SISTHOR 12-3 — boring bar, 3/4" bar diameter. Made in the USA by RMC Tooling.
Steel-shank indexable boring bar from RMC Tooling, machined in the United States. Ground shank, standard indexable geometry, and a rigid clamping system sized to the bar diameter — the combination that keeps chatter down at the depths where boring bars usually give up.
Sized by minimum bore, so start there: pick the largest bar diameter your bore will clear. Every clamp, lock pin, seat and screw in this bar is a stocked RMC service part, listed below.
These are the service parts RMC lists for this style and insert size. Every one is stocked.
| Insert | TNMC-322 — 3/8" I.C. · 1/8" thick · 1/32" nose radius |
| Clamp | CL-19 |
| Clamp screw | XNS-36 |
| Torx key | T-10 — Torx Wrench |
| Insert Torx screw | GTS-1 |
See all RMC spare parts & hardware →
Not sure how to read an insert code? Turning insert designation explained.
Specifications decoded from the RMC toolholder identification system (RMC 2020 catalog, page 2).
