Airtac SAIJ125 Adjustable Cylinder SAIJ125X65-50S
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125X65-50S is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 65mm 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
- Stroke65 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125X65-50S
The AirTAC SAIJ125X65-50-S is a double-acting, single-rod ISO 15552 profile cylinder equipped with a rear stroke adjuster. It delivers a robust 6136N pull force at 0.5 MPa and features a PT tapered port thread. The integrated -S magnet enables direct compatibility with CMSE reed and DMSE electronic sensors for precise position detection.
This specific SKU provides a 15-65 mm usable travel window, allowing you to dial back the nominal 65 mm stroke by up to 50 mm. The external rear stopper screw lets you fine-tune the retract end-position during commissioning or product changeover without swapping the cylinder or adding external stops. The adjuster acts purely as a travel stop and works alongside the 40 mm variable air cushions at both ends to decelerate the load.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X65-50S Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X65-50S |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 65 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 SAIJ125X65-50S
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×65 | 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 SAIJ125X65-50S Is Used
Product Changeover
Dial in the retract position from 15 to 65 mm instantly when switching product sizes on a packaging line, eliminating the need to physically swap cylinders.
End-Stop Tuning
Fine-tune the final end-position during machine commissioning using the rear screw, ensuring precise mechanical alignment without external shims.
High-Force Positioning
Leverage the 6136N pull force to shift heavy pallets or fixtures, relying on the adjustable stopper to set the exact travel limit per batch.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X65-50S the Right Cylinder?
Choose this 125 mm bore when a 100 mm bore (providing 3681N pull at 0.5 MPa) lacks the necessary force, but a 160 mm bore is oversized. The adjustable 15-65 mm travel window is ideal for machines requiring variable end-stops during format changes. Because the stroke is short, side-loading is minimal, but the 32 mm carbon steel rod and M27x2 thread provide high rigidity. Remember that the rear adjuster is a stop, not a lock; for load-holding without live air pressure, select an SAIL or BSAI cylinder. This SAIJ model uses the reduced mounting set (Basic, FA, LB, TC, FTC, TCM1, TCM2) and is dimensionally interchangeable per ISO 15552.
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 SAIJ125X65-50S FAQ
At 0.5 MPa operating pressure, this 125 mm bore cylinder provides 6136N of pull force and 8590N of push force. It can deliver a maximum push force of 11045N at 0.9 MPa.
The rear adjuster screw lets you shorten the effective travel from the 65 mm nominal stroke down to 15 mm, creating a 15-65 mm usable window. It functions as a mechanical stop to set the end position and does not lock the load without live air pressure.
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