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Description
DIAMETER DØ22.5 mm
THICKNESS b5.0 mm
MATERIALHSS
STANDARDDIN 850 A
T-slot cutter 22.5x5.0 mm DIN 850 A HSS – dimensions and technical data
Tool specifications and key size
| TECHNICAL DATA | |
|---|---|
| Tool type | NFRh shank-type milling cutter |
| Standard | DIN 850 A |
| Cutting diameter D | Ø22.5 mm |
| Cutting section width b | 5.0 mm |
| Shank diameter d | Ø10.0 mm |
| Shank length l | 40 mm |
| Overall length L | 63.0 mm |
| Number of cutting edges z | 6, straight teeth |
| Material | HSS |
| Key size | 5x9 per DIN 6888 |
T-slot cutter for metal 22.5x5.0 mm – construction and Ø10.0 mm shank
Tool construction and application limits
T-slot cutter 22.5x5.0 mm DIN 850 A, type NFRh, is used for Woodruff keyseats in shaft ends. The Ø22.5 mm disc, 5.0 mm thick, plunges radially and reproduces an arcuate slot bottom with a radius of 11.25 mm in the shaft.
Cutting edges only on the disc – why the cutter cannot plunge axially
The disc has six straight cutting edges around its periphery and also cuts on both faces. Behind it is a neck without cutting edges that transmits all the torque – this is the weakest part of the tool, and it, rather than the cutting edges, limits the permissible feed.
T-slot cutter or cutter for T-slots – what the standard says
The trade name confuses two different tools. This cutter works in the shaft and produces a keyseat per DIN 6888. A T-slot in a machine tool table, per DIN 650, requires a cutter DIN 851 with different disc geometry and a thicker neck.
Applications of the 22.5x5.0 mm T-slot cutter – keyseats in shafts
Selecting the tool to match the key size
This disc size matches a key 5x9 per DIN 6888: the slot diameter in the shaft is 22 mm, and the cutter is 0.5 mm larger because the standard specifies a +0.5 mm deviation for the slot. The disc plunge depth is 7.0 mm (series A) or 7.9 mm (series B). The standard specifies this key size for shaft ends Ø22–30 mm, where torque is transmitted by another element – a taper or shrink fit – and the key locates the angular position.
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Application limitation
Clamping: collet ER-32 with an insert for Ø10.0 mm. The plain straight shank has no clamping flat – with the disc fully engaged, a drill chuck can release the tool and ruin the slot. 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 22.5x5.0 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 22.5x5.0 mm – frequently asked questions
Selection, clamping and slot dimensions
Frequently asked questions
Woodruff key 5x9 per DIN 6888 – a segment with a diameter of 22 mm and a width of 5.0 mm.
DIN 6888 specifies the diameter of the arcuate keyseat in the shaft with a deviation of +0.5 mm. A cutter with a diameter of 22.5 mm produces a slot within this tolerance zone – this is a standard dimension, not a wear allowance.
No. The neck behind the disc has no cutting edges and does not cut – axial entry breaks it. Feed the disc radially into the material, slowly and with coolant.
HSSE contains cobalt, which increases heat resistance. In practice, this allows operation at the upper end of the speed range and provides longer tool life in quenched and tempered steels; in ordinary structural steel, the difference is small.
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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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