Airtac SAIJ125 Adjustable Cylinder SAIJ125X165-40S
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125X165-40S is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 165mm 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
- Stroke165 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125X165-40S
The AirTAC SAIJ125X165-40-S is a double-acting ISO 15552 profile cylinder featuring a rear stroke adjuster that trims the nominal 165 mm travel back by up to 40 mm, yielding a precise 125-165 mm usable window. This on-board adjuster allows you to fine-tune the retract end position at commissioning without swapping the barrel or adding external stops. It delivers substantial thrust, offering 6136 N of pull force at 0.5 MPa.
Equipped with a magnet for position sensing, this unit works seamlessly with AirTAC CMSE reed and DMSE electronic solid-state switches fitted into the dual-side sensor grooves on the extruded aluminum barrel. The robust 32 mm carbon steel rod and M27x2 rod thread handle high side loads well, while the PT tapered port threads ensure a tight pneumatic seal. The variable air cushions at both ends absorb kinetic energy, though the adjuster acts strictly as a travel stop and does not hold the load without live air pressure.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X165-40S Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X165-40S |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 165 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 SAIJ125X165-40S
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×165 | 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 SAIJ125X165-40S Is Used
Machine Setup & Changeover
Dial in the exact retract position within the 125-165 mm window during line changeovers without disassembling the actuator or repositioning hard stops.
Variable Product Stops
Adjust the end-of-stroke position on the fly to accommodate different package sizes or panel widths on a modular conveyor line.
Press & Forming Tuning
Fine-tune the approach distance of heavy 125 mm bore tooling, leveraging 6136 N of pull force to set precise material contact points.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X165-40S the Right Cylinder?
Choose this 125 mm bore when you need heavy force capacity, as it provides 6136 N pull at 0.5 MPa, bridging the gap below the 160 mm bore (9425 N pull) and well above the 100 mm bore (3681 N pull). An adjustable stroke is selected over a fixed SAI when a machine requires variable end-stops to accommodate product-size changeovers or fine-tune positioning during setup. For load-holding without continuous air pressure, this cylinder is insufficient; the rear screw is a stop, not a lock, so you must specify a SAIL or BSAI series, or use an external pilot-operated check valve.
When replacing an ISO 15552 cylinder, match the 125 mm bore, 165 mm stroke, 40 mm adjustment range, PT port threads, and the -S magnet requirement. Supported SAIJ mounting options include Basic, FA, LB, TC, FTC, TCM1, and TCM2 (omitting FB, CA, CB, and CR). Operating speed is 30-500 mm/s. Because the 165 mm stroke is relatively short for this large bore, external side-load guides are less critical here than on longer strokes, but the rod diameter still dictates the need for proper alignment to prevent premature seal wear.
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 SAIJ125X165-40S FAQ
At 0.5 MPa operating pressure, this 125 mm bore cylinder provides 6136 N of pull force and 6136 N of push force. At the maximum 1.0 MPa pressure, it delivers up to 1251 kgf.
The rear adjuster screw acts as an external stop that shortens the effective travel from the nominal 165 mm down to as little as 125 mm. It sets the end position but does not lock or hold 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 SAIJ125X165-40S
Send us the quantity and destination. We confirm price, stock and lead time — usually within 7-8 hours.