Airtac SAIJ125 Adjustable Cylinder SAIJ125AX375-50
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125AX375-50 is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 375mm 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
- Stroke375 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX375-50
The AirTAC SAIJ125X375-50 is a double-acting ISO 15552 profile cylinder engineered with a rear stroke adjuster, delivering a practical 325-375 mm usable travel window from its 375 mm nominal stroke. Operating at 0.5 MPa, it generates 6136 N of push force and 5734 N of pull force, making it ideal for heavy-duty positioning. This configuration features a SUS420J2 stainless steel piston rod (option A) for enhanced corrosion resistance and utilizes PT tapered port threads.
The integrated rear adjusting screw acts as a mechanical stop to fine-tune end positions during commissioning without adding external stops. Because this is a 375 mm stroke, the 32 mm rod diameter provides robust support, though an external guide is recommended for heavy loads. The adjuster and variable air cushions control travel ends but do not hold the load without live air; for dead-load holding, consider the SAIL or BSAI series.
Airtac SAIJ125 Adjustable Cylinder SAIJ125AX375-50 Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125AX375-50 |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 375 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 SAIJ125AX375-50
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×375 | 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 SAIJ125AX375-50 Is Used
Product Size Changeovers
Leverage the 50 mm rear adjustment window to rapidly switch end-stops for varying product lengths on an automated line without physically swapping cylinders.
Heavy-Duty Positioning
Utilize the 6136 N push force at 0.5 MPa to move and position heavy pallets or fixtures, using the fine-tune adjuster to dial in the exact final stop.
Machine Commissioning
Trim the effective stroke back from 375 mm to 325 mm during setup to perfectly time machine sequencing without adding bulky external mechanical stops.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX375-50 the Right Cylinder?
Choose this 125 mm bore when a 100 mm bore (offering 3927 N push at 0.5 MPa) lacks the thrust for your heavy product changeovers, but a 160 mm bore (10053 N push) is physically oversized. The 50 mm adjustment range is selected when you need significant end-position flexibility across varying product sizes on the same line, unlike a fixed-stroke SAI cylinder. As a true ISO 15552 profile cylinder, it is dimensionally interchangeable with standard ISO 15552 mounting interfaces.
To match this exact configuration, specify a 125 mm bore, 375 mm stroke, 50 mm adjustment, PT tapered ports, SUS420J2 rod material, and no magnet. The mounting set is limited to Basic, FA, LB, TC, FTC, TCM1, and TCM2 (omitting FB, CA, CB, and CR). Operating speed is capped at 30-500 mm/s for this large bore.
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 SAIJ125AX375-50 FAQ
It features a rear adjusting screw that acts as a mechanical stop, allowing you to shorten the effective stroke by up to 50 mm. This creates a 325-375 mm usable travel window for fine-tuning end positions at commissioning.
At an operating pressure of 0.5 MPa, the SAIJ125X375-50 provides 6136 N of push force and 5734 N of pull force. It can deliver up to 11045 N of push force at 0.9 MPa.
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