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Description
DIAMETER DØ28.5 mm
THICKNESS b5.0 mm
MATERIALHSS
STANDARDDIN 850 A
T-slot cutter 28.5x5.0 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 | Ø28.5 mm |
| Cutting section width b | 5.0 mm |
| Shank diameter d | Ø12.0 mm |
| Shank length l | 40 mm |
| Overall length L | 50.0 mm |
| Number of cutting edges z | 6, straight teeth |
| Material | HSS |
T-slot cutter for metal 28.5x5.0 mm – construction and Ø10.0 mm shank
Tool construction and application limits
The 28.5x5.0 mm T-slot cutter to DIN 850 A is a shank-type tool of type NFRh for grooves and slots 5.0 mm wide. The Ø28.5 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
The disc cuts with six straight cutting edges around its periphery and on its faces, so the slot width matches the 5.0 mm thickness. With no cutting edges on the neck, the tool cannot enter axially – attempting to plunge it like a drill breaks the neck.
Slot length depends on plunge depth
The slot has an arcuate bottom with a radius of 14.25 mm and a length determined by plunge depth. At t = 5 mm, the chord is l = 2√(t × (D − t)) ≈ 21.7 mm. The smooth bottom transition reduces stress concentration, which is why slots in parts subjected to variable loading are machined with a disc rather than an end mill.
Applications of the 28.5x5.0 mm T-slot cutter – grooves and slots
Tool application range
The combination of Ø28.5 mm and a thickness of 5.0 mm falls outside the DIN 6888 Woodruff key series, so the cutter serves as a tool for grooves and slots: retaining ring grooves, seal grooves, recesses for sheet metal, and cutting through thin sections. 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 28.5x5.0 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 | 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
Starting point: vc = 25 m/min. The formula n = 1000 × vc / (π × D) gives 279 rpm, and the feed rate at fz = 0.035 mm with 6 cutting edges is 59 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 28.5x5.0 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.
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.
No. The neck behind the disc has no cutting edges and breaks during axial entry. Feed the disc radially.
Yes, and it runs fastest in this material: vc 25–50 m/min. Aluminum adheres to the cutting edge, so apply plenty of coolant and do not stop the feed in the slot – a built-up edge compromises slot size.
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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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