Airtac SAIJ125 Adjustable Cylinder SAIJ125BX85-75S
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125BX85-75S 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
- No minimum order. A single piece can be ordered.
- Ready in 3–5 business days. That is the time we take to process the order and hand it to the carrier. Transit time after that depends on the destination.
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125BX85-75S
The AirTAC SAIJ125X85-75-S is a double-acting ISO 15552 profile cylinder featuring a rear stroke adjuster. It provides a nominal 85 mm stroke that can be dialed back by up to 75 mm, creating a flexible 10-85 mm usable travel window for precise end-position tuning. Delivering 6136 N of push thrust at 0.5 MPa, this bore size handles heavy loads. The extruded aluminum barrel includes sensor grooves on both sides, and the -S option provides a magnet for solid-state DMSE or reed CMSE switches.
This unit uses a SUS304 stainless steel rod (option B) for superior corrosion resistance in harsh environments. It operates at 30-500 mm/s and features PT tapered port threads. The rear adjuster acts purely as a mechanical stop to set the travel end and does not hold the load without live air pressure. For load-holding requirements without continuous air, consider the SAIL or BSAI series instead.
Airtac SAIJ125 Adjustable Cylinder SAIJ125BX85-75S Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125BX85-75S |
|---|---|
| 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 SAIJ125BX85-75S
| 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 SAIJ125BX85-75S Is Used
Variable End-Stop Positioning
Dial in the exact 10-85 mm travel distance during setup to accommodate varying material thicknesses without adding external mechanical stops.
Product Size Changeovers
Quickly shorten the cylinder's effective stroke on packaging lines when switching to a different product size, minimizing machine downtime.
Heavy-Duty Machine Setup
Leverage the 6136 N push force at 0.5 MPa for heavy clamping or lifting tasks, fine-tuning the retract position to match tooling.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125BX85-75S the Right Cylinder?
Select this 125 mm bore when 50 mm (982 N push at 0.5 MPa) is insufficient but 160 mm (10053 N) is oversized. An adjustable stroke is chosen over a fixed SAI cylinder when a machine requires commissioning fine-tuning or variable end-stops for product changeovers. Because the stroke is 85 mm (under 300 mm), side-loading is less critical, but the 32 mm rod and M27x2 thread provide robust resistance to minor deflection. The SAIJ mounting set includes Basic, FA, LB, TC, FTC, TCM1, and TCM2, omitting FB, CA, CB, and CR.
To match this ISO 15552 cylinder as a replacement, verify the 125 mm bore, 85 mm nominal stroke, 75 mm adjustment range, PT port threads, and the -S magnet. The rear adjuster is a travel stop, not a lock; it relies on the variable air cushions at both ends for end-of-stroke deceleration. If the application needs to hold position safely without live air, use an external rod lock or pilot-operated check valve.
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 SAIJ125BX85-75S FAQ
At 0.5 MPa operating pressure, this 125 mm bore cylinder provides 6136 N of push force and 5734 N of pull force. At the maximum 1.0 MPa pressure, it delivers 1251 kgf.
The rear adjusting screw acts as a mechanical stop, allowing you to trim the nominal 85 mm stroke back by up to 75 mm. This creates a usable travel window of 10-85 mm for precise commissioning without replacing the cylinder.
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