Airtac SAIJ125 Adjustable Cylinder SAIJ125X650-30S
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125X650-30S is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 650mm 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
- Stroke650 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125X650-30S
The AirTAC SAIJ125X650-30-S is a double-acting, single-rod ISO 15552 profile cylinder equipped with a rear stroke adjuster. It features a standard carbon steel rod and a built-in magnet for position sensing. With a 125mm bore operating at 0.5 MPa, it provides 6136N of push force and 5734N of pull force, making it suited for heavy-duty manipulation.
This SKU provides a 620-650mm usable travel window, allowing you to dial back the nominal 650mm stroke by up to 30mm. The adjuster acts purely as a travel stop for end-position tuning and does not hold the load without live air. For load-holding without pressure, consider the SAIL or BSAI series. It includes dual-side sensor grooves compatible with CMSE reed and DMSE electronic switches.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X650-30S Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X650-30S |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 650 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 SAIJ125X650-30S
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×650 | 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 SAIJ125X650-30S Is Used
Variable End-Stop Machining
Fine-tune the 620-650mm retraction point on the fly to accommodate different part lengths without disassembling the fixture.
Product Changeover
Quickly adjust the stroke end-position by up to 30mm during line changeovers, saving time over replacing fixed-stroke SAI cylinders.
Heavy-Duty Positioning
Leverage the 6136N push force at 0.5 MPa to move heavy pallets, using the rear stop to precisely set the indexing distance.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X650-30S the Right Cylinder?
Choose this adjustable-stroke model when you need fine end-position tuning during commissioning or product changeover without swapping the cylinder or adding external stops. If your application requires less force, stepping down to a 100mm bore yields 3927N at 0.5 MPa, while a 160mm bore offers 10053N for heavier loads. Because the 650mm stroke is long, an external guide is recommended to handle side loads and prevent rod damage.
To match this ISO 15552 cylinder, specify a 125mm bore, 650mm stroke, 30mm adjustment, PT tapered port thread, carbon steel rod, and a -S magnet. The SAIJ mounting set includes Basic, FA, LB, TC, FTC, TCM1, and TCM2, omitting FB, CA, CB, and CR. The standard speed range for this bore is 30-500 mm/s.
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 SAIJ125X650-30S FAQ
At 0.5 MPa, this 125mm bore cylinder provides 6136N of push force and 5734N of pull force. At 0.7 MPa, the push force increases to 8590N.
The rear adjuster screw lets you shorten the effective travel from 650mm down to 620mm, creating a 620-650mm window. It functions as a mechanical stop for tuning and does not lock the load without live air pressure.
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