Airtac SAIJ125 Adjustable Cylinder SAIJ125AX70-20S
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125AX70-20S is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 70mm 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
- Stroke70 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX70-20S
The AirTAC SAIJ125X70-20-S is a double-acting ISO 15552 profile cylinder equipped with a rear stroke adjuster, allowing you to dial back the 70 mm nominal travel by up to 20 mm. This creates a precise 50-70 mm usable stroke window, enabling exact end-position tuning at commissioning without swapping the cylinder or adding external stops. It delivers a robust 6136 N push force at 0.5 MPa, making it suitable for heavy-duty positioning tasks.
This variant features an SUS420J2 stainless steel rod (code A) for enhanced corrosion resistance and includes a magnet (-S) for use with AirTAC CMSE reed and DMSE electronic sensors. The extruded aluminum barrel incorporates sensor grooves on both sides, and fluid control is managed via PT tapered ports sized at G1/2.
Airtac SAIJ125 Adjustable Cylinder SAIJ125AX70-20S Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125AX70-20S |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 70 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 SAIJ125AX70-20S
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×70 | 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 SAIJ125AX70-20S Is Used
Product Size Changeovers
Quickly fine-tune the 50-70 mm travel window during line changeovers to accommodate different product lengths without replacing hardware.
Heavy-Duty Positioning
Leverage the 6136 N push force at 0.5 MPa to move and position heavy pallets or workpieces accurately against the adjustable stop.
Commissioning Calibration
Dial in the exact end-of-stroke position during initial machine setup to prevent overtravel and crush damage to delicate tooling.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX70-20S the Right Cylinder?
Choose this 125 mm bore when a 100 mm cylinder (providing 3927 N push at 0.5 MPa) lacks the necessary thrust, but before stepping up to a 160 mm bore (10053 N push). The adjustable stroke is ideal for machines requiring variable end-stops during product changeovers, whereas a fixed SAI cylinder is better for dedicated, single-purpose setups. Note that the rear adjuster acts only as a travel stop and does not hold the load without live air; for true load-holding, consider an SAIL or BSAI cylinder.
To match this ISO 15552 replacement exactly, confirm the 125 mm bore, 70 mm stroke, 20 mm adjustment, PT G1/2 port, and the -S magnet. The SAIJ mounting set includes Basic, FA, LB, TC, FTC, TCM1, and TCM2 options, 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 SAIJ125AX70-20S 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 reach a maximum push force of 11045 N at 0.9 MPa.
The rear adjuster screw allows you to shorten the 70 mm nominal stroke by up to 20 mm, providing a usable travel window of 50 to 70 mm. The adjuster acts as a mechanical stop to fine-tune the end position and does not lock the load without continuous air pressure.
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