Airtac SAIJ125 Adjustable Cylinder SAIJ125AX250-100S
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125AX250-100S is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 250mm 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
- Stroke250 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX250-100S
The AirTAC SAIJ125X250-100-S is a double-acting ISO 15552 profile cylinder featuring a rear mechanical stopper that allows you to shorten the effective stroke. With a 250mm nominal stroke and a 100mm adjustment range, you gain a usable travel window of 150-250mm to perfectly dial in end positions without swapping hardware. It delivers 6136N of pull force at 0.5 MPa and uses a SUS420J2 stainless steel rod for enhanced corrosion resistance.
This unit includes a piston magnet for position sensing, supporting AirTAC CMSE reed and DMSE electronic solid-state switches. The extruded aluminum barrel provides sensor grooves on both sides, and the rear adjuster functions strictly as a travel stop to decelerate the load, not as a lock. For holding loads without live air pressure, consider the SAIL or BSAI series instead.
Airtac SAIJ125 Adjustable Cylinder SAIJ125AX250-100S Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125AX250-100S |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 250 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 SAIJ125AX250-100S
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×250 | 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 SAIJ125AX250-100S Is Used
Product Changeover
Rapidly reconfigure the 150-250mm travel window for different package sizes on a packaging line without disassembling the cylinder mounts.
Machine Setup
Fine-tune the exact end-of-stroke position during commissioning to prevent crashes and ensure precise mechanical stops.
Heavy Forming Press
Leverage the 6136N pull force to actuate heavy press assemblies while using the rear stopper to dial in the forming depth.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX250-100S the Right Cylinder?
Selecting this 125mm bore over a 100mm version steps your thrust up significantly from 3681N to 6136N pull force at 0.5 MPa, making it suitable for heavier actuation demands. The adjustable stroke is ideal for production lines running multiple product sizes, as the end-stop can be fine-tuned on the fly during changeovers. It uses a PT tapered G1/2 port and the standard SAIJ mounting set (Basic, FA, LB, TC, FTC, TCM1, TCM2), omitting FB and rear pivot options.
When replacing an ISO 15552 cylinder, match the 125mm bore, 250mm stroke, 100mm adjustment, PT port, and -S magnet. Because the stroke is 250mm, ensure adequate guiding to prevent excessive side-loading on the M27x2 piston rod, as long unsupported strokes can induce binding even with robust rod diameters.
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 SAIJ125AX250-100S FAQ
At a standard 0.5 MPa operating pressure, this 125mm bore cylinder generates 6136N of pull force and 8590N of push force. It can deliver up to 11045N push force at 0.7 MPa.
The rear adjuster screw acts as a mechanical stop, allowing you to trim the 250mm nominal stroke back by up to 100mm. This creates a usable travel window of 150-250mm, which can be fine-tuned during setup without needing live air pressure to hold the position.
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 SAIJ125AX250-100S
Send us the quantity and destination. We confirm price, stock and lead time — usually within 7-8 hours.