Airtac SAIJ125 Adjustable Cylinder SAIJ125X950-20
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125X950-20 is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 950mm 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
- Stroke950 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125X950-20
The AirTAC SAIJ125X950-20 is a double-acting ISO 15552 profile cylinder featuring a rear stroke adjuster that permits fine-tuning of the retract end position. With a 950mm nominal stroke and a 20mm adjustment screw, it provides a usable travel window of 930-950mm. This allows you to dial in the exact end stop during commissioning or product changeovers without swapping the hardware or adding external stopper blocks. It delivers a robust 8590N push force at 0.7 MPa, making it suitable for heavy-duty positioning tasks.
This model incorporates a carbon steel piston rod and a PT tapered port thread. The extruded aluminum barrel includes sensor grooves on both sides for direct mounting of CMSE reed or DMSE electronic sensors, though this specific SKU is not magnetized. The rear adjuster functions strictly as a travel stop and works alongside the variable air cushions at both ends to decelerate the load; it does not lock the position pneumatically. For applications requiring true load-holding without live air pressure, the SAIL or BSAI series is recommended.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X950-20 Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X950-20 |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 950 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 SAIJ125X950-20
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×950 | 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 SAIJ125X950-20 Is Used
Heavy Fixture Positioning
Provides 8590N of thrust at 0.7 MPa to shift heavy machining fixtures, with the 20mm rear stopper allowing exact positioning against hard stops during initial commissioning.
Product Changeover Lines
Dial in the 930-950mm travel window on packaging or conveying lines to accommodate new carton sizes without disassembling the cylinder mount or adding external spacers.
Long-Stroke Assembly Presses
Handles long 950mm travel for large automated press setups, utilizing the built-in variable air cushions at both ends to decelerate heavy loads smoothly over the extended stroke.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X950-20 the Right Cylinder?
Choose this 125mm bore cylinder when a 100mm bore (5497N push at 0.7 MPa) lacks the thrust for your heaviest fixtures, but a 160mm bore (14074N) would be excessive overkill. The 20mm adjustable window is ideal for machines that require precise end-position tuning during setup or when accommodating slight variations in product size, offering flexibility a fixed-stroke SAI cannot match. Because the 950mm stroke is substantial, an external guide rail is highly recommended to prevent rod side-loading and premature seal wear over such a long unsupported travel distance.
When replacing an ISO 15552 cylinder, match the 125mm bore, 950mm stroke, PT port threads, and the required mounting accessory from the SAIJ subset (Basic, FA, LB, TC, FTC, TCM1, TCM2). Note that this series omits the FB, CA, CB, and CR mountings. As no -S magnet option is specified here, position sensing via CMSE or DMSE switches is not supported without a different rod configuration.
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 SAIJ125X950-20 FAQ
At 0.7 MPa operating pressure, this 125mm bore cylinder generates a push force of 8590N and a pull force of 5734N. At a maximum 1.0 MPa, the push force reaches 11045N.
The rear adjuster screw lets you trim the effective retract travel from 950mm down to 930mm. It acts as a mechanical stop to fine-tune the end position during setup and does not function as a lock or brake to hold the load without continuous air pressure.
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