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.
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.