Airtac SAIJ125 Adjustable Cylinder SAIJ125AX35-20
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125AX35-20 is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 35mm 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
- Stroke35 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX35-20
The AirTAC SAIJ125X35-20 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 a PT tapered port. By turning the external rear screw, you can trim the nominal 35 mm stroke back by up to 20 mm, creating a precise 15-35 mm usable travel window for exact end-position tuning during commissioning.
This adjustable stopper lets you fine-tune the retract end on product changeovers without swapping the cylinder or bolting on external stops. The rear adjuster acts purely as a travel stop and works alongside the variable air cushions at both ends; it does not hold the load without live air. For true load-holding without pneumatic pressure, consider the SAIL or BSAI series.
Airtac SAIJ125 Adjustable Cylinder SAIJ125AX35-20 Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125AX35-20 |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 35 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 SAIJ125AX35-20
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×35 | 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 SAIJ125AX35-20 Is Used
Precision Pressing
Dial in the exact 15-35 mm travel window during machine setup to achieve perfect pressing depth on delicate components without adding external stoppers.
Product Changeover
Quickly adjust the retract end-stop on the fly when switching between product sizes on a production line, saving hours of mechanical retooling.
Heavy Clamping
Leverage the 6136N push force at 0.5 MPa for heavy-duty clamping tasks while retaining the ability to fine-tune the clamping distance.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX35-20 the Right Cylinder?
Choose this 125 mm bore when you need heavy thrust in the 6000N range but require minute end-position adjustments within a short 15-35 mm travel window. If your application needs less force, stepping down to an 80 mm bore yields 2513N at 0.5 MPa, whereas moving up to a 160 mm bore provides 10053N. The adjustable stroke is ideal for variable end-stops and machine setup, unlike a fixed-stroke SAI cylinder.
To match this exact configuration for an ISO 15552 replacement, specify the 125 mm bore, 35 mm stroke, 20 mm adjustment, PT port thread, Basic/FA/LB/TC/FTC/TCM1/TCM2 mounting, and no magnet. Because the stroke is short, side-load risks are minimal, but always ensure the load is guided to prevent rod binding.
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 SAIJ125AX35-20 FAQ
At 0.5 MPa operating pressure, this 125 mm bore cylinder generates a push force of 6139N and a pull force of 5734N. It can reach a maximum push force of 1251 kgf at 1.0 MPa.
The rear adjuster screw allows you to shorten the nominal 35 mm stroke by up to 20 mm, providing a usable travel window of 15-35 mm. This enables fine-tuning of the end position at commissioning without replacing the cylinder.
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