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Description
DIAMETER DØ32.5 mm
THICKNESS b10.0 mm
MATERIALHSS
STANDARDDIN 850 A
T-slot cutter 32.5x10.0 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 | 10.0 mm |
| Shank diameter d | Ø10.0 mm |
| Shank length l | 55 mm |
| Overall length L | 65.0 mm |
| Number of cutting edges z | 6, straight teeth |
| Material | HSS |
| Key size | 10x13 per DIN 6888 |
T-slot cutter for metal 32.5x10.0 mm – construction and Ø10.0 mm shank
Tool construction and application limits
The 32.5x10.0 mm DIN 850 A T-slot cutter is a shank-type tool for Woodruff keyseats in shafts, listed in catalogs under the designation NFRh. The Ø32.5 mm disc, 10.0 mm thick, plunges radially into the shaft and produces an arcuate-bottom slot in a single pass, without longitudinal milling.
Cutting edges only on the disc – why the cutter cannot plunge axially
The cutting edges are arranged around the disc periphery and on both faces – this produces parallel slot walls and a width matching the 10.0 mm thickness. The neck behind the disc remains smooth: it does not cut, but only transmits torque, so the tool cannot enter the material axially.
T-slot cutter or cutter for T-slots – what the standard says
The trade name confuses two different tools. This cutter works in the shaft and produces a keyseat per DIN 6888. A T-slot in a machine tool table, per DIN 650, requires a cutter DIN 851 with different disc geometry and a thicker neck.
Applications of the 32.5x10.0 mm T-slot cutter – keyseats in shafts
Selecting the tool to match the key size
This disc size matches a key 10x13 per DIN 6888: the slot diameter in the shaft is 32 mm, and the cutter is 0.5 mm larger because the standard specifies a +0.5 mm deviation for the slot. The disc plunge depth is 9.8 mm (series A) or 11.1 mm (series B). The standard assigns this key to shaft ends Ø30–38 mm, when it transmits torque, and Øover 38 mm, when torque is transmitted through another connection and the key only locates the angular position.
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Application limitation
Clamping: collet ER-32 with an insert for Ø10.0 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 32.5x10.0 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
Use vc = 25 m/min. Spindle speed: n = 1000 × 25 / (π × 32.5) ≈ 245 rpm. Feed rate with 6 cutting edges and fz = 0.035 mm: vf = 245 × 0.035 × 6 ≈ 51 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 32.5x10.0 mm – frequently asked questions
Selection, clamping and slot dimensions
Frequently asked questions
Woodruff key 10x13 per DIN 6888 – a segment with a diameter of 32 mm and a width of 10.0 mm.
DIN 6888 specifies the diameter of the arcuate keyseat in the shaft with a deviation of +0.5 mm. A cutter with a diameter of 32.5 mm produces a slot within this tolerance zone – this is a standard dimension, not a wear allowance.
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.
HSSE contains cobalt, which increases heat resistance. In practice, this allows operation at the upper end of the speed range and provides longer tool life in quenched and tempered steels; in ordinary structural steel, the difference is small.
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| Courier GLS | Cash on delivery | 17,26 zł gross | Lead time 1 working day |
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