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Description
GROOVE WIDTH3 mm
GROOVE DEPTH T MAX6 mm
MIN. BORE DIAMETERØ26 mm
INSERT · 2 EDGESMGMN 300
Turning tool 20 mm 3 mm Smoxh groove boring bar
Technical data for the boring bar for Korloy MGMN 300 inserts
| Technical data | |
|---|---|
| Designation | BIKT L 20 K3C T6 |
| Manufacturer's code | SM11335 |
| Shank diameter d | Ø20 mm |
| Height to flat h | 18 mm |
| Overall length L | 170 mm |
| Head length l | 33 mm |
| Dimension f (centerline – cutting edge) | 15.75 mm |
| Groove depth T max | 6 mm |
| Minimum bore diameter D min | Ø26 mm |
| Insert pocket | MGM. 3C (MGMN 300, width 3 mm) |
| Hand | L – left-hand (right-hand version: SM11199) |
BIKT-L 20 K3C T6 – how it works with an MGMN 300 insert
Round shank with a flat, screw clamp, and double-ended insert
Left-hand grooving boring bar 3 mm BIKT-L 20 K3C T6 is a Smoxh tool for cutting internal grooves in bores from Ø26 mm. The MGMN 300 carbide insert is held by a screw clamp: the BKTV M5x17 screw pulls the flexible lip of the head against the insert. Replacing the insert takes a dozen or so seconds, without removing the tool from the holder.
The shank is a Ø20 mm bar, 170 mm long, with a flat machined to a height of h = 18 mm. The flat locates the cutting edge in the reduction sleeve or V-block tool holder, so the insert edge returns to the same height each time it is clamped.
The 33 mm long head carries an insert pointing radially outward. The cutting edge projects 6 mm beyond the shank profile, which is the groove depth T max. This sets the limit: the Ø20 mm shank plus the 6 mm cutting edge projection gives a minimum bore diameter D min = Ø26 mm.
The MGMN 300 insert is double-ended. When one edge becomes dull, rotate it 180° and use the other end.
What this tool can machine – grooves in bores
Internal groove in a single pass
A 3 mm groove for a retaining ring, seal, or undercut in a bore, up to 6 mm deep. The insert feeds radially into the wall to the specified depth.
Groove wider than the insert
Two adjacent passes, with side turning between them at a depth of up to 0.8 × 3 mm = 2.4 mm. The -M or -T geometry allows side cutting.
Screw clamp
The BKTV M5x17 screw draws the head's flexible lip against the insert. The insert can be changed without removing the tool from the holder.
Double-edged insert
MGMN 300 has a cutting edge at both ends. One edge dull? Rotate the insert by 180° and use the other.
Bores from Ø26 mm
The Ø20 mm shank and 6 mm cutting edge projection must fit in the bore together: D min = 20 + 6 = Ø26 mm. In a smaller bore, the shank will contact the wall.
Dimensions and grooving reach – dimensional drawing
Top view, enlarged head detail, and end view in a D min bore
DIAMETER d
Ø20 mm
HEIGHT h
18 mm
LENGTH L
170 mm
DIMENSION f
15.75 mm
Dimension f = 15.75 mm is the distance from the shank centerline to the cutting edge. Dimension T max = 6 mm indicates the catalog grooving reach; the enlarged detail shows it from the head profile to the cutting edge. The end view shows the tool in a Ø26 mm bore: the cutting edge reaches the wall, with only working clearance remaining on the opposite side of the shank.
The tool enters through the bore opening, and the insert cuts radially into the wall to the groove depth. Chips have little room inside the bore, so direct coolant onto the insert and retract it every few millimeters. Set the cutting edge at the bore centerline height within ±0.1 mm.
Designation decoder for BIKT L 20 K3C T6
Five elements of the Smoxh code, read from the left
Designation: BIKT L 20 K3C T6
BIKT
Element 1
holder type
holder type
For internal grooves
BIKT
BIKT
Smoxh series for internal grooving with a round shank and screw clamp. The external parting counterpart carries the BDKT code.
L
Element 2
hand
hand
Left-hand
L
L
A mirror image of the right-hand version, for operation with the opposite feed direction or spindle rotation. The R version has code SM11199.
20
Element 3
shank
shank
Ø20 mm
20
20
Round shank diameter in millimeters. The flat at h = 18 mm locates the cutting edge in a Ø20 mm reduction sleeve or V-block tool holder.
