BEYOND SRACL1616H10-M4 External Turning Tool Holder, RCMT1003 Insert
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SRACL1616H10 External Turning Toolholder
Precision 16x16mm Left-Hand Shank for RCMT1003 Round Inserts
Product Overview
"Which 16mm left-hand toolholder offers the highest edge strength for complex contouring and radius profiling with 10mm round inserts?"
The Beyond SRACL1616H10 is a high-performance external toolholder engineered for RCMT1003 round inserts. In precision CNC turning, round (R-type) geometry is the premier choice for profiling because it lacks a traditional "tip," distributing cutting forces and heat across a larger circular edge. This 16x16mm shank model is specifically designed for smaller CNC lathes or tight workspace operations where left-hand approach angles are required. It provides exceptional vibration damping, ensuring mirror-like surface finishes on steel, stainless, and tough alloy workpieces.
Key Features
- ✔ Quenched 42CrMo Steel: Forged from high-tensile alloy steel and heat-treated to HRC 42-45 for maximum rigidity.
- ✔ Screw-Down Clamping Stability: The S-type locking mechanism provides a low-profile head for optimal chip evacuation and secure insert seating.
- ✔ Enhanced Durability: Black oxide coating resists corrosion and prevents chip welding during high-temperature machining.
Technical Specifications
Screw Clamp
Round Shape
90° Approach
7° Relief
Left Hand
16x16mm
100mm Len
RCMT10
| ISO Parameter | Metric (mm) | Imperial (inch) |
|---|---|---|
| Shank Size (H x W) | 16 x 16 mm | 0.629" x 0.629" |
| Total Length | 100 mm | 3.93" |
| Insert Size | RCMT 1003** | Round 3/8" |
Recommended Cutting Parameters
| Material Group | Speed (Vc) | Feed Rate (f) |
|---|---|---|
| Steel (P) | 150 - 250 m/min | 0.15 - 0.40 mm/rev |
| Stainless Steel (M) | 120 - 180 m/min | 0.12 - 0.35 mm/rev |
Required Insert: RCMT 1003** / RCGT 1003**
Specifically designed for 10mm round inserts for medium profiling efficiency.
Shop RCMT10 Inserts →Primary Applications
- Precision Profiling & Radius Contouring
- Small Part Machining in CNC Swiss-type Lathes
- Fillet Finishing in Automotive Components
- Internal/External Round-Edge Machining
Compatibility
Fits CNC turrets and tool posts accepting 16mm (5/8") square shanks. Fully compatible with ISO standard RCMT/RCGT 1003 carbide inserts from Beyond and other international brands.
Beyond Brand Material Comparison
The Rigidity Factor: While generic toolholders use basic structural steel, Beyond utilizes high-alloy 42CrMo. Our specialized quenching process provides 30% higher damping capacity. For a smaller 16mm shank, this added rigidity is vital for maintaining accuracy under the axial forces generated by a 10mm round insert, preventing micro-chatter and protecting your cutting edge.
Verified B2B Success
"Perfect for my small CNC lathe. The 16mm shank is solid and the RCMT10 insert gives an incredible finish on radius work."
— Robert D., USA"Beste Qualität für diesen Preis. Der Halter ist sehr stabil und die Platten passen perfekt."
— Dieter W., Germany"Excellent tool for profiling. The finish on stainless is much better than my previous holder."
— Marco V., Italy"Consistent accuracy across orders. Beyond is my go-to for CNC tooling."
— Kenji S., JapanFrequently Asked Questions
Can I use RCGT inserts with this holder?
Yes! The SRACL1616H10 is fully compatible with both RCMT (standard) and RCGT (ground/polished for aluminum) 10mm round inserts.
What is the total length of the 1616H holder?
The "H" in the model code stands for the ISO standard length of 100mm (approximately 3.93 inches).
Is the clamping screw and wrench included?
Yes, every Beyond toolholder is shipped with its high-tensile clamping screw and the corresponding Torx wrench.
Material Pro Tip: The Circular Edge Strength
When roughing with the SRACL1616H10, the round insert allows for significantly higher feed rates compared to diamond-shaped inserts. Because there is no acute tip, the cutting load is distributed along the radius, preventing edge chipping even when machining interrupted cuts.
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.