Airtac SAIJ125 Adjustable Cylinder SAIJ125AX250-10S
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125AX250-10S is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 250mm 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
- Stroke250 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX250-10S
The AirTAC SAIJ125X250-10-S is a double-acting, single-rod ISO 15552 profile cylinder equipped with a rear stroke adjuster. It delivers 6136 N of push force at 0.5 MPa and features a 10 mm adjustment range, creating a precise 240-250 mm usable travel window for dialing in end positions during commissioning. This model includes a magnet for position sensing and uses a SUS420J2 stainless steel rod (code A) for enhanced corrosion resistance.
Unlike fixed-stroke alternatives, this rear screw stopper lets you fine-tune the retract end without swapping the cylinder or adding external stops. It supports speeds of 30-500 mm/s and uses PT tapered port threads. The extruded aluminum barrel integrates sensor grooves on both sides for flexible mounting of CMSE reed or DMSE electronic switches.
Airtac SAIJ125 Adjustable Cylinder SAIJ125AX250-10S Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125AX250-10S |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 250 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 SAIJ125AX250-10S
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×250 | 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 SAIJ125AX250-10S Is Used
Machine Setup & Changeover
Fine-tune the 240-250 mm travel window during product size changeovers without physically swapping out the cylinder or bolting on external stops.
Variable End-Stop Positioning
Dial in the exact retract position during initial commissioning using the 10 mm rear adjuster to perfectly align heavy 6136 N loads.
Heavy-Duty Assembly Lines
Leverage the robust SUS420J2 stainless rod and 125 mm bore force for pressing or lifting tasks on automated manufacturing equipment.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX250-10S the Right Cylinder?
Choose this 125 mm bore when an application requires heavy thrust (6136 N at 0.5 MPa) and exact end-position tuning. If your process needs less force, stepping down to a 100 mm bore yields 3927 N; if you need more, an 160 mm bore provides 10053 N. Select the SAIJ adjustable version over a fixed SAI when machine setups involve product changeovers that demand variable end stops rather than cylinder swaps.
For an exact ISO 15552 replacement, match the 125 mm bore, 250 mm stroke, 10 mm adjustment, PT port threads, and the -S magnet option. Note that the SAIJ mounting set is limited to Basic, FA, LB, TC, FTC, TCM1, and TCM2, omitting FB/CA/CB/CR. Because the stroke is 250 mm, ensure proper external guiding to prevent excessive side-loading on the rod. The rear adjuster acts only as a travel stop and does not hold the load without live air; for true locking, consider the SAIL or BSAI series.
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 SAIJ125AX250-10S FAQ
At 0.5 MPa operating pressure, this 125 mm bore cylinder generates 6136 N of push force and 5734 N of pull force. It can reach a maximum push force of 11045 N at 0.9 MPa.
The rear adjuster screw allows you to shorten the 250 mm nominal stroke by up to 10 mm, providing a usable travel window of 240-250 mm. This stopper only sets the travel end and does not lock the load without live air pressure.
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