Airtac SAIJ125 Adjustable Cylinder SAIJ125AX270-40S
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125AX270-40S is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 270mm 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
- Stroke270 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX270-40S
The AirTAC SAIJ125X270-40-S is a double-acting ISO 15552 profile cylinder equipped with a rear stroke adjuster, allowing you to dial back the nominal 270 mm travel by up to 40 mm for a precise 230-270 mm usable window. It delivers robust thrust, pushing 6136 N and pulling 5734 N at 0.5 MPa, scaling up to 11045 N at 0.9 MPa. This bore size features a 32 mm rod with an M27x2 thread, utilizing PT tapered port threads on its G1/2 connections.
This configuration includes a SUS420J2 stainless steel rod (material code A) for enhanced corrosion resistance and a built-in magnet for position sensing. The magnet is fully compatible with AirTAC CMSE reed and DMSE electronic solid-state switches, which seat neatly into the dual-sided sensor grooves on the extruded aluminum barrel. The rear adjuster acts purely as a mechanical stop to fine-tune the retract end position during commissioning; it does not lock or hold the load without live air pressure.
Airtac SAIJ125 Adjustable Cylinder SAIJ125AX270-40S Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125AX270-40S |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 270 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 SAIJ125AX270-40S
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×270 | 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 SAIJ125AX270-40S Is Used
Variable End-Stop Tuning
Dial in the retract position within the 230-270 mm window during machine setup to perfectly align pushing forces without machining new hard stops.
Product Size Changeover
Quickly adjust the effective stroke by up to 40 mm to accommodate different package lengths on a packaging line, minimizing downtime between production runs.
Sensitive Pressing Operations
Leverage the 6136 N thrust at 0.5 MPa to seat components accurately, using the rear screw to fine-tune the final contact position without altering the pneumatic pressure.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX270-40S the Right Cylinder?
Choose this 125 mm bore when an 80 mm bore falls short—delivering 2513 N push at 0.5 MPa versus this model's 6136 N—or step up to a 160 mm bore for 10053 N in heavier material handling. An adjustable stroke is selected over a fixed SAI cylinder when a machine requires variable end stops to accommodate product size changeovers without physically swapping the cylinder or adding external stopper blocks. For load-holding without continuous air pressure, this standard adjuster will not act as a brake; you must look to the SAIL (air-released lock) or BSAI (clamp-lock) series instead.
When matching this ISO 15552 cylinder for a replacement, verify the 125 mm bore, 270 mm nominal stroke, 40 mm adjustment range, PT port threads, and the -S magnet requirement. Because the 270 mm stroke exceeds 300 mm only marginally, it remains within standard limits, but any long unsupported stroke still necessitates an external guide to prevent rod side-loading and premature seal wear. The SAIJ mounting set includes Basic, FA, LB, TC, FTC, TCM1, and TCM2 options, 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 SAIJ125AX270-40S FAQ
At 0.5 MPa operating pressure, this 125 mm bore cylinder provides 6136 N of push force and 5734 N of pull force. At the maximum operating pressure of 0.9 MPa, the push force increases to 11045 N.
The rear mechanical adjuster allows you to shorten the 270 mm nominal stroke by up to 40 mm, creating a usable travel window of 230 to 270 mm. This stopper fine-tunes the end position at commissioning but does not hold the load without live air pressure.
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