- 98% satisfied customers
- 72h delivery
- 30 dni na zwrot
Description
CUTTING WIDTH3 mm
CUTTING DEPTH T MAX20 mm
MAX. BAR DIAMETERØ40 mm
INSERT · 2 EDGESMGMN 300
Left-hand parting tool 20X20 3 mm T20 Smoxh
Technical data for the holder for Korloy MGMN 300 inserts
| Technical data | |
|---|---|
| Designation | BDKT L 2020 K3C T20 |
| Type | holder for parting and external grooving |
| Shank height h | 20 mm |
| Shank width B | 20 mm |
| Overall length L | 125 mm |
| Dimension S (to the insert edge) | 20.4 mm |
| Cutting depth T max | 20 mm |
| Max. parting diameter D max | Ø40 mm |
| Insert pocket | MGM. 3C (MGMN 300, width 3 mm) |
| Hand | L – left-hand (right-hand version: SM09509) |
BDKT-L 2020 K3C T20 – parting and grooving with an MGMN 300 insert
What this tool can do, screw clamping and a double-edged insert
The BDKT Smoxh tool holder series also includes left-hand parting tool 3 mm BDKT-L 2020 K3C T20 for parting off workpieces and cutting grooves. The cutting depth of 20 mm allows parting off bar stock up to Ø40 mm. The MGMN 300 insert is secured by a screw clamp from above, so you can replace it without removing the tool from the tool post.
The head forms a thin blade 20 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 3 mm groove. This sets the limit: the tool parts off bars up to Ø40 mm, or twice T max.
The MGMN 300 insert is double-edged: when one edge becomes dull, rotate it by 180° and cut with the other end.
The insert edge projects 0.4 mm beyond the side of the shank (S = 20.4 mm with B = 20 mm). When cutting close to the chuck, the cutting edge engages while the shank stays clear of the workpiece face. The 20x20 mm shank with a length of 125 mm is a common size for tool posts on general-purpose and CNC lathes.
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 Ø40 mm, a 3 mm kerf, and material loss limited to the insert width.
Cutting external grooves
A 3 mm groove between shaft shoulders or a retaining ring groove at the end of a journal, up to 20 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 300 has a cutting edge at both ends. One edge dull? Rotate the insert by 180° and use the other.
Material loss: 3 mm
Each parting cut turns only 3 mm of bar into chips. For 100 parts, this consumes 10 cm less bar than a tool with a 4 mm insert.
Dimensions and cutting reach – dimensional drawing
Side view and top view
HEIGHT h
20 mm
WIDTH B
20 mm
LENGTH L
125 mm
DIMENSION S
20.4 mm
T max is measured from the insert tip to the head shoulder. A groove shallower than 20 mm can also be cut in a bar larger than Ø40 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 2020 K3C T20
Five elements of the Smoxh code, read from the left
Designation: BDKT L 2020 K3C T20
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 SM09509.
2020
Element 3
shank
shank
20x20 mm
2020
2020
The first two digits indicate height h, and the next two indicate width B. Fits a tool post for 20 mm tools.
K3C
Element 4
insert pocket
insert pocket
MGM. 3C
K3C
K3C
K – Korloy MGMN insert system, 3 – cutting width of 3 mm. Versions K2C…K8C accept inserts from 2 to 8 mm.
T20
Element 5
depth
depth
T max 20 mm
T20
T20
Blade length from the insert tip to the head shoulder. Maximum parting diameter is 2 × T max = Ø40 mm.
Smoxh catalog convention, not ISO 5608 · dimensions: h 20 · B 20 · L 125 · S 20.4 mm
Parting data – speeds and feeds for a 3 mm insert
Starting values with coolant; refer to the insert grade data sheet for definitive data
The values apply to coated MGMN 300 inserts used with coolant. Use the higher speeds with rigid clamping and short overhang.
