Airtac SAIJ125 Adjustable Cylinder SAIJ125AX500-40S
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125AX500-40S is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 500mm 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
- Stroke500 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX500-40S
The AirTAC SAIJ125X500-40-S is a double-acting ISO 15552 profile cylinder equipped with a rear stroke adjuster, enabling you to dial back the effective travel to a precise 460-500 mm window without adding external stops. It delivers a robust 6136 N push force at 0.5 MPa, scaling up to 11045 N at 0.9 MPa, making it suitable for heavy-duty positioning tasks. The standard PT G1/2 port and 32 mm SUS420J2 stainless steel rod (code A) provide excellent corrosion resistance and side-load durability.
Because this SKU includes a magnet (-S), it integrates seamlessly with AirTAC CMSE reed and DMSE solid-state sensors housed in the dual-side extruded barrel grooves. The rear adjustment mechanism acts purely as a mechanical travel stop to fine-tune the retract end position during commissioning; it does not lock or hold the load without live air pressure. For applications requiring true load-holding, consider the related SAIL or BSAI series.
Airtac SAIJ125 Adjustable Cylinder SAIJ125AX500-40S Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125AX500-40S |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 500 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 SAIJ125AX500-40S
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×500 | 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 SAIJ125AX500-40S Is Used
Variable End-Stop Positioning
Ideal for heavy presses or forming stations where the 460-500 mm retract position must be fine-tuned on the fly to accommodate different material thicknesses.
Machine Changeover Setup
Speeds up product line changeovers by allowing operators to dial in the exact end-stroke without disassembling tooling or swapping out the entire actuator.
Heavy-Duty Assembly Lines
Leverages 6136 N of thrust at 0.5 MPa to drive large components into place, while the SUS420J2 rod withstands harsh industrial environments.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX500-40S the Right Cylinder?
Selecting this 125 mm bore over a smaller 100 mm bore increases your 0.5 MPa thrust from 3927 N to 6136 N, providing ample power for high-inertia loads. The 40 mm adjustment range is ideal when you need to accommodate slight product size variations on a production line without physically swapping the cylinder. When matching an ISO 15552 replacement, verify your bore, 500 mm stroke, 40 mm adjustment, PT G1/2 port, and the -S magnet requirement.
With a 500 mm stroke, the 32 mm rod and standard air cushions require careful alignment to prevent excessive side-loading; always use an external guide rail for heavy loads. This cylinder supports a mounting subset of Basic, FA, LB, TC, FTC, TCM1, and TCM2. The variable air cushions at both ends decelerate the piston, but remember that neither the cushion nor the rear adjuster functions as a mechanical brake.
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 SAIJ125AX500-40S FAQ
At a 0.5 MPa operating pressure, this 125 mm bore cylinder provides 6136 N of push force and 5734 N of pull force. At 0.9 MPa, the push force increases to 11045 N.
The rear adjuster acts as a mechanical stop that lets you trim the effective travel back by up to 40 mm, creating a 460-500 mm usable stroke window. It is used for fine-tuning end positions at commissioning and does not hold the load without live air pressure.
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