The insert geometry published in full
Hunricho 0028-1236, two boring bars and ten VCMT inserts
The only listing on this shelf that publishes the insert geometry — nose radius, thickness, bore, included angle — and the alloy the holder is made of.
Of the nine American listings on this shelf, this is the one that publishes what is actually in the pocket. The insert is a VCMT110304, and the page gives its geometry in full: 35-degree included angle, 0.43 in edge length, 0.125 in thick, 0.11 in bore, a 1/64 in nose radius, single sided, solid carbide with a multilayer coating. Nothing else here describes an insert at all beyond “CVD coated”.
The geometry is the point. A 35-degree rhombic insert is a profiling tool: narrow enough at the nose to cut into a corner and back out along a shoulder, where the 80-degree inserts in the seven-piece sets on this shelf cannot reach. It is also the sharp, positive geometry this hub’s buying tip recommends for a light machine, which is why ten of them come in the box — a narrow point chips, and the answer is spares rather than a tougher insert that will rub instead of cut.
The holders are a matched right and left pair with a 3-degree lead angle, in 40CrMnTi — a hardened alloy steel, correctly named, where three listings on this shelf call their holders cemented carbide. What you do not get is a grooving, threading or boring tool: this is two profiling holders and a lot of edges, not a set.
Availability
Read on the day this page was built: $27 at the American Amazon shop.
Read from Keepa on the day this page was last revised; stock and price both move without notice.
Prices quoted in this text were read on 2026-10-07. The live price is at the top of the page.
The questions welders ask
Why is a 35-degree insert worth having?
Because of what it can reach. A VCMT insert is a narrow rhombus with a 35-degree included angle at the nose, which lets it cut into a corner, follow a profile and come back out along a shoulder — work that an 80-degree CCMT insert simply cannot get into. The price is strength: the same narrow point that reaches is the point that chips if the tool deflects or the work moves. Ten inserts in the box is the sensible response to that.
What does 40CrMnTi tell me?
That the holder is hardened alloy steel, which is what a tool holder should be. 40CrMnTi is a chromium-manganese-titanium alloy steel used for gears and shafts, hardened and tempered for toughness rather than extreme hardness — it has to hold an insert rigidly and absorb vibration without cracking. Three listings on this shelf describe their holders as "cemented carbide", which no holder at any price on this page is; this one names the actual steel.
Is it 1/2 inch or 12 mm (0.47 in)?
Twelve millimeters. The designation SVJCR1212H11 is explicit: the first two digits are the shank in millimeters, so 12 by 12. One half inch is 12.7 mm (0.50 in), so a 12 mm (0.47 in) holder in a tool post clamped for 1/2 in sits 0.7 mm (0.03 in) low — enough to put the cutting edge below center height, which on a small lathe shows up as a poor finish and a rubbing tool. Five listings on this shelf carry the same "1/2 in (12 mm)" wording.
