Airtac SAIJ125 Adjustable Cylinder SAIJ125X30-20S
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125X30-20S is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 30mm 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
- Stroke30 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125X30-20S
The AirTAC SAIJ125X30-20-S is a double-acting, single-rod ISO 15552 profile cylinder equipped with a rear stroke adjuster. It delivers robust performance with a 6136N push force at 0.5 MPa, paired with a 32mm carbon steel rod and M27x2 thread. Because this SKU carries a 20mm adjustment code on a 30mm nominal stroke, technicians can fine-tune the retract end-position within a highly precise 10-30mm usable travel window.
This adjustable-stroke design eliminates the need to swap cylinders or bolt on external stops during product changeovers. It features a PT tapered port and includes a magnet (-S) for direct compatibility with AirTAC CMSE reed and DMSE electronic sensors. The extruded aluminum barrel incorporates sensor grooves on both sides, and the mounting hardware utilizes the standard SAIJ subset: Basic, FA, LB, TC, FTC, TCM1, and TCM2.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X30-20S Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X30-20S |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 30 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 SAIJ125X30-20S
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×30 | 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 SAIJ125X30-20S Is Used
Short-Stroke Pressing
Dial in the exact 10-30mm travel window for pressing or clamping operations where material thickness varies, ensuring perfect contact force every time.
Machine Changeover
Quickly readjust the retract end-position during product size changeovers on a packaging line without physically replacing the cylinder or adding shims.
Heavy Assembly Jigs
Leverage the 6136N push force to seat heavy components, using the rear stopper to fine-tune the final resting position safely.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X30-20S the Right Cylinder?
Choose this 125mm bore when an 80mm cylinder lacks thrust, as stepping up from the 80mm bore increases your 0.5 MPa push force from 2513N to 6136N. Conversely, if 2513N is sufficient, dropping to the 80mm bore saves physical space. The adjustable stroke is selected over a fixed SAI model when commissioning requires variable end-stops or exact short-stroke tuning without mechanical rework. For any application needing position holding without live air pressure, note that this rear adjuster acts only as a travel stop, not a lock; you would need to specify a SAIL or BSAI cylinder instead.
When replacing an ISO 15552 cylinder, verify the 125mm bore, 30mm nominal stroke, 20mm adjustment range, PT port thread, and the required -S magnet. The carbon steel rod handles high side loads well, but even with a 32mm diameter, any long unsupported stroke still requires an external guide. Operating speed for this bore is 30-500 mm/s.
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 SAIJ125X30-20S FAQ
At 0.5 MPa operating pressure, this 125mm bore cylinder provides 6136N of push force and 5734N of pull force. At 0.7 MPa, the push force increases to 8590N.
The rear adjusting screw allows you to trim the effective stroke back by up to 20mm. Since the nominal stroke is 30mm, this creates a usable travel window of 10-30mm, letting you set the exact end-position at commissioning without changing the cylinder.
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