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Description
CUTTING WIDTH2 mm
CUTTING DEPTH T MAX18 mm
MAX. BAR DIAMETERØ36 mm
INSERT · 2 EDGESMGMN 200
Left-hand parting tool 25X25 2 mm T18 Smoxh
Technical data for the holder for Korloy MGMN 200 inserts
| Technical data | |
|---|---|
| Designation | BDKT L 2525 K2C T18 |
| Type | holder for parting and external grooving |
| Shank height h | 25 mm |
| Shank width B | 25 mm |
| Overall length L | 150 mm |
| Dimension S (to the insert edge) | 25.3 mm |
| Cutting depth T max | 18 mm |
| Max. parting diameter D max | Ø36 mm |
| Insert pocket | MGM. 2C (MGMN 200, width 2 mm) |
| Hand | L – left-hand (right-hand version: SM09462) |
BDKT-L 2525 K2C T18 with screw clamping – operating principle
What this tool can do, screw clamping and a double-edged insert
Left-hand parting tool 2 mm BDKT-L 2525 K2C T18 is a Smoxh holder for parting off workpieces from bar stock and cutting external grooves. The MGMN 200 carbide insert is held by screw clamping from above: the BKTV M6x25 screw tightens the flexible jaw of the head against the insert. Replacement takes a dozen or so seconds, without removing the tool from the tool post.
The head forms a thin blade 18 mm long, which determines the cutting depth T max. Behind the blade, the head widens to the full shank width and can no longer enter the 2 mm groove. This sets the limit: the tool parts off bars up to Ø36 mm, or twice T max.
The MGMN 200 insert is double-edged: when one edge becomes dull, rotate it by 180° and cut with the other end.
The insert edge projects 0.3 mm beyond the side of the shank (S = 25.3 mm with B = 25 mm). When cutting close to the chuck, only the cutting edge engages; the shank does not rub against the workpiece face. The 25x25 mm shank, 150 mm long, provides the rigidity required by a narrow cutting edge in an enclosed groove.
What this tool can do – parting and grooving
Parting – cutting a part off a bar
The blade enters the bar all the way to the axis and the part separates. Bars up to Ø36 mm, a 2 mm kerf, and material loss limited to the insert width.
Cutting external grooves
A 2 mm groove between shaft shoulders or a retaining ring groove at the end of a journal, up to 18 mm deep. Cut wider grooves with several adjacent passes.
Screw clamping from above
The BKTV M6x25 screw draws the flexible lip of the head against the insert. Change the insert with an AA5 key without removing the tool from the tool post.
Double-edged insert
MGMN 200 has a cutting edge at both ends. One edge dull? Rotate the insert by 180° and use the other.
Material loss: 2 mm
Each parting cut turns only 2 mm of bar into chips. For 100 parts, this consumes 10 cm less bar than a tool with a 3 mm insert.
Dimensions and cutting reach – dimensional drawing
Side view and top view
HEIGHT h
25 mm
WIDTH B
25 mm
LENGTH L
150 mm
DIMENSION S
25.3 mm
T max is measured from the insert tip to the head shoulder. A groove shallower than 18 mm can also be cut in a bar larger than Ø36 mm.
The left panel of the diagram shows the end of the cut: the insert tip is on the bar axis, and the head shoulder touches its surface. The right panel shows cutting edge height: set the edge on the centerline to within ±0.1 mm. Below the centerline, a pip remains; above the centerline, the cutting edge rubs against the material.
Designation decoder for BDKT L 2525 K2C T18
Five elements of the Smoxh code, read from the left
Designation: BDKT L 2525 K2C T18
BDKT
Element 1
holder type
holder type
For parting
BDKT
BDKT
Smoxh series for external grooving and parting with screw clamping. The counterpart for internal grooving is designated BIKT.
L
Element 2
hand
hand
Left-hand
L
L
A mirror image of the right-hand version with the same dimensions. The R version has code SM09462.
2525
Element 3
shank
shank
25x25 mm
2525
2525
The first two digits indicate height h, and the next two indicate width B. Fits a tool post for 25 mm tools.
K2C
Element 4
insert pocket
insert pocket
MGM. 2C
K2C
K2C
K – Korloy MGMN insert system, 2 – cutting width of 2 mm. Versions K2C…K8C accept inserts from 2 to 8 mm.
T18
Element 5
depth
depth
T max 18 mm
T18
T18
Blade length from the insert tip to the head shoulder. Maximum parting diameter is 2 × T max = Ø36 mm.
