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Description
VBMT 110304 turning insert – single-sided 35° diamond
| Technical data | |
|---|---|
| Side length l | 11 mm |
| Insert thickness s | 3.18 mm |
| Hole diameter d1 | 2.8 mm |
| Corner radius rε | 0.4 mm |
| ANSI code | VBMT 221 |
| Inscribed circle diameter IC | 6.35 mm |
Cutting data for the VBMT insert for steel and stainless steel
finishing, semi-finishing and roughing — ISO P and M groups
| Material | Finishing | Semi-finishing | Roughing | ||||||
|---|---|---|---|---|---|---|---|---|---|
| Vc [m/min] | Feed f [mm/rev] | ap [mm] | Vc [m/min] | Feed f [mm/rev] | ap [mm] | Vc [m/min] | Feed f [mm/rev] | ap [mm] | |
| PSteel | 200-295 | 0.05 | 0.1 | 170-240 | 0.1 | 0.3 | 150-215 | 0.19 | 1.7 |
| MStainless steel | 110-230 | 0.05 | 0.1 | 70-175 | 0.1 | 0.3 | 50-135 | 0.19 | 1.7 |
Single-sided H6310 cemented carbide insert – applications and construction
positive 35° diamond with a hole, countersink, and chip breaker
The VBMT 110304 turning insert is a single-sided, diamond-shaped indexable insert made of grade H6310 cemented carbide, designed for turning steel and stainless steel. The V shape, a diamond with an acute 35° corner angle, facilitates copy turning and profiling complex contours. Positive geometry with a 5° clearance angle (letter B) reduces cutting forces and performs well on slender workpieces prone to deflection. The insert has two working corners on one side, providing two cutting edges. The rε 0.4 mm nose radius provides a smooth surface at the low feeds typical of finishing operations.
Key advantages of the H6310 cemented carbide insert
- Acute 35° corner — allows access to undercuts, grooves, and profiled surfaces inaccessible to inserts with 80° or 90° corners.
- Grade H6310 for ISO groups P and M — general-purpose PVD-coated carbide: steel (P20-P40) and stainless steel (M20-M40), and occasionally cast iron.
- Positive geometry with a 5° angle — lower cutting forces and lighter cutting action on thin-walled workpieces and those prone to deflection.
- The rε 0.4 mm nose radius provides a smooth surface at low feeds — typical finishing geometry.
- Dimensions according to ISO 1832: edge length 11 mm, IC 6.35 mm (1/4″), thickness 3.18 mm — fit holders with a 11 pocket.
- Tolerance class M ensures repeatable edge positioning after indexing the insert to the second corner in the pocket.
Applications and cutting data selection for the diamond-shaped insert
The VBMT 110304 insert (also written without a space as vbmt110304) performs well in finishing shafts, journals, and profiled surfaces made of structural steels, as well as stainless steel components. The acute 35° corner allows complex contours to be reproduced without changing tools between passes. The hole and countersink design (type T according to ISO 1832) secures the insert with a screw, while the single-sided chip breaker controls chip flow during turning. PVD-coated grade H6310 covers ISO groups P20-P40 and M20-M40, and also performs well in occasional cast iron applications.
Calculate spindle speed using n = 1000·Vc/(π·D): for a shaft diameter of 40 mm at a cutting speed of Vc = 250 m/min, the result is approximately 1989 rpm. For stainless steels, maintain a speed of 110–230 m/min and a constant feed to reduce work hardening of the layer being cut. For finishing, select a feed close to the nose radius — for rε 0.4 mm, a feed of 0.05–0.1 mm/rev provides a good surface finish. Ensure rigid workpiece and tool clamping, as the slender 35° corner is less resistant to vibration than obtuse corners. Grade H6310 indexable inserts are supplied by the Korean brand Horn.
▲
Application limitation
The acute 35° corner and small radius rε 0.4 mm provide finishing geometry — at a large depth of cut (ap) the corner is prone to chipping. For roughing, select an insert with a larger corner angle (e.g., shape C 80°) and a larger radius.
