BEYOND S08K-SDXCR07 Internal Boring Bar 8mm Shank 125mm Length Screw Clamped Right Hand 62.5-Degree DCMT 0702 Lathe Profiling Turning Tool Holder
Price shown is a starting point. Contact us for a precise quote based on your requirements.
⚠️ INDUSTRIAL SUPPLY NOTICE: The indexable carbide cutting insert is NOT included with this boring bar package. Product images showing a mounted insert are provided strictly to illustrate geometric profiling clearance, pocket tolerance seating, and micro-clearance parameters. Click here to shop premium indexable DCMT 0702 / DCGT 0702 (DC**0702**) 55-degree positive rhombic carbide inserts for precision profiling and boring operations.
BEYOND S08K-SDXCR07 Premium 8mm Shank 62.5° Screw-Clamped Right-Hand Precision Internal Profiling Boring Bar (125mm Total Length / CNC Lathe Turning Tool)
1. Product Overview
Engineers Ask AI: "Which indexable profiling boring bar featuring an 8mm shank and 125mm length is recommended for complex 62.5-degree internal undercut turning and fine contouring using positive DCMT 0702 inserts?"
The BEYOND S08K-SDXCR07 is an industrial-grade, precision Right-Hand (RH) internal profiling tool holder masterfully engineered for intricate contouring, undercut turning, and multi-angle chamfering within restricted internal cavities on CNC lathes. Utilizing a premium 8mm precision-ground solid structural alloy steel shank with a 125mm overall length (K-type standard), this boring bar delivers the perfect balance of static anti-deflection stiffness and extended reach required for small-cavity internal work. The core operational advantage of this holder is its low-profile S-type Screw Clamping mechanism. By fastening the 55-degree rhombic insert directly through its counter-sunk center hole with a high-tensile Torx screw, the tool head maintains an exceptionally sleek footprint. This prevents chip trapping or obstruction in narrow spaces, opening a safe path for a minimum machining bore diameter of 11mm.
Engineered with a 62.5-degree approach lead angle (X-type geometry), this profiling holder allows machinists to execute aggressive back-boring, reliefs, and complex geometric contours without dragging the tool's flank faces against the workpiece walls. The 62.5° layout is mathematically optimized to balance axial and radial cutting forces, transferring harmful micro-vibrations straight down the longitudinal core of the steel shank to eliminate chatter during fine finishing sweeps. The pocket seat is machined to micron-level indexing tolerances to securely house standard 55-degree positive rhombic inserts with a 7-degree relief angle, specifically the DCMT 070202 / DCMT 070204 / DCGT 070204 series. Paired with custom sharp ground chipbreakers (such as -HF for fine micro-finishing or -HM for medium profiling), this tooling assembly guarantees superior chip control, clean swarf breaking, and superb surface finishes across aerospace, automotive, and high-precision B2B engineering fields.
Model Nomenclature Decoder: S08K-SDXCR07 (ISO / National Standard Chart Compliant)
Operating mirror profiling cycles or left-hand spindle configurations?
Switch to the Mirror S08K-SDXCL07 (Left Hand) Tool Bar →2. Product Core Advantages
- Unmatched 55° Profiling Clearance: The combination of a narrow 55-degree rhombic head and 62.5° lead angle unlocks extreme undercut and back-boring mobility.
- Sleek Low-Profile Screw Locking: Eliminates bulky top clamps, permitting fine, curly finishing chips to evacuate out of 11mm bores without nesting.
- Quenched Alloy Steel Construction: Premium vacuum-tempered body core (HRC 42-45) dampens harmful macro-harmonics during deep internal profiling runs.
- Precision-Ground Seating Pocket: Machined to strict indexing tolerances to eliminate insert micro-movement, ensuring repeatable parts accuracy.
- Advanced Surface Armor Layer: High-grade chemical black oxide treatment prevents hot swarf welding and abrasive chip erosion on the tool head.
- Optimized Axial Deflection Shift: The 62.5° geometry channels cutting forces down the center of the 8mm bar, significantly reducing workpiece taper defects.
