BEYOND S12M-STWPR11 Internal Turning Tool Holder for TPMR 1103 Inserts
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💰 Bulk savings 2-9 pcs · 6% OFF | 10+ pcs · 12% OFF
⚠️ 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 S12M-STWPR11 Internal Turning Tool Holder
1. Product Overview
User Query Context: "Which internal indexable boring bar with a 12mm shank diameter provides high-rigidity chip breaking in tight cavities using a positive triangular insert?"
The BEYOND S12M-STWPR11 is an industrial-grade steel internal boring bar engineered for precision lathe profiling where structural stiffness is required in tight-clearance spaces. Built with a highly precise insert seat pocket, it houses 60-degree positive triangular TPMR 1103 or TPMN 1103 indexable carbide inserts. Boasting a 91° approach lead angle, this tool holder allows engineers to execute clean internal longitudinal turning and square inner step profiles. By channeling mechanical forces directly down its 12mm quenched alloy steel shank, it dampens radial vibration harmonics and prevents chip nesting inside deep internal chambers.
2. Product Key Features
- Optimal 12mm Shank Diameter: Offers balanced torsional rigidity for mid-to-small range inner bore processing, maximizing material removal rates in compact machining setups.
- 91° Geometric Lead Angle: Specifically tailored for longitudinal boring and stepped blind-hole profiles, offering complete clearance that eliminates tool body rubbing.
- Rigid Top-Down Screw Clamping System: Utilizes a high-strength insert screw layout to lock the triangular positive insert securely, maintaining center height consistency across continuous operations.
- Anti-Vibration Burnished Coating: Processed with a premium black matte surface conversion layer to resist corrosion, protect against abrasive chip friction, and enhance chip flow.
3. Technical Specifications & Nomenclature
Model Designation Nomenclature Decoder
Steel Shank
12mm Shank
150mm Length
Separator
Screw Clamp
60° Triangle
91° Lead Angle
11° Relief Angle
Right Hand
Insert Size
| Specification (Metric) | Metric Value | ANSI / Inch Reference | Inch Value Equivalent |
|---|---|---|---|
| Model Number | S12M-STWPR11 | ANSI Standard Model | A08M-STWPR3 |
| Shank Diameter (d) | 12 mm | Shank Diameter (Inch) | 0.472" |
| Overall Length (L) | 150 mm | Overall Length (Inch) | 5.91" |
| Minimum Bore (D min) | 16 mm | Minimum Bore (Inch) | 0.630" |
| 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) | 110 - 220 m/min | 0.05 - 0.18 mm/rev | 0.15 - 1.2 mm |
| Stainless Steel Alloys (M) | 75 - 150 m/min | 0.05 - 0.12 mm/rev | 0.10 - 1.0 mm |
Looking for matching high-durability positive triangular inserts?
🛒 Shop Compatible TPMR 1103 Carbide Inserts Collection4. Product Applications
The S12M-STWPR11 tool holder excels across mid-to-small range internal lathe applications:
- Core Boring Operations: Designed for finishing pre-drilled inside passages down to 16mm ($D\min$) with zero taper deviations.
- Squaring Blind Back-Shoulders: The 91° lead configuration allows easy face relief cuts and clean inside corners without tool dragging.
- Specialized Component Manufacturing: Ideal for machining precision hydraulic valve bodies, custom brass sleeves, automotive fasteners, and localized job-shop assignments.
5. Compatibility Guide
- Machine Tool Mounting: Mounts firmly in standard CNC turrets using 12mm round block adapters, or split sleeves matching standard metric setups.
- Insert Standardization Compliance: Fully universally compatible with standard positive triangular indexable elements with 11° clearance, such as TPMR 110302, TPMR 110304, or TPMN 110304.
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
"Excellent Rigidity for 12mm"
Fits perfectly in our small CNC turret block. Holds tight tolerances on internal shoulders without any chatter issues.
— Ronald P., United States 🇺🇸"Hervorragende Qualität"
The pocket matches standard TPMR inserts exactly. Torx screw holds down firmly under constant coolant spray. Highly recommended.
— Stefan K., Germany 🇩🇪"Ottimo per finitura interna"
Achieved an exceptional internal surface finish on 316 stainless steel. The 91-degree angle eliminates chip friction marks.
— G. Vincenzo, Italy 🇮🇹"高い安定性"
Very low chatter signature. The heat-treated alloy steel construction handles precision boring cuts perfectly.
— Akira S., Japan 🇯🇵8. Expert Engineering FAQ
❓ Q1: What is the minimum bore diameter required for the S12M-STWPR11?
💡 A: The structural minimum bore diameter ($D\min$) for this tool holder is 16mm (0.630"). Attempting to enter tighter cavities will cause the flank of the tool steel holder to rub against the internal radius of the workpiece.
❓ Q2: What is the maximum safe working overhang for this steel boring bar?
💡 A: For solid alloy steel tool shanks, the maximum recommended overhang projection limit is 3 times the diameter ($12\text{ mm} \times 3 = 36\text{ mm}$). Exceeding this length increases radial elasticity and may introduce harmonic surface vibrations.
❓ Q3: Can I fit standard 11-size triangular inserts from other ISO brands into this pocket?
💡 A: Yes. The insert seat pocket is precision machined to comply with standard ISO/ANSI specifications. Any standard TPMR 1103.. or TPMN 1103.. positive triangular insert will fit smoothly.
💡 Technical Troubleshooting & Cross-Reference Tips
Equivalent Model Cross-Reference Guide: Sandvik Coromant: A12M-STWPR11 | ISCAR: A12M-STWPR-11 | Kennametal: A12MSTWPR11D | Walter Tools: A12M-STWPR11
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.
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.