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Description
DIAMETER DØ38.5 mm
THICKNESS b10.0 mm
MATERIALHSS
STANDARDDIN 850 A
T-slot cutter 38.5x10.0 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 | 10.0 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 38.5x10.0 mm – construction and Ø12.0 mm shank
Tool construction and application limits
The 38.5x10.0 mm T-slot cutter to DIN 850 A is a shank-type tool of type NFRh for grooves and slots 10.0 mm wide. The Ø38.5 mm disc enters the material radially and machines a slot with an arcuate bottom in a single pass.
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 10.0 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 plunged disc leaves a slot with an arcuate bottom and a radius of 19.25 mm. Its length depends on depth: for t = 5 mm, the arc chord is l = 2√(t × (D − t)) ≈ 25.9 mm. The same cutter therefore produces slots of different lengths – controlled by plunge depth, not longitudinal feed.
Applications of the 38.5x10.0 mm T-slot cutter – grooves and slots
Tool application range
The 10.0 mm width and Ø38.5 mm diameter do not match a Woodruff key size in DIN 6888 – this is a tool for grooves and slots: grooves for retaining rings and seals, lubrication grooves, slots for sheet metal and pins, and cutting through thin walls. Select the plunge depth to suit the required slot length, not the tool diameter – with the full disc width engaged, each additional millimeter of penetration increases cutting forces 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 38.5x10.0 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 | 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
Starting point: vc = 25 m/min. The formula n = 1000 × vc / (π × D) gives 207 rpm, and the feed rate at fz = 0.035 mm with 6 cutting edges is 43 mm/min. Full-width cutting traps chips in the slot – without abundant coolant, they pass back under the cutting edge and chip it.
T-slot cutter 38.5x10.0 mm – frequently asked questions
Applications, clamping and cutting data
Frequently asked questions
For grooves and slots 10.0 mm wide – grooves for retaining rings and seals, lubrication grooves, recesses for sheet metal, and cutting through thin walls.
This combination of diameter and thickness does not match any key size in DIN 6888. For keys, select a cutter with a diameter 0.5 mm larger than the slot diameter and a thickness equal to the key width.
No. The neck behind the disc has no cutting edges and breaks during axial entry. Feed the disc radially.
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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