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Description
DIAMETER DØ19.5 mm
THICKNESS b3.0 mm
MATERIALHSS
STANDARDDIN 850 A
T-slot cutter 19.5x3.0 mm DIN 850 A HSS – dimensions and technical data
Tool specifications
| TECHNICAL DATA | |
|---|---|
| Tool type | NFRh shank-type milling cutter |
| Standard | DIN 850 A |
| Cutting diameter D | Ø19.5 mm |
| Cutting section width b | 3.0 mm |
| Shank diameter d | Ø10.0 mm |
| Shank length l | 40 mm |
| Overall length L | 56.0 mm |
| Number of cutting edges z | 6, straight teeth |
| Material | HSS |
T-slot cutter for metal 19.5x3.0 mm – construction and Ø10.0 mm shank
Tool construction and application limits
The 19.5x3.0 mm T-slot cutter to DIN 850 A is a shank-type tool of type NFRh for grooves and slots 3.0 mm wide. The Ø19.5 mm disc enters the material radially and machines a slot with an arcuate bottom in a single pass.
Cutting edges only on the disc – why the cutter cannot plunge axially
Six straight cutting edges cut around the disc periphery and on both faces, producing parallel slot sides. The neck behind the disc has no cutting edges and transmits all the torque – it limits the feed, not the cutting edges.
Slot length depends on plunge depth
The plunged disc leaves a slot with an arcuate bottom and a radius of 9.75 mm. Its length depends on depth: for t = 3 mm, the arc chord is l = 2√(t × (D − t)) ≈ 14.1 mm. The same cutter therefore produces slots of different lengths – controlled by plunge depth, not longitudinal feed.
Applications of the 19.5x3.0 mm T-slot cutter – grooves and slots
Tool application range
The 3.0 mm width and Ø19.5 mm diameter do not match a Woodruff key size in DIN 6888 – this is a tool for grooves and slots: grooves for retaining rings and seals, lubrication grooves, slots for sheet metal and pins, and cutting through thin walls. Select the plunge depth to suit the required slot length, not the tool diameter – with the full disc width engaged, each additional millimeter of penetration increases cutting forces and neck loading.
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Application limitation
Clamping: collet ER-32 with an insert for Ø10.0 mm. A drill chuck will not hold the tool with the disc fully engaged. 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 19.5x3.0 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 19.5x3.0 mm – frequently asked questions
Applications, clamping and cutting data
Frequently asked questions
For grooves and slots 3.0 mm wide – grooves for retaining rings and seals, lubrication grooves, recesses for sheet metal, and cutting through thin walls.
This combination of diameter and thickness does not match any key size in DIN 6888. For keys, select a cutter with a diameter 0.5 mm larger than the slot diameter and a thickness equal to the key width.
collet ER-32 with an insert for Ø10.0 mm. The plain straight shank has no clamping flat, so a drill chuck is unsuitable.
For vc = 25 m/min, the result is 408 rpm. With the disc cutting across its full width, start at the lower end of the range and adjust after the first slot.
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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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