Airtac SAIJ125 Adjustable Cylinder SAIJ125AX550-75S
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125AX550-75S is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 550mm 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
- Stroke550 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX550-75S
The AirTAC SAIJ125X550-75-S is a double-acting ISO 15552 profile cylinder featuring a rear stroke adjuster. It provides a nominal 550 mm stroke that can be fine-tuned down by up to 75 mm, giving an effective usable travel window of 475-550 mm. This allows precise end-position calibration during commissioning without swapping the cylinder. Equipped with a SUS420J2 stainless steel rod (material code A), it handles heavy loads with a push force of 6136 N at 0.5 MPa.
This model includes a magnet (-S) for position sensing and is fully compatible with AirTAC CMSE reed and DMSE electronic solid-state switches. The extruded aluminum barrel includes sensor grooves on both sides for flexible mounting. It operates at speeds of 30-500 mm/s and uses a G1/2 port. The rear adjuster acts strictly as a travel stop to set deceleration endpoints, not as a load-holding lock.
Airtac SAIJ125 Adjustable Cylinder SAIJ125AX550-75S Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125AX550-75S |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 550 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 SAIJ125AX550-75S
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×550 | 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 SAIJ125AX550-75S Is Used
Variable End-Stop Setup
Dial in the 475-550 mm travel window during machine commissioning to perfectly strike a workpiece without adding external mechanical stops.
Product Changeover
Quickly re-adjust the rear stopper for different product sizes on a single line, reducing downtime between runs.
Heavy Forming Positioning
Leverage the 6136 N push force at 0.5 MPa to position heavy materials, relying on the adjuster to fine-tune the press depth.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX550-75S the Right Cylinder?
Choose this 125 mm bore when you need substantial thrust, such as the 6136 N push force at 0.5 MPa, stepping up from a 100 mm bore that provides 3927 N. An adjustable stroke is ideal for machinery requiring variable end-stops during product changeovers, eliminating the need for fixed-stroke SAI cylinders or external stops. Because the stroke is 550 mm, an external guide is recommended to prevent excessive side-load wear on the rod and M27x2 thread.
When seeking an ISO 15552 replacement, match the 125 mm bore, 550 mm stroke, 75 mm adjustment, G1/2 PT port, and the -S magnet. Remember that a plain SAIJ does not hold its load without live air pressure; for true drop prevention, select a SAIL pneumatic lock or BSAI clamp-lock cylinder instead. Mounting options include the reduced SAIJ set: Basic, FA, LB, TC, FTC, TCM1, and TCM2.
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 SAIJ125AX550-75S FAQ
At 0.5 MPa operating pressure, this 125 mm bore cylinder provides a push force of 6136 N and a pull force of 5734 N. At 0.7 MPa, the push force increases to 8590 N.
The rear adjuster acts as a mechanical stop that lets you shorten the 550 mm nominal stroke by up to 75 mm. This creates a usable travel window of 475-550 mm for fine-tuning the retract end position without replacing the cylinder.
Authorized Export Seller
Genuine AirTAC parts produced by AirTAC factory.
1-Year Warranty
Covers non-human-caused product damage.
Fast Dispatch
Standard models usually ship in 3-4 days.
Fast Reply
Most inquiries answered within 7-8 hours.
Related AirTAC SAI Cylinders
Request a Quote for Airtac SAIJ125 Adjustable Cylinder SAIJ125AX550-75S
Send us the quantity and destination. We confirm price, stock and lead time — usually within 7-8 hours.