Airtac SAIJ125 Adjustable Cylinder SAIJ125X50-50S
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125X50-50S is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 50mm 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
- Stroke50 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125X50-50S
The AirTAC SAIJ125X50-50-S is a double-acting ISO 15552 profile cylinder equipped with a rear stroke adjuster, delivering 6136N of push force at 0.5 MPa. Because this specific SKU carries a 50 mm adjustment code on a 50 mm nominal stroke, it yields a highly versatile 0 to 50 mm usable travel window. This allows operators to dial the extension down to a near-zero position without swapping hardware.
The extruded aluminum barrel features sensor grooves on both sides, and the included magnet (-S) interfaces directly with AirTAC CMSE reed and DMSE electronic solid-state switches. It uses a 32 mm carbon steel rod with an M27x2 thread and PT tapered ports. The rear stopper fine-tunes the end position, though it acts only as a travel stop and does not hold the load without live air pressure.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X50-50S Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X50-50S |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 50 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 SAIJ125X50-50S
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×50 | 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 SAIJ125X50-50S Is Used
Product Size Changeovers
Quickly reconfigure the extension length from 0 to 50 mm on packaging lines handling varying container sizes without changing the cylinder.
Exact End-Position Setup
Fine-tune the clamping reach during machine commissioning to prevent over-travel on delicate workpieces using the rear stopper.
Heavy Forming Stops
Leverage the 6136N force capacity for pressing operations while setting a precise mechanical stop to control the working depth.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X50-50S the Right Cylinder?
Selecting this 125 mm bore cylinder makes sense when an application requires substantial force—such as the 6136N push at 0.5 MPa—but also demands frequent product changeovers. If you need less force, stepping down to an 80 mm bore yields 2513N. The adjustable stroke is chosen over a fixed SAI cylinder when exact end-position tuning at commissioning is required, avoiding the need to bolt on external stops. For load-holding without continuous air pressure, consider the SAIL or BSAI series, as the SAIJ adjuster is not a lock.
To match this cylinder for an ISO 15552 replacement, specify the 125 mm bore, 50 mm stroke, 50 mm adjustment, PT port thread, and the -S magnet. The mounting options include Basic, FA, LB, TC, FTC, TCM1, and TCM2. Operating speed for this bore size ranges from 30 to 500 mm/s.
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 SAIJ125X50-50S FAQ
The rear adjuster acts as a mechanical stop that lets you trim the effective travel down from the 50 mm nominal stroke, providing a usable window of 0 to 50 mm. It sets the end position but does not lock the load without live air.
At 0.5 MPa it provides 6136N of push force and 5734N of pull force. At 0.7 MPa the push force increases to 8590N.
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 SAIJ125X50-50S
Send us the quantity and destination. We confirm price, stock and lead time — usually within 7-8 hours.