Beyond SRAPL1616H12 CNC Turning Tool Holder (16x16mm Left-Hand Shank)
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Beyond SRAPL1616H12 Left-Hand CNC Turning Tool Holder
⚠️ PRODUCTION NOTICE: Carbide Inserts Not Included
Please note that all indexable carbide inserts displayed in our tool holder product images are for operational demonstration, pocket seating clarity, and application layout visualization only. The Beyond SRAPL1616H12 package includes solely the hardened left-hand tool holder body and a matching assembly wrench; indexable cutting inserts must be ordered separately.
1. Product Overview
The Beyond SRAPL1616H12 is an industrial-grade, left-hand external indexable turning tool holder specifically engineered for modern CNC lathe turrets, Swiss-type multi-axis centers, and conventional lathes. Built with a rigid 16x16mm square shank body, this premium tool holder is purpose-designed to accommodate 12mm round carbide inserts—specifically the internationally standardized RPMT 1204 and RPMR 1204 series. Circular cutting geometries possess an inherently high edge strength because they lack a single weak point location like traditional diamond or triangle inserts. This allows mechanical stresses and thermal shocks to distribute evenly across the cutting radius arc, making it highly resistant to micro-chipping. The 11° positive rake clearance profile significantly reduces cutting forces and allows for smooth chip control when back-profiling structural steels, stainless steel components, and tough castings.
2. Product Key Features
- High-Tensile Alloy Matrix: Quenched and tempered to exact industrial HRC specifications to absorb structural vibration during aggressive depths of cut ($Ap$).
- Left-Handed Geometry Efficiency: Optimized specifically for left-hand tool positions, back-copying paths, and unique reverse-spindle tool setups.
- Chemical Matte Black Finish: Features an advanced industrial black oxide treatment that resists rust and minimizes thermal chip welding during high-temperature dry machining runs.
- Unobstructed Center-Screw Clamping: Engineered with a low-profile metric flathead screw mechanism that provides absolute clearance for continuous, high-velocity chip flow.
ISO Tool Designation Nomenclature Diagram
Looking for high-performance indexable cutting inserts calibrated for this left-hand shank?
Browse Compatible RPMT 1204 Inserts Here →3. Technical Specifications & Dimension Conversions
| ISO Specification Parameter | Metric Designation (Standard) | Imperial Cross-Reference Equivalent |
|---|---|---|
| Shank Dimension (H x W) | 16 mm × 16 mm | approx. 5/8" × 5/8" (0.625 × 0.625 inch Shank Size) |
| Overall Tool Length (OAL) | 100 mm | approx. 3.937 inches |
| Compatible Insert Specification | RPMT 1204 MO / RPMR 1204 | RPM. 43 (ANSI Industry Equivalent Standard) |
| Clamping Screw Hardware | M4.0 × 10.0 mm Screw | M4.0 × 10.0 mm Screw |
| Torx Wrench Drive Interface | T15 Flag Wrench | T15 Flag Wrench |
Recommended Industrial Cutting Parameters
| Workpiece Material Family | Cutting Speed ($Vc$) Range | Optimal Feed Rate ($f$) Range |
|---|---|---|
| P (Low-Carbon / Carbon Steel Alloys) | 140 - 260 m/min (460 - 850 SFM) | 0.15 - 0.40 mm/rev (0.006 - 0.016 in/rev) |
| M (Austenitic & Duplex Stainless Steels) | 90 - 170 m/min (295 - 550 SFM) | 0.10 - 0.30 mm/rev (0.004 - 0.012 in/rev) |
| K (Nodular & Grey Cast Irons) | 110 - 220 m/min (360 - 720 SFM) | 0.18 - 0.45 mm/rev (0.007 - 0.018 in/rev) |
4. Product Application Scenarios
The mid-sized 16mm (5/8") left-hand shank block coupled with robust 12mm circular insert profiles excels across specific precision industrial turning steps:
- Left-Hand Back Turning & Copy Profiling: Runs smoothly toward the tailstock or handles distinct reverse spindle turret layouts on compact multi-axis turning setups.
- Medium Casting Roughing: Absorbs cyclic impact forces smoothly when peeling uneven sand castings or hard outer layers.
- Complex Concave Profiling: Offers clean directional approach geometry for machining spherical rollers, ball-seat joints, and custom architectural tooling profiles.