Rhombic insert designation decoder according to ISO 1832
how to read the VBMT 110304 code — positions 1–7 of the designation
Designation VBMT 110304 according to the standard ISO 1832: 4 letters describe geometry and construction, 3 numeric codes describe dimensions. Each field has a number, an icon, and a brief description.
Compatible turning tools
holders with a V pocket (35° diamond) — external and internal turning
SVJBR/L 1212 F1112×12 × 80 mmR right-hand
←L left-hand
→
←L left-hand
→
SVJBR/L 1616 H1116×16 × 100 mmR right-hand
←L left-hand
→
←L left-hand
→
SVJBR/L 2020 K1120×20 × 125 mmR right-hand
←L left-hand
→
←L left-hand
→
SVJBR/L 2525 M1125×25 × 150 mmR right-hand
←L left-hand
→
←L left-hand
→
SVVBN 1616 H1116×16 × 100 mmNeutral
↔
↔
SVVBN 2020 K1120×20 × 125 mmNeutral
↔
↔
SVVBN 2525 M1125×25 × 150 mmNeutral
↔
↔
SVHBR/L 1616 H1116×16 × 100 mmR right-hand
←L left-hand
→
←L left-hand
→
SVHBR/L 2020 K1120×20 × 125 mmR right-hand
←L left-hand
→
←L left-hand
→
SVHBR/L 2525 M1125×25 × 150 mmR right-hand
←L left-hand
→
←L left-hand
→
SVZBR/L 1616 H1116×16 × 100 mmR right-hand
←L left-hand
→
←L left-hand
→
SVZBR/L 2020 K1120×20 × 125 mmR right-hand
←L left-hand
→
←L left-hand
→
SVZBR/L 2525 M1125×25 × 150 mmR right-hand
←L left-hand
→
←L left-hand
→
S16P SVUBR/L-11Ø16 | Ømin 21 mm | L=170R right-hand
←L left-hand
→
←L left-hand
→
S20R SVUBR/L-11Ø20 | Ømin 25 mm | L=200R right-hand
←L left-hand
→
←L left-hand
→
S25S SVUBR/L-16Ø25 | Ømin 32 mm | L=250R right-hand
←L left-hand
→
←L left-hand
→
S16P SVQBR/L-11Ø16 | Ømin 21 mm | L=170R right-hand
←L left-hand
→
←L left-hand
→
S20R SVQBR/L-11Ø20 | Ømin 25 mm | L=200R right-hand
←L left-hand
→
←L left-hand
→
S25S SVQBR/L-16Ø25 | Ømin 32 mm | L=250R right-hand
←L left-hand
→
←L left-hand
→
S16P SVXBR/L-11Ø16 | Ømin 21 mm | L=170R right-hand
←L left-hand
→
←L left-hand
→
S20R SVXBR/L-11Ø20 | Ømin 25 mm | L=200R right-hand
←L left-hand
→
←L left-hand
→
S25S SVXBR/L-16Ø25 | Ømin 32 mm | L=250R right-hand
←L left-hand
→
←L left-hand
→
Frequently asked questions about the VBMT 110304 insert
use, turning tool selection, and turning parameters
Two — the diamond has 2 acute 35° corners, while the positive, single-sided design (letter B) uses only one side of the insert. Once one corner is worn, simply rotate the insert in its pocket without changing the holder.
Holders with a V-shaped diamond pocket (IC 6.35 mm): for external turning SVJBR/L, SVHBR/L and SVZBR/L (right-hand and left-hand versions) and neutral SVVBN with cross sections of 12×12–25×25 mm; for internal turning, boring bars S16P–S25S with the suffix SVUBR/L, SVQBR/L, or SVXBR/L.
Only in corner radius: 0.2 mm is used for high-precision finishing at fine feeds, while 0.4 mm is a slightly stronger finishing version that provides a better surface finish. The remaining dimensions (IC 6.35 mm, side length 11 mm, thickness 3.18 mm) are identical.
Yes — grade H6310 covers group ISO M20-M40. Maintain a cutting speed of 110–230 m/min, a constant feed, and continuous emulsion cooling: austenitic steel conducts heat poorly and work-hardens when cutting is too slow.
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| 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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