Airtac SAIJ125 Adjustable Cylinder SAIJ125AX300-50
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125AX300-50 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 SAIJ125AX300-50
The AirTAC SAIJ125X300-50 is a double-acting ISO 15552 profile cylinder equipped with a rear stroke adjuster, delivering 8590 N of push force at 0.7 MPa. Its 300 mm nominal stroke incorporates a 50 mm adjustment range, yielding a usable travel window of 250-300 mm. This allows operators to dial in exact retract end positions during commissioning without adding external stops. The extruded aluminum barrel features sensor grooves on both sides for flexible switch mounting.
This heavy-duty unit utilizes an SUS420J2 stainless steel rod for enhanced durability against moisture and minor corrosion. It operates at speeds of 30-500 mm/s and uses PT tapered port threads (G1/2). The rear adjuster functions strictly as a travel stop to set deceleration endpoints, meaning it will not hold a load safely without continuous live air pressure.
Airtac SAIJ125 Adjustable Cylinder SAIJ125AX300-50 Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125AX300-50 |
|---|---|
| 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 SAIJ125AX300-50
| 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 SAIJ125AX300-50 Is Used
Product Changeovers
Dial in the exact 250-300 mm end position instantly when switching product sizes on a packaging line, avoiding mechanical cylinder swaps.
Heavy Press Fitment
Leverage the 8590 N push force at 0.7 MPa to seat heavy components, using the rear stopper to prevent over-travel during final assembly.
Machine Commissioning
Fine-tune the retract endpoint during initial machine setup to perfect timing sequences without machining new hard stops.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX300-50 the Right Cylinder?
Select this 125 mm bore when an application requires substantial thrust that exceeds the 5497 N push force of a 100 mm cylinder at 0.7 MPa, but does not necessitate stepping up to a 160 mm unit. The adjustable 250-300 mm window is perfect for machinery requiring frequent product changeovers, allowing precise end-position tuning on the fly instead of physically swapping out a fixed-stroke SAI cylinder. For an exact ISO 15552 replacement match, verify the 300 mm stroke, 50 mm adjustment, PT port thread, and mounting style.
Because this model features a 300 mm stroke, the 32 mm diameter rod and M27x2 rod thread must be adequately supported to prevent excessive side-loading; always guide the load externally on longer travels. If the machine demands true load-holding without pneumatic pressure, a standard SAIJ is insufficient—consider an AirTAC SAIL with an air-released lock or a BSAI clamp-lock cylinder instead. Mounting options are limited to 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 SAIJ125AX300-50 FAQ
At 0.7 MPa operating pressure, this 125 mm bore cylinder provides 8590 N of push force and 5734 N of pull force. At the maximum 1.0 MPa pressure, it delivers up to 1251 kgf.
The rear adjuster acts as a mechanical stop that trims the effective travel. For this 300 mm stroke cylinder, it creates a usable travel window of 250-300 mm, allowing you to shorten the stroke by up to 50 mm during setup. It is a stop, not a lock, and requires live air to hold position.
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