Airtac SAIJ125 Adjustable Cylinder SAIJ125X135-30S
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125X135-30S 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 SAIJ125X135-30S
The AirTAC SAIJ125X135-30-S is a double-acting ISO 15552 profile cylinder equipped with a rear stroke adjuster, delivering 6136N of push force at 0.5 MPa. The integrated -S magnet enables position sensing with AirTAC CMSE reed or DMSE electronic switches. By turning the rear screw, you achieve a usable travel window of 105-135mm, allowing precise end-position tuning without external stops.
This bore features a robust 32mm carbon steel rod with an M27x2 thread, paired with 40mm cushioning to manage heavy kinetic energy. Fluid compatibility relies on 40um filtered air, operating between 0.15 and 1.0 MPa. The extruded aluminum barrel includes sensor grooves on both sides for flexible switch mounting.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X135-30S Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X135-30S |
|---|---|
| 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 SAIJ125X135-30S
| 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 SAIJ125X135-30S Is Used
Variable End-Stop Tuning
Dial in the exact 105-135mm retraction point during machine commissioning to accommodate different material thicknesses without swapping cylinders.
Product Size Changeover
Quickly adjust the stroke window on packaging lines when switching between container sizes, leveraging the 6136N thrust for heavy actuation.
Heavy Clamping Setup
Fine-tune the clamping end-position on large fixtures, using the 32mm carbon steel rod to absorb significant side loads during manufacturing.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X135-30S the Right Cylinder?
Select this 125mm bore when an 80mm cylinder (2513N push at 0.5 MPa) lacks thrust, but a 160mm bore (10053N) is physically excessive. The adjustable 105-135mm stroke window is ideal for product changeovers where exact end-stops vary. Mounting options include Basic, FA, LB, TC, FTC, TCM1, and TCM2, omitting FB, CA, CB, and CR.
Because the 135mm stroke is relatively short for this large bore, side-load risks are minimal, but always guide the load rigidly. The rear adjuster sets the travel end but does not hold the load without live air; for true pneumatic locking, consider SAIL or BSAI types. This SKU uses PT tapered ports and operates at speeds of 30-500mm/s.
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 SAIJ125X135-30S FAQ
At 0.5 MPa, this 125mm bore cylinder provides 6136N of push force and 5734N of pull force. At the maximum operating pressure of 0.9 MPa, the push force increases to 11045N.
The rear adjuster screw acts as a mechanical stop, allowing you to trim the effective stroke back by up to 30mm. This creates a usable travel window of 105-135mm from the 135mm nominal stroke, enabling fine-tuning without adding external stops.
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