Airtac SAIJ125 Adjustable Cylinder SAIJ125AX220-50S
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125AX220-50S 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 SAIJ125AX220-50S
The AirTAC SAIJ125X220-50-S is a double-acting ISO 15552 profile cylinder featuring a rear stroke adjuster that allows you to trim the nominal 220 mm travel back by up to 50 mm, creating a usable window of 170 to 220 mm. It delivers 6136 N of push force and 5734 N of pull force at 0.5 MPa, making it a robust choice for heavy actuation. This variant includes a magnet for position sensing and uses a SUS420J2 stainless steel rod for enhanced corrosion resistance.
Equipped with PT tapered ports (G1/2), it operates at speeds of 30-500 mm/s and relies on 40 mm adjustable air cushions at both ends to decelerate heavy loads. The extruded aluminum barrel features sensor grooves on both sides, accommodating AirTAC CMSE reed and DMSE solid-state switches without extra brackets. The rear adjuster acts purely as a mechanical stop to set the end position and cannot hold a load without live air pressure.
Airtac SAIJ125 Adjustable Cylinder SAIJ125AX220-50S Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125AX220-50S |
|---|---|
| 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 SAIJ125AX220-50S
| 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 SAIJ125AX220-50S Is Used
Product Changeover
Dial in the exact retract distance for different package lengths on a packaging line using the 50 mm rear stopper, avoiding physical cylinder swaps.
Heavy Pressing
Leverage 6136 N of thrust at 0.5 MPa to seat bearings or form parts, using the adjustable end-stop to prevent overtravel during setup.
Machine Commissioning
Fine-tune the 170-220 mm travel window on-site to dial in exact end-of-stroke positions without machining external bumpers.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX220-50S the Right Cylinder?
Choose this 125 mm bore when an application requires over 6000 N of force at 0.5 MPa, stepping up from a 100 mm bore that provides 3927 N. The 50 mm adjustment range is ideal for production lines running multiple product sizes, allowing you to fine-tune the retract end position during changeovers rather than swapping out the entire cylinder or adding external stops. For load-holding requirements without continuous air pressure, consider an AirTAC SAIL pneumatic lock or BSAI clamp-lock cylinder, as the SAIJ adjuster is strictly a travel stop.
To replace an ISO 15552 cylinder with this model, verify the 125 mm bore, 220 mm stroke, 50 mm adjustment range, PT port thread, and the -S magnet requirement. The SAIJ mounting set includes Basic, FA, LB, TC, FTC, TCM1, and TCM2 options, omitting the FB, CA, CB, and CR styles. Since the 32 mm rod and M27x2 thread provide substantial side-load capacity, ensure you use an external guide for the 220 mm stroke to prevent binding.
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 SAIJ125AX220-50S FAQ
At 0.5 MPa operating pressure, it provides 6136 N of push force and 5734 N of pull force. At 0.7 MPa, the push force increases to 8590 N.
The rear adjusting screw acts as a mechanical stop, allowing you to shorten the 220 mm nominal stroke by up to 50 mm, resulting in a usable travel range of 170 to 220 mm. It does not lock the load without live air.
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