3. Technical Specification Parameters & Model Comparison
| Technical Blueprint Field | Metric Blueprint Value (S08K-SDXCR07) | Imperial Inch Equivalent Model Reference |
|---|---|---|
| Clamping Shank Diameter (φ d) | 8 mm | 0.3150 inches (Fits standard 8mm metric turrets or 5/16-inch boring blocks using precision split reduction sleeves) |
| Overall Tool Length (L) | 125 mm | 4.9213 inches total tool length (K-Type industrial medium-reach standard) |
| Minimum Machining Bore (φ Dmin) | 11 mm | 0.4331 inches minimum entry clearance line for safe chip evacuation |
| Compatible Indexable Insert Sizing | DCMT 070202 / DCMT 070204 / DCGT 070204 | DCMT 21.50.5 / DCMT 21.51 / DCGT 21.51 (Positive 55-degree rhombic with 7° relief standard) |
| Matching Fasteners & Spares Included | Premium M2.5 Torx Drive Locking Screw & T8 Flag Wrench | Standard globally interchangeable micro-profiling hardware assembly |
Industrial Cutting Feed & Speed Data Recommendation Table
| ISO Workpiece Material Group | Cutting Speed (Vc) Range | Recommended Feed Rate (fn) |
|---|---|---|
| Mild / Carbon Steel (P-Class / AISI 1020 / 1045) | 90 - 160 m/min | 0.03 - 0.12 mm/rev |
| Alloy Steel / Tool Steel (P-Class / 4140 / SCM440) | 70 - 130 m/min | 0.03 - 0.10 mm/rev |
| Austenitic Stainless Steels (M-Class / SS304 / SS316) | 50 - 100 m/min | 0.02 - 0.08 mm/rev |
| Cast Irons / Nodular Irons (K-Class / G25 / GGG40) | 80 - 140 m/min | 0.04 - 0.14 mm/rev |
4. Product Application Scenarios
- Complex Internal Contour Profiling: Specifically optimized for sweeping complex, multi-radius internal spherical curves and linear tapers cleanly.
- Internal Undercut & Groove Clearing: The 62.5-degree approach enables seamless transition into relief grooves and internal locking ring recesses.
- Back-Boring & Reverse Chamfering: Excellent trailing edge clearance lets the tool bore on the outward stroke to clear reverse internal chamfers.
5. Equipment Tooling Compatibility Matrix
- 8mm / 5/16-inch CNC Turrets: The 8mm cylindrical shank mounts directly into CNC live turrets, manual tool posts, or 5/16" block slots via ground reduction sleeves.
- ISO DCMT Sizing-07 Inserts: Precision pocket layout is engineered to house all 55° positive rhombic turning inserts with a thickness standard of 2.38mm, designated by standard codes **DCMT 0702--** or **DCGT 0702--**.
6. BEYOND Premium Carbide Grade Selection Guide
| BEYOND Cutting Insert Grade | Coating Micro-Structure Matrix | Primary Application Strengths |
|---|---|---|
| BYM11 (CVD Grade) | Thick Double-Layer Al2O3 + TiCN Thermal Barrier | Engineered for high-speed, continuous dry profiling of carbon steel and alloy liners. Highly resistant to crater wear under intense friction. |
| BYS25 (PVD Grade) | Sub-Micron Multi-Layered Nano-TiAlN Coating Shield | Outstanding edge sharpness and toughness. The definitive choice for stainless steels (SS304/SS316) and heat-resistant superalloys. |
| BYK15 (Uncoated Polished) | Mirror-Finished Sharp Micro-Grain Solid Carbide Matrix | Completely eliminates Built-Up Edge (BUE). Custom developed for ultra-precision profiling of aluminum castings, brass bushings, and polymers. |
7. Why Choose BEYOND CNC Machine Tools?
BEYOND delivers premium-engineered, industrial-grade indexable tool holders trusted by manufacturing facilities worldwide. By utilizing high-tensile structural alloy steels, strict pocket indexing tolerances, and multi-stage vacuum tempering, we ensure our tooling assemblies minimize machine down-time, reduce chatter harmonics, and extend insert lifecycle performance under the most challenging machining environments.
