Airtac SAIJ125 Adjustable Cylinder SAIJ125X45-40S
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125X45-40S is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 45mm 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
- Stroke45 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125X45-40S
The AirTAC SAIJ125X45-40-S is a double-acting ISO 15552 profile cylinder featuring a rear-mounted stroke adjuster. It delivers substantial thrust, offering 6136N of pull force at 0.5 MPa and 8590N at 0.7 MPa. The built-in rear stopper allows you to fine-tune the effective travel down to a 5-45 mm window, providing precise end-position control without adding external stops.
This 125mm bore unit includes a PT tapered port and a durable carbon steel rod. Equipped with a magnet (-S), it supports AirTAC CMSE reed and DMSE solid-state sensors housed in the dual-side barrel grooves. The rear adjuster acts purely as a travel stop to set deceleration, meaning it will not hold a load without live air pressure.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X45-40S Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X45-40S |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 45 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 SAIJ125X45-40S
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×45 | 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 SAIJ125X45-40S Is Used
Machine Changeover
Dial in the exact 5-45mm travel end-stop instantly when switching product sizes on a packaging line, avoiding mechanical rebuilds.
Press Fit Tuning
Precisely limit the retraction stroke during assembly operations to guarantee consistent insertion depth without external stopper blocks.
End-Position Calibration
Fine-tune the rear travel limit at commissioning to perfectly sync the 6136N pull force motion with adjacent machine logic.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X45-40S the Right Cylinder?
Choose this 125mm adjustable cylinder when your machine setup requires exact end-position tuning during commissioning or product changeovers, avoiding the need to swap out a fixed-stroke SAI cylinder. If your application needs less force, stepping down to a 100mm bore yields 3681N pull at 0.5 MPa, while upgrading to a 160mm bore provides 9425N. For load-holding without continuous air pressure, consider an SAIL or BSAI lock cylinder instead, as the SAIJ adjuster is not a brake.
When replacing an ISO 15552 cylinder, match the 125mm bore, 45mm stroke, 40mm adjustment range, PT port thread, and the -S magnet option. The SAIJ series uses a reduced mounting set including Basic, FA, LB, TC, FTC, TCM1, and TCM2. With a 45mm stroke operating below 300mm, side-load risks are minimal, but the 32mm rod and M27x2 thread provide robust support for the 30-500 mm/s speed range.
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 SAIJ125X45-40S FAQ
This 125mm bore cylinder provides 6136N of pull force and 8590N of push force at 0.7 MPa. It operates at a speed range of 30-500 mm/s.
The rear adjuster screw lets you shorten the 45mm nominal stroke by up to 40mm, creating a 5-45mm usable travel window for precise end-position tuning without replacing the cylinder.
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