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Description
DIAMETER DØ38.5 mm
THICKNESS b8.0 mm
MATERIALHSS
STANDARDDIN 850 A
T-slot cutter 38.5x8.0 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 | Ø38.5 mm |
| Cutting section width b | 8.0 mm |
| Shank diameter d | Ø12.0 mm |
| Overall length L | 71.0 mm |
| Number of cutting edges z | 6, straight teeth |
| Material | HSS |
T-slot cutter for metal 38.5x8.0 mm – construction and Ø12.0 mm shank
Tool construction and application limits
The 38.5x8.0 mm DIN 850 A T-slot cutter is used for narrow grooves and slots. The tool of type NFRh has a Ø38.5 mm disc, 8.0 mm thick, mounted on a neck – it cuts only with the disc, which enters the material perpendicular to the axis.
Cutting edges only on the disc – why the cutter cannot plunge axially
Six straight peripheral cutting edges and cutting faces produce a slot with clean walls. All torque passes through the neck, which has no cutting edges, so feed the disc into the material only radially and without jerking.
Slot length depends on plunge depth
The slot bottom is an arc with a radius of 19.25 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)) ≈ 25.9 mm.
Applications of the 38.5x8.0 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 Ø12.0 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 38.5x8.0 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 | 165–248 | 25–74 |
| P Quenched and tempered alloy steel | 15–25 | 0.025–0.050 | 124–207 | 19–62 |
| M Stainless steel 304 / 316 | 9–18 | 0.025–0.048 | 74–149 | 11–43 |
| K Gray cast iron | 18–30 | 0.025–0.060 | 149–248 | 22–89 |
| N Aluminum, brass | 25–50 | 0.025–0.065 | 207–413 | 31–161 |
Calculating spindle speed and feed for structural steel
For structural steel, use vc = 25 m/min – at a diameter of 38.5 mm, this gives 207 rpm. Calculate the feed rate from vf = fz × z × n: at fz = 0.035 mm and 6 cutting edges, the result is 43 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 38.5x8.0 mm – frequently asked questions
Applications, clamping and cutting data
Frequently asked questions
For grooves and slots 8.0 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 Ø12.0 mm. The plain straight shank has no clamping flat, so a drill chuck is unsuitable.
For vc = 25 m/min, the result is 207 rpm. With the disc cutting across its full width, start at the lower end of the range and adjust after the first slot.
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.
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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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