Airtac SAIJ125 Adjustable Cylinder SAIJ125X275-10
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125X275-10 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 SAIJ125X275-10
The AirTAC SAIJ125X275-10 is a double-acting ISO 15552 profile cylinder featuring a rear-mounted stroke adjuster that allows you to fine-tune the effective travel window down to 265-275 mm without external stops. Equipped with a robust 32 mm carbon steel rod and M27x2 thread, it delivers substantial thrust, pushing 6136 N and pulling 5734 N at 0.5 MPa. The extruded aluminum barrel includes sensor grooves on both sides for flexible switch mounting.
This model utilizes a PT tapered G1/2 port and variable air cushions at both ends to manage deceleration. The rear adjuster acts purely as a travel stop to set the exact retract end-position during commissioning, meaning it will not hold a load without continuous air pressure. For load-holding requirements, exploring the SAIL or BSAI series is recommended.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X275-10 Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X275-10 |
|---|---|
| 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 SAIJ125X275-10
| 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 SAIJ125X275-10 Is Used
Variable End-Stop Tuning
Dial in the exact retract position within the 265-275 mm window during machine commissioning to accommodate minor mechanical variations without adding external shims.
Product Size Changeovers
Rapidly adjust the stroke length on packaging lines when transitioning between different product sizes, minimizing downtime and physical cylinder swaps.
Clamping Force Positioning
Set a precise end-stop for heavy clamping tasks, ensuring the 6136 N thrust is applied at the exact required depth before the cushioning takes over.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X275-10 the Right Cylinder?
Choose this 125 mm bore when 80 mm (2513 N push at 0.5 MPa) is insufficient but you want to avoid stepping up to a 160 mm body. The 10 mm adjustment range is ideal for precisely dialing in end-stops during product changeovers rather than machining custom spacers or swapping a fixed-stroke SAI cylinder. To match this ISO 15552 footprint exactly, specify a 125 mm bore, 275 mm stroke, PT G1/2 port, and the Basic, FA, LB, TC, FTC, TCM1, or TCM2 mounting style. Because the stroke is 275 mm, ensure proper external guiding to prevent excessive side-loading on the rod.
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 SAIJ125X275-10 FAQ
At 0.5 MPa operating pressure, this 125 mm bore cylinder provides 6136 N of push force and 5734 N of pull force. It operates at a speed range of 30-500 mm/s.
The rear adjuster screw acts as a mechanical stop that lets you shorten the nominal 275 mm stroke by up to 10 mm, providing a usable travel window of 265-275 mm. It only sets the end position and does not lock or hold the load without live air pressure.
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