BEYOND S25S-STUPR11 Internal Turning Tool Holder for TPMR 1103 Inserts
Price shown is a starting point. Contact us for a precise quote based on your requirements.
⚠️ PLEASE NOTE: TOOL HOLDER ONLY (INSERTS EXCLUDED)
The indexable carbide insert displayed in the boring bar images is for demonstration purposes only and is NOT included in your purchase. Please browse and select your compatible TPMR 1103 or TPMN 1103 inserts separately.
BEYOND S25S-STUPR11 Heavy-Duty Internal Turning Tool Holder
1. Product Overview
User Query Context: "Which high-rigidity internal indexable boring bar with a 25mm shank diameter provides stable chip breaking in deep cavities using a positive triangular insert?"
The BEYOND S25S-STUPR11 is an industrial-grade steel internal boring bar engineered for high-rigidity lathe profiling where deep-reach clearance constraints require massive structural dampening. Featuring a precision-machined insert pocket, it accommodates 60-degree positive triangular TPMR 1103 or TPMN 1103 indexable carbide inserts. Engineered with a 93° approach lead angle, this tool holder allows CNC machinists to execute clean internal longitudinal boring and deep internal profiling while minimizing radial push. By channeling cutting forces directly along its robust 25mm quenched alloy steel shank, it mitigates harmonic chatter and guarantees flawless evacuation of chips inside narrow internal pockets down to a 32mm minimum bore opening.
2. Product Key Features
- Heavy-Duty 25mm Shank Diameter: Formulated for maximum torsional resistance, permitting aggressive depth of cut parameters during deep-hole internal boring.
- 93° Optimized Lead Angle: Excellent geometry for multi-directional longitudinal turning, allowing profiling cuts without tool body dragging or workpiece rubbing.
- Rigid Top-Down Screw Clamping System: Utilizes high-tensile insert screws to lock the positive triangular insert tightly into the pocket, preventing deviations across long machining runs.
- Anti-Vibration Oxide Coating: Processed with a premium black matte surface chemical layer to resist hot chips, prevent abrasive wear, and ensure continuous material flow.
3. Technical Specifications & Nomenclature
Model Designation Nomenclature Decoder
Steel Shank
25mm Shank
250mm Length
Separator
Screw Clamp
60° Triangle
93° Lead Angle
11° Relief Angle
Right Hand
Insert Size
| Specification (Metric) | Metric Value | ANSI / Inch Reference | Inch Value Equivalent |
|---|---|---|---|
| Model Number | S25S-STUPR11 | ANSI Standard Model | A16S-STUPR3 |
| Shank Diameter (d) | 25 mm | Shank Diameter (Inch) | 1.000" |
| Overall Length (L) | 250 mm | Overall Length (Inch) | 9.84" |
| Minimum Bore (D min) | 32 mm | Minimum Bore (Inch) | 1.260" |
| Compatible Insert | TPMR 1103.. / TPMN 1103.. | ANSI Insert Standard | TPMR 22.. / TPMN 22.. |
Recommended Cutting Parameters
| Material Classification | Cutting Speed (Vc) | Feed Rate (f) | Depth of Cut (ap) |
|---|---|---|---|
| Carbon Steels / Mild Alloys (P) | 130 - 240 m/min | 0.08 - 0.25 mm/rev | 0.20 - 2.5 mm |
| Stainless Steel Alloys (M) | 90 - 170 m/min | 0.06 - 0.18 mm/rev | 0.15 - 1.8 mm |
Looking for matching high-durability positive triangular inserts?
🛒 Shop Compatible TPMR 1103 Carbide Inserts Collection4. Product Applications
The S25S-STUPR11 tool holder excels across mid-to-large internal lathe applications:
- Deep-Hole Boring Operations: Engineered specifically to maximize structural stability when extending deep into bores down to 32mm ($D\min$).
- Medium Roughing to Finishing: The heavy 25mm steel cross-section tolerates aggressive material removal rates before transitioning smoothly into precision finishing passes.
