Airtac SAIJ125 Adjustable Cylinder SAIJ125X800-20S
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125X800-20S is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 800mm 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
- Stroke800 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125X800-20S
The AirTAC SAIJ125X800-20-S is a double-acting ISO 15552 profile cylinder equipped with a rear stroke adjuster, enabling a usable travel window of 780 to 800 mm. It delivers 6136 N of push force at 0.5 MPa, scaling up to 11045 N at 0.9 MPa, making it a robust choice for heavy-duty positioning tasks. The extruded aluminum barrel features sensor grooves on both sides, and because this SKU includes the -S magnet, it directly supports AirTAC CMSE reed and DMSE electronic solid-state switches for precise end-of-stroke detection.
This model features a 32 mm carbon steel piston rod with an M27x2 thread, providing substantial rigidity, though an 800 mm stroke requires external guidance to prevent side-load damage. The rear adjuster acts purely as a mechanical stop to fine-tune the retract position during commissioning; it does not hold the load without live air pressure. For applications needing true load-holding without continuous air, consider the SAIL or BSAI series instead.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X800-20S Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X800-20S |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 800 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 SAIJ125X800-20S
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×800 | 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 SAIJ125X800-20S Is Used
Variable End-Stops
Dial in the retract position by up to 20 mm during machine setup to accommodate varying material thicknesses without physically remounting the cylinder.
Heavy-Duty Changeover
Leverage the 11045 N of force at 0.9 MPa to push heavy pallets, using the fine adjustment to tune the stopping distance for different product sizes on the line.
Long-Stroke Positioning
Utilize the 800 mm travel for large-format material handling, relying on the -S magnet and DMSE sensors to confirm full extension across the long distance.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X800-20S the Right Cylinder?
Select this adjustable model when you need to dial in the exact retract distance on the fly without swapping cylinders or adding external stopper blocks, which is highly beneficial during machine setup or product changeover. If your application requires less force, stepping down to a 100 mm bore yields 3927 N at 0.5 MPa, but the 125 mm bore is necessary for heavier payloads. Because the 800 mm stroke exceeds typical compact lengths, you must use an external guide to support the rod and prevent binding.
To match this exact configuration for an ISO 15552 replacement, specify a 125 mm bore, 800 mm stroke, 20 mm adjustment range, PT tapered port thread, and the -S magnet option. The SAIJ mounting set includes Basic, FA, LB, TC, FTC, TCM1, and TCM2, deliberately omitting the FB, CA, CB, and CR brackets found on some other series.
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 SAIJ125X800-20S FAQ
At 0.5 MPa, it provides 6136 N of push force and 5734 N of pull force. At 0.9 MPa, the push force increases to 11045 N.
A rear screw stopper lets you shorten the nominal 800 mm stroke by up to 20 mm, creating a 780-800 mm travel window. It acts as a mechanical stop and does not lock or hold the load without continuous air pressure.
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