Airtac SAIJ125 Adjustable Cylinder SAIJ125AX275-30S
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125AX275-30S is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 275mm 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
- Stroke275 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX275-30S
The AirTAC SAIJ125X275-30-S is a double-acting ISO 15552 profile cylinder equipped with a rear stroke adjuster. It delivers 6136N of pull force at 0.5 MPa and features a 275 mm nominal stroke that can be dialed back by up to 30 mm, yielding a usable 245-275 mm travel window for precise end-position tuning. The SUS420J2 stainless steel rod offers high corrosion resistance, and the built-in magnet supports CMSE reed and DMSE electronic sensors for position feedback.
Because the stroke exceeds 300 mm is not reached here, standard mounting guidance applies, but the M27x2 rod thread handles substantial side loads. The rear adjuster acts strictly as a travel stop to set deceleration, not as a lock. For load-holding without live air pressure, you must use an external rod lock or pilot-operated check valve. Mounting options include Basic, FA, LB, TC, FTC, TCM1, and TCM2.
Airtac SAIJ125 Adjustable Cylinder SAIJ125AX275-30S Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125AX275-30S |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 275 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 SAIJ125AX275-30S
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×275 | 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 SAIJ125AX275-30S Is Used
Machine Setup Commissioning
Dial in the exact 245-275 mm retract position during initial machine commissioning without swapping out the entire cylinder.
Product Size Changeover
Quickly adjust the end-stop by up to 30 mm on automated lines when processing different product lengths or formats.
Heavy Assembly Presses
Leverage 6136N pull force at 0.5 MPa to secure heavy components while using the rear stop to prevent overtravel.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX275-30S the Right Cylinder?
Select this 125 mm bore when a 63 mm bore (providing 1402N pull at 0.5 MPa) is insufficient, but a 160 mm bore (9425N pull) would overdrive your load. The adjustable 245-275 mm window is chosen over a fixed-stroke SAI cylinder when you need to fine-tune the retract end during commissioning or product changeovers without adding external stops. To match this ISO 15552 replacement, specify the 125 mm bore, 275 mm stroke, 30 mm adjustment, PT tapered port thread, and the -S magnet option.
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 SAIJ125AX275-30S FAQ
At 0.5 MPa it provides 6136N of pull force and 8590N at 0.7 MPa. The maximum push force is 11045N at 0.9 MPa.
The rear adjuster lets you shorten the 275 mm nominal stroke by up to 30 mm, creating a 245-275 mm travel window. It functions as a travel stop and does not hold the load without live air.
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