SISTHOL 20-4 — boring bar, 1.25" bar diameter, 1.812" minimum bore, 14.0" overall length. Made in the USA by RMC Tooling.
I.D. Threading & Shallow Grooving For Triangle TNMC Inserts.
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 exact model — not a generic cross-reference. Every one is stocked.
| Insert | TNMC-432 — 1/2" I.C. · 3/16" thick · 1/32" nose radius |
| Insert Torx screw | GTS-2 |
| Torx key | T-20 — Torx Wrench |
| Clamp | CL-7 |
| Clamp screw | XNS-36 |
See all RMC spare parts & hardware →
Not sure how to read an insert code? Turning insert designation explained.
Dimensions as published in the RMC 2020 catalog, page 56.
