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Description
DIAMETER DØ28.5 mm
THICKNESS b7.0 mm
MATERIALHSS
STANDARDDIN 850 A
T-slot cutter 28.5x7.0 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 | 7.0 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 |
T-slot cutter for metal 28.5x7.0 mm – construction and Ø12.0 mm shank
Tool construction and application limits
T-slot cutter 28.5x7.0 mm DIN 850 A, listed in catalogs as NFRh, cuts narrow grooves and slots 7.0 mm wide. The Ø28.5 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
The disc cuts with six straight cutting edges around its periphery and on its faces, so the slot width matches the 7.0 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 bottom is an arc with a radius of 14.25 mm, as the disc reproduces its own profile in the material. The arc distributes stress over a wider area than the corner of a rectangular slot machined with an end mill, improving the shaft's fatigue strength. The slot length is calculated from the chord: at a penetration depth of t = 5 mm, it is l = 2√(t × (D − t)) ≈ 21.7 mm.
Applications of the 28.5x7.0 mm T-slot cutter – grooves and slots
Tool application range
This disc size has no corresponding Woodruff key size under DIN 6888, so the tool is used for machining grooves and slots – retaining ring seats, lubrication and seal grooves, assembly recesses and slitting thin walls. The penetration depth is selected according to the required slot length rather than the tool diameter – with the full disc width engaged, each additional millimeter of penetration increases cutting resistance and neck loading.
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Application limitation
Clamping: collet ER-32 with an insert for Ø12.0 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 28.5x7.0 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
Use vc = 25 m/min. Spindle speed: n = 1000 × 25 / (π × 28.5) ≈ 279 rpm. Feed rate with 6 cutting edges and fz = 0.035 mm: vf = 279 × 0.035 × 6 ≈ 59 mm/min. The disc cuts across its full width in an enclosed channel, so supply plenty of coolant along the slot to flush out chips.
T-slot cutter 28.5x7.0 mm – frequently asked questions
Applications, clamping and cutting data
Frequently asked questions
For grooves and slots 7.0 mm wide – grooves for retaining rings and seals, lubrication grooves, recesses for sheet metal, and cutting through thin walls.
For vc = 25 m/min, the result is 279 rpm. With the disc cutting across its full width, start at the lower end of the range and adjust after the first slot.
No. T-slots per DIN 650 are cut with cutters DIN 851 of type NFRs, for example NFRs 18x8 DIN 851.
The length depends on plunge depth and disc diameter: l = 2√(t × (D − t)). At t = 5 mm and Ø28.5 mm, the result is approximately 21.7 mm.
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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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