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Description
Angle to the axis45 degrees
Diameter range4–15 mm
InsertTCMT 110204
Length100 mm
Indexable countersink 4x15 mm – 90° cone for M4–M6 heads
Technical data and dimensions – 16 mm Weldon shank
| Technical data | |
|---|---|
| Cutting edge angle to the axis | 45° (90° cone) |
| Minimum diameter D2 | 4 mm |
| Maximum diameter D1 | 15 mm |
| Max. cutting depth | 5.5 mm |
| Flute length l | 30 mm |
| Overall length L | 100 mm |
| Shank diameter d | 16 mm, Weldon |
| Number of inserts Z | 1 |
| Insert | TCMT 110204 |
| Insert screw | M2.5x7, Torx T08, 1.0 N·m |
| Manufacturer | Smoxh, Turkey (HF45 TC11 D4-15) |
Indexable countersink 4x15 mm Smoxh countersinks seats for M4–M6 flat head screws and chamfers hole edges. It cuts with one TCMT 110204 insert over diameters from 4 to 15 mm. The insert has three cutting edges. A dull edge is replaced by rotating the insert through 120°, without resharpening the tool.
The 45° angle is measured between the insert edge and the tool axis. As it rotates, the insert sweeps a 90° cone. This matches the head angle of a metric countersunk screw. For every millimeter of plunge depth, the diameter increases by 2 mm. The entire feed is carried by one cutting edge, so a lower feed per revolution is selected. The 16 mm shank has a Weldon flat for the holder screw, which locks the tool in the holder.
Applications – countersunk screw seat and slot chamfers
Operations with the 90° countersink
The same insert edges cut the screw head recess and the chamfer. The countersink also works as a 45° chamfer mill. Only the tool path and plunge depth change. The countersink machines holes and slots wider than 4 mm.
Countersunk screw seat
The insert sweeps out a 90° cone, matching the screw head specified in DIN 7991. The countersink plunges axially into the clearance hole to the calculated depth. It accommodates M4, M5 and M6 heads with diameters from 8 to 12 mm. The head sits flush with the workpiece surface or 0.1 mm below it.
Chamfer on both slot edges
The tool is guided along the center of a slot from 4 to 15 mm wide. The insert chamfers both upper edges in a single pass. Chamfer width is set by the plunge depth. This method is used to chamfer keyway and guideway edges.
Screw head recess – selection and depth
Which screws fit and how deep to plunge
The countersink cuts from 4 mm to 15 mm in diameter. A complete recess requires two conditions. The clearance hole must be larger than 4 mm. The screw head must be less than 15 mm in diameter.
Calculator: Z-axis plunge depth for recess diameter
With a 90° cone, each millimeter of downward travel adds 2 mm to the diameter. Plunge depth is measured from the workpiece surface to the insert corners at a diameter of 4 mm. Plunge depth = (recess diameter − 4 mm) ÷ 2, e.g., (10 − 4) ÷ 2 = 3 mm for an M5 head.
▲
Clearance hole wider than 4 mm
The countersink cuts from a diameter of 4 mm. In a clearance hole wider than 4 mm, e.g., 4.5 mm for M4, the recess is complete and the head seats fully.
TCMT 110204 insert – three edges and replacement
Triangular insert to ISO 1832, Torx T08 screw
The insert code is interpreted according to ISO 1832. T denotes a triangle, so the insert has three cutting edges. C denotes a 7° clearance angle: the insert is positive and cuts freely. M is the tolerance class, and the next T denotes a countersunk screw hole and a chip breaker on one side. 11 denotes an edge length of approximately 11 mm, 02 is the thickness code, and 04 denotes a corner radius of 0.4 mm.
The insert's 60° angle does not determine the chamfer angle. The 45° angle results from the insert's position in the body. The store offers the TCMT 110204 H6310 insert from the Korean brand Horn. Grade H6310 is a general-purpose grade for steel and stainless steel. We sell the countersink without inserts.
Changing edges step by step
1Loosening the screw
Key: Torx T08
2Indexing the insert
Rotation: 120°
3Cleaning the insert seat
Chips: removed
4Tightening the screw
Torque: 1.0 N·m
✓Test recess
Check: with the screw head
M2.5x7 screw and T08 key according to the Smoxh catalog
With one insert, each indexing operation provides a fresh edge across the entire 4–15 mm range. A chip under the insert shifts the cutting edge and changes the recess diameter, so the insert seat must be cleaned before installation.
Cutting data – starting values
Cutting speed and feed per tooth – conservative ranges
The values are based on conservative milling ranges with a 45° entering angle according to ISO 513. Start at the lower limit and increase the values while monitoring the chips and spindle sound.
| Workpiece material | Cutting speed vc [m/min] | Feed per tooth fz [mm] |
|---|---|---|
| P Structural and alloy steel | 150–220 | 0.10–0.22 |
| M Stainless steel | 80–140 | 0.08–0.18 |
| K Gray cast iron | 180–300 | 0.10–0.28 |
Calculating spindle speed and feed rate – M5 recess in steel
Spindle speed is calculated for the largest diameter engaged in the material, here the 10 mm head. Spindle speed = 1000 × cutting speed 150 m/min ÷ (3.14 × diameter 10 mm) ≈ 4770 rpm. Feed rate = feed per tooth 0.10 mm × 1 insert × 4770 rpm ≈ 470 mm/min. These two values are entered in the machine tool program.
Higher spindle speeds and lighter pressure work well for countersinking. Low speeds with heavy pressure cause vibration. When machining stainless steel, coolant protects the hole edge from overheating.
Indexable countersink 4x15 mm Smoxh countersinks 90° seats for M4, M5 and M6 heads. It also chamfers holes larger than 4 mm and slot edges. It cuts with one TCMT 110204 insert over diameters from 4 to 15 mm. The 16 mm Weldon shank and 100 mm length fit standard milling tool holders.
Questions about the 4x15 indexable countersink
Recess, inserts, depth, CNC program
For 90° flat head screws according to DIN 7991: M4, M5 and M6. Their head diameters are 8, 10 and 12 mm, and their clearance hole diameters are 4.5; 5.5 and 6.6 mm. The calculator above provides the plunge depth for each of these screws.
TCMT 1102 inserts according to ISO, e.g., TCMT 110204 with a 0.4 mm corner radius. The store offers the TCMT 110204 H6310 Horn insert for steel and stainless steel. The insert is secured with an M2.5x7 screw with a Torx T08 recess.
One TCMT 110204 insert. The insert has three edges, providing three edge changes.
Enter a 90° countersink with a tip diameter of 4 mm in the tool table. Measure the tool height to the insert corners. Plunge depth = (head diameter − 4 mm) ÷ 2, plus approx. 0.1 mm.
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All orders are delivered by courier company GLS. For orders exceeding 369 PLN gross shipping is FREE
| 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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