Airtac SAIJ125 Adjustable Cylinder SAIJ125AX145-20
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125AX145-20 is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 145mm 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
- Stroke145 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX145-20
The AirTAC SAIJ125X145-20 is a double-acting ISO 15552 profile cylinder equipped with a rear stroke adjuster, allowing you to dial back the nominal 145 mm travel by up to 20 mm. This creates a precise 125-145 mm usable window for fine-tuning the retract end position during commissioning without adding external stops. It delivers a robust 6136 N push force at 0.5 MPa, making it well-suited for heavy-duty positioning tasks.
This specific configuration features a SUS420J2 stainless steel rod (material code A) for improved corrosion resistance compared to standard carbon steel. The 32 mm rod diameter and M27x2 thread provide a sturdy interface that handles high side loads well, though long unsupported strokes still require an external guide. It uses a tapered PT port and operates at speeds between 30-500 mm/s.
Airtac SAIJ125 Adjustable Cylinder SAIJ125AX145-20 Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125AX145-20 |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 145 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 SAIJ125AX145-20
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×145 | 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 SAIJ125AX145-20 Is Used
Machine Setup Tuning
Dial in the exact 125-145 mm retract position during initial commissioning to align heavy tooling without machining external stop blocks.
Product Changeover
Quickly adjust the end-stop by up to 20 mm on a packaging line when switching between product sizes, minimizing downtime.
Heavy-Duty Positioning
Leverage the 6136 N push force at 0.5 MPa to move and position heavy pallets or fixtures securely into the working zone.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX145-20 the Right Cylinder?
Selecting this 125 mm bore over the smaller 100 mm version steps up the 0.5 MPa push thrust from 3927 N to 6136 N, providing the necessary force for heavier fixtures. The adjustable stroke is chosen over a fixed SAI cylinder when you need variable end-stops for product changeovers or exact machine setup. The rear adjuster acts purely as a travel stop and does not hold the load without live air; for true load-holding without pressure, consider the SAIL or BSAI series.
When replacing an ISO 15552 cylinder, match the 125 mm bore, 145 mm stroke, 20 mm adjustment range, PT tapered port, and SUS420J2 rod material. The SAIJ mounting set includes Basic, FA, LB, TC, FTC, TCM1, and TCM2, omitting FB, CA, CB, and CR. Because this unit lacks the -S magnet option, it cannot host CMSE or DMSE sensors for position feedback.
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 SAIJ125AX145-20 FAQ
It features a rear external screw that lets you shorten the effective stroke by up to 20 mm, providing a usable travel window of 125-145 mm. The adjuster functions as a mechanical stop to set the end position and does not lock or hold the load without continuous air pressure.
At 0.5 MPa operating pressure, this 125 mm bore cylinder provides 6136 N of push force and 5734 N of pull force. At 0.7 MPa, the push force increases to 8590 N.
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