Airtac SAIJ125 Adjustable Cylinder SAIJ125X250-20S
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125X250-20S 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 SAIJ125X250-20S
The AirTAC SAIJ125X250-20-S is a double-acting, single-rod ISO 15552 profile cylinder equipped with a rear stroke adjuster. It delivers a robust 6136 N push force at 0.5 MPa, making it suitable for heavy-duty operations. The integrated -S magnet enables precise position detection using AirTAC CMSE reed or DMSE electronic solid-state sensors housed within the dual-side barrel grooves.
With a 250 mm nominal stroke and a 20 mm adjustment range, this model provides a usable travel window of 230 to 250 mm. This allows you to dial in the exact retract end-position during commissioning without swapping the cylinder or adding external stops. The carbon steel piston rod features an M27x2 thread, and the cylinder uses a PT tapered port, ensuring high structural integrity and side-load resistance.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X250-20S Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X250-20S |
|---|---|
| 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 SAIJ125X250-20S
| 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 SAIJ125X250-20S Is Used
Machine Changeover
Quickly dial in the 230 to 250 mm retract position when switching product sizes on a packaging line, eliminating the need for custom physical spacers.
Heavy Duty Clamping
Leverage the 6136 N push force at 0.5 MPa to securely clamp large workpieces, using the rear stopper to fine-tune the exact clamping depth.
End-Stop Calibration
Precisely set the end-of-stroke position during machine commissioning, using the 20 mm adjustment screw to compensate for mechanical tolerances.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X250-20S the Right Cylinder?
Select this 125 mm bore cylinder when an application demands high thrust that exceeds the 3927 N push force of a 100 mm bore at 0.5 MPa, but does not require the extreme 10053 N output of a 160 mm bore. The adjustable 230 to 250 mm travel window is perfect for product changeovers on a line, allowing operators to fine-tune the retract distance on the fly instead of machining custom spacers. Remember that the rear adjuster functions strictly as a travel stop, not a lock; the cylinder cannot hold a load without live air. For dead-load holding, consider an AirTAC SAIL or BSAI cylinder.
To replace an ISO 15552 cylinder, match the 125 mm bore, 250 mm stroke, 20 mm adjustment, PT G1/2 port, and -S magnet. Mounting options include Basic, FA, LB, TC, FTC, TCM1, and TCM2. Since the 250 mm stroke is moderately long, ensure external guiding is used to prevent excessive rod side-loading, and note the operating speed is 30-500 mm/s for this bore size.
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 SAIJ125X250-20S FAQ
At 0.5 MPa, 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 acts as an external stopper, allowing you to shorten the effective stroke within a 230 to 250 mm window. It only sets the travel end and does not lock the load without continuous air pressure.
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 SAIJ125X250-20S
Send us the quantity and destination. We confirm price, stock and lead time — usually within 7-8 hours.