Airtac SAIJ125 Adjustable Cylinder SAIJ125X275-20
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125X275-20 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 SAIJ125X275-20
The AirTAC SAIJ125X275-20 is a double-acting ISO 15552 profile cylinder equipped with a rear stroke adjuster, delivering 6136 N of push force at 0.5 MPa. It features a 32 mm carbon steel rod and PT tapered G1/2 ports. By turning the rear screw, you achieve a usable travel window of 255 to 275 mm, providing exact end-position tuning without external stops.
This extruded aluminum barrel includes sensor grooves on both sides for CMSE reed or DMSE electronic switches. Operating at 30 to 500 mm/s, it utilizes variable air cushions at both ends to decelerate heavy loads. The adjuster functions strictly as a travel stop and does not hold the load without live air pressure.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X275-20 Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X275-20 |
|---|---|
| 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 SAIJ125X275-20
| 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 SAIJ125X275-20 Is Used
Variable End Stops
Dial in the 255 to 275 mm stroke window during commissioning to accommodate varying material thicknesses without machining new hard stops.
Machine Changeover
Quickly reposition the retract endpoint on automated lines handling different product sizes, leveraging 6136 N of thrust at 0.5 MPa.
Heavy Assembly Tuning
Fine-tune the final seating position of heavy components, relying on the 32 mm carbon steel rod to withstand demanding operational stresses.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X275-20 the Right Cylinder?
Choose this 125 mm bore when a 100 mm cylinder (offering 3927 N push at 0.5 MPa) lacks thrust, but a 160 mm bore is physically excessive. The 20 mm adjustment window is ideal for fine-tuning machine setup or product changeover, whereas a fixed SAI cylinder locks you into a single 275 mm endpoint. For an ISO 15552 replacement, match the 275 mm stroke, 20 mm adjuster, G1/2 PT ports, and your required mounting from the SAIJ set: Basic, FA, LB, TC, FTC, TCM1, or TCM2.
Because the stroke exceeds 300 mm, the 32 mm rod and M27x2 thread still require an external guide to manage side loads. Remember that the rear adjuster only sets the travel end; for load-holding without live pressure, use a SAIL lock, BSAI clamp-lock, or external rod lock.
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 SAIJ125X275-20 FAQ
At 0.5 MPa, this 125 mm bore cylinder provides 6136 N of push force and 5734 N of pull force. If you increase the pressure to 0.7 MPa, the push force rises to 8590 N.
The rear adjuster acts as a stopper that lets you shorten the nominal 275 mm stroke by up to 20 mm, creating a 255 to 275 mm travel window. It sets the end position but does not lock the load without continuous air pressure.
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