Airtac SAIJ125 Adjustable Cylinder SAIJ125BX250-20
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125BX250-20 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
- No minimum order. A single piece can be ordered.
- Ready in 3–5 business days. That is the time we take to process the order and hand it to the carrier. Transit time after that depends on the destination.
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125BX250-20
The AirTAC SAIJ125X250-20 is a double-acting ISO 15552 profile cylinder equipped with a rear stroke adjuster, allowing you to dial back the 250 mm nominal travel by up to 20 mm. This yields a precise 230-250 mm usable end-position window, eliminating the need to swap hardware or bolt on external stops during product changeovers. It delivers substantial thrust, pushing 8590 N at 0.7 MPa and pulling 5734 N at 0.5 MPa.
This unit features a SUS304 stainless steel rod for superior corrosion resistance and utilizes PT tapered port threads. The extruded aluminum barrel includes sensor grooves on both sides for flexible switch mounting. It supports a speed range of 30-500 mm/s and relies on adjustable air cushions at both ends to decelerate the load smoothly.
Airtac SAIJ125 Adjustable Cylinder SAIJ125BX250-20 Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125BX250-20 |
|---|---|
| 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 SAIJ125BX250-20
| 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 SAIJ125BX250-20 Is Used
Product Size Changeover
Quickly reconfigure the 230-250 mm travel window on packaging lines when switching to different carton sizes, avoiding mechanical rebuilds.
End-Stop Calibration
Fine-tune the exact retracted position during machine commissioning to perfect material feeding without adding external physical stops.
Heavy Forming Press
Leverage the 8590 N push force at 0.7 MPa to drive heavy stamping or forming operations, using the adjustment screw to set the precise working depth.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125BX250-20 the Right Cylinder?
Choose this 125 mm bore when a 100 mm cylinder (providing 5497 N push at 0.7 MPa) lacks the necessary force, but before stepping up to a 160 mm bore (14074 N push at 0.7 MPa) which adds excess bulk. The adjustable 230-250 mm travel window is ideal for fine-tuning end stops at commissioning without machining new hard stops. For holding loads without live air pressure, note that the rear adjuster is strictly a travel stop, not a lock; you should specify an AirTAC SAIL or BSAI cylinder, or use an external pilot-operated check valve.
When replacing an ISO 15552 cylinder, match the 125 mm bore, 250 mm stroke, 20 mm adjustment range, PT G1/2 port, and the reduced SAIJ mounting set (Basic, FA, LB, TC, FTC, TCM1, TCM2). Because the 250 mm stroke is moderately long, ensure adequate external guiding to protect the 32 mm rod from excessive side-loading.
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 SAIJ125BX250-20 FAQ
At 0.7 MPa operating pressure, this 125 mm bore cylinder provides a push force of 8590 N and a pull force of 7654 N. At the maximum 1.0 MPa pressure, it achieves a maximum push force of 11045 N.
The rear adjuster screw acts as a mechanical stop that shortens the 250 mm nominal stroke by up to 20 mm, creating a 230-250 mm usable travel window. It only sets the end position and does not lock the load without live air pressure.
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