Airtac SAIJ125 Adjustable Cylinder SAIJ125X260-20
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125X260-20 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 SAIJ125X260-20
The AirTAC SAIJ125X260-20 is a double-acting ISO 15552 profile cylinder featuring a rear stroke adjuster that creates a usable travel window of 240 to 260 mm. Delivering 6136 N of push force and 5734 N of pull force at 0.5 MPa, it is built for heavy-duty positioning. The carbon steel piston rod utilizes an M27x2 thread, providing a robust interface for high-load linkages.
This model operates at speeds of 30-500 mm/s and includes variable air cushions at both ends to manage kinetic energy. The extruded aluminum barrel features sensor grooves on both sides for CMSE reed or DMSE electronic switches, though this specific SKU is configured without a magnet. Mounting options are restricted to the SAIJ subset: Basic, FA, LB, TC, FTC, TCM1, and TCM2, omitting the FB, CA, CB, and CR brackets found on other ISO variants.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X260-20 Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X260-20 |
|---|---|
| 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 SAIJ125X260-20
| 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 SAIJ125X260-20 Is Used
Machine Changeovers
Dial in the exact retract distance within the 240-260 mm window when switching product sizes on a packaging line, eliminating the need for physical spacer changes.
End-Position Tuning
Fine-tune the final end-stop during initial commissioning to compensate for mechanical tolerances in the fixture without disassembling the cylinder.
Heavy-Duty Clamping
Leverage the 6136 N push force at 0.5 MPa to secure heavy workpieces, using the adjustable stop to set precise clamping depth limits.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X260-20 the Right Cylinder?
Choose this 125 mm bore when a 100 mm bore (offering 3927 N push at 0.5 MPa) cannot provide enough thrust, but a 160 mm bore (10053 N push) would be excessive overkill. The 20 mm rear adjustment screw is ideal for fine-tuning the retract end-position during commissioning or product changeovers without swapping the cylinder or adding external stops.
Because the 260 mm stroke exceeds 250 mm, ensure adequate external guidance to prevent side-load damage to the M27x2 rod thread. The rear adjuster functions strictly as a travel stop and deceleration setter, not a locking device; it will not hold the load without live air pressure. For load-holding requirements, specify an SAIL air-released lock, a BSAI clamp-lock, or an external pilot-operated check valve. To replace an ISO 15552 cylinder, match the 125 mm bore, 260 mm stroke, PT tapered G1/2 port, the required mounting bracket, and add an -S suffix if position sensing is needed.
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 SAIJ125X260-20 FAQ
At 0.5 MPa operating pressure, this 125 mm bore cylinder provides 6136 N of push force and 5734 N of pull force. At the maximum pressure of 1.0 MPa, the push force reaches 1251 kgf.
The rear adjuster screw allows you to shorten the effective stroke by up to 20 mm, providing a usable travel window of 240 to 260 mm. The adjuster acts as a mechanical stop for the retract end and does not function as a lock to hold the load without air pressure.
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