Airtac SAIJ125 Adjustable Cylinder SAIJ125AX210-40S
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125AX210-40S is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 210mm 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
- Stroke210 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX210-40S
The AirTAC SAIJ125X210-40-S is a double-acting ISO 15552 profile cylinder featuring a rear-mounted stroke adjuster. It provides a usable travel window of 170 to 210 mm, allowing you to trim the nominal 210 mm stroke by up to 40 mm during machine setup. This bore size delivers 6136 N of push force and 5734 N of pull force at 0.5 MPa, making it suitable for heavy-duty positioning tasks.
This variant includes a SUS420J2 stainless steel rod (option A) for improved corrosion resistance and features a built-in magnet for use with CMSE reed or DMSE electronic sensors. The extruded aluminum barrel includes sensor grooves on both sides, and the unit uses PT tapered port threads. It supports a speed range of 30-500 mm/s and includes variable air cushions at both ends to manage deceleration.
Airtac SAIJ125 Adjustable Cylinder SAIJ125AX210-40S Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125AX210-40S |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 210 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 SAIJ125AX210-40S
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×210 | 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 SAIJ125AX210-40S Is Used
Machine Changeover
Dial in the exact 170 to 210 mm end-stop during product size transitions on a packaging line without changing the cylinder or adding external shims.
Heavy Press Positioning
Leverage the 6136 N push force at 0.5 MPa to seat heavy components, using the rear adjuster to compensate for material thickness variations.
Assembly Line Tuning
Fine-tune the retract stroke during commissioning to perfect the timing of a pick-and-place mechanism using the integrated CMSE/DMSE sensor feedback.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX210-40S the Right Cylinder?
Select this 125 mm bore cylinder when an application requires substantial force—delivering 6136 N at just 0.5 MPa—along with the flexibility to fine-tune the end-of-stroke position without swapping out physical components. If your process demands less force, stepping down to a 100 mm bore yields 3927 N of push force at the same pressure. The rear adjuster acts purely as a mechanical stop to set the travel limit; it does not lock the load or hold position without live air pressure. For fail-safe load holding, consider an AirTAC SAIL pneumatic lock or BSAI clamp-lock cylinder.
When replacing an ISO 15552 cylinder, match the 125 mm bore, 210 mm stroke, 40 mm adjustment range, PT port thread, and the -S magnet option. Because the 210 mm stroke exceeds 300 mm? No, but even at 210 mm, long unsupported strokes can generate leverage forces; ensure proper external guidance to prevent side-loading damage to the rod. The SAIJ mounting set includes Basic, FA, LB, TC, FTC, TCM1, and TCM2 options, omitting FB, CA, CB, and CR brackets.
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 SAIJ125AX210-40S 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 0.7 MPa, the push force increases to 8590 N.
The rear adjuster screw allows you to shorten the effective travel from the 210 mm nominal stroke down to a minimum of 170 mm. This creates a 170-210 mm adjustable window, acting as a mechanical stop to fine-tune end positions without replacing the cylinder.
Authorized Export Seller
Genuine AirTAC parts produced by AirTAC factory.
1-Year Warranty
Covers non-human-caused product damage.
Fast Dispatch
Standard models usually ship in 3-4 days.
Fast Reply
Most inquiries answered within 7-8 hours.
Related AirTAC SAI Cylinders
Request a Quote for Airtac SAIJ125 Adjustable Cylinder SAIJ125AX210-40S
Send us the quantity and destination. We confirm price, stock and lead time — usually within 7-8 hours.