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Description
DIAMETER DØ8 mm
THICKNESS b1.2 mm
MATERIALHSS
STANDARDDIN 850 A
T-slot cutter 8x1.2 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 | Ø8 mm |
| Cutting section width b | 1.2 mm |
| Shank diameter d | Ø9.0 mm |
| Shank length l | 50 mm |
| Overall length L | 50.0 mm |
| Number of cutting edges z | 6, straight teeth |
| Material | HSS |
T-slot cutter for metal 8x1.2 mm – construction and Ø9.0 mm shank
Tool construction and application limits
T-slot cutter 8x1.2 mm per DIN 850 A (type NFRh) cuts slots 1.2 mm wide in shafts and flat workpieces. The plunged Ø8 mm disc leaves a slot with an arcuate bottom and a radius of 4 mm.
Cutting edges only on the disc – why the cutter cannot plunge axially
The cutting edges cover the disc circumference and both faces, producing parallel walls in the 1.2 mm wide slot. The neck remains smooth and carries the load; its cross section, rather than the number of cutting edges, determines the feed limit.
Slot length depends on plunge depth
The slot bottom is an arc with a radius of 4 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 = 3 mm, it is l = 2√(t × (D − t)) ≈ 7.7 mm.
Applications of the 8x1.2 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 Ø9.0 mm. A drill chuck will not hold the tool with the disc fully engaged. The 1.2 mm thick disc is sensitive to lateral stress – set the feed at the lower end of the range and do not retract the tool under load. Uncoated HSS operates up to approximately 275 HB; above this, use the HSSE (HSS-Co5) version.
T-slot cutter cutting data – spindle speed and feed for 8x1.2 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 | 0.013–0.028 | 796–1194 | 62–201 |
| P Quenched and tempered alloy steel | 15–25 | 0.013–0.028 | 597–995 | 47–167 |
| M Stainless steel 304 / 316 | 9–18 | 0.013–0.033 | 358–716 | 28–142 |
| K Gray cast iron | 18–30 | 0.013–0.033 | 716–1194 | 56–236 |
| N Aluminum, brass | 25–50 | 0.013–0.035 | 995–1989 | 78–418 |
Calculating spindle speed and feed for structural steel
For structural steel, use vc = 25 m/min – at a diameter of 8 mm, this gives 995 rpm. Calculate the feed rate from vf = fz × z × n: at fz = 0.020 mm and 6 cutting edges, the result is 119 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 8x1.2 mm – frequently asked questions
Applications, clamping and cutting data
Frequently asked questions
For grooves and slots 1.2 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 Ø9.0 mm. The plain straight shank has no clamping flat, so a drill chuck is unsuitable.
Apply plenty of emulsion along the slot to flush chips out. If pressurized coolant is unavailable, use short passes and retract the tool to remove chips.
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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