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Description
DIAMETER DØ20.5 mm
THICKNESS b5.0 mm
MATERIALHSS
STANDARDDIN 850 A
T-slot cutter 20.5x5.0 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 | Ø20.5 mm |
| Cutting section width b | 5.0 mm |
| Shank diameter d | Ø12.0 mm |
| Shank length l | 40 mm |
| Overall length L | 62.0 mm |
| Number of cutting edges z | 6, straight teeth |
| Material | HSS |
T-slot cutter for metal 20.5x5.0 mm – construction and Ø10.0 mm shank
Tool construction and application limits
T-slot cutter 20.5x5.0 mm DIN 850 A, listed in catalogs as NFRh, cuts narrow grooves and slots 5.0 mm wide. The Ø20.5 mm disc cuts across its full width and enters the material radially, without axial travel.
Cutting edges only on the disc – why the cutter cannot plunge axially
Six straight peripheral cutting edges and cutting faces produce a slot with clean walls. All torque passes through the neck, which has no cutting edges, so feed the disc into the material only radially and without jerking.
Slot length depends on plunge depth
The plunged disc leaves a slot with an arcuate bottom and a radius of 10.25 mm. Its length depends on depth: for t = 5 mm, the arc chord is l = 2√(t × (D − t)) ≈ 17.6 mm. The same cutter therefore produces slots of different lengths – controlled by plunge depth, not longitudinal feed.
Applications of the 20.5x5.0 mm T-slot cutter – grooves and slots
Tool application range
The 5.0 mm width and Ø20.5 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 20.5x5.0 mm
Conservative values by ISO 513 groups
| Workpiece material | vc [m/min] | fz [mm/tooth] | n [rpm] |
|---|---|---|---|
| P Structural steel up to 275 HB | 20–30 | 0.025–0.050 | 311–466 |
| P Quenched and tempered alloy steel | 15–25 | 0.025–0.050 | 233–388 |
| M Stainless steel 304 / 316 | 9–18 | 0.025–0.048 | 140–279 |
| K Gray cast iron | 18–30 | 0.025–0.060 | 279–466 |
| N Aluminum, brass | 25–50 | 0.025–0.065 | 388–776 |
Calculating spindle speed and feed for structural steel
For structural steel, use vc = 25 m/min – at a diameter of 20.5 mm, this gives 388 rpm. Calculate the feed rate from vf = fz × z × n: at fz = 0.035 mm and 6 cutting edges, the result is 81 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 20.5x5.0 mm – frequently asked questions
Applications, clamping and cutting data
Frequently asked questions
For grooves and slots 5.0 mm wide – grooves for retaining rings and seals, lubrication grooves, recesses for sheet metal, and cutting through thin walls.
collet ER-32 with an insert for Ø10.0 mm. The plain straight shank has no clamping flat, so a drill chuck is unsuitable.
No. The neck behind the disc has no cutting edges and breaks during axial entry. Feed the disc radially.
The length depends on plunge depth and disc diameter: l = 2√(t × (D − t)). At t = 5 mm and Ø20.5 mm, the result is approximately 17.6 mm.
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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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