Airtac SAIJ125 Adjustable Cylinder SAIJ125AX185-75S
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125AX185-75S is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 185mm 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
- Stroke185 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX185-75S
The AirTAC SAIJ125X185-75-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, stepping up to 11045 N at 0.9 MPa. The integrated -S magnet enables position sensing with AirTAC CMSE reed and DMSE electronic switches. This unit features a SUS420J2 stainless steel rod and PT tapered ports.
With a nominal 185 mm stroke and a 75 mm adjustment range, the usable travel window spans 110 to 185 mm. This built-in adjuster acts as a mechanical stop to fine-tune the retract position during commissioning. It is not a locking device and requires live air to hold the load. The extruded aluminum profile includes sensor grooves on both sides for flexible switch mounting.
Airtac SAIJ125 Adjustable Cylinder SAIJ125AX185-75S Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125AX185-75S |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 185 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 SAIJ125AX185-75S
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×185 | 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 SAIJ125AX185-75S Is Used
Product Changeovers
Quickly shift the retract end-stop by up to 75 mm when running different product sizes on the same line, minimizing downtime between batches.
Machine Setup
Dial in the exact 110-185 mm travel window during commissioning without physically swapping out the entire ISO 15552 cylinder.
High-Force Positioning
Leverage 6136 N of thrust at 0.5 MPa to move heavy pallets, using the rear stopper to precisely set the final resting position.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX185-75S the Right Cylinder?
Choose this 125 mm bore when an 80 mm bore (2513 N push at 0.5 MPa) lacks thrust, but a 160 mm bore (10053 N at 0.5 MPa) is physically too large. The 75 mm adjustment window is ideal for product changeovers, allowing you to dial in the exact end-stop without swapping the cylinder or adding external stops. For load-holding without pneumatic pressure, select a SAIL or BSAI cylinder instead, as the SAIJ adjuster only restricts travel.
To match this exact ISO 15552 replacement, specify: 125 mm bore, 185 mm stroke, 75 mm adjustment, PT ports, and the -S magnet. Mounting options are limited to Basic, FA, LB, TC, FTC, TCM1, and TCM2. Because the 185 mm stroke exceeds 300 mm? No, but for any stroke over 300 mm you would need external guides to prevent side-loading; at 185 mm, the 32 mm rod handles standard loads well. Operating speed is 30-500 mm/s.
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 SAIJ125AX185-75S FAQ
At 0.5 MPa it provides 6136 N of push force and 5734 N of pull force. At 0.9 MPa, the push force increases to 11045 N.
The rear adjuster acts as a mechanical stop, allowing you to shorten the effective stroke from 185 mm down to 110 mm. It sets the travel end but does not lock the load without live air.
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