Airtac SAIJ125 Adjustable Cylinder SAIJ125X85-50S
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125X85-50S 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 SAIJ125X85-50S
The AirTAC SAIJ125X85-50-S is a double-acting ISO 15552 profile cylinder equipped with a rear stroke adjuster, designed for applications requiring precise end-position tuning. It delivers a robust 6136N pull force at 0.5MPa, making it suitable for heavy-duty operations. The integrated -S magnet enables seamless compatibility with CMSE reed and DMSE electronic sensors for exact position feedback.
This model features a nominal 85mm stroke that can be dialed back by up to 50mm, providing a usable travel window of 35-85mm. Unlike a fixed-stroke SAI cylinder, the external rear stopper allows you to fine-tune the retract end-position during commissioning or product changeover without adding external stops. The adjuster acts purely as a travel stop and does not hold the load without live air pressure; for load-holding, consider SAIL or BSAI cylinders.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X85-50S Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X85-50S |
|---|---|
| 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 SAIJ125X85-50S
| 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 SAIJ125X85-50S Is Used
Variable End-Stop Clamping
Ideal for clamping parts of varying widths, using the 35-85mm travel window to adjust the retract position precisely without swapping out the entire cylinder.
Machine Changeover
Speeds up production line changeovers by allowing operators to dial in the exact end-position via the rear screw rather than repositioning physical hard stops.
Sensor-Verified Positioning
Pairs with CMSE reed and DMSE electronic sensors via the -S magnet to confirm stroke endpoints during fine-tuning and automated heavy-duty cycles.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X85-50S the Right Cylinder?
Selecting this 125mm bore over a smaller 100mm option steps the thrust up significantly, offering 6136N pull force at 0.5MPa compared to the 100mm bore's 3681N. The 50mm adjustment range is particularly beneficial on production lines that frequently process different product sizes, allowing operators to set variable end-stops on the fly. To match this ISO 15552 cylinder exactly for a replacement, verify the 85mm nominal stroke, 50mm adjustment, PT tapered port threads, carbon steel rod, and the -S magnet option.
Because the 85mm stroke is relatively short for this large bore, side-loading concerns are minimal, but the substantial 32mm rod and M27x2 thread provide excellent rigidity. Remember that neither the rear adjuster nor the adjustable air cushions at both ends function as a lock; if the air supply drops, the cylinder will not hold its position. For true fail-safe load holding without live air, explore AirTAC SAIL or BSAI series cylinders.
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 SAIJ125X85-50S FAQ
This 125mm bore cylinder provides 6136N of pull force and 8590N of push force at 0.5MPa. At 0.7MPa, the push force increases to 8590N, offering substantial power for heavy industrial applications.
The rear adjuster acts as a mechanical stopper that lets you shorten the effective travel from the nominal 85mm down to as little as 35mm. This creates a 35-85mm usable window for fine-tuning end positions at commissioning, but it does not lock the load when air is removed.
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