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Amada Model

Amada AC-255NT
Turret Sleeving

Restoring worn upper turret station bores on the AC-255NT to Amada OEM tolerance — on your floor, in 2–3 days, without replacing the turret.

Amada AC-255NT CNC turret punch press
Amada AC-255NT turret punch press.

Amada AC-255NT at a glance

Era
2008
Tonnage
22 ton
Stations
45, 51 or 58
Turret
Thick turret
Auto-Index
4 A/I on the 45 and 51 station turrets; 2 on the 58
Control
Fanuc AMNC NT

The AE line has been in production since 2008. Servo-electric and comparatively efficient, these are current machines where downtime, not machine age, is the deciding cost.

Where this machine is in its life

The AC-255NT is a current-generation machine (2008). If yours is showing turret wear, it is not because the machine is old — it is because it has been working. High-utilisation machines reach the same bore wear in a fraction of the calendar time.

On a machine this current, the dominant cost is not the repair. It is the production you lose while it is out, which is why the work is done on your floor in days rather than the machine going anywhere.

How an AC-255NT turret wears

At 22 tons, the AC-255NT is a lighter, faster machine, and its turret wear pattern reflects that. wear accumulates through sheer cycle volume rather than force per hit. A high-throughput shop can put more hits through a 22-ton machine in a year than a heavy press sees in five.

With 58 stations, work is spread across a wide turret, which is why wear on these machines is so rarely uniform. In practice a handful of stations carry the common tools and wear out well ahead of the rest. Most AC-255NT jobs are partial as a result — the worn stations are sleeved and the sound ones are left alone, which keeps both cost and downtime down.

The tell is always the same: the fault stays with the station rather than following the tool. Move a tool that is producing bad parts to another station — if it runs clean there, the bore is worn, and new tooling will not change that. See holes out of round, burring on punched parts or punches dulling too fast for the full diagnosis.

What sleeving an AC-255NT involves

Each worn bore is machined to a precise oversize and a hardened USA-made steel sleeve is installed with a precision slip fit and secured with retaining compound, restoring the station to Amada factory tolerance — typically within 0.0002″. Engineers travel to you; the AC-255NT never ships. 2–3 days of downtime, typically $8,000–$25,000 depending on scope. After the first install your own maintenance staff can replace sleeves in future.

Set against $100,000–$500,000+ for a replacement machine — see sleeve or replace, including where replacing genuinely wins.

Auto-index on this machine

The AC-255NT carries 4 A/I on the 45 and 51 station turrets; 2 on the 58. Auto-index stations rotate tooling in 0.01° increments through gears, bearings and a rotary encoder mechanism — all in constant motion, all wearing. Symptoms are angular drift, indexing errors, alarm codes and parts punched off-angle.

TSI rebuilds them completely and calibrates before sign-off, routinely in the same visit as sleeving. Auto-index refurbishment · diagnosing angle errors.

Is the AC-255NT a thick or thin turret machine?

The AC-255NT is a thick turret machine. Thick and thin describe the turret, not automatically the tooling — the two are quoted separately, and a machine has to be identified on both counts before sleeves or tooling are ordered.

Tonnage will not tell you either: several 22-ton Amada machines run thick turrets. If you are not certain what your press carries, send us the model and serial number and we will confirm it. See also thick vs thin turret and how Amada model numbers work.

Turret configurations for the AC-255NT

The AC-255NT was not built with one turret. Amada offered more than one layout, so the station count does not follow from the model name — it has to be read off the machine. These are the configurations documented for this model:

StationsAuto-indexTurret styleTurret ØA ½″B 1¼″C 2″D 3½″E 4½″Availability
4542 × B 1¼″2 × C 2″T201, T215, T225, T236Thick—241221245 / 4 AI configuration
5143 x B AI + 1 x C AIThick—241832051 / 4 AI configuration
5822 × B 1¼″T220, T256Thick—361242258 / 2 AI configuration

A–E are Amada tool-station sizes: A ½″, B 1¼″, C 2″, D 3½″, E 4½″. A blank size column means the station and auto-index totals are confirmed but the factory A–E mix is not — we would rather leave it open than guess it.

Confirm before you quote. Because the AC-255NT exists in more than one layout, we verify the turret from the serial number or a photograph before pricing any sleeving. If you send us the serial number we will tell you which of the above you have, and how many stations that means. Send us the serial number.

Station layouts documented for the AC-255NT

The AC-255NT is documented on 3 different turret layouts — which is exactly why the station count has to be read off the machine instead of assumed from the model number. All are drawn below, so you can tell at a glance which one you are looking at.

