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Description
DIAMETER DØ28.5 mm
THICKNESS b6.0 mm
MATERIALHSS
STANDARDDIN 850 A
T-slot cutter 28.5x6.0 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 | Ø28.5 mm |
| Cutting section width b | 6.0 mm |
| Shank diameter d | Ø12.0 mm |
| Shank length l | 40 mm |
| Overall length L | 63.0 mm |
| Number of cutting edges z | 6, straight teeth |
| Material | HSS |
| Key size | 6x11 per DIN 6888 |
T-slot cutter for metal 28.5x6.0 mm – construction and Ø12.0 mm shank
Tool construction and application limits
The 28.5x6.0 mm DIN 850 A T-slot cutter is a shank-type tool for Woodruff keyseats in shafts, listed in catalogs under the designation NFRh. The Ø28.5 mm disc, 6.0 mm thick, plunges radially into the shaft and produces an arcuate-bottom slot in a single pass, without longitudinal milling.
Cutting edges only on the disc – why the cutter cannot plunge axially
The disc's six straight cutting edges cut around the periphery and on the faces. The neck between the disc and shank has no cutting edges and carries the entire load, so plunging too quickly breaks it before the cutting edges chip. Plunge slowly and smoothly.
T-slot cutter or cutter for T-slots – what the standard says
Both names are used interchangeably in the trade, but the standards distinguish them. DIN 850 are cutters for Woodruff keyseats in shafts, while T-slots in milling machine tables per DIN 650 are cut with cutters DIN 851 of types NFRs and NFRg.
Applications of the 28.5x6.0 mm T-slot cutter – keyseats in shafts
Selecting the tool to match the key size
The slot produced by this cutter has a diameter of 28 mm and accepts a Woodruff key 6x11 per DIN 6888; the 0.5 mm difference between the tool and the slot falls within the standard's tolerance zone. Plunge the disc to 8.6 mm for series A or 9.5 mm for series B. The standard specifies this key size for shaft ends Ø30–38 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 Ø12.0 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 28.5x6.0 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 | 223–335 | 33–100 |
| P Quenched and tempered alloy steel | 15–25 | 0.025–0.050 | 168–279 | 25–84 |
| M Stainless steel 304 / 316 | 9–18 | 0.025–0.048 | 101–201 | 15–58 |
| K Gray cast iron | 18–30 | 0.025–0.060 | 201–335 | 30–121 |
| N Aluminum, brass | 25–50 | 0.025–0.065 | 279–558 | 42–218 |
Calculating spindle speed and feed for structural steel
Starting point: vc = 25 m/min. The formula n = 1000 × vc / (π × D) gives 279 rpm, and the feed rate at fz = 0.035 mm with 6 cutting edges is 59 mm/min. Full-width cutting traps chips in the slot – without abundant coolant, they pass back under the cutting edge and chip it.
T-slot cutter 28.5x6.0 mm – frequently asked questions
Selection, clamping and slot dimensions
Frequently asked questions
Woodruff key 6x11 per DIN 6888 – a segment with a diameter of 28 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 28.5 mm produces a slot within this tolerance zone – this is a standard dimension, not a wear allowance.
To 8.6 mm in series A or 9.5 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.
Yes, with reduced cutting parameters: vc 9–18 m/min and cooling with an emulsion containing an EP additive. Stainless steel work-hardens under the cutting edge, so maintain a constant feed without dwelling in the slot.
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| Courier GLS | Cash on delivery | 17,26 zł gross | Lead time 1 working day |
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