Airtac SAIJ125 Adjustable Cylinder SAIJ125X280-100S
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125X280-100S is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 280mm 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
- Stroke280 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125X280-100S
The AirTAC SAIJ125X280-100-S is a double-acting ISO 15552 profile cylinder equipped with a rear mechanical stroke adjuster. It provides a substantial 6136N pull force at 0.5 MPa, featuring a 32mm carbon steel piston rod and PT tapered G1/2 ports. An integrated -S magnet enables position detection with CMSE reed or DMSE solid-state sensors.
This model provides a usable travel window of 180 to 280mm, allowing you to dial back the nominal stroke by up to 100mm. This external stopper mechanism lets you fine-tune end positions at commissioning or during product changeovers without adding external stops. The adjuster acts solely as a travel stop to set deceleration and does not hold the load without live air pressure.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X280-100S Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X280-100S |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 280 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 SAIJ125X280-100S
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×280 | 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 SAIJ125X280-100S Is Used
Variable End Stops
Dial in the exact retract position within the 180-280mm window during machine commissioning without physically swapping the cylinder.
Product Changeover
Quickly adapt the stroke length on a production line when handling different product sizes, using the 100mm rear adjustment range.
Heavy Clamping
Leverage the 6136N pull force for heavy-duty clamping tasks while precisely tuning the travel end to protect tooling.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X280-100S the Right Cylinder?
Choose this 125mm bore when you need heavy force (6136N pull at 0.5MPa) and a wide 180-280mm adjustable travel window for frequent machine setup changes. If your application requires less force, stepping down to a 100mm bore yields 3681N pull, while a 160mm bore offers 9425N pull for heavier loads. Because the stroke is 280mm, ensure proper external guiding to prevent side-loading damage to the rod.
For an exact ISO 15552 replacement, match the 125mm bore, 280mm stroke, 100mm adjustment, PT G1/2 ports, and the -S magnet. The SAIJ mounting set includes Basic, FA, LB, TC, FTC, TCM1, and TCM2, omitting FB, CA, CB, and CR brackets. For load-holding without live pressure, select a SAIL or BSAI series cylinder instead of relying on this adjuster.
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 SAIJ125X280-100S FAQ
The rear adjuster acts as an external stopper that lets you trim the effective travel back by up to 100mm, creating a usable stroke window of 180-280mm. It sets the travel end and deceleration point but does not lock or hold the load without continuous air pressure.
At 0.5 MPa operating pressure, it provides 6136N of push force and 5734N of pull force. At its maximum 1.0 MPa pressure, the push force increases to 11045N.
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Covers non-human-caused product damage.
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Standard models usually ship in 3-4 days.
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