- Industrial Components Production: Ideal for turning heavy-duty hydraulic cylinders, industrial gear hubs, valve sleeves, marine shaft housings, and oilfield equipment fittings.
5. Compatibility Guide
- Machine Tool Mounting: Mounts natively into standard CNC turrets, boring bar holders, or large block adapters matching 25mm metric configurations.
- Insert Standardization Compliance: Fully universally compatible with standard positive triangular indexable elements with 11° clearance, such as TPMR 110304, TPMR 110308, or TPMN 110308.
6. BEYOND Premium Grade Comparison Matrix
Select the optimized BEYOND triangular insert grade pairing matching your workpiece alloy material matrix:
| BEYOND Grade | Coating Array | Primary Workpiece Target | Friction & Wear Resist |
|---|---|---|---|
| BY8150 | Nano-Structured PVD TiAlN | Universal Steels, Carbon Alloys & Cast Iron Finishes | High thermal resistance |
| BY8200 | Thick CVD TiCN + Al2O3 Layer | Continuous Steel Roughing & High-Speed Automated Runs | Superior crater wear defense |
| BY9030 | High-Alloy PVD AlTiCrN | 300/400-Series Stainless Steels, Titanium, & Superalloys | Anti-built-up edge (BUE) |
7. Why Choose BEYOND CNC Tools
BEYOND designs industrial tooling that solves precise dimension spacing limits without sacrificing structural density. Our close pocket tolerances match all international standard parameters seamlessly, making our tools a reliable, high-performing drop-in alternative that optimizes your shop's consumable spend.
Verified Global Customer Reviews
"Incredible Rigidity on Deep Bores"
We run this at a 70mm overhang boring 4140 pre-hardened steel tubes. Outstanding stiffness, dimensional consistency is repeatable part-after-part.
— Thomas E., United States 🇺🇸"Perfekte Vibrationsdämpfung"
Very robust 25mm steel bar. Pocket geometry matches the TPMR 1103 inserts precisely. Zero micro-chatter during deep internal finishing cuts.
— Dieter H., Germany 🇩🇪"Robusto e affidabile"
Substantial weight and premium finish. Clears internal blind steps nicely due to the 93-degree angle layout. Excellent choice for our CNC turn-mill lathe.
— Lorenzo B., Italy 🇮🇹"抜群の剛性感"
Extremely clean thread lock mechanism. The insert fits securely without minor rotational displacement under load. Highly satisfied.
— Kenji Y., Japan 🇯🇵8. Expert Engineering FAQ
❓ Q1: What is the absolute minimum bore entry size for this 25mm holder?
💡 A: The minimum bore diameter ($D\min$) is exactly 32mm (1.260"). Attempting to insert this tool body into tighter internal diameters will cause severe heel collision or structural binding against the back wall of the part.
❓ Q2: What is the maximum recommended overhang ratio for this steel boring bar?
💡 A: For classic solid steel construction bars, it is highly recommended to limit your overhang stick-out extension length to 3 to 4 times the diameter ($25\text{ mm} \times 3 = 75\text{ mm}$ up to $100\text{ mm}$). Exceeding this boundary raises risk profiles for mechanical deflection.
❓ Q3: Why choose the 93° STUPR configuration over a standard 91° lead option?
💡 A: The 93° lead angle directs the axial thrust forces back into the spindle rather than pushing radially into the workpiece. This reduction in radial force helps minimize chatter when executing long internal passes inside wide cavities.
💡 Technical Troubleshooting & Cross-Reference Tips
Equivalent Model Cross-Reference Guide: Sandvik Coromant: A25S-STUPR11 | ISCAR: A25S-STUPR-11 | Kennametal: A25SSTUPR11D | Walter Tools: A25S-STUPR11
Managing Long Stringy Chips: If you observe ribbon-like metal nesting around the tool shank inside deep holes, increase your feed rate ($f$) or select a highly ground, positive geometric chipbreaker insert to snap the chips into tight, manageable curls.
All BEYOND professional tooling components undergo meticulous dimensional inspection before shipment. Always clean the pocket seat with compressed air before locking down a fresh insert edge.
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.