Airtac SAIJ125 Adjustable Cylinder SAIJ125AX170-20S
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125AX170-20S is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 170mm 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
- Stroke170 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX170-20S
The AirTAC SAIJ125X170-20-S is a double-acting ISO 15552 profile cylinder equipped with a rear stroke adjuster, providing a usable travel window of 150 to 170 mm. Operating at 0.5 MPa, it delivers 6136 N of push force and 5734 N of pull force, making it well-suited for heavy-duty positioning tasks. The integrated -S magnet enables direct mounting of CMSE reed and DMSE electronic sensors along the dual-side barrel grooves for precise end-of-trroke detection.
This unit features a SUS420J2 stainless steel rod (material code A) and PT tapered port threads (G1/2). Unlike a fixed-stroke SAI cylinder, the rear mechanical stopper allows you to fine-tune the retract position during commissioning without adding external stops. Remember that this adjuster acts strictly as a travel stop and deceleration boundary, not a lock, so the cylinder cannot hold a load without live air pressure.
Airtac SAIJ125 Adjustable Cylinder SAIJ125AX170-20S Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125AX170-20S |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 170 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 SAIJ125AX170-20S
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×170 | 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 SAIJ125AX170-20S Is Used
Variable End Stops
Dial in the exact retract distance from 150 to 170 mm during machine setup to accommodate varying product sizes without physically replacing the cylinder.
Changeover Adjustment
Quickly fine-tune the end-of-stroke position on production lines during format changeovers, saving downtime compared to repositioning fixed mechanical stops.
Heavy Positioning
Leverage the 6136 N push force to move and position heavy assemblies, using the rear adjuster to set precise deceleration limits for the retract stroke.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX170-20S the Right Cylinder?
Select this 125 mm bore cylinder when your application requires the 6136 N thrust class at 0.5 MPa but demands variable end-position tuning. If you need less force, stepping down to an 80 mm bore yields 2513 N, whereas moving up to a 160 mm bore provides 10053 N. The adjustable 150-170 mm window is ideal for product changeovers on a line, letting you dial in the exact retract distance on the fly instead of swapping out the entire cylinder body.
When replacing an ISO 15552 cylinder, match the 125 mm bore, 170 mm nominal stroke, 20 mm adjustment range, PT G1/2 port, and the -S magnet requirement. SAIJ supports a reduced mounting set including Basic, FA, LB, TC, FTC, TCM1, and TCM2, deliberately omitting FB, CA, CB, and CR. Because the 170 mm stroke is below the 300 mm threshold, side-load risks are minimal, but an external guide is still recommended for heavy lateral loads. For applications requiring true load-holding without live air, consider the SAIL or BSAI series instead.
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 SAIJ125AX170-20S FAQ
At a standard operating pressure of 0.5 MPa, this 125 mm bore cylinder provides 6136 N of push force and 5734 N of pull force. It can achieve a maximum push force of 11045 N at 0.9 MPa.
The rear mechanical stopper allows you to shorten the nominal 170 mm stroke by up to 20 mm, creating a usable travel window of 150 to 170 mm. This adjuster acts only as a travel stop to set the end position and does not lock or hold the load without continuous air pressure.
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