped 50+ manufacturers in aerospace, automotive, and medical machining source the right tooling at 30–50% lower cost than OEM prices.
This BEYOND insert is in stock. 24-hour quote response. ISO 9001 certified. Ships from Hangzhou in 3–7 days.
Technical FAQ & Buying Guide
When choosing CNC cutting tools, check the full model code, dimensions, grade and selected variant before ordering. Do not rely on the product image alone.
For carbide inserts, tool holders, drills and end mills, compare the mounting dimensions, connection type and manufacturer's specifications with your holder or machine. If you are unsure, share your existing part number and machining application with us before ordering.
Check the product listing for the selling unit, pack quantity and included components. If it is unclear whether the price is per piece or per pack, or whether a tool body and inserts are sold separately, contact us before purchasing.
Select cutting speed, feed rate and depth of cut using the relevant manufacturer's recommendations for your tool model, workpiece material, machine conditions and coolant method. The same settings are not suitable for every product or application.
Our automatic quantity discount is 6% off for 2–9 items and 12% off for 10 or more items, based on the total product quantity in the cart. Other offers may not combine with this discount; check the applicable offer conditions.
According to our shipping policy, orders are typically processed and shipped within 1–3 business days after confirmation. Delivery generally takes 5–20 business days, depending on your destination and shipping method. Customs clearance or unforeseen delays may affect delivery times. A tracking number is sent by email after shipment.