Airtac SAIJ125 Adjustable Cylinder SAIJ125X300-40S
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125X300-40S is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 300mm 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
- Stroke300 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125X300-40S
The AirTAC SAIJ125X300-40-S is a double-acting, single-rod ISO 15552 profile cylinder equipped with a rear stroke adjuster. It delivers 6136 N of push force at 0.5 MPa and features a 300 mm nominal stroke that can be fine-tuned down by up to 40 mm, yielding a usable travel window of 260-300 mm. This built-in adjustability allows you to dial in the exact retract end-position during commissioning without swapping out the cylinder or adding external mechanical stops.
This model includes a magnet for position sensing and operates at speeds between 30-500 mm/s. It uses a PT tapered G1/2 port and a robust 32 mm carbon steel rod with an M27x2 thread, providing excellent resistance against side loads. The extruded aluminum barrel incorporates sensor grooves on both sides for flexible mounting of CMSE reed or DMSE electronic switches.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X300-40S Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X300-40S |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 300 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 SAIJ125X300-40S
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×300 | 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 SAIJ125X300-40S Is Used
Product Size Changeovers
Quickly reconfigure the 260-300 mm retract end-stop when adapting machinery to run a different product size, eliminating the need to physically swap cylinders.
Commissioning Fine-Tuning
Dial in the exact end-of-stroke position during machine setup to perfect alignment and seating forces without fabricating custom external spacers.
Heavy Material Handling
Leverage the 6136 N push force at 0.5 MPa to move heavy pallets or workpieces, relying on the 32 mm carbon steel rod for structural durability.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X300-40S the Right Cylinder?
Choose this 125 mm bore when an 80 mm cylinder (providing 2513 N push at 0.5 MPa) lacks the thrust for heavy positioning, but a 160 mm bore is physically oversized. The adjustable stroke is ideal for product changeovers on a line, allowing the retract stop to be reconfigured on the fly. Because the nominal stroke is 300 mm, the 32 mm rod and M27x2 thread provide rigidity, but an external guide is recommended to prevent excessive side-loading on long extensions.
When specifying an ISO 15552 replacement, match the 125 mm bore, 300 mm stroke, 40 mm adjustment range, PT G1/2 port, and the -S magnet requirement. Remember that the rear adjuster acts strictly as a travel stop, not a locking device; the cylinder cannot hold a load without live air pressure. For secure load-holding, consider the SAIL or BSAI series instead. SAIJ supports a reduced mounting set of Basic, FA, LB, TC, FTC, TCM1, and TCM2, omitting FB, CA, CB, and CR brackets.
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 SAIJ125X300-40S FAQ
At 0.5 MPa operating pressure, this 125 mm bore cylinder 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 adjuster acts as an external stopper that shortens the effective retract stroke. For this 300 mm stroke model, you can trim the travel back by up to 40 mm, creating a usable window of 260-300 mm to perfectly tune the end position.
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