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Description
DIAMETER DØ25.5 mm
THICKNESS b5.0 mm
MATERIALHSS
STANDARDDIN 850 A
T-slot cutter 25.5x5.0 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 | Ø25.5 mm |
| Cutting section width b | 5.0 mm |
| Shank diameter d | Ø10.0 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 25.5x5.0 mm – construction and Ø10.0 mm shank
Tool construction and application limits
T-slot cutter 25.5x5.0 mm per DIN 850 A (type NFRh) cuts slots 5.0 mm wide in shafts and flat workpieces. The plunged Ø25.5 mm disc leaves a slot with an arcuate bottom and a radius of 12.75 mm.
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 slot bottom is an arc with a radius of 12.75 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)) ≈ 20.2 mm.
Applications of the 25.5x5.0 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 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 25.5x5.0 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 | 250–374 | 38–112 |
| P Quenched and tempered alloy steel | 15–25 | 0.025–0.050 | 187–312 | 28–94 |
| M Stainless steel 304 / 316 | 9–18 | 0.025–0.048 | 112–225 | 17–65 |
| K Gray cast iron | 18–30 | 0.025–0.060 | 225–374 | 34–135 |
| N Aluminum, brass | 25–50 | 0.025–0.065 | 312–624 | 47–243 |
Calculating spindle speed and feed for structural steel
Use vc = 25 m/min. Spindle speed: n = 1000 × 25 / (π × 25.5) ≈ 312 rpm. Feed rate with 6 cutting edges and fz = 0.035 mm: vf = 312 × 0.035 × 6 ≈ 66 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 25.5x5.0 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.
For vc = 25 m/min, the result is 312 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.
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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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