TaeguTec OFMT 05T3 TN-ML TT6080 Octagonal Carbide Milling Insert 8 Edges IC 12.7 mm PVD Coated for Cast Iron CNC TOOLS

The OFMT 05T3 TN-ML is an octagonal, screw-clamped milling insert from TaeguTec's OFMT 05 line. Its defining feature is the number of usable corners: eight cutting edges on a single insert, which is unusually high for a milling insert of this size and is the main economic argument for the line.

The insert measures 12.7 mm inscribed circle, 3.8 mm thick, with a 0.6 mm corner radius. Maximum depth of cut is 3.5 mm, with a recommended working range of 1.0 mm to 3.0 mm, and a feed range of 0.06 to 0.12 mm per tooth.

ML is the super-positive geometry in the OFMT 05 family. The family is described by TaeguTec as octagonal super-positive screw-type inserts for low cutting force machining — the design intent is to keep cutting forces down so that lighter machines and less rigid setups can still take a productive cut.

Grade TT6080 is a PVD-coated grade (AlTiN + TiN) on a fine-grain substrate, with an ISO range of K05–K25 and H05–H25. TaeguTec specifies it for grey and ductile cast iron and for medium machining of hardened steels.

TaeguTec describes the OFMT 05-ML family as inserts for stainless steel and low cutting force work. The TT6080 grade, however, is positioned for cast iron and hardened steel — not for stainless.

That means this specific combination is best read as a low-force geometry applied to cast iron and hardened steel work, where machine power or part rigidity is the constraint. If the job is stainless steel, the same insert designation is normally supplied in a different grade; if the job is cast iron on a light machine, this is exactly the right pairing.

Buyers specifying by insert designation alone should confirm the grade against the material before ordering.

• 8 cutting edges — eight corners on one octagonal insert; the lowest tool cost per edge in this size class.
• Super-positive ML geometry — low cutting force, suited to lighter machines and weaker setups.
• IC 12.7 mm, 3.8 mm thick, R0.6 — compact insert for face and shoulder milling with a 45° lead cutter.
• ap 1.0 – 3.0 mm working range, APMX 3.5 mm — moderate depth of cut per pass.
• fz 0.06 – 0.12 mm/tooth — fine to medium feed per tooth.
• TT6080 PVD grade, AlTiN + TiN — for grey and ductile cast iron and medium machining of hardened steel.
• Screw clamping — secure seating, quick indexing.

OFMT 05 T3 TN -ML TT6080

TaeguTec does not publish a public letter-by-letter glossary for every element of this designation; the values above are read from the published item data (IC, S, S1, geometry and grade), not from an assumed naming convention.

ML is a super-positive geometry. The rake is aggressive and the edge is sharp, which reduces the force needed to shear the chip.

Choose ML when:

• the machine is small, old or underpowered for the cutter diameter;
• the workpiece or fixture is not rigid, and cutting force shows up as chatter;
• the operation is light to medium face milling rather than heavy stock removal;
• the material is cast iron or hardened steel within the grade's ISO range.

Do not choose ML when:

• the operation is heavy roughing with impact — a stronger edge preparation is required;
• the depth of cut exceeds 3.5 mm;
• the material is stainless, aluminium or superalloy — different grades apply;
• the requirement is mirror surface finish — a wiper insert is the correct tool.

TT6080 is a PVD grade with an AlTiN + TiN coating on a fine-grain substrate, supplied in the yellow colour code.

What this means in practice: the grade is built for abrasive, low-ductility work — cast iron wears a coating quickly, and hardened steel generates heat at the edge. TT6080's combination is aimed at those two, not at gummy stainless steels.

The identical OFMT 05T3 TN-ML insert is catalogued in several grades. They look the same and share the same geometry, but they are different items:

Do not substitute one grade for another without confirming the workpiece material. This is the single most common source of wrong shipments on this insert.

• Fits TaeguTec OFMT 05 cutters — 45° entering angle, offered as end mills and face mills in the D32–50 mm range.
• Maximum depth of cut is set by the cutter body; the insert's own APMX is 3.5 mm.
• Confirm cutter code, lead angle, number of teeth and hand before ordering inserts.
• Screw clamping: check that the correct screw and wrench are available for the cutter body.

These figures come from TaeguTec's published item data for this insert. Cutting speed is not stated because it depends on the workpiece hardness, cutter diameter, stability and coolant; confirm vc against the cutter's recommendation and treat the first part as a trial cut.

• Order by full designation: OFMT 05T3 TN-ML TT6080 (TaeguTec catalog no. 5613629)
• Packing: 10 pieces.
• Always state the grade — the same designation exists in six grades plus an uncoated K10 option.

How many cutting edges? Eight. It is an octagonal insert with eight usable corners.

What material is this grade for? TT6080 is specified for grey and ductile cast iron and for medium machining of hardened steel (ISO K05–K25, H05–H25).

The family says stainless steel — is that right for this item? The OFMT 05-ML family is described as being for stainless steel and low cutting force work, but the TT6080 grade is a cast iron / hardened steel grade. For stainless, order the same insert designation in a stainless-suitable grade.

What depth of cut can it take? Working range 1.0–3.0 mm; APMX 3.5 mm. The cutter body also limits depth.

Can it be used on any face mill? No. It fits TaeguTec OFMT 05 cutters with 45° entering angle, D32–50 mm.

How is it packed? 10 pieces per pack.