T349 — size A, 1/2", fixedT129 — size A, 1/2", fixedT331 — size A, 1/2", fixedT248 — size A, 1/2", fixedT208 — size A, 1/2", fixedT309 — size A, 1/2", fixedT239 — size A, 1/2", fixedT313 — size A, 1/2", fixedT345 — size A, 1/2", fixedT266 — size A, 1/2", fixedT230 — size A, 1/2", fixedT203 — size A, 1/2", fixedT212 — size A, 1/2", fixedT372 — size A, 1/2", fixedT111 — size A, 1/2", fixedT143 — size A, 1/2", fixedT271 — size A, 1/2", fixedT367 — size A, 1/2", fixedT165 — size A, 1/2", fixedT170 — size A, 1/2", fixedT244 — size A, 1/2", fixedT107 — size A, 1/2", fixedT340 — size A, 1/2", fixedT102 — size A, 1/2", fixedT147 — size A, 1/2", fixedT304 — size A, 1/2", fixedT134 — size A, 1/2", fixedT217 — size A, 1/2", fixedT138 — size A, 1/2", fixedT318 — size A, 1/2", fixedT354 — size A, 1/2", fixedT336 — size A, 1/2", fixedT116 — size A, 1/2", fixedT152 — size A, 1/2", fixedT235 — size A, 1/2", fixedT253 — size A, 1/2", fixedT333 — size B, 1-1/4", fixedT105 — size B, 1-1/4", fixedT114 — size B, 1-1/4", fixedT351 — size B, 1-1/4", fixedT342 — size B, 1-1/4", fixedT306 — size B, 1-1/4", fixedT168 — size B, 1-1/4", fixedT220 — size B, 1-1/4", auto-indexT315 — size B, 1-1/4", fixedT150 — size B, 1-1/4", fixedT132 — size B, 1-1/4", fixedT141 — size B, 1-1/4", fixedT369 — size B, 1-1/4", fixedT256 — size B, 1-1/4", auto-indexT264 — size C, 2", fixedT246 — size C, 2", fixedT228 — size C, 2", fixedT210 — size C, 2", fixedT255 — size D, 3-1/2", fixedT219 — size D, 3-1/2", fixedT237 — size E, 4-1/2", fixedT201 — size E, 4-1/2", fixed255D141342114228C237E264C315369105246C333201E168150351210C306219D1322202562171162443492482351652531523452391022661703183361072032121292302713402083723133313543043091341381113671471431000 MM DISC58STATIONS2 AUTO-INDEXB 1-1/4 in220, 256
A 1/2 inB 1-1/4 inC 2 inD 3-1/2 inE 4-1/2 inAuto-index white ring
58 station, 2 auto-index
every station numbered, sized and listed
T305 — size A, 1/2", fixedT211 — size A, 1/2", fixedT124 — size A, 1/2", fixedT225 — size A, 1/2", fixedT326 — size A, 1/2", fixedT129 — size A, 1/2", fixedT230 — size A, 1/2", fixedT331 — size A, 1/2", fixedT237 — size A, 1/2", fixedT243 — size A, 1/2", fixedT250 — size A, 1/2", fixedT351 — size A, 1/2", fixedT103 — size A, 1/2", fixedT204 — size A, 1/2", fixedT110 — size A, 1/2", fixedT117 — size A, 1/2", fixedT319 — size A, 1/2", fixedT136 — size A, 1/2", fixedT142 — size A, 1/2", fixedT344 — size A, 1/2", fixedT149 — size A, 1/2", fixedT312 — size A, 1/2", fixedT218 — size A, 1/2", fixedT338 — size A, 1/2", fixedT239 — size B, 1-1/4", auto-indexT201 — size B, 1-1/4", auto-indexT227 — size B, 1-1/4", auto-indexT106 — size B, 1-1/4", fixedT120 — size B, 1-1/4", fixedT122 — size B, 1-1/4", fixedT132 — size B, 1-1/4", fixedT134 — size B, 1-1/4", fixedT348 — size B, 1-1/4", fixedT108 — size B, 1-1/4", fixedT309 — size B, 1-1/4", fixedT113 — size B, 1-1/4", fixedT321 — size B, 1-1/4", fixedT145 — size B, 1-1/4", fixedT346 — size B, 1-1/4", fixedT147 — size B, 1-1/4", fixedT307 — size B, 1-1/4", fixedT314 — size B, 1-1/4", fixedT323 — size B, 1-1/4", fixedT333 — size B, 1-1/4", fixedT335 — size B, 1-1/4", fixedT215 — size C, 2", auto-indexT202 — size C, 2", fixedT228 — size C, 2", fixedT240 — size C, 2", fixedT216 — size D, 3-1/2", fixedT241 — size D, 3-1/2", fixed201202103204305106307108309110211312113314215216D117218319120321122323124225326227228129230331132333134335136237338239240241D14224334414534614734814925035151STATIONS4 AUTO-INDEXB 1-1/4 in201, 227, 239C 2 in215
A 1/2 inB 1-1/4 inC 2 inD 3-1/2 inAuto-index white ring
51 station, 4 auto-index
every station numbered, sized and listed
T344 — size A, 1/2", fixedT243 — size A, 1/2", fixedT323 — size A, 1/2", fixedT142 — size A, 1/2", fixedT222 — size A, 1/2", fixedT121 — size A, 1/2", fixedT335 — size A, 1/2", fixedT133 — size A, 1/2", fixedT234 — size A, 1/2", fixedT213 — size A, 1/2", fixedT112 — size A, 1/2", fixedT314 — size A, 1/2", fixedT107 — size A, 1/2", fixedT208 — size A, 1/2", fixedT309 — size A, 1/2", fixedT330 — size A, 1/2", fixedT128 — size A, 1/2", fixedT229 — size A, 1/2", fixedT238 — size A, 1/2", fixedT318 — size A, 1/2", fixedT339 — size A, 1/2", fixedT137 — size A, 1/2", fixedT217 — size A, 1/2", fixedT116 — size A, 1/2", fixedT236 — size B, 1-1/4", auto-indexT215 — size B, 1-1/4", auto-indexT102 — size B, 1-1/4", fixedT303 — size B, 1-1/4", fixedT104 — size B, 1-1/4", fixedT305 — size B, 1-1/4", fixedT320 — size B, 1-1/4", fixedT341 — size B, 1-1/4", fixedT119 — size B, 1-1/4", fixedT140 — size B, 1-1/4", fixedT110 — size B, 1-1/4", fixedT311 — size B, 1-1/4", fixedT131 — size B, 1-1/4", fixedT332 — size B, 1-1/4", fixedT225 — size C, 2", auto-indexT201 — size C, 2", auto-indexT206 — size C, 2", fixedT226 — size C, 2", fixedT227 — size D, 3-1/2", fixedT245 — size E, 4-1/2", fixedT224 — size E, 4-1/2", fixed225C332131311110215119320236305102140303104341245E226C227D206C224E201C1281122432171421071162381371332292081212222342133233143183093353393443301000 MM DISC45STATIONS4 AUTO-INDEXB 1-1/4 in215, 236C 2 in201, 225
A 1/2 inB 1-1/4 inC 2 inD 3-1/2 inE 4-1/2 inAuto-index white ring
45 station, 4 auto-index
every station numbered, sized and listed

