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Description
GROOVE WIDTH3 mm
GROOVE DEPTH T MAX7 mm
MIN. BORE DIAMETERØ32 mm
INSERT · 2 EDGESMGMN 300
Grooving boring bar 25 mm 3 mm Smoxh
Technical data for the boring bar for Korloy MGMN 300 inserts
| Technical data | |
|---|---|
| Designation | BIKT R 25 K3C T7 |
| Manufacturer's code | SM11205 |
| Shank diameter d | Ø25 mm |
| Height to flat h | 23 mm |
| Overall length L | 200 mm |
| Head length l | 45 mm |
| Dimension f (centerline – cutting edge) | 19.25 mm |
| Groove depth T max | 7 mm |
| Minimum bore diameter D min | Ø32 mm |
| Insert pocket | MGM. 3C (MGMN 300, width 3 mm) |
| Hand | R – right-hand (left-hand version: SM11342) |
BIKT-R 25 K3C T7 – how it works with an MGMN 300 insert
Round shank with a flat, screw clamp, and double-ended insert
Grooving boring bar 3 mm BIKT-R 25 K3C T7 is a Smoxh tool for cutting internal grooves in bores from Ø32 mm. The MGMN 300 carbide insert is held by a screw clamp: the BKTV M6x21 screw draws the head's flexible lip against the insert. Changing the insert takes a dozen or so seconds without removing the tool from the holder.
The shank is a Ø25 mm bar, 200 mm long, with a flat machined to a height of h = 23 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 45 mm long head carries an insert pointing radially outward. The cutting edge projects 7 mm beyond the shank profile, which is the groove depth T max. This sets the limit: the Ø25 mm shank plus the 7 mm cutting edge projection gives a minimum bore diameter D min = Ø32 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 7 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 M6x21 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 Ø32 mm
The Ø25 mm shank and 7 mm cutting edge projection must fit in the bore together: D min = 25 + 7 = Ø32 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
Ø25 mm
HEIGHT h
23 mm
LENGTH L
200 mm
DIMENSION f
19.25 mm
Dimension f = 19.25 mm is the distance from the shank centerline to the cutting edge. Dimension T max = 7 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 Ø32 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.
BIKT R 25 K3C T7 designation decoder
Five elements of the Smoxh code, read from the left
Designation: BIKT R 25 K3C T7
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.
R
Element 2
hand
hand
Right-hand
R
R
Standard arrangement with the workpiece in the chuck to the left of the tool: the boring bar enters the bore from the tailstock side. Version L is the mirror image – code SM11342.
25
Element 3
shank
shank
Ø25 mm
25
25
Round shank diameter in millimeters. The flat at h = 23 mm locates the cutting edge in a Ø25 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.
T7
Element 5
depth
depth
T max 7 mm
T7
T7
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 = Ø32 mm.
Smoxh catalog convention, not ISO 5610 · dimensions: d Ø25 · h 23 · L 200 · f 19.25 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 Ø32 mm bore in carbon steel at Vc = 170 m/min: n = (1000 × 170) / (3.14 × 32) ≈ 1690 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 Ø32 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 = 100 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 M6x21 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 Ø32 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 M6x21-9214 clamping screw (spare part) and SAK-AA4-9903 wrench |
| ✓ | Mirror-image version BIKT-L 25 K3C T7 (SM11342) with the same dimensions |
| ✓ | Holders for a Ø25 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 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 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 3 mm BIKT-R 25 K3C T7 grooving boring bar cuts grooves 3 mm wide and up to 7 mm deep in bores from Ø32 mm, at a cutting speed of 140–190 m/min and a feed of 0.07–0.15 mm/rev in carbon steel. In hydraulic and pneumatic applications, it cuts 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.
Ø32 mm. This is the 25 mm shank diameter plus the 7 mm groove depth. In a smaller bore, the shank will contact the opposite wall before the cutting edge reaches full depth. For narrower bores, from Ø26 mm, choose BIKT R 20 K3C T6. BIKT R 32 K3C T8 operates in larger bores (from Ø40 mm), and this tool has no restrictions there.
Start at approximately 1690 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 7 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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