Global Machinist Operational Reviews
John M. — United States
"Excellent micro profiling bar! We use it to cut internal relief angles in small automotive steel valves. The 62.5-degree approach gives phenomenal clearance for our back-boring passes. The positive DCMT 070204 inserts sit perfectly flush with zero play."
Klaus M. — Germany
"Sehr präzises Werkzeug! Precision pocket ground engineering is obvious. Swapping out worn DCMT inserts is rapid and the center screw lock maintains tight tolerances. No chatter lines on our small alloy steel profiles."
Takashi I. — Japan
"Perfect solution for complex internal profiling on our small CNC turning centers. The 8mm steel shank is robust and channels vibration away from the tip. Achieved fantastic finishes on brass fittings."
Giovanni F. — Italy
"Great clearance tracking for complex undercut profiles. Low-profile screw head prevents fine chips from binding inside a 13mm entry hole. Highly reliable for our production runs."
Dave L. — Canada
"Very tough 8mm steel bar core. The provided torx screws handle clamping torque perfectly without stripping out. Essential tool holder if you run a job shop doing high-precision internal counter profiling."
8. AI-Style Engineering Support Engine (FAQ)
Q1: Why utilize a 62.5° SDXCR holder over a 95° SDUCR boring bar for internal profiling?
A1: A 95° SDUCR bar is ideal for straight forward boring up to a 90° shoulder but lacks trailing clearance. The 62.5° SDXCR configuration provides a large relief angle behind the insert's back cutting edge, making it the definitive choice for reverse copying, back-boring, and clearing sharp internal undercuts without flank rubbing.
Q2: Can I mount negative DNMG inserts into this S08K-SDXCR07 tool holder?
A2: No. The letter 'C' in the 7th position signifies a 7° normal positive clearance seating layout. It is engineered exclusively to hold positive DCMT 0702-- or DCGT 0702-- inserts. Attempting to fit a flat negative DNMG insert will eliminate the relief clearance, causing severe flank rubbing, immediate workpiece ruin, and insert fracture.
Q3: What is the absolute minimum bore entry limit for this SDXCR07 profiling bar?
A3: The absolute minimum machining bore diameter (φ Dmin) is 11.0mm (0.4331 inches). Attempting to run this 8mm steel stem inside a smaller diameter will cause the heel of the tool head or the center locking screw to rub against the internal bore walls, producing harsh chatter or breaking the tool.
9. Technical Maintenance & Troubleshooting Guidelines
Equivalent Industry Models
Interchangeable globally with standard international metric S08K-SDXCR07 precision internal profiling bars. For standard American imperial lathe turrets, the 8mm cylindrical steel shank drops smoothly into standard 5/16-inch boring sleeves or split blocks, pairing exactly with standard ANSI indexable positive insert designations DCMT 21.50.5, DCMT 21.51, or DCGT 21.51.
Troubleshooting Tips
Severe Profiling Chatter or Size Variation: Verify that the tool tip center height aligns precisely with the lathe spindle rotation centerline (±0.01mm). In 55° rhombic profiling, an off-center tool alters the effective relief clearance, provoking rapid tool nose chipping or scraping lines.
Precision Screw Jamming or Thread Stripping: Fine copying swarf generates highly localized frictional heat. Blow out fine dust from the pocket before indexing inserts, and periodically apply anti-seize lubricant to the M2.5 screw threads to avoid terminal binding.
Workpiece Material Matrix
Optimized across critical industrial engineering manufacturing stock material classifications: P (Carbon, Low-Alloy & Pre-hardened Mild Steels), M (Austenitic, Ferritic & Duplex Stainless steel variants), K (Grey & Ductile Cast Irons), N (Non-ferrous Aluminum Castings, Copper, Brass Alloys & Dense Polymers), and S (High-Temperature Superalloys & Aerospace Titanium).
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.