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Description
DIAMETER DØ19.5 mm
THICKNESS b4.0 mm
MATERIALHSS
STANDARDDIN 850 A
T-slot cutter 19.5x4.0 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 | Ø19.5 mm |
| Cutting section width b | 4.0 mm |
| Shank diameter d | Ø12.0 mm |
| Shank length l | 42 mm |
| Overall length L | 56.0 mm |
| Number of cutting edges z | 6, straight teeth |
| Material | HSS |
| Key size | 4x7.5 per DIN 6888 |
T-slot cutter for metal 19.5x4.0 mm – construction and Ø12.0 mm shank
Tool construction and application limits
The 19.5x4.0 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 Ø19.5 mm disc, 4.0 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 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
Two standards, two applications: DIN 850 describes cutters for Woodruff keyseats per DIN 6888, DIN 851 cutters for T-slots per DIN 650. The common trade name covers both types, so the standard number determines which tool to order.
Applications of the 19.5x4.0 mm T-slot cutter – keyseats in shafts
Selecting the tool to match the key size
The tool matches a Woodruff key 4x7.5 per DIN 6888 – the slot diameter in the shaft is 19 mm, and the remaining 0.5 mm of cutter diameter accounts for the slot tolerance zone. Plunge depth: 6.0 mm in series A, 6.6 mm in series B. The standard specifies this key size for shaft ends Ø17–22 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 19.5x4.0 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 | 326–490 | 49–147 |
| P Quenched and tempered alloy steel | 15–25 | 0.025–0.050 | 245–408 | 37–122 |
| M Stainless steel 304 / 316 | 9–18 | 0.025–0.048 | 147–294 | 22–85 |
| K Gray cast iron | 18–30 | 0.025–0.060 | 294–490 | 44–176 |
| N Aluminum, brass | 25–50 | 0.025–0.065 | 408–816 | 61–318 |
Calculating spindle speed and feed for structural steel
Starting point: vc = 25 m/min. The formula n = 1000 × vc / (π × D) gives 408 rpm, and the feed rate at fz = 0.035 mm with 6 cutting edges is 86 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 19.5x4.0 mm – frequently asked questions
Selection, clamping and slot dimensions
Frequently asked questions
Woodruff key 4x7.5 per DIN 6888 – a segment with a diameter of 19 mm and a width of 4.0 mm.
To 6.0 mm in series A or 6.6 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.
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.
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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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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