Airtac SAIJ125 Adjustable Cylinder SAIJ125X55-10S
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125X55-10S is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 55mm 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
- Stroke55 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125X55-10S
The AirTAC SAIJ125X55-10-S is a double-acting ISO 15552 profile cylinder featuring a rear stroke adjuster that trims the effective travel. With a 55 mm nominal stroke and a 10 mm adjustment range, it provides a precise 45-55 mm usable travel window for fine-tuning end positions at commissioning. It delivers 6136 N of push force at 0.5 MPa, making it suited for heavy-duty positioning.
This variant includes a magnet for position sensing with CMSE reed or DMSE electronic switches. It uses PT tapered ports and a carbon steel rod. The adjuster acts strictly as a mechanical stop to set the retract position and does not hold the load without live air pressure.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X55-10S Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X55-10S |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 55 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 SAIJ125X55-10S
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×55 | 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 SAIJ125X55-10S Is Used
Heavy Pressing
Dial in the exact 45-55 mm travel needed for heavy pressing and clamping tasks during initial machine commissioning.
Product Changeover
Quickly adjust the retract stop to accommodate different product sizes on a production line without changing the cylinder.
End-Stop Tuning
Fine-tune the end-of-stroke position to perfect mechanical alignment in automated assembly machinery.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X55-10S the Right Cylinder?
Choose this 125 mm bore when your application requires substantial force, stepping up from a 100 mm bore that yields 3927 N at 0.5 MPa. The adjustable stroke is ideal for machine setups requiring variable end-stops or product changeovers, avoiding the need to swap a fixed-stroke SAI cylinder. For load-holding without continuous air pressure, consider an SAIL or BSAI cylinder instead, as this adjuster is not a locking mechanism.
When replacing an ISO 15552 cylinder, match the 125 mm bore, 55 mm stroke, 10 mm adjustment, PT port, and the -S magnet option. The SAIJ mounting set includes Basic, FA, LB, TC, FTC, TCM1, and TCM2 options.
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 SAIJ125X55-10S 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 can deliver up to 11045 N push force at 0.9 MPa.
The rear adjuster screw allows you to shorten the 55 mm nominal stroke by up to 10 mm, creating a usable travel window of 45-55 mm. This enables precise end-position tuning without adding external stops.
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