Airtac SAIJ125 Adjustable Cylinder SAIJ125X260-50
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125X260-50 is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 260mm 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
- Stroke260 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125X260-50
The AirTAC SAIJ125X260-50 is a double-acting, single-rod ISO 15552 profile cylinder engineered for high-force applications requiring precise end-position tuning. Equipped with a 125mm bore, it generates 6136N of push force at 0.5 MPa and up to 11045N at 0.9 MPa. The integrated rear adjusting screw allows you to trim the effective travel back by up to 50mm, creating a 210-260mm usable stroke window without swapping hardware.
This model features a robust 32mm carbon steel rod with an M27x2 thread, paired with 40mm variable air cushions at both ends to absorb kinetic energy. It uses a PT tapered G1/2 port and operates at speeds between 30-500mm/s. The extruded aluminum barrel includes sensor grooves on both sides, allowing you to add CMSE reed or DMSE electronic switches for position feedback.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X260-50 Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X260-50 |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 260 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 SAIJ125X260-50
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×260 | 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 SAIJ125X260-50 Is Used
Product Size Changeovers
Quickly dial in the 210-260mm stroke window during format changes on packaging lines, using the rear screw to set new retraction limits without replacing the cylinder.
High-Force Positioning
Leverage the 11045N push force at 0.9 MPa to move heavy jigs or molds into exact alignment, relying on the 32mm carbon steel rod to handle substantial loads.
Commissioning End-Stops
Fine-tune the end-of-stroke position during initial machine setup, using the 50mm adjustment range to perfect timing before locking down the sequence.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X260-50 the Right Cylinder?
Select this 125mm bore cylinder when a 100mm bore (offering 3927N push at 0.5 MPa) lacks the necessary thrust, but a 160mm bore is physically oversized. The 50mm rear adjuster is ideal for fine-tuning the retraction point during commissioning or adapting to new product sizes on a line, eliminating the need to bolt on external stops. For load-holding without live air pressure, note that this adjuster acts strictly as a travel stop and not a brake; you should specify an SAIL air-released lock or a BSAI clamp-lock cylinder instead.
When replacing an ISO 15552 cylinder, verify the 125mm bore, 260mm nominal stroke, 50mm adjustment range, PT G1/2 port, and your required mounting style. The SAIJ series supports Basic, FA, LB, TC, FTC, TCM1, and TCM2 mounts, deliberately omitting FB, CA, CB, and CR options. Because the 260mm stroke is under the 300mm threshold, side-load stress is moderate, but ensuring proper external guiding remains best practice for heavy loads.
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 SAIJ125X260-50 FAQ
It features a rear mechanical stopper that allows you to shorten the nominal 260mm stroke by up to 50mm. This creates a usable travel window of 210-260mm, enabling precise end-position tuning at commissioning without changing the cylinder.
At 0.5 MPa, it provides 6136N of push force and 5734N of pull force. At 0.9 MPa, the push force increases to 11045N.
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