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Description
DIAMETER DØ19.5 mm
THICKNESS b5.0 mm
MATERIALHSS
STANDARDDIN 850 A
T-slot cutter 19.5x5.0 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 | Ø19.5 mm |
| Cutting section width b | 5.0 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 | 5x7.5 per DIN 6888 |
T-slot cutter for metal 19.5x5.0 mm – construction and Ø12.0 mm shank
Tool construction and application limits
The 19.5x5.0 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 Ø19.5 mm disc, 5.0 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 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
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 19.5x5.0 mm T-slot cutter – keyseats in shafts
Selecting the tool to match the key size
This disc size matches a key 5x7.5 per DIN 6888: the slot diameter in the shaft is 19 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 5.5 mm (series A) or 6.4 mm (series B). The standard assigns this key to shaft ends Ø12–17 mm, when it transmits torque, and Ø22–30 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 19.5x5.0 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 | 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
For structural steel, use vc = 25 m/min – at a diameter of 19.5 mm, this gives 408 rpm. Calculate the feed rate from vf = fz × z × n: at fz = 0.035 mm and 6 cutting edges, the result is 86 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 19.5x5.0 mm – frequently asked questions
Selection, clamping and slot dimensions
Frequently asked questions
Woodruff key 5x7.5 per DIN 6888 – a segment with a diameter of 19 mm and a width of 5.0 mm.
collet ER-32 with an insert for Ø12.0 mm. A drill chuck will not hold the tool with the disc fully engaged.
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.
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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| Courier GLS | Cash on delivery | 17,26 zł gross | Lead time 1 working day |
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