Airtac SAIJ125 Adjustable Cylinder SAIJ125AX155-30
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125AX155-30 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
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX155-30
The AirTAC SAIJ125X155-30 is a double-acting ISO 15552 profile cylinder equipped with a rear stroke adjuster, allowing you to dial back the 155 mm nominal stroke by up to 30 mm. This creates a precise 125-155 mm usable travel window, enabling fine end-position tuning at commissioning without swapping out the cylinder or adding external stops. It delivers 6136 N of push force at 0.5 MPa and features a robust 32 mm SUS420J2 stainless steel rod with an M27x2 thread.
Because the adjuster acts purely as a mechanical stop on the retract end, it does not hold the load without live air pressure. This extruded aluminum barrel includes sensor grooves on both sides, though this non-magnet version cannot host CMSE or DMSE switches. The mounting set covers Basic, FA, LB, TC, FTC, TCM1, and TCM2, omitting FB, CA, CB, and CR.
Airtac SAIJ125 Adjustable Cylinder SAIJ125AX155-30 Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125AX155-30 |
|---|---|
| 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 SAIJ125AX155-30
| 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 SAIJ125AX155-30 Is Used
Machine Setup & Commissioning
Fine-tune the exact end-of-stroke position during initial machine commissioning, trimming up to 30 mm to perfect the motion without machining new hard stops.
Product-Size Changeovers
Quickly adapt a packaging line for different product sizes by dialing in the 125-155 mm travel window, minimizing downtime between production runs.
Variable End-Stop Positioning
Achieve precise mechanical end-stop positioning for heavy forming or pressing tasks, relying on the 6136 N thrust capacity and rear stopper tuning.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX155-30 the Right Cylinder?
Choose this 125 mm bore when an 80 mm cylinder's 2513 N push at 0.5 MPa is insufficient, but a 160 mm bore (10053 N) would be excessive overkill. The adjustable stroke is ideal for product-size changeovers on a line, letting you set variable end-stops on the fly. For exact ISO 15552 replacement matching, verify the 155 mm stroke, the 30 mm adjustment, PT tapered ports, and your required mounting style. Note that a plain SAIJ does not hold position without live air; for true load-holding without pressure, consider the SAIL or BSAI series.
With a 155 mm stroke, the load is relatively well-supported, but the substantial 32 mm rod diameter and M27x2 thread handle high side loads effectively. If your application involves heavy off-center loads, always use an external guide to prevent premature seal wear.
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 SAIJ125AX155-30 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. It can reach a maximum of 1251 kgf at 1.0 MPa.
The rear adjusting screw acts as a mechanical stop that lets you shorten the 155 mm nominal stroke by up to 30 mm, creating a usable travel window of 125 to 155 mm. It only sets the travel end and does not lock the load without live air pressure.
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