Airtac SAIJ125 Adjustable Cylinder SAIJ125AX30-20S
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125AX30-20S is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 30mm 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
- Stroke30 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX30-20S
The AirTAC SAIJ125X30-20-S is a double-acting ISO 15552 profile cylinder equipped with a rear stroke adjuster. It delivers 6136N of push force at 0.5 MPa and features a 30mm nominal stroke that can be dialed back by up to 20mm, creating a precise 10-30mm usable travel window for commissioning flexibility.
This unit includes a SUS420J2 stainless steel rod for corrosion resistance and a magnet for CMSE reed or DMSE electronic sensors. It uses a PT tapered G1/2 port and omits the FB, CA, CB, and CR mounts, utilizing a focused mounting set of Basic, FA, LB, TC, FTC, TCM1, and TCM2.
Airtac SAIJ125 Adjustable Cylinder SAIJ125AX30-20S Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125AX30-20S |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 30 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 SAIJ125AX30-20S
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×30 | 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 SAIJ125AX30-20S Is Used
Variable End-Stop Tuning
Dial in the exact 10-30mm retract position during machine commissioning to accommodate material thickness variations without swapping hardware.
Product Changeover
Quickly adjust the stroke end-position on a packaging line when switching to a different product size, minimizing downtime.
Short-Stroke Clamping
Leverage the high 6136N force and short travel window to securely hold workpieces in automated machining fixtures.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX30-20S the Right Cylinder?
Select this 125mm bore when an 80mm bore (2513N push at 0.5MPa) lacks sufficient thrust, but you want to avoid stepping up to a 160mm bore (10053N). Choose the SAIJ adjustable-stroke format over a fixed SAI cylinder when you need to fine-tune the retract end-position during machine setup or product changeover without adding external stops.
For replacement, match the 125mm bore, 30mm stroke, 20mm adjustment range, PT port, and -S magnet. The rear adjuster acts only as a travel stop and does not hold loads without live air; for true load-holding, consider an AirTAC SAIL or BSAI series cylinder. With a short 30mm stroke, side-load risks are minimal, but always ensure axial alignment.
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 SAIJ125AX30-20S 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 adjusting screw allows you to shorten the effective stroke by up to 20mm. With the 30mm nominal stroke, this creates an adjustable travel window of 10-30mm to fine-tune the end position without external stops.
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Standard models usually ship in 3-4 days.
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