Airtac SAIJ125 Adjustable Cylinder SAIJ125AX85-20
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125AX85-20 is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 85mm 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
- Stroke85 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX85-20
The AirTAC SAIJ125X85-20 is a double-acting ISO 15552 profile cylinder featuring a rear stroke adjuster. It provides a usable travel window of 65 to 85 mm, letting you dial back the nominal 85 mm stroke by up to 20 mm during machine commissioning. With a 125 mm bore, it generates 6136 N of push force and 5734 N of pull force at 0.5 MPa. The piston rod uses SUS420J2 stainless steel (code A) for improved corrosion resistance, and the PT tapered ports seal reliably.
This model omits the FB, CA, CB, and CR mountings, offering a reduced ISO 15552 interface set of Basic, FA, LB, TC, FTC, TCM1, and TCM2. The rear adjuster acts strictly as a travel stop to fine-tune deceleration; it does not hold the load without live air pressure. For position holding without continuous air, consider an external rod lock or the SAIL and BSAI series.
Airtac SAIJ125 Adjustable Cylinder SAIJ125AX85-20 Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125AX85-20 |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 85 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 SAIJ125AX85-20
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×85 | 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 SAIJ125AX85-20 Is Used
Product Changeovers
Dial in the 65-85 mm travel window during line changeovers to accommodate different part sizes without physically swapping out the cylinder.
Press Fit Tuning
Use the rear stopper to fine-tune the pressing depth of heavy assemblies, leveraging the 6136 N push force for secure seating.
Assembly End-Stops
Establish a precise, repeatable end-of-stroke position during machine setup, relying on the stop rather than adding external hard stops.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX85-20 the Right Cylinder?
Choose this 125 mm bore cylinder when an application requires substantial thrust (6136 N push at 0.5 MPa) but demands on-site end-position tuning, avoiding the need to swap cylinders during product changeovers. If your process requires less force, stepping down to an 80 mm bore yields 2513 N push at 0.5 MPa. The 32 mm rod thread and M27x2 rod thread handle high side loads well, but because the 85 mm stroke is relatively short for this bore, external guiding is less critical than on longer strokes.
An adjustable stroke is selected over a fixed SAI cylinder when a machine builder needs a variable end-stop to accommodate minor dimensional variances without adding external stops. To match this ISO 15552 replacement: specify 125 mm bore, 85 mm nominal stroke, 20 mm adjustment, PT ports, the reduced mounting set, and no magnet (-S omitted).
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 SAIJ125AX85-20 FAQ
The rear adjuster allows you to shorten the effective travel by up to 20 mm. This creates a usable stroke window of 65 to 85 mm, enabling fine-tuning of the end position at commissioning without changing the cylinder.
At 0.5 MPa, it provides 6136 N of push force and 5734 N of pull force. At 0.7 MPa, the push force increases to 8590 N.
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 SAIJ125AX85-20
Send us the quantity and destination. We confirm price, stock and lead time — usually within 7-8 hours.