What does RCMT1204 mean?

RCMT1204 is an ISO 1832 insert designation. It decodes as: R — shape = round; C — clearance angle = relief angle 7°; M — tolerance = class M — molded, medium tolerance on inscribed circle and corner point (typically ±0.05–0.13 mm depending on size); T — type = fixing hole with countersink, chipbreaker on one face (single-sided positive insert); 12 — diameter = 12 mm insert diameter; 04 — thickness = insert thickness 4.76 mm.

What is RCMT1204 used for?

RCMT1204 is a turning insert. The brand-equivalents table on this page lists each maker's grade and its ISO application window (the P, M, K and similar ranges). Match the geometry first, then choose the grade for your material and operation, and verify on a sample part.

What is the equivalent of RCMT1204 across brands?

RCMT1204 is a shared ISO 1832 geometry, so Sandvik, ISCAR, Kennametal, Tungaloy each offer it in their own grades and coatings. A cross-reference matches the geometry, not the process, so treat equivalents as starting points and verify on a sample part.

Is RCMT1204 a positive insert?

RCMT1204 has positive clearance, so it is a positive, single-sided insert: lower cutting forces, suited to finishing, small parts and low-rigidity setups.

Does this cross-reference favour specific brands?

No. Comparable grades appear here only because manufacturer-published comparison charts place them at the same ISO application position. No manufacturer pays for placement, nothing on this page is sponsored, and CuttingToolsAI sells no tools and earns no commission. Placements backed by a single chart are flagged as such, and every comparison ends the same way: verify on a sample part before switching.

Insert cross-reference · Round · 7° clearance · 12mm diameter · 4.76mm thick

RCMT1204 Cross Reference / ANSI RCMT 43

Equivalent RCMT1204 inserts across 4 brands — Sandvik, ISCAR, Kennametal, Tungaloy. In US (inch, ANSI B212.4) catalogs this same insert is listed as RCMT 43 — identical geometry, different designation system. Same ISO 1832 geometry class; grades, coatings and application windows differ by manufacturer. Treat equivalents as starting points and verify on a sample part: a cross-reference matches the geometry, not the process.

A general-purpose nose radius: a balance of edge strength and finish that suits most first-choice turning before you tune up for finishing or down for roughing.

Brand equivalents — RCMT1204

Brand	Designation / grade	Coating	Application
Sandvik	RCMT 12 04 M0-SM S205	CVD Al₂O₃	ISO S (HRSA)
ISCAR	RCMT 1204M0-14 IC806	PVD TiAlN (SUMO TEC®)	S15–S25
Kennametal	RCMT 120400 KCU10B	PVD AlTiN	universal · incl. S
Tungaloy	RCMT1204M0-RS AH8015	PVD AlTiN	ISO S (HRSA)

Grades used ISCAR IC806 · Kennametal KCU10B · Tungaloy AH8015

Catalog availability — who makes RCMT1204

15 brands list RCMT1204 in their published standard programs, with 339 catalog variants across chipbreakers, grades and coatings. Variant count shows how deep each maker's standard range goes for this geometry. It is not a quality ranking.

Brand	Catalog variants
Sandvik-Coromant	71
Walter	51
Widia	48
SECO Tools	41
Sumitomo	41
Kennametal	25
Ingersoll	21
Tungaloy	10
Iscar	7
Ceratizit	6
Mitsubishi Materials	6
ZCC Cutting Tools	6
WNT	3
Hahn+Kolb	2
Kyocera	1

Hahn+Kolb is a distributor private-label program (ATORN). Counts are catalog listings, not stock levels. Availability varies by region and distributor.

ISO designation decoded — what RCMT1204 means

R — shape: round
C — clearance angle: relief angle 7°
M — tolerance: class M — molded, medium tolerance on inscribed circle and corner point (typically ±0.05–0.13 mm depending on size)
T — type: fixing hole with countersink, chipbreaker on one face (single-sided positive insert)
12 — diameter: 12 mm insert diameter
04 — thickness: insert thickness 4.76 mm

Cross-reference a grade at its ISO position

Type any maker's grade (e.g. GC4325, AC820P, T9215) to see grades other brands publish at the same ISO application position. VERIFIED = multi-source consensus; 2+ CHARTS = placement independently confirmed by two or more manufacturer charts; SINGLE-SOURCE = one chart only. Comparable at ISO position — not identical performance. Verify on a sample part.

Ask the AI advisor about RCMT1204

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Related designations

SCMT09T308 SNMG120404 SNMG120408 SNMG120412 TCGT16T304 TCMT16T304 All designations →