Tungaloy SC / SP 90° Square Positive Inserts — SCMT, SPGT Steel & Stainless Profiling

22 in-stock 90° square Tungaloy indexable carbide turning inserts covering 2 geometry families (SCMT / SPGT-related milling) and 5 grade families (T9115 / T9125 / NS9530 / AH725 / AH120). IC sizes 7.0-12.0 mm. The go-to positive geometry for general steel profiling and finishing. 2-3 day dispatch from Zhejiang warehouse, DHL/UPS worldwide 3-7 days, all ISO 1832 compliant.

About SC / SP 90° Square Positive Inserts (S-Style)

The ISO 1832 S-shape family delivers a 90° square cutting edge with positive clearance — the most common geometry for general-purpose profiling and finishing on CNC lathes. Tungaloy's S-family in this collection includes:

• SC (7° positive clearance) — 11 SKUs (turning). The dominant 90° positive square insert with chip-breaker. IC sizes 7.0 / 9.0 / 12.0 mm, with PS and 24 chip-breaker variants for steel profiling and finishing.
• SP (11° positive clearance) — 0 SKUs (not currently stocked). Sharper 11° rake for ultra-precision profiling — can be sourced on-demand.
• SPMT (milling) — 5 SKUs (bonus). Square positive milling inserts with PS and 24 chip-breaker variants.
• SDMT / SDMB (milling) — 6 SKUs (bonus). Square positive milling inserts for steel and cast iron face milling.

SC inserts are the workhorse 90° positive square turning insert — used in nearly every production CNC lathe for profiling, semi-finishing, and finishing on steel and stainless. The 90° included angle provides a good balance between edge strength and surface finish. The 7° positive clearance makes SC sharper than SN (negative 90° square) but with more edge support than DC (55° diamond). Common applications include general profiling, shoulder turning, facing, and contouring.

Tungaloy's SC catalog in this collection features the popular PS chip-breaker (precision semi-finishing) and 24 chip-breaker (medium cutting, Tungaloy's general-purpose designation) across 3 IC sizes (07 / 09 / 12) and 4 grade families: T9115 (CVD steel), T9125 (CVD stainless), NS9530 (cermet finishing), and AH725 (PVD steel).

Browse by Application & Grade

All 22 SC / SP SKUs are grouped below by application and grade. Click any category to filter the full catalog.

By Workpiece Material

• Carbon Steel / Alloy Steel — SCMT-PS / -24 T9115 (CVD P-grade, 3+ SKUs)
• Stainless Steel — SCMT-PS / -24 T9125 (CVD M-grade, 3+ SKUs)
• Mirror Finish on Steel — SCMT-PS / -24 NS9530 cermet (5+ SKUs)
• Universal Steel / Stainless — SCMT-PS AH725 (PVD, 2 SKUs)
• Steel Face Milling (Bonus) — SPMT / SDMT / SDMB AH120 (5+ SKUs)

By IC Size

• 7.0 mm (SCMT 07): Small IC, finishing. 1 SKU (SCMT070204-24 NS9530).
• 9.0 mm (SCMT 09T3): Medium IC, general profiling. 8 SKUs across grades.
• 12.0 mm (SCMT 12): Larger IC, heavy profiling. 2 SKUs (120404 / 120408).

By Carbide Grade (Turning)

• T9115 (CVD Steel P-grade) — Tungaloy's CVD grade for steel finishing (P10-P20).
• T9125 (CVD Stainless M-grade) — Tungaloy's CVD grade for stainless with interrupted cuts (M15-M30).
• NS9530 (Cermet) — Tungaloy's premium cermet grade for mirror surface finishing (P05-P15).
• AH725 (PVD Steel) — Tungaloy's premium PVD Al-rich grade for steel and stainless (P10-P25).

By Chip-Breaker (Turning)

• PS (Precision Semi-finishing): 8 SKUs. Tungaloy's premium precision finishing chip-breaker, lighter than 24.
• 24 (Medium Cutting): 3 SKUs. Tungaloy's general-purpose medium-duty chip-breaker for profiling and interrupted cuts.

How to Choose the Right SC 90° Square Positive Insert — 3-Step

Step 1 — Identify the Workpiece

• Carbon steel / alloy steel: SCMT-PS or -24 with T9115 (CVD P-grade).
• Stainless steel 304/316: SCMT-PS or -24 with T9125 (CVD M-grade).
• Mirror finish on steel: SCMT-PS with NS9530 cermet (P05-P15).
• Universal (steel + stainless): SCMT-PS with AH725 (PVD Al-rich).
• Steel face milling (Bonus): SPMT / SDMT / SDMB with AH120 PVD grade.

Step 2 — Pick the Chip-Breaker

• PS (Precision Semi-finishing): Lighter chip-breaker for finishing and profiling at low feed rates.
• 24 (Medium Cutting): General-purpose medium-duty chip-breaker for profiling and interrupted cuts.

Step 3 — Verify Holder Compatibility

• SC (90° positive): Use SSSC, SCLC, or SRSC positive turning holder with square pocket.
• Verify lead angle: 90° matches SCMT perfectly. Common holders: SSSCR/L 2020-K12 (12 mm IC).
• Match IC to holder pocket: SCMT 07 needs 7 mm pocket; SCMT 09 needs 9 mm; SCMT 12 needs 12 mm.

Frequently Asked Questions

Related Tungaloy & Other Brand Inserts

Need a Specific Tungaloy SC 90° Square Insert Not in Stock?

22 in-stock SKUs (11 turning + 11 milling). For specialty SP (11° positive), SPGT (aluminum profiling), 19+ mm IC heavy profiling, or specific Tungaloy equivalent cross-references (Sandvik / Mitsubishi / Kennametal / Iscar / Walter), request a quote — 24-hour response, 2-3 day dispatch from Zhejiang, DHL/UPS worldwide 3-7 days.