Airtac SAIJ125 Adjustable Cylinder SAIJ125AX135-100S
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125AX135-100S is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 135mm 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
- Stroke135 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX135-100S
The AirTAC SAIJ125X135-100-S is a double-acting ISO 15552 profile cylinder equipped with a rear stroke adjuster, providing a usable travel window of 35 to 135 mm. Delivering 6136 N of push force at 0.5 MPa, this 125 mm bore unit handles heavy loads while allowing precise end-position tuning during commissioning without swapping out the cylinder. It features a SUS420J2 stainless steel rod (code A) for enhanced corrosion resistance and includes a magnet for position sensing.
The generous 100 mm adjustment range is perfect for machinery requiring frequent product-size changeovers. You can dial in the exact retract distance on-site, relying on the rear stopper to set the travel limit. The extruded aluminum barrel incorporates sensor grooves on both sides, and the standard PT (tapered) G1/2 port ensures straightforward pneumatic integration.
Airtac SAIJ125 Adjustable Cylinder SAIJ125AX135-100S Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125AX135-100S |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 135 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 SAIJ125AX135-100S
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×135 | 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 SAIJ125AX135-100S Is Used
Product Changeovers
Quickly reconfigure the 35-135 mm travel window on packaging lines to accommodate different carton or product sizes without changing hardware.
Machine Setup
Fine-tune the retract end-position during initial commissioning to achieve precise alignment, avoiding the need for external stopper blocks.
Heavy Forming
Leverage the 6136 N push force at 0.5 MPa for heavy-duty pressing or holding tasks where exact stroke depth must be dialed in on-site.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX135-100S the Right Cylinder?
Choose this 125 mm bore cylinder when your application demands high thrust that smaller bores cannot provide; stepping down to a 100 mm bore would reduce your push force to 3927 N at 0.5 MPa. The adjustable stroke is selected over a fixed SAI model when you need variable end-stops for machine setup or accommodating multiple product sizes on a single line. Since the stroke is 135 mm, standard mounting guidance applies, but always ensure the load is adequately guided to prevent excessive side-loading on the rod.
For a true ISO 15552 replacement match, verify the 125 mm bore, 135 mm stroke, 100 mm adjustment range, PT port thread, and the -S magnet option. Mounting options for this SAIJ series include Basic, FA, LB, TC, FTC, TCM1, and TCM2. Remember that the rear adjuster acts only as a travel stop and does not hold the load without live air; for load-holding without pneumatic pressure, consider an AirTAC SAIL or BSAI cylinder.
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 SAIJ125AX135-100S FAQ
At an operating pressure of 0.5 MPa, this 125 mm bore cylinder generates a push force of 6136 N and a pull force of 5734 N. At 0.7 MPa, the push force increases to 8590 N.
The rear adjuster allows you to shorten the effective stroke by up to 100 mm from the nominal 135 mm, giving an adjustable travel window of 35 to 135 mm. It functions as a mechanical stop to set the end position and is not a lock, meaning the cylinder requires live air to hold its load.
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