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Description
DIAMETER DØ28.5 mm
THICKNESS b8.0 mm
MATERIALHSS
STANDARDDIN 850 A
T-slot cutter 28.5x8.0 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 | 8.0 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 | 8x11 per DIN 6888 |
T-slot cutter for metal 28.5x8.0 mm – construction and Ø12.0 mm shank
Tool construction and application limits
The 28.5x8.0 mm T-slot cutter per DIN 850 A cuts a Woodruff keyseat with a single plunge of the disc. It is listed in catalogs as NFRh; the Ø28.5 mm disc, 8.0 mm thick, enters the shaft radially, forming the slot without travel along the axis or tool overtravel.
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
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 28.5x8.0 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 8x11 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 8.2 mm for series A or 9.5 mm for series B. The standard assigns this key to shaft ends Ø22–30 mm, when it transmits torque, and Øover 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 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 28.5x8.0 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
Use vc = 25 m/min. Spindle speed: n = 1000 × 25 / (π × 28.5) ≈ 279 rpm. Feed rate with 6 cutting edges and fz = 0.035 mm: vf = 279 × 0.035 × 6 ≈ 59 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 28.5x8.0 mm – frequently asked questions
Selection, clamping and slot dimensions
Frequently asked questions
Woodruff key 8x11 per DIN 6888 – a segment with a diameter of 28 mm and a width of 8.0 mm.
collet ER-32 with an insert for Ø12.0 mm. A drill chuck will not hold the tool with the disc fully engaged.
To 8.2 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.
Six. The number of cutting edges directly enters the feed rate calculation: vf = fz × z × n. At the same spindle speed, a tool with 6 cutting edges runs at a lower feed rate than one with 10 cutting edges, but each edge takes a thicker chip.
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Shipping
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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