Airtac SAIJ125 Adjustable Cylinder SAIJ125X155-75S
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125X155-75S is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 155mm 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
- Stroke155 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125X155-75S
The AirTAC SAIJ125X155-75-S is a double-acting ISO 15552 profile cylinder equipped with a rear stroke adjuster, enabling you to dial back the travel to establish a precise 80-155 mm usable window during commissioning. Operating at 0.5 MPa, it delivers 6136 N of push force and 5734 N of pull force, making it well-suited for heavy-duty positioning tasks. The standard carbon steel rod and PT tapered port threads are configured for robust industrial integration.
This unit includes a magnet for CMSE reed and DMSE solid-state sensors, which mount directly into the dual-side extruded aluminum barrel grooves. The rear adjustment screw acts strictly as a travel stop to fine-tune the end position without swapping the cylinder, while the built-in variable air cushions handle deceleration. It is important to note that neither the adjuster nor the cushions function as a lock; live air pressure is required to hold the load, so an external rod lock or a SAIL cylinder is needed for position holding without pressure.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X155-75S Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X155-75S |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 155 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 SAIJ125X155-75S
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×155 | 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 SAIJ125X155-75S Is Used
Machine Setup Changeover
Quickly fine-tune the retract end position within the 80-155 mm window during product size changeovers without swapping out the entire cylinder assembly.
Heavy-Duty Positioning
Leverage the 6136 N push force at 0.5 MPa to move heavy pallets or fixtures, using the rear stopper to set the exact resting coordinate.
Variable End-Stop Assembly
Establish a precise, repeatable end-of-stroke for assembly presses, relying on the 40 mm cushion length to safely decelerate the 30-500 mm/s travel speed.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X155-75S the Right Cylinder?
Choose this SAIJ125 model when a 125 mm bore is required to handle loads up to 6136 N at 0.5 MPa, but the application demands a variable end-stop rather than a fixed 155 mm stroke. If your force requirements are lower, stepping down to a 100 mm bore yields 3927 N of push force, while stepping up to a 160 mm bore provides 10053 N for heavier loads. The 75 mm adjustment range is particularly useful for product changeovers on a line, allowing operators to reposition the end-of-stroke without adding external stops.
When replacing an ISO 15552 cylinder, match the 125 mm bore, 155 mm nominal stroke, 75 mm adjustment range, PT port threads, and the -S magnet option. The SAIJ series supports a reduced mounting set including Basic, FA, LB, TC, FTC, TCM1, and TCM2, but omits FB, CA, CB, and CR brackets. Because the 155 mm stroke is below the 300 mm side-load threshold, standard mounting is acceptable, though long unsupported strokes still necessitate an external guide.
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 SAIJ125X155-75S FAQ
At 0.5 MPa, this 125 mm bore cylinder provides 6136 N of push force and 5734 N of pull force. If higher pressure is available, it can deliver up to 8590 N of push force at 0.7 MPa.
The rear adjusting screw acts as a mechanical stopper that lets you trim the effective travel back by up to 75 mm. This creates a usable stroke window of 80 to 155 mm, allowing you to fine-tune the end position at commissioning without changing the cylinder.
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 SAIJ125X155-75S
Send us the quantity and destination. We confirm price, stock and lead time — usually within 7-8 hours.