Airtac SAIJ125 Adjustable Cylinder SAIJ125X400-10S
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125X400-10S is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 400mm 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
- Stroke400 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125X400-10S
The AirTAC SAIJ125X400-10-S is a double-acting ISO 15552 profile cylinder featuring a rear stroke adjuster that allows you to fine-tune the retract end-position by up to 10 mm. This specific SKU creates a 390-400 mm usable travel window, letting you dial in the exact retract distance during commissioning without adding external stops. The 125 mm bore delivers substantial thrust, generating 6136 N of pull force and 8590 N of push force at 0.5 MPa.
Equipped with a magnet for position sensing, this model works seamlessly with AirTAC CMSE reed and DMSE electronic solid-state switches housed in the dual-side sensor grooves of the extruded aluminum barrel. The carbon steel piston rod utilizes an M27x2 thread, and the cylinder operates at speeds of 30-500 mm/s. The rear adjustment screw acts purely as a travel stop to set deceleration and end-position, meaning it will not hold a load without live air pressure.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X400-10S Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X400-10S |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 400 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 SAIJ125X400-10S
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×400 | 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 SAIJ125X400-10S Is Used
Variable End-Stop Machining
Fine-tune the 390-400 mm retract position on the fly to accommodate different part lengths without physically swapping out the cylinder.
Product Changeover Lines
Rapidly adjust the stroke end-position by up to 10 mm during machine setup when switching between product variants on high-force assembly equipment.
Heavy Material Placement
Leverage the 6136 N pull force to push heavy pallets or workpieces into a fixture, using the rear stop to dial in the exact contact position.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X400-10S the Right Cylinder?
Choose this 125 mm bore adjustable-stroke cylinder when your equipment requires high force combined with variable end-stop positioning, such as accommodating slight product size changes on a line. If your application needs less force, stepping down to a 100 mm bore yields 3681 N of pull at 0.5 MPa, whereas moving up to a 160 mm bore provides 9425 N of pull. The SAIJ125X400-10-S is dimensionally interchangeable per ISO 15552, using a PT tapered G1/2 port and a reduced mounting set (Basic, FA, LB, TC, FTC, TCM1, TCM2).
Because this model features a 400 mm stroke, the M27x2 rod and carbon steel piston assembly require external guiding to prevent excessive side-loading and premature seal wear. The 10 mm rear adjuster is strictly a mechanical stop for end-position tuning, not a locking device; for true load-holding without live air, select a SAIL (air-released lock) or BSAI (clamp-lock) cylinder instead.
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 SAIJ125X400-10S FAQ
At 0.5 MPa operating pressure, this 125 mm bore cylinder generates 6136 N of pull force and 8590 N of push force. The maximum push force reaches 11045 N at 0.9 MPa.
The rear adjusting screw lets you shorten the effective 400 mm stroke by up to 10 mm, providing a 390-400 mm usable travel window. The adjuster functions as a mechanical stop for end-position tuning and deceleration, but it does not lock or hold the load without continuous air pressure.
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