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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 |
| Grade | NT35 |
| Manufacturer | Baildonit |
NT35 carbide indexable insert – applications and design
single-sided 90° square with positive geometry and a chip breaker
The SPMR 090308 turning insert is a square indexable insert made of NT35 grade cemented carbide by the Polish manufacturer Baildonit, designed for turning steel and cast steel. Shape S, a square with a 90° corner angle, forms a short, rigid corner that withstands loads during longitudinal turning and facing. The positive geometry with a 11° clearance angle (letter P) denotes a single-sided insert with four usable corners on one face. The chip breaker formed on the rake face controls chip flow and breaking, and the insert is secured by a top clamp, with no hole in the insert.
Key features of the NT35 cemented carbide insert
- Four cutting edges — the square provides 4 corners of 90° each on one side; once a corner becomes dull, index the insert in its pocket without replacing the tool holder.
- Strong 90° corner — the square corner distributes heat and forces more effectively than the acute corners of triangular inserts, supporting greater depths of cut.
- Corner radius rε 0.8 mm — a versatile balance between surface finish and edge strength at medium feeds.
- The positive geometry with a 11° clearance angle reduces cutting resistance and power requirements, which helps on less rigid machine tools.
- Tolerance class M ensures repeatable cutting edge positioning after indexing the insert in the clamping pocket.
- Dimensions conform to ISO 1832: side length 9.53 mm, IC 9.525 mm (3/8″), thickness 3.18 mm — confirm tool holder selection against the manufacturer's table.
Square insert applications and cutting data selection
The SPMR 090308 insert (also written without spaces as spmr090308) is suitable for turning shafts, bushings, and flanges made of structural steels and cast steel. Calculate spindle speed using n = 1000·Vc/(π·D): for an example cutting speed of Vc = 200 m/min and a shaft with a diameter of 50 mm, the result is approximately 1273 rpm. The 90° square corner is stronger than the corners of triangular or diamond-shaped inserts, so it withstands greater depths of cut, but it generates higher radial forces — on slender workpieces supported at one end, this increases the risk of vibration. The positive geometry reduces cutting resistance, making it suitable for medium machining and finishing, as well as materials prone to chip adhesion. SPMR 090308 indexable inserts are supplied by the Polish manufacturer Baildonit.
Descriptions of carbide grade NT35 differ across source materials, so the exact application range, ISO class, and coating type should be confirmed in the manufacturer's data sheet before selecting cutting parameters. Regardless of these discrepancies, the insert remains a typical choice for turning steel and cast steel on conventional and CNC machine tools. For the initial run, start with lower speeds and feeds, then increase them while monitoring chip color and cutting edge condition.
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Application limitation
SPMR 090308 is an insert that is positive and single-sided — it provides 4 cutting edges and is less robust than negative, double-sided inserts. For heavy rough turning with a large chip cross section or interrupted machining, a negative insert with more cutting edges is a better choice.
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
design, mounting, and selection of turning parameters
Four — a square has 4 corners of 90° each, but the positive, single-sided geometry (letter P, 11° clearance angle) allows only one face to be used. Once a corner becomes dull, index the insert in its pocket without changing the tool holder.
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. The other dimensions in the SPMR 0903 family (IC 9.525 mm, thickness 3.18 mm) are identical.
For turning steel and cast steel on conventional and CNC machine tools. Descriptions of NT35 cemented carbide may differ across sources, so confirm the exact material range, ISO class, and coating in the Baildonit manufacturer's data sheet before selecting cutting parameters.
The insert is type R — without a hole, with a chip breaker, so it is secured by a top clamp (clamping arm or lever) in a tool holder with a size 09 square pocket. Select a tool holder with an entering angle suited to the operation and verify the pocket against the manufacturer's table.
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| 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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