Tungaloy DC 55° Diamond Positive Inserts — DCMT, DCGT Steel Profiling, Finishing & Copy Turning

30 in-stock 55° diamond Tungaloy indexable carbide turning inserts covering 2 geometry families (DCMT / DCGT) and 7 grade families (T9115 / T9125 / NS9530 / AH725 / SH725 / SH730 / J740). IC sizes 7.0-11.0 mm. The workhorse 55° diamond for general profiling and finishing on CNC lathes. 2-3 day dispatch from Zhejiang warehouse, DHL/UPS worldwide 3-7 days, all ISO 1832 compliant.

About DC 55° Diamond Positive Inserts (D-Style)

The ISO 1832 D-shape family delivers a 55° rhombic cutting edge with positive 7° clearance — one of the most common geometries for general profiling, copy turning, and finishing on CNC lathes. Tungaloy's D-family in this collection includes:

• DCMT (M chip-breaker, M tolerance) — 16 SKUs. The workhorse 55° positive diamond with chip-breaker on both faces. IC sizes 7.0 / 11.0 mm, with PS (precision semi-finishing) and 24 (medium cutting) chip-breaker variants.
• DCGT (G chip-breaker, G tolerance) — 14 SKUs. Ground-periphery cermet finishing insert with chip-breaker on one face. Premium 55° positive for mirror surface work on steel.

DC inserts are the go-to 55° positive diamond turning insert — the 55° included angle provides a sharper edge than 80° CC (positive diamond) but more edge support than 35° VB (positive diamond). Common applications include general profiling, semi-finishing, and finishing on steel, stainless, and aluminum. The 55° diamond has the smallest nose radius per IC size, making DC ideal for sharp profiling.

Tungaloy's DC catalog in this collection features 7 grade families with Tungaloy's specific naming: T9115 / T9125 (CVD steel / stainless, similar to Mitsubishi), NS9530 (cermet), AH725 (PVD steel), SH725 / SH730 (Tungaloy's premium PVD grades for steel finishing), and J740 (Tungaloy's CVD stainless grade). 3 chip-breaker variants: PS, 24, JS (Tungaloy's premium sharp geometry for cermet).

Browse by Application & Grade

All 30 DC 55° positive diamond SKUs are grouped below by application and grade. Click any category to filter the full catalog.

By Workpiece Material

• Carbon Steel / Alloy Steel — DCMT-PS T9115 (CVD P-grade, 3+ SKUs)
• Stainless Steel — DCMT-PS T9125 (CVD M-grade, 3+ SKUs)
• Mirror Finish on Steel — DCMT / DCGT NS9530 cermet (8+ SKUs)
• Premium Steel Finishing — DCGT-JS / -J10 SH725 / SH730 / AH725 (10+ SKUs)
• Universal (steel + stainless) — DCMT-PS AH725 (PVD, 3+ SKUs)

By IC Size

• 7.0 mm (DCMT 0702): Small IC, profiling. 6 SKUs across grades.
• 11.0 mm (DCMT 11T3 / DCGT 11T3): Medium IC, general profiling. 24 SKUs across grades.

By Carbide Grade (7 Tungaloy families)

• T9115 (CVD Steel P-grade) — Tungaloy's standard 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).
• SH725 (PVD Premium Steel) — Tungaloy's premium PVD grade for steel finishing (P05-P15).
• SH730 (PVD Premium Steel) — Tungaloy's premium PVD grade for steel finishing with higher wear resistance (P10-P20).
• J740 (CVD Stainless) — Tungaloy's CVD grade for stainless steel finishing (M05-M15).

By Chip-Breaker (3 Variants)

• PS (Precision Semi-finishing): 12+ SKUs. Tungaloy's standard precision finishing chip-breaker for DCMT.
• 24 (Medium Cutting): 4+ SKUs. Tungaloy's general-purpose medium-duty chip-breaker for profiling.
• JS (Precision Sharp, DCGT only): 8+ SKUs. Tungaloy's premium sharp chip-breaker for cermet mirror finishing.
• J10 (Ultra-Sharp, DCGT only): 3+ SKUs. Tungaloy's ultra-sharp chip-breaker for finest surface finish.

How to Choose the Right DC 55° Positive Diamond Insert — 3-Step

Step 1 — Identify the Workpiece

• Carbon steel / alloy steel: DCMT-PS with T9115 (CVD P-grade).
• Stainless steel 304/316: DCMT-PS with T9125 (CVD M-grade).
• Mirror finish on steel: DCMT or DCGT with NS9530 cermet.
• Premium steel finishing (PVD): DCGT with SH725 / SH730 / AH725.
• Stainless steel finishing (CVD): DCGT with J740.
• Universal (steel + stainless): DCMT-PS with AH725 (PVD Al-rich).

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.
• JS (Precision Sharp, DCGT only): Premium sharp chip-breaker for cermet mirror finishing.
• J10 (Ultra-Sharp, DCGT only): Ultra-sharp chip-breaker for finest surface finish.

Step 3 — Verify Holder Compatibility

• DC (55° positive): Use Tungaloy SDJC-type positive turning holder with 55° lead angle, or PDJN-type positive holder.
• Verify lead angle: 55° matches DC perfectly. Common holders: SDJCR/L 1616-H11 (11 mm IC), SDJCR/L 2020-K11.
• Match IC to holder pocket: DCMT 07 needs 7 mm pocket; DCMT 11 needs 11 mm.

Frequently Asked Questions

Related Tungaloy & Other Brand Inserts

Need a Specific Tungaloy DC 55° Diamond Insert Not in Stock?

30 in-stock SKUs covering DCMT / DCGT in 7 grade families. For specialty DNMT (negative 55°), DPMT, 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.