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Description
DIAMETER DØ32.5 mm
THICKNESS b8.0 mm
MATERIALHSS
STANDARDDIN 850 A
T-slot cutter 32.5x8.0 mm DIN 850 A HSS – dimensions and technical data
Tool specifications and key size
| TECHNICAL DATA | |
|---|---|
| Tool type | NFRh shank-type milling cutter |
| Standard | DIN 850 A |
| Cutting diameter D | Ø32.5 mm |
| Cutting section width b | 8.0 mm |
| Shank diameter d | Ø12.0 mm |
| Shank length l | 45 mm |
| Overall length L | 71.0 mm |
| Number of cutting edges z | 6, straight teeth |
| Material | HSS |
| Key size | 8x13 per DIN 6888 |
T-slot cutter for metal 32.5x8.0 mm – construction and Ø12.0 mm shank
Tool construction and application limits
The 32.5x8.0 mm T-slot cutter per DIN 850 A produces a Woodruff keyseat in a single plunge, without longitudinal feed. Its catalog designation is NFRh. The disc thickness of 8.0 mm determines the slot width, while its Ø32.5 mm diameter determines the slot radius and length.
Cutting edges only on the disc – why the cutter cannot plunge axially
The disc's six straight cutting edges cut around the periphery and on the faces. The neck between the disc and shank has no cutting edges and carries the entire load, so plunging too quickly breaks it before the cutting edges chip. Plunge slowly and smoothly.
T-slot cutter or cutter for T-slots – what the standard says
Two standards, two applications: DIN 850 describes cutters for Woodruff keyseats per DIN 6888, DIN 851 cutters for T-slots per DIN 650. The common trade name covers both types, so the standard number determines which tool to order.
Applications of the 32.5x8.0 mm T-slot cutter – keyseats in shafts
Selecting the tool to match the key size
The tool matches a Woodruff key 8x13 per DIN 6888 – the slot diameter in the shaft is 32 mm, and the remaining 0.5 mm of cutter diameter accounts for the slot tolerance zone. Plunge depth: 10.2 mm in series A, 11.5 mm in series B. The standard specifies this key size for shaft ends Øover 38 mm, where torque is transmitted by another element – a taper or shrink fit – and the key locates the angular position.
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Application limitation
Clamping: collet ER-32 with an insert for Ø12.0 mm. The plain straight shank has no clamping flat – with the disc fully engaged, a drill chuck can release the tool and ruin the slot. 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 32.5x8.0 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 | 196–294 | 29–88 |
| P Quenched and tempered alloy steel | 15–25 | 0.025–0.050 | 147–245 | 22–74 |
| M Stainless steel 304 / 316 | 9–18 | 0.025–0.048 | 88–176 | 13–51 |
| K Gray cast iron | 18–30 | 0.025–0.060 | 176–294 | 26–106 |
| N Aluminum, brass | 25–50 | 0.025–0.065 | 245–490 | 37–191 |
Calculating spindle speed and feed for structural steel
For structural steel, use vc = 25 m/min – at a diameter of 32.5 mm, this gives 245 rpm. Calculate the feed rate from vf = fz × z × n: at fz = 0.035 mm and 6 cutting edges, the result is 51 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 32.5x8.0 mm – frequently asked questions
Selection, clamping and slot dimensions
Frequently asked questions
Woodruff key 8x13 per DIN 6888 – a segment with a diameter of 32 mm and a width of 8.0 mm.
To 10.2 mm in series A or 11.5 mm in series B per DIN 6888. Select the series together with the keyway depth in the hub – values from the two series must not be mixed.
No. The neck behind the disc has no cutting edges and does not cut – axial entry breaks it. Feed the disc radially into the material, slowly and with coolant.
Yes, with reduced cutting parameters: vc 9–18 m/min and cooling with an emulsion containing an EP additive. Stainless steel work-hardens under the cutting edge, so maintain a constant feed without dwelling in the slot.
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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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