Smoxh catalog convention, not ISO 5608 · dimensions: h 25 · B 25 · L 150 · S 25.3 mm
Parting data – speeds and feeds for a 2 mm insert
Starting values with coolant; refer to the insert grade data sheet for definitive data
The values apply to coated MGMN 200 inserts used with coolant. Use the higher speeds with rigid clamping and short overhang.
| Workpiece material | Vc [m/min] | fn [mm/rev] |
|---|---|---|
| PCarbon steel | 150–200 | 0.05–0.12 |
| PAlloy steel | 130–180 | 0.05–0.12 |
| PHardened steel | 90–130 | 0.05–0.10 |
| MStainless steel | 130–160 | 0.05–0.12 |
| KCast iron | 150–210 | 0.05–0.12 |
Starting spindle speed: n = (1000 × Vc) / (π × D). For a Ø36 mm carbon steel bar at Vc = 180 m/min: n = (1000 × 180) / (3.14 × 36) ≈ 1590 rpm. At constant spindle speed, the cutting speed decreases to zero at the centerline, so enable constant surface speed (G96) with a spindle speed limit on a CNC lathe.
▲
Operating limitations
Do not part off bars larger than Ø36 mm: the shoulder of the head will contact the material before the cutting edge reaches the centerline. Keep overhang from the tool post as short as possible. Over the final 2 mm before the centerline, reduce the feed by as much as 75% and direct coolant straight into the cut.
Installing the MGMN 200 insert in 3 steps
1Loosen
the BKTV M6x25 screw with the wrench AA5, 2–3 turns
2Seat
clean the pocket, slide the insert in until fully seated
3Tighten
and check that the cutting edge is on the lathe centerline ±0.1 mm
✓Ready
parting off bars up to Ø36 mm
Cutting insert not included
COMPATIBLE WITH:
| ✓ | MGMN 200 parting inserts (Smoxh: MGM. 2C) – width 2.0 mm, length 16 mm, height 3.5 mm |
| ✓ | BKTV M6x25 clamping screw (spare part) and AA5 wrench |
| ✓ | Right-hand version BDKT-R 2525 K2C T18 (SM09462) with the same dimensions |
Smoxh parting tools and boring bars for MGMN 200 inserts
BDKT R/L 1212 K2C T1512x12 mm | L 100 mm | T max 15 mm | Ø30 mmR right-hand
←L left-hand
→
←L left-hand
→
BDKT R/L 1616 K2C T1816x16 mm | L 125 mm | T max 18 mm | Ø36 mmR right-hand
←L left-hand
→
←L left-hand
→
BDKT R/L 1616 K2C T1216x16 mm | L 125 mm | T max 12 mm | Ø24 mmR right-hand
←L left-hand
→
←L left-hand
→
BDKT R/L 1616 K2C T2116x16 mm | L 125 mm | T max 21 mm | Ø42 mmR right-hand
←L left-hand
→
←L left-hand
→
BDKT R/L 2020 K2C T1820x20 mm | L 125 mm | T max 18 mm | Ø36 mmR right-hand
←L left-hand
→
←L left-hand
→
BDKT R/L 2020 K2C T1220x20 mm | L 125 mm | T max 12 mm | Ø24 mmR right-hand
←L left-hand
→
←L left-hand
→
BDKT R/L 3232 K2C T1832x32 mm | L 170 mm | T max 18 mm | Ø36 mmR right-hand
←L left-hand
→
←L left-hand
→
BIKT R/L 16 K2C T4Ø16 mm | Ømin 20 mm | L 150 mm | T max 4 mmR right-hand
←L left-hand
→
←L left-hand
→
BIKT R/L 20 K2C T6Ø20 mm | Ømin 26 mm | L 170 mm | T max 6 mmR right-hand
←L left-hand
→
←L left-hand
→
BIKT R/L 25 K2C T7Ø25 mm | Ømin 32 mm | L 200 mm | T max 7 mmR right-hand
←L left-hand
→
←L left-hand
→
Inserts from other grooving systems (DGN, GTN, KGM) require different pockets and do not fit this holder. The left-hand 2 mm BDKT-L 2525 K2C T18 parting tool cuts carbon steel at a speed of 150–200 m/min and a feed of 0.05–0.12 mm/rev. With parting off bars up to Ø36 mm, direct coolant into the cut and reduce the feed before reaching the centerline. In the production of fittings and pneumatic components, it parts off connectors, nipples and bushings from bar stock.
Frequently asked questions
An MGMN 200 parting insert (in the Smoxh catalog: MGM. 2C) with a width of 2.0 mm, length of 16 mm, and height of 3.5 mm. It is double-ended, so one insert provides two cutting edges. DGN, GTN, and KGM inserts do not fit this pocket.
Ø36 mm, or twice the cutting depth T max = 18 mm. For larger bars, choose the 1616 K2C T21 version (up to Ø42 mm). Grooves shallower than 18 mm can also be cut on larger diameters.
Start at approximately 1590 rpm for carbon steel, at Vc = 180 m/min with a 2 mm insert. Cutting speed decreases closer to the centerline, so use G96 constant surface speed with a spindle speed limit on a CNC lathe. For stainless steel, use Vc 130–160 m/min.
Up to 18 mm, which is the holder's T max. In a single pass, the groove width equals the insert width of 2 mm; wider grooves require several adjacent passes. For deep grooves, retract the insert every few millimeters to clear chips.
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