Airtac SAIJ125 Adjustable Cylinder SAIJ125X45-40S
The 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 interchangeable with other ISO 15552 cylinders at the mounting interface.
- BoreØ125 mm
- Stroke45 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 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 | 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 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
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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Covers non-human-caused product damage.
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Standard models are processed and dispatched in 3-5 business days.
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