Airtac SAIJ125 Adjustable Cylinder SAIJ125AX155-40S
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125AX155-40S is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 155mm stroke, G1/2 air ports and adjustable end cushioning. Its standardized mounting interface makes it a drop-in replacement for other ISO 15552 cylinders in automation lines.
- BoreØ125 mm
- Stroke155 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX155-40S
The AirTAC SAIJ125X155-40-S is a double-acting ISO 15552 profile cylinder equipped with a rear stroke adjuster, allowing you to dial back the 155 mm nominal stroke by up to 40 mm. This creates a precise 115-155 mm usable travel window, ideal for fine-tuning end positions during commissioning without swapping hardware. It delivers a substantial 8590 N push force at 0.7 MPa.
This variant features a SUS420J2 stainless steel rod (code A) for enhanced corrosion resistance and includes a built-in magnet for position sensing. It operates at 30-500 mm/s and uses a PT G1/2 port. The extruded aluminum barrel provides sensor grooves on both sides, and the mounting interface supports Basic, FA, LB, TC, FTC, TCM1, and TCM2 options.
Airtac SAIJ125 Adjustable Cylinder SAIJ125AX155-40S Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125AX155-40S |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 155 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 | 6136 N | 5734 N |
| 0.7 MPa | 8590 N | — |
| Max (@1.0 MPa) | 1251 kgf | |
Actual usable force is lower than theoretical due to friction and back-pressure. Size with a safety margin.
Model Code: Airtac SAIJ125 Adjustable Cylinder SAIJ125AX155-40S
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×155 | 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 SAIJ125AX155-40S Is Used
Product Changeovers
Dial in the 115-155 mm travel window on the fly to accommodate different product lengths on a packaging line without changing the cylinder.
Machine Setup
Use the rear stopper to precisely set the end position during initial commissioning, avoiding the need for external shims or spacers.
High-Force Positioning
Leverage the 8590 N push force at 0.7 MPa to move heavy jigs while fine-tuning the retract distance to meet exact tooling clearances.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX155-40S the Right Cylinder?
Select this 125 mm bore when an application requires high thrust—such as 8590 N at 0.7 MPa—that exceeds the 5497 N push force of a 100 mm bore, but does not warrant the extreme 14074 N output of a 160 mm cylinder. The adjustable stroke is chosen over a fixed SAI model when machine setups require variable end-stops or product-size changeovers, letting you trim the retract position mechanically. Because the stroke is 155 mm, standard mounting is generally acceptable, but always ensure external guides support the load if side forces are present.
Remember that the rear adjuster acts purely as a travel stop and the air cushions handle deceleration; neither will hold a load without live air pressure. For load-holding requirements without continuous air, consider an external pilot-operated check valve or AirTAC SAIL and BSAI locking cylinders. When replacing an ISO 15552 cylinder, match the 125 mm bore, 155 mm stroke, 40 mm adjustment, PT G1/2 port, and the -S magnet requirement.
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 SAIJ125AX155-40S FAQ
At 0.7 MPa operating pressure, this 125 mm bore cylinder provides a push force of 8590 N and a pull force of 5734 N. At 0.9 MPa, the push force increases to 11045 N.
The rear adjuster allows you to shorten the effective stroke by up to 40 mm from the 155 mm nominal length, providing a usable travel window of 115-155 mm. It functions as a mechanical 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 usually ship in 3-4 days.
Fast Reply
Most inquiries answered within 7-8 hours.
Related AirTAC SAI Cylinders
Request a Quote for Airtac SAIJ125 Adjustable Cylinder SAIJ125AX155-40S
Send us the quantity and destination. We confirm price, stock and lead time — usually within 7-8 hours.