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Description
CROSS SECTION 20×20 mm
LENGTH 125 mm
INSERT SNMG 1204rr
ANGLE κr 75°
Technical specifications of the MSBNR 20X20 12 turning tool
| Technical Data | |
|---|---|
| ISO designation | MSBNR 20X20 12 |
| Shank height (h) | 20 mm |
| Shank width (b) | 20 mm |
| Overall length (L) | 125 mm |
| Functional overhang (f) | 25 mm |
| Entering angle (κr) | 75° |
| Clearance angle | 0° (negative) |
| Clamping system | ISO — combination (M) |
| Insert type | SNMG 1204rr |
| Cutting direction | R — right-hand |
| Manufacturer | Varel |
Turning tool MSBNR 20X20 12 – for longitudinal turning and profiling
Professional 20×20 mm indexable turning tool for an SNMG insert
Turning tool MSBNR 20X20 12 is a professional turning tool designed for external turning on conventional and CNC lathes. The shank with a cross section of 20×20 mm and a length of 125 mm provides the rigidity required for industrial machining. The geometry with an entering angle of 75° enables longitudinal turning with undercutting while maintaining good access to the machined surface.
The combination clamping system (M) ensures maximum clamping rigidity and quick replacement of the SNMG 1204rr insert. The negative geometry of the 90° square insert with 8 cutting edges is suitable for roughing and medium machining, providing high cutting edge strength and cost efficiency through its double-sided design. The tool is compatible with SNMG 12 inserts in various carbide grades — select the grade to match the workpiece material.
Typical applications of the MSBNR 20X20 12 turning tool
Cutting operations:
| ▸ | Longitudinal turning with profiling — the 75° angle provides good access to the workpiece profile |
| ▸ | Roughing and medium machining of steel and cast iron — negative SNMG geometry provides maximum cutting edge strength and 2× more edges |
| ▸ | External taper turning — machining tapered and contoured surfaces |
| ▸ | Undercutting and recess machining — a smaller κr angle allows partial undercutting |
| ▸ | CNC production runs — quick insert replacement and repeatability |
Included
Package contents for MSBNR 20X20 12
Package contents:
| ✓ | Tool body MSBNR 20X20 12 | 1 pcs |
| ✓ | Combination clamp (clamp + pin) | 1 pcs |
| ✓ | Hex key for insert replacement | 1 pcs |
| ✗ | SNMG 1204rr cutting insert (sold separately) | — |
Compatible SNMG 1204rr insert
SNMG 1204rr
The cutting insert is not included in the set — must be purchased separately. SNMG insert. Negative geometry means that the insert is double-sided and has 8 cutting edges, providing maximum cutting edge strength and cost efficiency.
Select the insert grade to match the workpiece material: P (structural steels), M (stainless steel), K (cast iron), N (aluminum). You can find compatible inserts in the section "Related products" below.
Insert installation and replacement for the MSBNR 20X20 12 turning tool
Instructions for the combination clamping system (M)
Insert replacement procedure step by step
1 Loosen the clamp
Loosen the clamping screw 2-3 turns
2 Clean the insert seat
Remove chips and debris
3 Install the insert
Fit onto the pin and press down
4 Tighten the clamp
Torque 1.5–2.5 Nm
Important: Do not exceed the recommended tightening torque — this may damage the thread in the seat or crack the insert.
Checks before starting work:
| ▸ | Tool overhang — do not exceed 1.5× the shank height without support |
| ▸ | Cutting edge height — set the cutting edge at spindle center height (±0.05 mm) |
| ▸ | Insert seat condition — check that the contact surface is not damaged or worn |
| ▸ | Secure clamping — the insert must have no play in the seat |
| ▸ | Indexing — when an edge wears out, rotate the insert to a fresh edge (8 edges in total) |
Note: Use coolant during machining — it extends insert life and improves surface finish. When machining without coolant, reduce the cutting parameters by 20–30%.
Frequently asked questions — MSBNR 20X20 12
This tool accepts inserts SNMG 1204rr in any carbide grade. Select the grade to match the workpiece material: P (steels), M (stainless steel), K (cast iron), N (aluminum). You can find compatible inserts in the "Related products" section below.
The 75° entering angle provides good access to the workpiece profile. It is suitable for longitudinal turning, contour profiling, and recess machining.
The SNMG insert has negative geometry (clearance angle 0°), which means that it is double-sided with 8 cutting edges. When one edge wears out, rotate or flip the insert to use the next edge — this significantly reduces tooling cost per part.
Product accessories
Carbide insert SNMG 120408 MA H6310 Horn
Reference: 0000002922 In stock > 10 items
€5.26
€6.47 brutto
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Shipping
All orders are delivered by courier company GLS. For orders exceeding 369 PLN gross shipping is FREE
| Courier GLS | Przelew24 / Prepayment | 14,76 zł gross | Delivery time 1 working day |
| Courier GLS | Cash on delivery | 17,26 zł gross | Lead time 1 working day |
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