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Description
DIAMETER DØ16.5 mm
THICKNESS b4.0 mm
MATERIALHSS
STANDARDDIN 850 A
T-slot cutter 16.5x4.0 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 | Ø16.5 mm |
| Cutting section width b | 4.0 mm |
| Shank diameter d | Ø10.0 mm |
| Shank length l | 40 mm |
| Overall length L | 56.0 mm |
| Number of cutting edges z | 6, straight teeth |
| Material | HSS |
| Key size | 4x6.5 per DIN 6888 |
T-slot cutter for metal 16.5x4.0 mm – construction and Ø10.0 mm shank
Tool construction and application limits
The 16.5x4.0 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 4.0 mm determines the slot width, while its Ø16.5 mm diameter determines the slot radius and length.
Cutting edges only on the disc – why the cutter cannot plunge axially
Six straight cutting edges work around the disc periphery and on both faces. The neck behind the disc has no cutting edges yet transmits all the cutting torque – the cutter must therefore be plunged radially only; axial entry, as with a drill, breaks the neck.
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 16.5x4.0 mm T-slot cutter – keyseats in shafts
Selecting the tool to match the key size
The slot produced by this cutter has a diameter of 16 mm and accepts a Woodruff key 4x6.5 per DIN 6888; the 0.5 mm difference between the tool and the slot falls within the standard's tolerance zone. Plunge the disc to 5.0 mm for series A or 5.6 mm for series B. The standard assigns this key to shaft ends Ø10–12 mm, when it transmits torque, and Ø17–22 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 16.5x4.0 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 | 0.023–0.038 | 386–579 | 53–132 |
| P Quenched and tempered alloy steel | 15–25 | 0.023–0.038 | 289–482 | 40–110 |
| M Stainless steel 304 / 316 | 9–18 | 0.023–0.043 | 174–347 | 24–90 |
| K Gray cast iron | 18–30 | 0.023–0.043 | 347–579 | 48–149 |
| N Aluminum, brass | 25–50 | 0.023–0.048 | 482–965 | 67–278 |
Calculating spindle speed and feed for structural steel
For structural steel, use vc = 25 m/min – at a diameter of 16.5 mm, this gives 482 rpm. Calculate the feed rate from vf = fz × z × n: at fz = 0.030 mm and 6 cutting edges, the result is 87 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 16.5x4.0 mm – frequently asked questions
Selection, clamping and slot dimensions
Frequently asked questions
Woodruff key 4x6.5 per DIN 6888 – a segment with a diameter of 16 mm and a width of 4.0 mm.
collet ER-32 with an insert for Ø10.0 mm. A drill chuck will not hold the tool with the disc fully engaged.
To 5.0 mm in series A or 5.6 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.
Six. The number of cutting edges directly enters the feed rate calculation: vf = fz × z × n. At the same spindle speed, a tool with 6 cutting edges runs at a lower feed rate than one with 10 cutting edges, but each edge takes a thicker chip.
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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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