K3C
Element 4
insert pocket
insert pocket
MGM. 3C
K3C
K3C
K – Korloy MGMN insert system, 3 – groove width 3 mm. The same element in the BDKT code denotes the same pocket.
T6
Element 5
depth
depth
T max 6 mm
T6
T6
Cutting edge projection beyond the shank profile, which is the maximum groove depth. Together with the shank diameter, it gives the minimum bore D min = Ø26 mm.
Smoxh catalog convention, not ISO 5610 · dimensions: d Ø20 · h 18 · L 170 · f 15.75 mm
Internal grooving cutting data – speeds and feeds for a 3 mm insert
Starting values with coolant; refer to the insert grade data sheet for definitive data
Values apply to coated MGMN 300 inserts when machining with coolant. Chips have less room inside a bore than outside, so start in the lower half of the feed range and keep tool overhang as short as possible.
| 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 |
Calculate spindle speed from the bore diameter, not the shank diameter: n = (1000 × Vc) / (π × D). For a Ø26 mm bore in carbon steel at Vc = 170 m/min: n = (1000 × 170) / (3.14 × 26) ≈ 2080 rpm. For a Ø60 mm bore, approximately 900 rpm is sufficient because the same cutting speed applies over a larger circumference.
▲
Operating limitations
Do not enter a bore smaller than Ø26 mm: the shank will contact the wall before the cutting edge reaches the full groove depth. Keep overhang from the holder as short as possible, approximately up to 4 × d = 80 mm, because a longer steel bar starts to vibrate and chips the insert corner. For a retaining ring groove, check the insert width with a caliper: the groove must be wider than the ring by the clearance specified in the ring standard, rather than equal to the insert width.
Installing the MGMN 300 insert in 3 steps
1Loosen
the BKTV M5x17 screw with the wrench SAK-AA4, 2–3 turns
2Seat
clean the pocket, slide the insert in until fully seated
3Tighten
and check that the cutting edge is at bore centerline height ±0.1 mm
✓Ready
grooves in bores from Ø26 mm
Cutting insert not included
COMPATIBLE WITH:
| ✓ | MGMN 300 grooving inserts (Smoxh: MGM. 3C) – width 3 mm, length 21 mm, height 4.8 mm |
| ✓ | BKTV M5x17-9211 clamping screw (spare part) and SAK-AA4-9903 wrench |
| ✓ | Mirror-image version BIKT-R 20 K3C T6 (SM11199) with the same dimensions |
| ✓ | Holders for a Ø20 mm round shank with a flat: reduction sleeve or V-block tool holder |
Smoxh grooving boring bars and parting tools for MGMN 300 inserts
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
→
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 T2020x20 mm | L 125 mm | T max 20 mm | Ø40 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
→
The left-hand 3 mm BIKT-L 20 K3C T6 grooving boring bar cuts grooves 3 mm wide and up to 6 mm deep in bores from Ø26 mm, in carbon steel at a speed of 140–190 m/min and a feed of 0.07–0.15 mm/rev. In hydraulic and pneumatic applications, it can be used to machine internal grooves for sealing and retaining rings in bushings and cylinders. Inserts from other grooving systems, such as DGN or KGM, use different pockets and do not fit this holder.
Frequently asked questions
An MGMN 300 grooving insert (in the Smoxh catalog: MGM. 3C) with a width of 3 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.
Ø26 mm. This is the shank diameter of 20 mm plus the groove depth of 6 mm. In a smaller bore, the shank will contact the opposite wall before the cutting edge reaches full depth. BIKT L 25 K3C T7 works in larger bores (from Ø32 mm), and this tool has no restrictions there.
Start at approximately 2080 rpm for carbon steel, at Vc = 170 m/min with a 3 mm insert. Calculate spindle speed from the bore diameter, so approximately 900 rpm is sufficient for Ø60 mm. For stainless steel, use Vc 120–160 m/min.
Up to 6 mm deep, which is T max. In a single pass, the groove width equals the insert width of 3 mm; wider grooves require adjacent passes and side turning. For grooves deeper than 3 mm, retract the insert every few millimeters to clear chips from the bore.
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| Courier GLS | Cash on delivery | 17,26 zł gross | Lead time 1 working day |
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