Airtac SAIJ125 Adjustable Cylinder SAIJ125AX185-50
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125AX185-50 is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 185mm 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
- Stroke185 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX185-50
The AirTAC SAIJ125X185-50 is a double-acting ISO 15552 profile cylinder equipped with a rear stroke adjuster, delivering 6136N of push force at 0.5 MPa. It features a SUS420J2 stainless steel rod and PT tapered ports. The built-in rear stopper allows you to trim the nominal 185mm travel back by up to 50mm, creating a precise 135-185mm usable window for dialing in end positions.
Because the adjuster acts solely as a mechanical stop and not a lock, live air pressure is required to hold the load. This heavy-duty actuator includes variable air cushions at both ends and operates at speeds of 30-500mm/s. It uses a reduced mounting set of Basic, FA, LB, TC, FTC, TCM1, and TCM2, omitting FB, CA, CB, and CR.
Airtac SAIJ125 Adjustable Cylinder SAIJ125AX185-50 Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125AX185-50 |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 185 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 SAIJ125AX185-50
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×185 | 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 SAIJ125AX185-50 Is Used
Product Size Changeovers
Quickly shift the end-stop within the 135-185mm window when running a new product batch, avoiding mechanical cylinder swaps.
Machine Setup Tuning
Fine-tune the retract position during commissioning to achieve exact alignment without fabricating custom external spacers.
Heavy Forming Operations
Leverage the 6136N push force at 0.5 MPa for pressing or holding heavy components securely in place.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX185-50 the Right Cylinder?
Select this 125mm bore when a 100mm cylinder (providing 3927N push at 0.5 MPa) lacks the necessary thrust, but a 160mm bore is physically too large. The 50mm adjustment range is ideal for product changeovers, letting you shift the end-of-stroke position without swapping the cylinder or adding external stops. For load-holding without continuous air pressure, integrate an external rod lock or look to the SAIL or BSAI series.
When replacing an ISO 15552 cylinder, match the 125mm bore, 185mm stroke, PT port thread, and the chosen mounting hardware. Since the 185mm stroke is relatively short, side-loading is less severe than in long-stroke applications, but the robust 32mm rod still requires an external guide for heavy lateral loads.
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 SAIJ125AX185-50 FAQ
At 0.5 MPa operating pressure, this 125mm bore cylinder provides 6136N of push force and 5734N of pull force. At 0.7 MPa, the push force increases to 8590N.
The rear adjuster screw acts as a mechanical stop that lets you shorten the 185mm nominal stroke by up to 50mm, yielding a usable travel range of 135-185mm. It sets the end position but 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 SAIJ125AX185-50
Send us the quantity and destination. We confirm price, stock and lead time — usually within 7-8 hours.