Airtac SAIJ125 Adjustable Cylinder SAIJ125AX140-30S
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125AX140-30S is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 140mm 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
- Stroke140 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX140-30S
The AirTAC SAIJ125X140-30-S is a double-acting ISO 15552 profile cylinder equipped with a rear stroke adjuster, allowing you to dial back the 140 mm nominal travel to a precise 110-140 mm window during commissioning. It delivers 6136 N of push force at 0.5 MPa, making it robust enough for heavy product-forming tasks. The extruded aluminum barrel features sensor grooves on both sides, and because this unit includes a magnet (-S), it directly supports AirTAC CMSE reed and DMSE solid-state switches for end-of-stroke confirmation.
This model features a SUS420J2 stainless steel rod (option A) for superior corrosion resistance and uses PT tapered port threads. The rear adjuster acts purely as a mechanical stop to fine-tune the end position without swapping cylinders, but it does not hold the load without live air pressure. For load-holding requirements, consider the SAIL or BSAI series instead.
Airtac SAIJ125 Adjustable Cylinder SAIJ125AX140-30S Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125AX140-30S |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 140 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 SAIJ125AX140-30S
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×140 | 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 SAIJ125AX140-30S Is Used
Variable End-Stop Tuning
Dial in the exact retract position within the 110-140 mm window during machine commissioning to accommodate new product dimensions without machining new hard stops.
Product Changeover Setup
Quickly adjust the rear mechanical stop on the assembly line when switching between different thicknesses of materials, saving changeover downtime.
Heavy Forming Operations
Leverage the 6136 N push force at 0.5 MPa to execute robust pressing or clamping actions where the final position needs micro-adjustments.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX140-30S the Right Cylinder?
Choose this 125 mm bore when a 100 mm cylinder (providing 3927 N push force at 0.5 MPa) is insufficient for your tooling weight, but a 160 mm bore (10053 N at 0.5 MPa) would be physical overkill. The adjustable 30 mm end-stop is highly beneficial for production lines that handle varying product sizes, letting operators change the retract distance on the fly without adding external stopper blocks. It uses a G1/2 port and operates at speeds between 30-500 mm/s.
When replacing an ISO 15552 cylinder, match the 125 mm bore, 140 mm stroke, 30 mm adjustment range, PT port thread, and -S magnet. The SAIJ mounting set includes Basic, FA, LB, TC, FTC, TCM1, and TCM2 options, deliberately omitting FB, CA, CB, and CR brackets. Since this is a profile cylinder rather than a tie-rod design, it offers a clean exterior while remaining dimensionally interchangeable per ISO 15552.
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 SAIJ125AX140-30S FAQ
At 0.5 MPa operating pressure, it provides 6136 N of push force and 5734 N of pull force. The maximum operating pressure is 1.0 MPa, and the standard speed range for this 125 mm bore is 30-500 mm/s.
The rear adjusting screw acts as a mechanical stopper, allowing you to shorten the effective travel from 140 mm down to 110 mm. This stopper only sets the end position and deceleration; it does not lock or hold the load without continuous live air pressure.
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