Airtac SAIJ125 Adjustable Cylinder SAIJ125X275-100S
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125X275-100S is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 275mm 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
- Stroke275 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125X275-100S
The AirTAC SAIJ125X275-100-S is a double-acting ISO 15552 profile cylinder equipped with a rear stroke adjuster, allowing you to dial back the nominal 275 mm travel to a precise usable window of 175-275 mm. Delivering 6136 N of push force at 0.5 MPa (up to 11045 N at 0.9 MPa), it provides substantial thrust for heavy-duty positioning. The integrated -S magnet enables direct mounting of CMSE reed and DMSE solid-state sensors along the dual-sided extruded barrel grooves.
This adjustable variant eliminates the need to physically swap cylinders during product changeovers, letting you fine-tune the retract end-position externally. The 32 mm carbon steel rod and M27x2 thread provide a robust interface, though the 275 mm stroke warrants an external guide to prevent side-loading wear. The rear screw functions purely as a travel stop for deceleration, not a lock, so live air is required to hold the load.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X275-100S Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X275-100S |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 275 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 SAIJ125X275-100S
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×275 | 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 SAIJ125X275-100S Is Used
Machine Changeover Setup
Dial in the exact retract position from 175 to 275 mm during product format changes without disassembling the pneumatic line.
Heavy Press Positioning
Leverage 11045 N of thrust at 0.9 MPa to move heavy jigs into final position while using the rear stop for fine-tuning.
Variable End-Stop Actuation
Set precise end-of-stroke limits for multi-tiered material forming processes that require different stroke lengths on the same tool.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X275-100S the Right Cylinder?
Select this 125 mm bore when an application requires heavy thrust (6136 N at 0.5 MPa) alongside variable end-stops, avoiding the rigid fixed travel of a standard SAI cylinder. If your force requirements are lower, stepping down to a 100 mm bore yields 3927 N at 0.5 MPa, whereas moving up to a 160 mm bore provides 10053 N for extreme loads. For this 275 mm stroke, external guiding is recommended to manage side loads on the rod.
As a dimensionally interchangeable ISO 15552 cylinder, it matches standard bore, stroke, and PT port footprints. The SAIJ mounting set includes Basic, FA, LB, TC, FTC, TCM1, and TCM2 (omitting FB, CA, CB, and CR). Because the adjuster only trims travel, load-holding without live pressure requires a SAIL or BSAI variant, or an external rod lock.
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 SAIJ125X275-100S FAQ
The rear adjuster acts as an external stop that lets you shorten the effective travel from 275 mm down to 175 mm. It sets the end position and aids deceleration, but it does not lock the load without live air pressure.
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.
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