Airtac SAIJ125 Adjustable Cylinder SAIJ125X55-50
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125X55-50 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 SAIJ125X55-50
The AirTAC SAIJ125X55-50 is a double-acting, single-rod ISO 15552 profile cylinder featuring a rear-mounted stroke adjuster. It provides a robust 6136N push force at 0.5 MPa and utilizes a 32mm carbon steel rod with an M27x2 thread to handle high side loads. The extruded aluminum barrel includes sensor grooves on both sides for flexible mounting of CMSE reed or DMSE electronic switches.
This specific SKU allows you to trim the nominal 55mm stroke back by up to 50mm, creating a highly versatile 5-55mm usable travel window. This built-in adjuster acts purely as a mechanical stop to fine-tune the retract end position during commissioning or product changeovers, eliminating the need to physically swap out the cylinder for varying part sizes.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X55-50 Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X55-50 |
|---|---|
| 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 SAIJ125X55-50
| 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 SAIJ125X55-50 Is Used
Variable End-Stop Tuning
Dial in the exact retract distance between 5 and 55mm during machine setup without disassembling the line or adding external physical stops.
Product Size Changeovers
Quickly adapt automated handling equipment to accommodate new product lengths or widths by turning the rear adjustment screw.
Commissioning Calibration
Fine-tune the final end position during initial equipment commissioning to perfect timing and mechanical synchronization.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X55-50 the Right Cylinder?
Selecting this 125mm bore model is ideal when your application requires substantial thrust, such as 6136N push and 5734N pull at 0.5 MPa, but the exact end-of-stroke position fluctuates between production runs. If your process needs less force, stepping down to an 80mm bore yields 2513N push, whereas upgrading to a 160mm bore provides 10053N. Because the stroke is 55mm, you do not need external rod guides for side-load support, but you must ensure the load is not held pneumatically without live air pressure.
The rear stopper is strictly a travel limiter, not a locking mechanism, so it cannot hold a suspended load safely without continuous air pressure. For applications requiring true fail-safe load holding, consider the SAIL air-released lock or BSAI clamp-lock series. To directly replace this unit with a fixed-stroke ISO 15552 cylinder, match the 125mm bore, 55mm stroke, PT G1/2 port, and the Basic, FA, LB, TC, FTC, TCM1, or TCM2 mounting interface.
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 SAIJ125X55-50 FAQ
The rear adjuster allows you to shorten the effective stroke by up to 50mm from the nominal 55mm, giving an actual usable travel window of 5-55mm. It acts as an external mechanical stop that decelerates the piston at the retract end, rather than changing the cylinder's internal cushioning.
At an operating pressure of 0.5 MPa, the SAIJ125X55-50 provides 6136N of push force and 5734N of pull force. At the maximum rated pressure of 1.0 MPa, it can generate up to 1251 kgf of push force.
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