Airtac SAIJ125 Adjustable Cylinder SAIJ125X120-40
The AirTAC SAIJ125 Adjustable Cylinder SAIJ125X120-40 is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 120mm stroke, G1/2 air ports and adjustable end cushioning. Its standardized mounting interface makes it interchangeable with other ISO 15552 cylinders at the mounting interface.
- BoreØ125 mm
- Stroke120 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
- No minimum order. A single piece can be ordered.
- Ready in 3–5 business days. That is the time we take to process the order and hand it to the carrier. Transit time after that depends on the destination.
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125X120-40
It features a 125mm bore, a 120mm nominal stroke, and a PT-tapered G1/2 port. The integrated rear adjusting screw allows you to shorten the effective travel by up to 40mm, creating a precise 80-120mm usable stroke window without changing the cylinder itself.
This fine end-position tuning is ideal for machine setup and product changeovers, eliminating the need for external stops. The extruded aluminum barrel includes sensor grooves on both sides, though this configuration omits the magnet, meaning CMSE or DMSE electronic switches cannot be used without adding the -S option. The carbon steel rod and M27x2 thread provide robust durability for heavy loads, while the standard variable air cushions at both ends manage deceleration across the 30-500mm/s speed range.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X120-40 Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X120-40 |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 120 mm |
| Acting type | Double acting |
| Port size | G1/2 |
| Rod thread | M27×2 |
| Fluid | Air (filtered by 40µm element) |
|---|---|
| Operating pressure | 0.15 – 1.0 MPa |
| Proof pressure | 1.5 MPa |
| Temperature | -20 to +70 °C |
| Speed range | 30 – 500 mm/s |
| Cushion | Adjustable, 40 mm |
| Max stroke | Up to 1500 mm |
Specifications follow the official AirTAC SAI series datasheet and ISO 15552 dimensions. Confirm against the product label before installation. Port options: G (BSPP) / NPT.
Theoretical Output Force (Ø125mm)
| Pressure | Push force | Pull force |
|---|---|---|
| 0.5 MPa | 5734 N | 5734 N |
| 0.7 MPa | 8027 N | — |
| Max (@1.0 MPa) | 1169 kgf | |
Double-rod model: the rod passes through the rear cover, so both piston faces lose rod area and push is shown at the annular-area value. Actual usable force is lower than theoretical due to friction and back-pressure. Size with a safety margin.
Model Code: Airtac SAIJ125 Adjustable Cylinder SAIJ125X120-40
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×120 | Stroke length in mm. |
| -S | Optional built-in magnet for sensor position sensing. |
Related SAI-family variants: SAID (double rod), SAIJ (adjustable stroke), SAIL (with lock), SAIF (with valve), BSAI (enclasp / clamp-lock), and SAI-S with built-in magnet. Rod material: carbon steel (blank) / SUS420J2 (A) / SUS304 (B); seals: TPU (blank) / Viton H / NBR N.
Where the Airtac SAIJ125 Adjustable Cylinder SAIJ125X120-40 Is Used
Product Changeover
Dial in the 80-120mm stroke window during format changes on packaging lines, avoiding the need to physically swap cylinders for different package sizes.
Machine Setup
Precisely set the retract end-position at commissioning without bolting on external mechanical stops, streamlining the machine build process.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X120-40 the Right Cylinder?
If you need less force, stepping down to a 100mm bore yields 3927N; if you need more, a 160mm bore provides 10053N. The SAIJ125X120-40 is selected over a fixed-stroke SAI specifically when commissioning requires dialing in the exact retract distance within its 80-120mm window.
Because the nominal stroke is 120mm, an external guide is not strictly required for side-load support, but the robust M27x2 thread helps manage torsional stress. Remember that the rear adjuster acts only as a travel stop, not a lock; the cylinder will not hold its load without live air. For load-holding without pressure, consider an AirTAC SAIL or BSAI cylinder. When replacing an ISO 15552 unit, match the 125mm bore, 120mm stroke, 40mm adjustment, G1/2 port, and mounting set (Basic, FA, LB, TC, FTC, TCM1, TCM2).
Quick checklist
- ✓ Required force at your working pressure
- ✓ Stroke and mounting space
- ✓ Port/thread type (PT/NPT/G)
- ✓ Magnet (-S) for sensors?
- ✓ Side load — consider a guided cylinder
Installation & Maintenance Notes
- check Use clean air filtered to 40µm or finer.
- check Keep within 0.15 – 1.0 MPa operating pressure.
- check Avoid side load on the piston rod.
- check Adjust end cushion screws for smooth stops.
- check Use correct mounting accessory (FA/FB/CA/CB/LB/TC).
- check Installation by qualified personnel per AirTAC docs.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X120-40 FAQ
At 0.9MPa, the push force increases to 11045N.
The rear adjuster screw allows you to shorten the 120mm nominal stroke by up to 40mm, providing an adjustable travel window of 80-120mm. The adjuster acts as a travel stop and does not lock the load without live air pressure.
Authorized Export Seller
Genuine AirTAC parts produced by AirTAC factory.
1-Year Warranty
Covers non-human-caused product damage.
Fast Dispatch
Standard models are processed and dispatched in 3-5 business days.
Fast Reply
Most inquiries answered within 7-8 hours.
Related AirTAC SAI Cylinders
Request a Quote for Airtac SAIJ125 Adjustable Cylinder SAIJ125X120-40
Send us the quantity and destination. We confirm price, stock and lead time — usually within 7-8 hours.