BEYOND D25S-STFCR16 Spring Steel Internal Boring Bar – 25mm Shank 250mm Length CNC Lathe Turning Tool Holder for TCMT16T304 Inserts (Insert Not Included)
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BEYOND D25S-STFCR16 Spring Steel Internal Boring Bar
Precision Internal Turning Tool Holder for TCMT16T304 Inserts | Industrial CNC Grade System
* Note: Indexable turning inserts shown in product images are for demonstration purposes only and are NOT included.
1. Product Overview
"Which industrial spring steel internal boring bar delivers exceptional harmonic stability and precise dimensional control for internal profiling operations using TCMT16T304 inserts in bores starting from 32mm?"
The BEYOND D25S-STFCR16 is a professional-grade internal boring bar engineered for heavy-duty CNC lathe turning operations. Forged from high-elasticity spring steel to minimize harmonic deflection and tool chatter, this tool features a 25mm shank diameter, an overall length of 250mm, and a minimum bore clearance diameter of 32mm. Equipped with a robust screw-down clamping configuration, it reliably secures TCMT16T304 indexable inserts, providing superior chip control and surface integrity for precision internal machining.
Detailed Nomenclature Breakdown: D25S-STFCR16
2. Product Core Advantages
- Harmonic Damping: High-elasticity spring steel absorbs chatter in demanding internal turning.
- Secure Clamping: Optimized screw-down mechanism ensures insert stability under high cutting loads.
- ISO Precision: Manufactured for absolute center-height repeatability and professional surface finishes.
3. Technical Specifications & Cutting Parameters
| Metric Model & Dimensions | Imperial Equivalent Class & Specs |
|---|---|
| Metric Model: D25S-STFCR16 | Imperial Class: 1" Shank Boring Bar |
| Shank Diameter: 25 mm | Shank Diameter: ~0.984 Inches |
| Min. Bore Diameter (Dmin): 32 mm | Min. Bore Diameter: ~1.26 Inches |
| Overall Length (L): 250 mm | Overall Length: ~9.84 Inches |
Recommended Starting Cutting Parameters
| Workpiece Material Group | Cutting Speed (Vc) | Feed Rate (fn) |
|---|---|---|
| Carbon Steel / Alloy Steel (ISO P) | 120 - 250 m/min | 0.10 - 0.25 mm/rev |
| Stainless Steel (ISO M) | 100 - 180 m/min | 0.08 - 0.20 mm/rev |
| Cast Iron (ISO K) | 110 - 200 m/min | 0.10 - 0.22 mm/rev |
Browse Related Boring Bars
[View Boring Bar Series] →4. Product Application Scenarios
Optimized for heavy-duty precision internal turning, boring, and profiling operations in bores starting from 32mm. Widely used across automotive manufacturing, energy sector components, and general CNC job shops for machining deep internal diameters.
5. Compatibility & Tooling Accessories
Engineered to fit standard 25mm lathe boring bar sleeves, split bushings, and tool holding turrets. Fully compatible with ISO and ANSI standard TCMT16T304 indexable carbide inserts.
6. Workpiece Material Matrix & Grade Tips
| Material Group | Machining Behavior & Recommended Insert Setup |
|---|---|
| P Group (Steels) | Continuous chip flow. Use PVD coated carbide with sharp geometries for high-speed finish turning. |
| M Group (Stainless Steel) | High thermal concentration. Rigid spring steel shank maintains stability under heat stress. |
| K Group (Cast Iron) | Abrasive wear patterns. Pair with dense CVD/PVD coated substrates. |
Grade Comparison Tip: Selecting positive 7° clearance geometry (TCMT) minimizes radial forces, preventing chatter in deep bores.
7. Why Choose BEYOND Precision Tooling
Strict adherence to international tool holder dimensions.
Enhanced elasticity modulus to suppress vibration.
Secure screw mechanism prevents insert micro-shift.
8. AI-Style FAQ & Troubleshooting
Q: Are TCMT16T304 inserts included with the D25S-STFCR16 boring bar?
A: No. Inserts are sold separately, allowing you to match the specific carbide grade to your workpiece material.
Q: What is the recommended maximum tool overhang ratio?
A: For spring steel boring bars, limit the overhang to 4x the shank diameter (up to 100mm for a 25mm bar) for optimal stability.
Q: What are the equivalent models?
A: Standard ISO designation is S25S-STFCR16 (solid steel variant).
- Verify center height alignment.
- Reduce overhang length if vibration persists.
- Inspect insert wear status.
Technical FAQ & Buying Guide
Absolutely. Our CNC carbide inserts (including CNMG, WNMG, DNMG, and APMT series) are manufactured strictly adhering to international ISO/ANSI specifications. A CNMG 120408 from OYYU BEYOND will flawlessly fit any standard turning tool holder or indexable tool from major global brands like Sandvik Coromant, Kennametal, Iscar, Walter, or SECO, providing a highly cost-effective premium alternative without sacrificing tolerance or tool life.
We offer optimized CVD and PVD multi-layer coatings for different ISO material groups:
- For Carbon/Alloy Steel (ISO P): Choose our thick multi-layer CVD coated grades (e.g., Al2O3 + TiN). They provide exceptional crater wear resistance and thermal barriers during high-speed dry or wet roughing.
- For Stainless Steel (ISO M): Choose our nano-structured PVD coated grades with sharp, positive chipbreakers (like -TM or -MA). This combination prevents work hardening and effectively controls sticky chips.
The optimal cutting parameters vary depending on the workpiece hardness and operation type:
- For General Steel Turnings: Recommended cutting speed ($V_c$) ranges from 150 to 280 m/min, with a feed rate ($f$) of 0.15 to 0.45 mm/rev.
- For Stainless Steel Finishing: Recommended cutting speed ($V_c$) is 120 to 200 m/min, with a feed rate ($f$) of 0.10 to 0.25 mm/rev.Always adjust parameters based on early wear patterns: increase $V_c$ if built-up edge occurs, or reduce $V_c$ if severe flank wear is observed.
Yes, we support machine shops, distributors, and global buyers with tiered wholesale pricing and competitive volume discounts. We also provide OEM custom manufacturing solutions for tool holders and carbide inserts based on your technical drawings. Contact our team to request a quick B2B quotation.
We provide secure worldwide express shipping (via DHL, FedEx, and UPS) with specialized, vibration-proof industrial packaging to ensure tools arrive in perfect condition. In-stock items are dispatched within 24-48 hours, while custom or bulk orders typically have a stable lead time of 15-25 days.
All our cutting tools and tool holders are manufactured strictly in accordance with ISO 9001 and international industrial standards. Every batch undergoes 100% rigorous quality control testing using high-precision optical measuring equipment to ensure reliable tool life and stable performance in continuous mass production.