Airtac SAIJ125 Adjustable Cylinder SAIJ125X220-40S
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125X220-40S is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 220mm 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
- Stroke220 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125X220-40S
The AirTAC SAIJ125X220-40-S is a double-acting, single-rod ISO 15552 profile cylinder equipped with a rear stroke adjuster. It delivers substantial thrust, generating 6136N of pull force and 8590N of push force at 0.7 MPa. The built-in rear adjusting screw allows you to trim the effective travel back by up to 40 mm, creating a precise 180-220 mm usable stroke window for exact end-position tuning at commissioning.
This 125 mm bore variant features a robust 32 mm carbon steel rod and an M27x2 rod thread, which together handle high side loads better than smaller bores, though an external guide is still recommended for optimal longevity. The extruded aluminum barrel includes sensor grooves on both sides, and because this SKU includes a magnet (-S), it directly supports AirTAC CMSE reed and DMSE electronic solid-state switches for exact position feedback.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X220-40S Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X220-40S |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 220 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 SAIJ125X220-40S
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×220 | 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 SAIJ125X220-40S Is Used
Press Stroke Tuning
Dial in the exact 180-220 mm travel window during machine commissioning to accommodate varying material thicknesses without replacing the cylinder.
Product Changeover
Quickly adjust the retract end-stop by up to 40 mm on automated packaging lines when switching between different carton or part sizes.
Heavy Duty Positioning
Leverage the 6136N pull force to shift heavy jigs or fixtures into precise working positions, using the rear screw for final alignment.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X220-40S the Right Cylinder?
Select this adjustable model when your machine setup requires variable end stops or frequent product-size changeovers, as it eliminates the need to swap cylinders or bolt on external stopper blocks. If your application demands less force, stepping down to a 100 mm bore yields 3681N of pull force at 0.5 MPa; conversely, moving up to a 160 mm bore provides 9425N of pull force. To replace this cylinder on an ISO 15552 footprint, match the 125 mm bore, 220 mm stroke, 40 mm adjustment, PT tapered port thread, and the -S magnet option.
Remember that the rear adjuster functions strictly as a travel stop to set deceleration, not as a locking device. A plain SAIJ cylinder cannot hold a load or maintain position without live air pressure. If your setup requires true fail-safe load holding, consider the AirTAC SAIL pneumatic lock series or an external pilot-operated check valve instead.
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 SAIJ125X220-40S FAQ
It features an external adjusting screw at the rear cap that acts as a mechanical stop. For this specific model, you can shorten the 220 mm nominal stroke by up to 40 mm, giving you an adjustable travel window between 180 and 220 mm to fine-tune the end position.
At 0.5 MPa, it provides 6136N of push force and 5734N of pull force. At 0.7 MPa, the push force increases to 8590N. The operational speed range for this 125 mm bore is 30-500 mm/s.
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