Airtac SAIJ125 Adjustable Cylinder SAIJ125AX85-30S
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125AX85-30S is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 85mm 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
- Stroke85 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX85-30S
The AirTAC SAIJ125X85-30-S is a double-acting ISO 15552 profile cylinder equipped with a rear stroke adjuster, delivering 6136N of push force at 0.5MPa. Its SUS420J2 stainless steel rod (code A) provides excellent corrosion resistance, while the integrated magnet (-S) enables seamless position detection. By turning the rear screw, you can fine-tune the effective travel within a 55-85mm window without swapping hardware.
This adjustable stopper allows precise end-position tuning during commissioning or product changeovers, eliminating the need for external stops. The cylinder features PT tapered ports and variable air cushions at both ends to decelerate the load smoothly. Note that the adjuster acts only as a travel stop and does not hold the load without live air pressure.
Airtac SAIJ125 Adjustable Cylinder SAIJ125AX85-30S Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125AX85-30S |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 85 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 SAIJ125AX85-30S
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×85 | 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 SAIJ125AX85-30S Is Used
Variable End-Stop Positioning
Dial in the exact 55-85mm travel distance during machine commissioning to accommodate different material thicknesses without adding external physical stops.
Product Size Changeovers
Quickly adjust the rear stroke screw when switching production lines to new product dimensions, reducing downtime and maintaining precise positioning.
Heavy-Duty Forming Setup
Leverage the 6136N push force at 0.5MPa for pressing or forming tasks, using the adjustable stopper to fine-tune the end position for specific batch requirements.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX85-30S the Right Cylinder?
Select this 125mm bore model when an application requires substantial thrust—such as 6136N push or 5734N pull at 0.5MPa—and variable end-stop positioning. If your setup demands less force, stepping down to an 80mm bore yields 2513N push force. Choose the SAIJ adjustable format over a fixed-stroke SAI cylinder when you need to dial in the exact 55-85mm travel window during machine setup. For load-holding without continuous air pressure, consider an AirTAC SAIL or BSAI cylinder instead.
When replacing an ISO 15552 cylinder, match the 125mm bore, 85mm nominal stroke, 30mm adjustment range, PT port threads, and the -S magnet requirement. Mounting options for this profile cylinder include Basic, FA, LB, TC, FTC, TCM1, and TCM2. Because the stroke is under 300mm, side-load concerns are minimal, but always ensure proper alignment to maximize seal life.
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 SAIJ125AX85-30S FAQ
At 0.5MPa operating pressure, this 125mm bore cylinder provides 6136N of push force and 5734N of pull force. At 0.7MPa, the push force increases to 8590N.
The rear adjuster screw allows you to shorten the 85mm nominal stroke by up to 30mm, creating a usable travel window of 55-85mm. This stopper fine-tunes the end position but does not lock the load without live air pressure.
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