Airtac SAIJ125 Adjustable Cylinder SAIJ125AX85-40S
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125AX85-40S is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 85mm 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
- Stroke85 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX85-40S
The AirTAC SAIJ125X85-40-S is a double-acting, single-rod ISO 15552 profile cylinder equipped with a rear stroke adjuster. It delivers 6136N of push force at 0.5MPa, stepping up to 11045N at 0.9MPa. The integrated -S magnet enables position detection with AirTAC CMSE reed or DMSE electronic solid-state switches mounted into the dual-side sensor grooves. This unit features a SUS420J2 stainless steel rod and PT tapered ports.
With a nominal 85mm stroke and a 40mm adjustment code, the usable travel window spans 45-85mm. You can fine-tune the retract end-position at commissioning or during product changeovers without swapping the cylinder or adding external stops. The rear adjuster functions strictly as a travel stop and works alongside the 40mm air cushions to decelerate the load; it does not hold the load without live air pressure.
Airtac SAIJ125 Adjustable Cylinder SAIJ125AX85-40S Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125AX85-40S |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 85 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 SAIJ125AX85-40S
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×85 | 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 SAIJ125AX85-40S Is Used
Product Changeover
Dial in the 45-85mm travel window during packaging line format changes to accommodate varying carton sizes without mechanical rebuilds.
End-Stop Calibration
Fine-tune the retract position during machine commissioning to perfectly seat heavy 6136N assemblies without adding external hard stops.
Variable Forming Depth
Adjust the stroke on the fly for pressing or forming applications that require precise, repeatable depth control across different material batches.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX85-40S the Right Cylinder?
Select this 125mm bore when an 80mm cylinder (providing 2513N push at 0.5MPa) lacks the necessary thrust, but you want to avoid the size and air consumption of a 160mm bore. The adjustable 45-85mm travel window is ideal for machines requiring variable end-stops. Because the stroke is under 300mm, side-load risks are moderate, though the 32mm rod and M27x2 thread provide robust resistance. For load-holding without live air pressure, select a SAIL or BSAI cylinder instead, as the SAIJ adjuster is not a lock.
This cylinder is dimensionally interchangeable per ISO 15552. To match this exact configuration, specify the 125mm bore, 85mm stroke, 40mm adjustment, PT tapered ports, SUS420J2 rod, and the -S magnet. It uses a reduced mounting set of Basic, FA, LB, TC, FTC, TCM1, and TCM2, omitting FB, CA, CB, and CR.
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 SAIJ125AX85-40S FAQ
The rear adjuster acts as a mechanical stop that trims the retract stroke. For the SAIJ125X85-40-S, you can reduce the 85mm nominal stroke by up to 40mm, creating a usable travel window of 45-85mm to fine-tune the end position.
At 0.5MPa it provides 6136N of push force and 5734N of pull force. At 0.9MPa, the push force increases to 11045N.
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