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Description
DIAMETER DØ22.5 mm
THICKNESS b4.0 mm
MATERIALHSS
STANDARDDIN 850 A
T-slot cutter 22.5x4.0 mm DIN 850 A HSS – dimensions and technical data
Tool specifications
| TECHNICAL DATA | |
|---|---|
| Tool type | NFRh shank-type milling cutter |
| Standard | DIN 850 A |
| Cutting diameter D | Ø22.5 mm |
| Cutting section width b | 4.0 mm |
| Shank diameter d | Ø10.0 mm |
| Shank length l | 42 mm |
| Overall length L | 62.0 mm |
| Number of cutting edges z | 6, straight teeth |
| Material | HSS |
T-slot cutter for metal 22.5x4.0 mm – construction and Ø10.0 mm shank
Tool construction and application limits
T-slot cutter 22.5x4.0 mm DIN 850 A, listed in catalogs as NFRh, cuts narrow grooves and slots 4.0 mm wide. The Ø22.5 mm disc cuts across its full width and enters the material radially, without axial travel.
Cutting edges only on the disc – why the cutter cannot plunge axially
Six straight cutting edges cut around the disc periphery and on both faces, producing parallel slot sides. The neck behind the disc has no cutting edges and transmits all the torque – it limits the feed, not the cutting edges.
Slot length depends on plunge depth
The slot has an arcuate bottom with a radius of 11.25 mm and a length determined by plunge depth. At t = 5 mm, the chord is l = 2√(t × (D − t)) ≈ 18.7 mm. The smooth bottom transition reduces stress concentration, which is why slots in parts subjected to variable loading are machined with a disc rather than an end mill.
Applications of the 22.5x4.0 mm T-slot cutter – grooves and slots
Tool application range
The combination of Ø22.5 mm and a thickness of 4.0 mm falls outside the DIN 6888 Woodruff key series, so the cutter serves as a tool for grooves and slots: retaining ring grooves, seal grooves, recesses for sheet metal, and cutting through thin sections. Select the plunge depth to suit the required slot length, not the tool diameter – with the full disc width engaged, each additional millimeter of penetration increases cutting forces and neck loading.
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Application limitation
Clamping: collet ER-32 with an insert for Ø10.0 mm. A drill chuck will not hold the tool with the disc fully engaged. Uncoated HSS works up to approximately 275 HB; above this, use the HSSE (HSS-Co5) version.
T-slot cutter cutting data – spindle speed and feed for 22.5x4.0 mm
Conservative values by ISO 513 groups
| Workpiece material | vc [m/min] | fz [mm/tooth] | n [rpm] | vf [mm/min] |
|---|---|---|---|---|
| P Structural steel up to 275 HB | 20–30 | 0.025–0.050 | 283–424 | 42–127 |
| P Quenched and tempered alloy steel | 15–25 | 0.025–0.050 | 212–354 | 32–106 |
| M Stainless steel 304 / 316 | 9–18 | 0.025–0.048 | 127–255 | 19–73 |
| K Gray cast iron | 18–30 | 0.025–0.060 | 255–424 | 38–153 |
| N Aluminum, brass | 25–50 | 0.025–0.065 | 354–707 | 53–276 |
Calculating spindle speed and feed for structural steel
For structural steel, use vc = 25 m/min – at a diameter of 22.5 mm, this gives 354 rpm. Calculate the feed rate from vf = fz × z × n: at fz = 0.035 mm and 6 cutting edges, the result is 74 mm/min. Chips exit through the same slot that supplies coolant, so direct the emulsion along the slot and maintain a generous flow.
T-slot cutter 22.5x4.0 mm – frequently asked questions
Applications, clamping and cutting data
Frequently asked questions
For grooves and slots 4.0 mm wide – grooves for retaining rings and seals, lubrication grooves, recesses for sheet metal, and cutting through thin walls.
collet ER-32 with an insert for Ø10.0 mm. The plain straight shank has no clamping flat, so a drill chuck is unsuitable.
No. The neck behind the disc has no cutting edges and breaks during axial entry. Feed the disc radially.
The length depends on plunge depth and disc diameter: l = 2√(t × (D − t)). At t = 5 mm and Ø22.5 mm, the result is approximately 18.7 mm.
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| 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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