Airtac SAIJ125 Adjustable Cylinder SAIJ125X850-75
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125X850-75 is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 850mm 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
- Stroke850 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125X850-75
The AirTAC SAIJ125X850-75 is a double-acting ISO 15552 profile cylinder engineered for heavy-duty positioning. It features a robust 32mm carbon steel rod and delivers 6136N of pull force at 0.5 MPa. A rear stopper screw allows you to trim the effective travel back by up to 75mm, creating a precise 775-850mm usable stroke window for exact end-position tuning during commissioning.
Because the stroke extends to 850mm, the 32mm rod requires external guide support to prevent sagging and side-load damage. This model uses a PT tapered G1/2 port and omits the FB, CA, CB, and CR mounts, utilizing a focused set of ISO 15552 interfaces (Basic, FA, LB, TC, FTC, TCM1, TCM2). The rear adjuster acts solely as a travel stop, not a lock, so live air is required to hold the load.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X850-75 Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X850-75 |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 850 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 SAIJ125X850-75
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×850 | 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 SAIJ125X850-75 Is Used
Heavy-Duty Press Setups
Dial in the exact 775-850mm clamping position during machine commissioning without physically swapping out the entire cylinder body.
Product Size Changeovers
Quickly retract the end stop by up to 75mm to accommodate varying package lengths on automated packaging lines.
Large Assembly Jigs
Leverage the 6136N pull force to move heavy structural components while fine-tuning the final resting position on the fly.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X850-75 the Right Cylinder?
Select this 125mm bore when an 80mm cylinder (providing 2268N pull at 0.5 MPa) is too weak for your clamping or lifting demands. The 75mm adjustment range is ideal for production lines running mixed product sizes, allowing you to fine-tune the end stop without swapping cylinders or adding external shims. For operations needing true load-holding without continuous air pressure, use an SAIL or BSAI lock cylinder instead of relying on this stopper.
When replacing an ISO 15552 cylinder, match the 125mm bore, 850mm stroke, 75mm adjustment, PT G1/2 port, and the specific mounting interface. The long 850mm stroke dictates external guiding to manage side loads. This variant uses a standard carbon steel rod and lacks a magnet, so position sensing requires external switches rather than embedded CMSE or DMSE sensors.
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 SAIJ125X850-75 FAQ
A rear stopper screw lets you shorten the nominal 850mm stroke by up to 75mm, providing an adjustable 775-850mm travel window. This stopper only sets the end position and does not lock the load without live air pressure.
At 0.5 MPa, it provides 6136N of push force and 5734N of pull force. The operating speed range for this 125mm bore is 30-500 mm/s, supported by a 40mm air cushion at both ends.
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