Airtac SAIJ125 Adjustable Cylinder SAIJ125BX30-20S
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125BX30-20S is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 30mm 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
- Stroke30 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
- No minimum order. A single piece can be ordered.
- Ready in 3–5 business days. That is the time we take to process the order and hand it to the carrier. Transit time after that depends on the destination.
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125BX30-20S
The AirTAC SAIJ125X30-20-S is a double-acting ISO 15552 profile cylinder equipped with a rear stroke adjuster, enabling you to fine-tune the end position during commissioning. Based on a nominal 30 mm stroke, the external stopper provides up to 20 mm of adjustment, yielding a highly versatile 10-30 mm usable travel window. Delivering 6136 N of push force at 0.5 MPa, it handles heavy positioning tasks without needing external stops.
This specific configuration features a SUS304 stainless steel rod for superior corrosion resistance, PT tapered ports, and an integrated magnet for position sensing. The extruded aluminum barrel includes sensor grooves on both sides, allowing you to mount CMSE reed or DMSE electronic switches exactly where needed. Mounting options cover the SAIJ subset of Basic, FA, LB, TC, FTC, TCM1, and TCM2.
Airtac SAIJ125 Adjustable Cylinder SAIJ125BX30-20S Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125BX30-20S |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 30 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 SAIJ125BX30-20S
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×30 | 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 SAIJ125BX30-20S Is Used
Product Changeovers
Dial in the 10-30 mm travel window during format changes on a packaging line, avoiding the need to physically swap out the cylinder for different carton sizes.
Heavy Clamping Setup
Leverage the 6136 N thrust at 0.5 MPa to secure heavy workpieces, using the rear screw to fine-tune the clamp's end position to the exact material thickness.
Press Assembly Tuning
Precisely set the insertion depth of bearings or pins on an automated press, adjusting the stopper to compensate for tooling wear without altering the machine program.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125BX30-20S the Right Cylinder?
Choose this 125 mm bore when a 100 mm bore (providing 3927 N at 0.5 MPa) lacks the thrust for moving heavy jigs, but you want to avoid the larger 160 mm footprint. The 10-30 mm adjustable travel window is selected over a fixed-stroke SAI when a machine requires frequent product-size changeovers, letting operators dial in the exact end-stop without swapping cylinders. Because the stroke is under 300 mm, side-load stress on the 32 mm rod is minimal, though an external guide remains recommended for heavy lateral loads.
For drop-in replacements, match the 125 mm bore, 30 mm stroke, 20 mm adjustment, PT port thread, and the -S magnet option. Remember that the rear adjuster acts only as a travel stop and does not hold the load without live air pressure; for true fail-safe load holding, consider an AirTAC SAIL or BSAI cylinder.
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 SAIJ125BX30-20S FAQ
At a 0.5 MPa operating pressure, this 125 mm bore cylinder provides 6136 N of push force and 5734 N of pull force. If you need higher force, it can be run up to 1.0 MPa, yielding a maximum push force of 1251 kgf.
The nominal stroke is 30 mm, but the rear adjuster allows you to shorten the travel by up to 20 mm. This creates a 10-30 mm adjustable window, letting you set the exact retract end-position at commissioning without adding external physical stops.
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