Airtac SAIJ125 Adjustable Cylinder SAIJ125AX550-50S
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125AX550-50S is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 550mm 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
- Stroke550 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX550-50S
The AirTAC SAIJ125X550-50-S is a double-acting ISO 15552 profile cylinder equipped with a rear stroke adjuster, providing a usable travel window of 500 to 550 mm. It delivers 6136 N of push force at 0.5 MPa, making it suited for heavy-duty positioning tasks. The barrel features sensor grooves on both sides, and with the built-in magnet (-S), it integrates seamlessly with AirTAC CMSE reed and DMSE solid-state switches for precise end-of-stroke detection.
This model features a SUS420J2 stainless steel rod (code A) for enhanced corrosion resistance and PT tapered port threads. The rear adjuster acts as a travel stop to fine-tune the end position during commissioning without adding external stops. It is not a lock; the cylinder cannot hold a load without live air pressure. For load-holding requirements, consider the SAIL or BSAI series.
Airtac SAIJ125 Adjustable Cylinder SAIJ125AX550-50S Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125AX550-50S |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 550 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 SAIJ125AX550-50S
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×550 | 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 SAIJ125AX550-50S Is Used
Product Changeover Stops
Dial in the 500-550 mm travel window during line changeovers to accommodate different product lengths without swapping cylinders.
Heavy Press Tuning
Leverage the 6136 N push force at 0.5 MPa to set precise bottoming positions for heavy pressing or forming operations.
Large Assembly Positioning
Use the robust 32 mm SUS420J2 rod and rear stopper to fine-tune the final resting position of large automotive or industrial assemblies.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX550-50S the Right Cylinder?
Choose this adjustable-stroke cylinder when a machine setup requires dialing in a precise end-of-stroke position within a 500-550 mm window during product changeovers. If your application requires less force, stepping down to an 80 mm bore yields 2513 N at 0.5 MPa. If you need fixed travel without an adjuster, the standard SAI series is a simpler alternative.
When replacing an ISO 15552 cylinder, match the 125 mm bore, 550 mm nominal stroke, 50 mm adjustment range, G3/8 port, and the -S magnet. Because the stroke is 550 mm, the 32 mm rod diameter carries a higher side-load capacity, though an external guide is still recommended for long unsupported loads. The SAIJ mounting set includes Basic, FA, LB, TC, FTC, TCM1, and TCM2, omitting FB, CA, CB, and CR.
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 SAIJ125AX550-50S FAQ
At 0.5 MPa operating pressure, this 125 mm bore cylinder provides 6136 N of push force and 5734 N of pull force. At 0.9 MPa, the push force increases to 11045 N.
The rear adjuster screw acts as a mechanical stop, allowing you to shorten the effective travel from 550 mm down to 500 mm. This end-position tuning happens at commissioning without swapping the cylinder, but it 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 SAIJ125AX550-50S
Send us the quantity and destination. We confirm price, stock and lead time — usually within 7-8 hours.