| Workpiece material | Vc [m/min] | fn [mm/rev] |
|---|---|---|
| PCarbon steel | 140–190 | 0.07–0.15 |
| PAlloy steel | 120–160 | 0.07–0.15 |
| PHardened steel | 60–120 | 0.07–0.12 |
| MStainless steel | 120–160 | 0.07–0.15 |
| KCast iron | 150–200 | 0.07–0.15 |
Starting spindle speed: n = (1000 × Vc) / (π × D). For a Ø40 mm carbon steel bar at Vc = 170 m/min: n = (1000 × 170) / (3.14 × 40) ≈ 1350 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 Ø40 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 300 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 Ø40 mm
Cutting insert not included
COMPATIBLE WITH:
| ✓ | MGMN 300 parting inserts (Smoxh: MGM. 3C) – width 3.0 mm, length 21 mm, height 4.8 mm |
| ✓ | BKTV M6x25 clamping screw (spare part) and AA5 wrench |
| ✓ | Right-hand version BDKT-R 2020 K3C T20 (SM09509) with the same dimensions |
Smoxh parting tools and boring bars for MGMN 300 inserts
BDKT R/L 1212 K3C T1812x12 mm | L 100 mm | T max 18 mm | Ø36 mmR right-hand
←L left-hand
→
←L left-hand
→
BDKT R/L 1616 K3C T1816x16 mm | L 125 mm | T max 18 mm | Ø36 mmR right-hand
←L left-hand
→
←L left-hand
→
BDKT R/L 2020 K3C T T2020x20 mm | L 125 mm | T max 20 mm | Ø40 mmR right-hand
←L left-hand
→
←L left-hand
→
BDKT R/L 2525 K3C T2225x25 mm | L 150 mm | T max 22 mm | Ø44 mmR right-hand
←L left-hand
→
←L left-hand
→
BDKT R/L 2525 K3C T T2225x25 mm | L 150 mm | T max 22 mm | Ø44 mmR right-hand
←L left-hand
→
←L left-hand
→
BDKT R/L 2525 K3C T2525x25 mm | L 150 mm | T max 25 mm | Ø50 mmR right-hand
←L left-hand
→
←L left-hand
→
BDKT R/L 2525 K3C T T2525x25 mm | L 150 mm | T max 25 mm | Ø50 mmR right-hand
←L left-hand
→
←L left-hand
→
BDKT R/L 2525 K3C T4025x25 mm | L 170 mm | T max 40 mm | Ø80 mmR right-hand
←L left-hand
→
←L left-hand
→
BDKT R/L 3232 K3C T2232x32 mm | L 170 mm | T max 22 mm | Ø44 mmR right-hand
←L left-hand
→
←L left-hand
→
BIKT R/L 20 K3C T6Ø20 mm | Ømin 26 mm | L 170 mm | T max 6 mmR right-hand
←L left-hand
→
←L left-hand
→
BIKT R/L 25 K3C T7Ø25 mm | Ømin 32 mm | L 200 mm | T max 7 mmR right-hand
←L left-hand
→
←L left-hand
→
BIKT R/L 32 K3C T8Ø32 mm | Ømin 40 mm | L 250 mm | T max 8 mmR right-hand
←L left-hand
→
←L left-hand
→
BIKT R/L 40 K3C T10Ø40 mm | Ømin 50 mm | L 300 mm | T max 10 mmR right-hand
←L left-hand
→
←L left-hand
→
Inserts from other grooving systems (DGN, GTN, KGM) use different pockets and do not fit this holder. The 3 mm BDKT-L 2020 K3C T20 left-hand parting tool cuts carbon, alloy and stainless steel, as well as cast iron, provided the insert grade matches the material. The limit remains Ø40 mm bar stock. With parting off hardened steel reduce the cutting speed to 60–120 m/min. In hydraulic applications, it cuts grooves for sealing rings and parts off bushings from bar stock.
Frequently asked questions
An MGMN 300 parting insert (in the Smoxh catalog: MGM. 3C) with a width of 3.0 mm, length of 21 mm, and height of 4.8 mm. It is double-ended, so one insert provides two cutting edges. DGN, GTN, and KGM inserts do not fit this pocket.
Ø40 mm, which is twice the cutting depth T max = 20 mm. For thicker bars, choose the 2525 K3C T22 version (up to Ø44 mm) or T25 (up to Ø50 mm). Grooves shallower than 20 mm can also be cut on larger diameters.
The left-hand L version is a mirror image of the right-hand tool (code SM09509) with identical dimensions. Choose it when the workpiece is clamped on the opposite side of the tool or when the tool post arrangement on your lathe requires it. With the workpiece in the chuck to the left of the tool, the R version is standard.
No. The tool is sold without a cutting insert, and the MGMN 300 insert must be purchased separately. Inserts in different carbide grades fit the same holder, allowing one tool to machine steel, stainless steel and cast iron.
Product accessories
Reviews
No customer reviews for the moment.
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 |
Recommended for you
Turning tool BDAT-R-25x25 K3C (24-36) T17 Smoxh
€90.63 tax inc.
Last items in stock
Instant Shipping
This website uses its own and third-party cookies to improve our services and show you advertising related to your preferences by analyzing your browsing habits. To give your consent to its use, press the Accept button.
Cookie preferences
Functional cookiesTechnical
Functional cookies are strictly necessary to provide the services of the shop, as well as for its proper functioning, so it is not possible to refuse their use. They allow the user to browse through our website and use the different options or services that exist on it.
Advertising Cookies
These are cookies that collect information about the advertisements shown to users of the website. They can be anonymous, if they only collect information about the advertising spaces shown without identifying the user, or personalised, if they collect personal information about the user of the shop by a third party, for the personalisation of these advertising spaces.
Analytics cookies
Collect information about the user's browsing experience in the shop, usually anonymously, although sometimes they also allow the user to be uniquely and unequivocally identified in order to obtain reports on the user's interests in the products or services offered by the shop.