Airtac SAIJ125 Adjustable Cylinder SAIJ125AX250-30
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125AX250-30 is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 250mm 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
- Stroke250 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX250-30
The AirTAC SAIJ125X250-30 is a double-acting ISO 15552 profile cylinder featuring a rear stroke adjuster that creates a 220-250 mm usable travel window. Delivering 6136 N of push force at 0.5 MPa, it handles heavy actuation while allowing precise end-position tuning during commissioning. The extruded aluminum barrel includes sensor grooves on both sides for flexible switch placement.
This model uses a SUS420J2 stainless steel rod for improved corrosion resistance and features PT tapered port threads. The rear adjustment screw acts purely as a mechanical stop to fine-tune the retract position without requiring external stops, while the standard air cushions manage end-of-stroke deceleration.
Airtac SAIJ125 Adjustable Cylinder SAIJ125AX250-30 Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125AX250-30 |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 250 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 SAIJ125AX250-30
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×250 | 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 SAIJ125AX250-30 Is Used
Product Changeover
Dial in the 220-250 mm stroke window during format size changes on packaging lines without swapping hardware.
Machine Setup
Fine-tune the exact retract end-position during commissioning to achieve precise mechanical alignment.
Variable End Stops
Adjust the mechanical stop point on the fly for heavy-duty forming or clamping stations requiring 6136 N of force.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX250-30 the Right Cylinder?
Choose this 125 mm bore when a 100 mm cylinder (providing 3927 N push at 0.5 MPa) lacks thrust, but a 160 mm bore (10053 N) is excessive. The 30 mm adjustment window is ideal for applications requiring variable end-stops or product-size changeovers, avoiding the need to physically swap cylinders compared to a fixed-stroke SAI. Remember that the adjuster is a travel stop, not a lock; for load-holding without live air pressure, consider an AirTAC SAIL or BSAI cylinder.
To match this ISO 15552 footprint for a direct replacement, confirm the 125 mm bore, 250 mm stroke, PT port threads, SUS420J2 rod material, and the required mounting style from the available SAIJ set: Basic, FA, LB, TC, FTC, TCM1, or TCM2. Because the stroke is under 300 mm, side-load risks are moderate, but external guides are still recommended for heavy off-center 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 SAIJ125AX250-30 FAQ
At 0.5 MPa operating pressure, this 125 mm bore cylinder provides 6136 N of push force and 5734 N of pull force. It can deliver up to 8590 N push at 0.7 MPa.
The rear adjuster screw allows you to shorten the effective stroke by up to 30 mm, creating a 220-250 mm travel window. It functions as a mechanical stop for position tuning and does not lock the load without live air.
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 SAIJ125AX250-30
Send us the quantity and destination. We confirm price, stock and lead time — usually within 7-8 hours.