Kennametal A12S-SVMBR3E 3/4in RH SVMB Indexable Boring Bar
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The Kennametal A12S-SVMBR3E is a right-hand, screw-clamp (S-style) indexable boring bar with a 3/4 in (0.750 in) round steel shank, designed to accept VBMT-style inserts (35° diamond, V-shape) in a 3-edge configuration at a 3° relief angle and 75° lead angle — all encoded in the SVMBR3 designation. The "E" suffix designates the boring bar series/style per Kennametal's SVMB product family, and the "F5NW" stamp visible on the second unit identifies a manufacturing or lot code. The bar features a screw-on (Torx or hex) top-clamp insert retention system visible in the photos, with the characteristic angled head geometry that provides clearance for internal diameter (ID) boring operations on CNC lathes and manual turning centers. This item is new — other condition, meaning it is unused but may have minor cosmetic blemishes or non-original packaging; photos show a clean, unissued bar with no wear on the insert pocket or shank. Compatible inserts are the VBMT 110302 / VBMT 110304 / VBMT 110308 family (3/32 in IC diamond inserts); minimum bore diameter is approximately 1.00 in based on the A12S shank class.
Product Specifications
| Brand | Kennametal |
| MPN | A12S-SVMBR3E |
| Lot/Revision Code | F5NW |
| Shank Diameter | 3/4 in (0.750 in) |
| Shank Shape | Round |
| Shank Material | Steel |
| Hand of Cut | Right-Hand (R) |
| Insert Clamping Style | Screw-On (S) |
| Insert Style | VBMT (V = 35° diamond, B = 5° relief) |
| Insert Shape | V — 35° Diamond |
| Insert Clearance Angle | B — 5° |
| Lead Angle | 75° |
| Number of Insert Edges | 3 |
| Compatible Insert | VBMT 110302, VBMT 110304, VBMT 110308 |
| Min. Bore Diameter | ~1.00 in |
| Operation Type | Internal Boring (ID Turning) |
| Condition | New — Other (unused, may lack orig. packaging) |