Airtac SAIJ125 Adjustable Cylinder SAIJ125AX25-20
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125AX25-20 is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 25mm 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
- Stroke25 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX25-20
The AirTAC SAIJ125X25-20 is a double-acting ISO 15552 profile cylinder equipped with a rear stroke adjuster, delivering 6136N of push force at 0.5 MPa. It features a SUS420J2 stainless steel rod and PT tapered ports. This specific configuration provides a usable travel window of 5-25mm, allowing you to dial back the nominal 25mm stroke by up to 20mm during commissioning.
Because the adjuster acts purely as a mechanical stop, it cannot hold a load without continuous live air; for pneumatic locking requirements, consider the SAIL or BSAI series. This model omits FB, CA, CB, and CR mounts, utilizing a reduced ISO 15552 mounting set (Basic, FA, LB, TC, FTC, TCM1, TCM2) and operates at speeds of 30-500mm/s.
Airtac SAIJ125 Adjustable Cylinder SAIJ125AX25-20 Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125AX25-20 |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 25 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 SAIJ125AX25-20
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×25 | 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 SAIJ125AX25-20 Is Used
Short-Stroke Clamping
Ideal for high-force clamping stations where the exact 5-25mm travel distance must be fine-tuned on the machine to accommodate varying material thicknesses without changing the actuator.
Product Changeovers
Enables rapid line changeovers by allowing operators to simply turn the rear adjuster screw to shorten the stroke, rather than physically swapping out the entire cylinder for different product sizes.
End-Stop Calibration
Provides a mechanical means to precisely calibrate retract end positions during machine commissioning, ensuring critical components seat perfectly without relying on external stop blocks.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX25-20 the Right Cylinder?
Select this 125mm bore actuator when an application demands high thrust (6136N push at 0.5MPa) but requires minute end-position tuning within a very short 5-25mm travel window. If you need less force, stepping down to a 100mm bore yields 3927N push force, whereas fixed end-position applications without changeover needs are better served by the standard SAI series. To achieve an exact ISO 15552 replacement, match the 125mm bore, 25mm stroke, PT port thread, SUS420J2 rod material, and the chosen mounting hardware.
Although the 25mm stroke is short, the robust 32mm rod diameter handles substantial side loads. Remember that the rear adjuster screw only sets the retract end position and relies on the variable air cushion for deceleration; it functions as a stop, not a brake.
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 SAIJ125AX25-20 FAQ
At an operating pressure of 0.5 MPa, this 125mm bore cylinder generates a push force of 6136N and a pull force of 5734N. At 0.7 MPa, the push force increases to 8590N.
The rear adjusting screw allows you to mechanically shorten the nominal 25mm stroke by up to 20mm, creating a usable travel window of 5-25mm. This stopper sets the end position but does not lock the load without live 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 SAIJ125AX25-20
Send us the quantity and destination. We confirm price, stock and lead time — usually within 7-8 hours.