Bore positions, bore sizes and the numbering are read from the Amada factory layout sheet. Stations are grouped, not evenly spaced — that grouping is real, and it is the quickest way to recognise your turret. Follow a link for that turret's full station list.

How the AC-255NT compares

Variant of AE-255NT — that is what sets this machine apart on the spec sheet.

These machines are easy to mix up, and the difference matters when you are quoting a turret job. Against the other AE models we cover:

  • Amada AE-2510NT — stations 45, 51 or 58 · auto-index 4 A/I on the 45 and 51 station turrets; 2 on the 58 · tonnage 22 ton.
  • Amada AE-255NT — stations 45, 51 or 58 · auto-index 4 A/I on the 45 and 51 station turrets; 2 on the 58 · tonnage 22 ton.

Sleeving is the same process across all of them. What changes is scope, and scope follows station count and how hard the machine has been run.

Beyond the turret

The AC-255NT runs the Fanuc AMNC NT control — current-generation, and not usually a candidate for retrofit. Where a machine of this age needs more than turret work, it is normally wear items: X/Y ball screws, LM guide rails, clutch and brake, work holder clamps, guide keys, springs and collars. All covered under complete overhaul, on-site, in the same visit.

Amada AC-255NT documentation

Free. The first few downloads need nothing; after that we ask which machine you are working on. Larger parts lists are scanned documents — worth being on Wi-Fi.

↓ Parts List (PDF)

Every part number in that book is on this site too, section by section: AC-255NT parts list index — 4,228 numbers across 72 sections.

Full libraries: manuals and parts lists.

Free estimate on your AC-255NT

Model, serial number, and what the machine is doing. We will tell you what it needs — and if it does not need us, we will say so.

Estimates within 12 hours. Typically scheduled within 30 days.

Request an Estimate 📞 +1 435-723-5688

Reviewed by Mike Sprehn — Owner, Turret Sleeving International. Mike has been part of turret sleeving from the start and has helped improve both the process and the sleeves themselves. About TSI ›

Last reviewed 2 September 2026

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