Airtac SAIJ125 Adjustable Cylinder SAIJ125X145-50S
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125X145-50S is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 145mm 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
- Stroke145 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125X145-50S
The AirTAC SAIJ125X145-50-S is a double-acting ISO 15552 profile cylinder featuring a rear-mounted stroke adjuster. It provides a usable travel window of 95 to 145 mm, letting you dial back the nominal 145 mm stroke by up to 50 mm during machine setup or product changeovers. It delivers a robust 6136 N push force at 0.5 MPa, scaling up to 11045 N at 0.9 MPa, making it suitable for heavy-duty positioning tasks.
This unit includes a standard carbon steel piston rod and PT tapered port threads. The -S magnet option supports position sensing via AirTAC CMSE reed and DMSE solid-state switches fitted into the dual-side sensor grooves on the extruded aluminum barrel. It supports a standard operating speed of 30-500 mm/s.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X145-50S Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X145-50S |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 145 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 SAIJ125X145-50S
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×145 | 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 SAIJ125X145-50S Is Used
Product Changeover
Quickly modify the effective end-of-stroke position by up to 50 mm when switching between product sizes on a packaging line, eliminating the need for physical spacer changes.
Heavy Press Tuning
Leverage the 11045 N push force at 0.9 MPa to execute powerful pressing or clamping operations while fine-tuning the exact bottoming position during commissioning.
Automated Forming
Use the adjustable 95-145 mm travel window to precisely set metal-forming or bending depths without reprogramming the machine cycle or altering the pneumatic plumbing.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X145-50S the Right Cylinder?
Select this 125 mm bore cylinder when your application requires heavy force output that exceeds the 3927 N push capacity of the 100 mm bore at 0.5 MPa, but you want to avoid the larger 160 mm frame. The 50 mm adjustment range is perfect for fine-tuning end positions on the fly without adding external physical stops or swapping out the entire cylinder for a fixed-stroke SAI variant.
For ISO 15552 replacement matching, ensure you specify the 125 mm bore, 145 mm stroke, up to 50 mm adjustment range, PT port threads, and the -S magnet option. The available mounting set includes Basic, FA, LB, TC, FTC, TCM1, and TCM2. Remember that the rear adjuster acts only as a travel stop; it does not hold the load without live air pressure. For true fail-safe load holding, consider the SAIL or BSAI series 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 SAIJ125X145-50S FAQ
At 0.5 MPa, this 125 mm bore cylinder provides 6136 N of push force and 5734 N of pull force. At 0.9 MPa, the push force increases to 11045 N.
The rear adjuster screw acts as a mechanical stop, allowing you to shorten the effective stroke from the 145 mm nominal length down to as little as 95 mm. This enables precise end-position tuning at commissioning without replacing the cylinder.
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