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Description
DIAMETER DØ22.5 mm
THICKNESS b6.0 mm
MATERIALHSS
STANDARDDIN 850 A
T-slot cutter 22.5x6.0 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 | 6.0 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 | 6x9 per DIN 6888 |
T-slot cutter for metal 22.5x6.0 mm – construction and Ø10.0 mm shank
Tool construction and application limits
The 22.5x6.0 mm T-slot cutter per DIN 850 A produces a Woodruff keyseat in a single plunge, without longitudinal feed. Its catalog designation is NFRh. The disc thickness of 6.0 mm determines the slot width, while its Ø22.5 mm diameter determines the slot radius and length.
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
When purchasing, check the standard number, not the name. DIN 850 covers cutters for Woodruff keyseats, DIN 851 cutters for T-slots in milling machine tables. Interchanging these tools results in a broken neck or an incorrect slot profile.
Applications of the 22.5x6.0 mm T-slot cutter – keyseats in shafts
Selecting the tool to match the key size
The Ø22.5 mm cutter cuts a slot with a diameter of 22 mm for a Woodruff key 6x9 per DIN 6888. The extra 0.5 mm is the slot tolerance zone specified by the standard. The keyseat depth in the shaft is 6.6 mm in series A and 7.5 mm in series B. The standard assigns this key to shaft ends Ø17–22 mm, when it transmits torque, and Ø30–38 mm, when torque is transmitted through another connection and the key only 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 22.5x6.0 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
Use vc = 25 m/min. Spindle speed: n = 1000 × 25 / (π × 22.5) ≈ 354 rpm. Feed rate with 6 cutting edges and fz = 0.035 mm: vf = 354 × 0.035 × 6 ≈ 74 mm/min. The disc cuts across its full width in an enclosed channel, so supply plenty of coolant along the slot to flush out chips.
T-slot cutter 22.5x6.0 mm – frequently asked questions
Selection, clamping and slot dimensions
Frequently asked questions
Woodruff key 6x9 per DIN 6888 – a segment with a diameter of 22 mm and a width of 6.0 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.
collet ER-32 with an insert for Ø10.0 mm. A drill chuck will not hold the tool with the disc fully engaged.
To 6.6 mm in series A or 7.5 mm in series B per DIN 6888. Select the series together with the keyway depth in the hub – values from the two series must not be mixed.
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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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