Airtac SAIJ125 Adjustable Cylinder SAIJ125X375-40S
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125X375-40S 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 SAIJ125X375-40S
The AirTAC SAIJ125X375-40-S is a double-acting, single-rod ISO 15552 profile cylinder equipped with a rear stroke adjuster. It delivers 6136 N of push force at 0.5 MPa and features a 375 mm nominal stroke that can be fine-tuned down by up to 40 mm, yielding a precise 335-375 mm usable travel window. This built-in adjustability allows you to dial in the retract end position during commissioning without adding external stops.
This -S variant includes a magnet for position sensing and is designed with sensor grooves on both sides of the extruded aluminum barrel to accept AirTAC CMSE reed or DMSE electronic solid-state switches. The 32 mm carbon steel piston rod and M27x2 rod thread provide a robust interface for heavy loads, while the PT tapered port threads ensure a secure pneumatic connection.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X375-40S Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X375-40S |
|---|---|
| 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 SAIJ125X375-40S
| 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 SAIJ125X375-40S Is Used
Product Changeover
Dial in the 335-375 mm retract position on the fly when switching between part sizes on a machining line, avoiding physical cylinder swaps.
Heavy Fixture Clamping
Leverage the 6136 N push force at 0.5 MPa to secure large workpieces, using the rear stop to fine-tune the clamp's exact endpoint.
Automated Press Setup
Set precise bottoming positions for pressing operations during initial commissioning without machining custom external spacers.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X375-40S the Right Cylinder?
Choose this 125 mm bore when an 80 mm cylinder (providing 2513 N push at 0.5 MPa) lacks the thrust for your heavier fixtures, but a 160 mm bore is physically oversized. The adjustable 335-375 mm travel window is ideal for machinery that requires variable end-stops during product changeovers, replacing the need to swap out a fixed-stroke SAI cylinder. Because the 375 mm stroke is relatively long, an external guide should be used to prevent excessive rod side-loading.
When specifying a replacement, verify the 125 mm bore, 375 mm stroke, 40 mm adjustment range, PT G1/2 port, and the -S magnet option. The SAIJ mounting set includes Basic, FA, LB, TC, FTC, TCM1, and TCM2 (omitting FB, CA, CB, and CR). Note that the rear adjuster functions strictly as a travel stop and does not hold the load without live air; for positive load-holding, consider an AirTAC SAIL or BSAI cylinder.
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 SAIJ125X375-40S FAQ
At 0.5 MPa operating pressure, this 125 mm bore cylinder generates 6136 N of push force and 5734 N of pull force. At its maximum 1.0 MPa pressure, it can deliver up to 1251 kgf.
The rear adjuster screw acts as a mechanical stop that lets you shorten the effective stroke from the 375 mm nominal length by up to 40 mm, providing a usable travel window of 335-375 mm. It is a travel stop, not a lock, and the cylinder requires live air to maintain position.
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