Airtac SAIJ125 Adjustable Cylinder SAIJ125BX35-20S
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125BX35-20S is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 35mm 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
- Stroke35 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
- No minimum order. A single piece can be ordered.
- Ready in 3–5 business days. That is the time we take to process the order and hand it to the carrier. Transit time after that depends on the destination.
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125BX35-20S
The AirTAC SAIJ125X35-20-S is a double-acting ISO 15552 profile cylinder equipped with a rear stroke adjuster, delivering robust thrust for heavy-duty automation. It features a 125 mm bore, generating 6136 N of pull force at 0.5 MPa and a maximum of 1251 kgf at 1.0 MPa. The integrated -20 adjustment mechanism allows the 35 mm nominal stroke to be fine-tuned down to a 15 mm effective travel, providing a precise 15-35 mm usable window for exact end-position calibration during commissioning.
This model incorporates a SUS304 stainless steel piston rod (option B) for superior corrosion resistance in harsh environments. An integrated magnet (-S) enables position sensing with AirTAC CMSE reed and DMSE electronic solid-state switches, which mount directly into the extruded aluminum barrel's dual sensor grooves. Unlike fixed-stroke SAI cylinders, this adjustable variant eliminates the need to swap hardware or add external stops when dialing in a specific end-of-stroke position.
Airtac SAIJ125 Adjustable Cylinder SAIJ125BX35-20S Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125BX35-20S |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 35 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 SAIJ125BX35-20S
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×35 | 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 SAIJ125BX35-20S Is Used
Machine Setup Calibration
Dial in the exact 15-35 mm travel window during commissioning without physically swapping cylinders or adding external stopper blocks.
Product Size Changeover
Quickly adapt the end-stop position on a production line when switching between different product sizes or packaging formats.
High-Force Positioning
Leverage the 1251 kgf maximum thrust and SUS304 rod for heavy-duty positioning tasks requiring precise stroke limits in harsh environments.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125BX35-20S the Right Cylinder?
Selecting this 125 mm bore cylinder is ideal when an application demands high force (6136 N pull at 0.5 MPa) and exact end-position tuning. If your force requirements are lower, stepping down to a 100 mm bore yields 3681 N of pull force at 0.5 MPa, while moving up to a 160 mm bore provides 9425 N. Choose the SAIJ adjustable-stroke design over a fixed SAI when you need a variable end-stop for product changeovers or setup fine-tuning. Remember that the rear adjuster acts purely as a travel stop and does not hold the load without live air; for true load-holding without pressure, consider an SAIL or BSAI cylinder.
For ISO 15552 replacement matching, verify this cylinder's 125 mm bore, 35 mm stroke, -20 adjustment range, PT tapered port threads, and the -S magnet option. The SAIJ series utilizes a reduced mounting subset of Basic, FA, LB, TC, FTC, TCM1, and TCM2, omitting FB, CA, CB, and CR mounts. Although the 32 mm diameter rod and M27x2 thread handle high axial loads well, always support any long-stroke application with an external guide to prevent side-load damage.
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 SAIJ125BX35-20S FAQ
At 0.5 MPa, this 125 mm bore cylinder provides 6136 N of push force and 1402 N of pull force (accounting for the rod). At the maximum operating pressure of 1.0 MPa, it delivers up to 1251 kgf.
The rear adjuster screw allows you to shorten the 35 mm nominal stroke by up to 20 mm, creating a 15-35 mm usable travel window. This stopper fine-tunes the end position but does not lock or hold the load without continuous air pressure.
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