Airtac SAIJ125 Adjustable Cylinder SAIJ125X185-40S
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125X185-40S is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 185mm 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
- Stroke185 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125X185-40S
The AirTAC SAIJ125X185-40-S is a double-acting, single-rod ISO 15552 profile cylinder equipped with a rear stroke adjuster. It delivers 6136N of push force at 0.5 MPa and provides a usable travel window of 145 to 185mm, allowing you to trim up to 40mm of stroke during commissioning. This eliminates the need to physically swap cylinders or bolt on external stops when finalizing end positions.
Built with a standard carbon steel rod and a -S magnet, it supports AirTAC CMSE reed and DMSE electronic sensors via dual-sided sensor grooves on the extruded aluminum barrel. The PT tapered port thread and integrated variable air cushions at both ends ensure reliable sealing and smooth deceleration across its 30-500mm/s operating speed range.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X185-40S Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X185-40S |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 185 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 SAIJ125X185-40S
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×185 | 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 SAIJ125X185-40S Is Used
Machine Changeover
Dial in the 145-185mm travel window during product size transitions without disassembling the actuator or adding external mechanical stops.
End-Position Tuning
Fine-tune the final retract position during commissioning to absorb mechanical tolerances and achieve precise clamping or pressing distances.
Heavy Forming Setup
Leverage the 6136N thrust at 0.5MPa for heavy pressing tasks while retaining the flexibility to shorten the stroke by up to 40mm for different tooling heights.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X185-40S the Right Cylinder?
Choose this 125mm bore when a 100mm cylinder (providing 3927N push at 0.5MPa) is insufficient, but a 160mm bore (10053N) would be excessive overkill. The adjustable 145-185mm window is highly advantageous for product changeovers on a packaging line, where you can simply dial in the new end-stop distance rather than replacing the entire actuator. For dimensionally interchangeable ISO 15552 replacements, match the 125mm bore, 185mm stroke, PT G1/2 port, 40mm adjustment, and -S magnet, noting the SAIJ mounting set is limited to Basic, FA, LB, TC, FTC, TCM1, and TCM2 (omitting FB, CA, CB, and CR). Since the 185mm stroke is under 300mm, side-load stress on the M27x2 rod thread is manageable without an external guide, though long unsupported loads still require one. Remember that the rear adjuster acts only as a travel stop, not a lock; for load-holding without live air pressure, select an AirTAC SAIL or BSAI cylinder.
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 SAIJ125X185-40S FAQ
At 0.5 MPa operating pressure, this 125mm bore cylinder provides 6136N of push force and 5734N of pull force. At the maximum 1.0 MPa pressure, it delivers up to 1251 kgf of push force.
The rear external screw stopper allows you to shorten the effective stroke from the nominal 185mm down to a minimum of 145mm. This creates a 145-185mm adjustable travel window for fine-tuning end positions at commissioning, but it acts only as a stop and does not lock the load without live air pressure.
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