Airtac SAIJ125 Adjustable Cylinder SAIJ125BX155-30S
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125BX155-30S is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 155mm 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
- Stroke155 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 SAIJ125BX155-30S
The AirTAC SAIJ125X155-30-S is a double-acting ISO 15552 profile cylinder equipped with a rear stroke adjuster, enabling a usable travel window of 125 to 155 mm. Delivering 8590 N of push force at 0.7 MPa, this 125 mm bore actuator handles heavy loads with precision. It features a SUS304 stainless steel rod for superior corrosion resistance and includes a built-in magnet for switch sensing.
A key design advantage is the external rear stopper, which fine-tunes the retract end position during commissioning without adding external stops. The extruded aluminum barrel includes sensor grooves on both sides, supporting AirTAC CMSE reed and DMSE electronic solid-state switches. The rear adjuster acts purely as a travel stop and does not hold the load without live air pressure.
Airtac SAIJ125 Adjustable Cylinder SAIJ125BX155-30S Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125BX155-30S |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 155 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 SAIJ125BX155-30S
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×155 | 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 SAIJ125BX155-30S Is Used
Variable End-Position Tuning
Dial in the exact retract distance from 125 to 155 mm during machine commissioning to accommodate varying material thicknesses without mechanical rework.
Product Changeover Adjustments
Quickly adapt the stroke window on a packaging conveyor when switching between different carton sizes, using the rear stopper to set new endpoints in seconds.
Heavy-Duty Forming Press
Leverage the 8590 N push force at 0.7 MPa for rigid clamping or forming tasks, using the adjustable stroke to compensate for tooling wear over time.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125BX155-30S the Right Cylinder?
Select this 125 mm bore model when an application requires substantial thrust, stepping up from a 100 mm bore that yields 5497 N push at 0.7 MPa. The adjustable 30 mm stroke window is ideal for product changeovers on a packaging line, allowing operators to dial in the exact end position without swapping the entire cylinder for a fixed-stroke SAI variant. If the machine requires true fail-safe load holding without live air, consider the SAIL or BSAI series instead, as the SAIJ adjuster is not a locking mechanism.
This specific SKU is configured with PT tapered ports and a SUS304 stainless steel rod. It supports the reduced SAIJ mounting set: Basic, FA, LB, TC, FTC, TCM1, and TCM2, deliberately omitting FB, CA, CB, and CR brackets. The 155 mm nominal stroke falls below the 300 mm side-load threshold, but the robust 32 mm rod and M27x2 thread handle high axial stress effectively.
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 SAIJ125BX155-30S FAQ
At an operating pressure of 0.7 MPa, this 125 mm bore cylinder provides 8590 N of push force and 5734 N of pull force. It can deliver a maximum push force of 11045 N at 0.9 MPa.
The rear adjuster screw acts as a mechanical stop that allows you to shorten the effective travel from the 155 mm nominal stroke down to 125 mm. This creates a 30 mm adjustable window for fine-tuning the end position at commissioning without replacing the cylinder.
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