5. Machine Tool & Equipment Compatibility
Machined to tight dimensional tolerances to ensure fast drop-in integration into standard CNC machine setups:
- Secures directly into standard metric 16mm static tool pocket blocks or CNC lathe turrets.
- Fits smoothly on conventional manual engine lathes outfitted with standard imperial tool posts.
- Fully compatible with standard Quick-Change Tool Post assemblies (such as standard QCTP 100 series or AXA tool holder blocks designed for 5/8-inch shanks).
6. Beyond Insert Grade Selection Matrix
Pair your SRAPL1616H12 holder with the appropriate Beyond carbide insert grade substrate to match your raw material stock:
| Beyond Insert Grade | Coating Architecture | Primary Application Profile | ISO Range Class |
|---|---|---|---|
| BY1030 | CVD Thick TiCN + Al2O3 Multi-Layer | Continuous high-speed turning to medium roughing in carbon steel and hard alloy plates. | P15 - P30 |
| BY2015 | Multi-Layered PVD AlTiN Nano-Coating | High thermal resilience for gummy stainless steels (304, 316) and high-temperature superalloys. | M10 - M25 |
| BY4025 | Heavy PVD Ultra-Tough TiAlN Coating | Heavy interruption, rough casting surfaces, and structural low-speed processing environments. | P30 - P45 / M25 - M40 |
7. Operational Troubleshooting Matrix
Problem A: Fine Surface Chatter or Low-Frequency Vibration
Correction: Large 12mm circular profiles on a 16mm shank require an adequate depth of cut ($Ap$) to push cutting pressures axially into the spindle. Increase your feed rate ($f$) or use highly positive-rake indexable inserts.
Problem B: Premature Flank Wear or Crater Formations
Correction: Elevated linear velocity causes localized friction cooking. Reduce your surface speed ($Vc$) or migrate to a premium CVD multi-layer co-extrusion grade (BY1030).
Problem C: Insert Indexing Shifts or Pocket Movement
Correction: Check if micro-chips or compressed dust have settled underneath the pocket pocket seat. Clean thoroughly with an air gun and replace the M4.0 clamping screw if it shows thread wear.
8. Global Customer Experiences
"Perfect 5/8" holder for compact machines" — Raymond J. (United States)
Solid 16mm shank body. Fits our smaller CNC turret perfectly for left-hand back profiling paths on carbon steel rollers. Using with RPMT1204 inserts, it strips off stock with absolutely zero deflection.
"Präzise Plattensitz und hohe Stabilität" — Klaus M. (Germany)
The insert pocket seat is machined cleanly. The 12mm round inserts stay fully locked down and don't micro-rotate during deep profiling cycles. Beyond tool holders offer excellent industrial quality.
"Gambo compatto da 16mm, ottimo" — Stefano T. (Italy)
Very nice matte black finish. Handles rough scale on large cast steel parts easily. Just note that it does not ship with inserts included—you need to buy your RPMT inserts separately.
"圧倒的な剛性とコストパフォーマンス" — Kenji S. (Japan)
The anti-rust black surface treatment is highly durable against hot stringy chips during dry steel roughing. Exceptional price-to-performance ratio compared to premium domestic brands.
"Excellent finish on stainless components" — Malcolm F. (Australia)
We use this holder for running complex back facing steps on 316 stainless pump castings. The 16mm shank coupled with a large round insert handles interrupted cuts beautifully without fracturing the carbide edge.
9. Frequently Asked Questions
Q: What is the exact imperial equivalent size for the SRAPL1616H12 left-hand tool holder shank?
A: The metric 16x16mm square dimensions match directly with a standard 5/8 inch × 5/8 inch tool holder footprint inside traditional imperial tool posts.
Q: Is this tool holder compatible with both RPMT1204 and RPMR1204 insert styles?
A: Yes! The pocket seat accepts all standard 12mm round inserts featuring a 4.76mm thickness ($S1$), including both RPMT 1204 and RPMR 1204 industrial designations.
Q: What screws and wrench come inside the standard packaging?
A: It uses a high-tensile metric M4.0 × 10mm flathead Torx screw. One screw is pre-installed in the pocket seat, and a matching T15 flag-style driver wrench is included in the box.
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.