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Description
SPMR 090308 turning insert – 90° square
| Technical data | |
|---|---|
| Side length l | 9.53 mm |
| Insert thickness s | 3.18 mm |
| Inscribed circle diameter IC | 9.525 mm |
| Corner radius rε | 0.8 mm |
| ANSI code | SPMR 322 |
4025 cemented carbide indexable insert – applications and design
single-sided 90° square with a chip breaker for rough turning
The SPMR 090308 turning insert is a square, single-sided indexable insert made of grade 4025 cemented carbide, designed for rough turning steel, cast steel, and stainless steel. Shape S, a square with a 90° corner angle, provides a strong, well-supported corner for cutting with large uncut chip cross sections. The positive geometry with a 11° clearance angle reduces cutting forces and power consumption, making the tool suitable for less rigid workpieces as well. Four corners on one side provide four cutting edges, and the chip breaker on the rake face controls the flow of discontinuous chips with a large cross section and variable thickness.
The SPMR design combines a square profile with a positive chip breaker formed on the rake face. The insert has no mounting hole, so it is secured by a top clamp — a typical solution for rough turning tool holders. The 90° corner angle distributes the load along a long cutting edge and increases resistance to chipping at variable depths of cut. This design handles entry into material with forging or casting allowances well, where chip thickness varies during a single tool pass.
Key benefits of the cemented carbide insert 4025
- Four cutting edges — the square has 4 corners on one side; once a cutting edge becomes dull, simply index the insert in its pocket without changing the tool holder.
- Grade 4025 for ISO P and M groups — cemented carbide for steel and cast steel (P15-P40) and stainless steel (M25-M35).
- Corner radius rε 0.8 mm — a versatile radius for rough turning with variable chip thickness.
- The positive geometry with a 11° clearance angle reduces radial forces and power consumption compared with negative inserts.
- The chip breaker on the rake face controls the flow of discontinuous chips with a large cross section and reduces chip wrapping around the workpiece.
- Dimensions conform to ISO 1832: edge length 9.53 mm, IC 9.525 mm (3/8″), thickness 3.18 mm — compatible with tool holders with a size 09 square pocket.
Square insert applications and cutting data selection
The SPMR 090308 insert (also written without spaces as spmr090308) performs best when rough turning shafts, discs, and forgings made of structural steel and cast steel. Calculate spindle speed using n = 1000·Vc/(π·D): for a shaft with a diameter of 80 mm at Vc = 220 m/min, the result is approximately 875 rpm. Grade 4025 withstands dynamic fatigue loads well, making it suitable for interrupted cutting and large, variable machining allowances. For stainless steel in ISO group M, maintain a constant feed and a continuous coolant supply to minimize work hardening and remove heat from the cutting zone. SPMR 090308 indexable inserts are supplied by the Swedish manufacturer Sandvik.
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Application limitation
Grade 4025 is a general-purpose grade for steel and stainless steel, but it is not intended for hardened steels above 45 HRC — for hard turning, choose an insert with a cubic boron nitride cutting edge CBN. The geometry is single-sided, so the insert provides 4 edges, rather than 8 as in double-sided versions.
Square insert designation decoder according to ISO 1832
how to read the SPMR 090308 code — positions 1–7 of the designation
Designation SPMR 090308 according to the standard ISO 1832: 4 letters describe geometry and construction, 3 numeric codes describe dimensions. Each field has a number, an icon, and a brief description.
Frequently asked questions about the SPMR 090308 insert
number of cutting edges, materials, and nose radius selection
Four — a square has 4 corners, and the positive, single-sided geometry (11° clearance angle) allows only one side of the insert to be used. Once a cutting edge becomes dull, simply index the insert in its pocket without changing the tool holder.
For steel and cast steel in group ISO P15-P40 and stainless steel in group ISO M25-M35. This grade is designed for rough turning that produces discontinuous chips with a large cross section and variable thickness, and withstands dynamic fatigue loads during interrupted cutting.
Only in corner radius: 0.4 mm is used for finishing at low feed rates, 0.8 mm is the general-purpose version, and 1.2 mm is selected for roughing at higher feed rates. The remaining dimensions (IC 9.525 mm, thickness 3.18 mm) are identical.
SPMR has geometry that is positive with a 11° clearance angle and is single-sided, secured by a top clamp. Lower cutting forces and power consumption facilitate machining less rigid workpieces, at the cost of fewer cutting edges (4 instead of 8) than negative inserts.
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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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