Airtac SAIJ125 Adjustable Cylinder SAIJ125AX100-20S
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125AX100-20S is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 100mm 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
- Stroke100 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX100-20S
The AirTAC SAIJ125X100-20-S is a double-acting ISO 15552 profile cylinder equipped with a rear stroke adjuster, allowing you to fine-tune the end position during commissioning. With a nominal 100 mm stroke and a 20 mm adjustment range, it provides a usable travel window of 80 to 100 mm without requiring external stops. It delivers robust performance, generating 8590 N of pull force at 0.5 MPa and 11045 N at 0.9 MPa.
This variant features a SUS420J2 stainless steel rod for enhanced durability against moisture and PT tapered port threads. The extruded aluminum barrel includes sensor grooves on both sides, and the included magnet (-S) supports AirTAC CMSE reed and DMSE electronic solid-state switches for precise position feedback. It uses a reduced mounting set of Basic, FA, LB, TC, FTC, TCM1, and TCM2.
Airtac SAIJ125 Adjustable Cylinder SAIJ125AX100-20S Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125AX100-20S |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 100 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 SAIJ125AX100-20S
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×100 | 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 SAIJ125AX100-20S Is Used
Machine Setup Calibration
Dial in the exact 80-100 mm travel window during initial commissioning to perfectly align heavy pressing forces without swapping physical cylinder bodies.
Product Changeover
Quickly adjust the rear stopper by up to 20 mm to accommodate varying product sizes on an automated assembly line during production shifts.
Heavy Assembly Stations
Leverage the 11045 N push force at 0.9 MPa to seat large components, using the fine-tune screw to guarantee precise end-positioning.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX100-20S the Right Cylinder?
Selecting this 125 mm bore model is ideal when your application requires up to 11045 N of thrust at 0.9 MPa, stepping up from a 100 mm bore that provides 7068 N. The adjustable stroke is chosen over a fixed SAI cylinder when you need variable end-stops for product changeovers or precise machine setup. The rear adjuster acts purely as a travel stop to set deceleration; it does not hold the load without live air. For load-holding without pressure, consider the SAIL or BSAI series.
When configuring your ISO 15552 replacement, match the 125 mm bore, 100 mm nominal stroke, 20 mm adjustment, PT ports, and the -S magnet. The 32 mm rod and M27x2 thread handle high side loads well, but for any stroke over 300 mm, an external guide is recommended to prevent rod bending.
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 SAIJ125AX100-20S FAQ
The rear adjuster screw allows you to shorten the effective travel by up to 20 mm. This gives the 100 mm nominal stroke a usable window of 80 to 100 mm, letting you set the exact retract position at commissioning without adding external stops.
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 and the pull force to 8590 N.
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