Airtac SAIJ125 Adjustable Cylinder SAIJ125AX450-30S
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125AX450-30S is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 450mm 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
- Stroke450 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX450-30S
The AirTAC SAIJ125X450-30-S is a double-acting ISO 15552 profile cylinder featuring a rear stroke adjuster that allows you to fine-tune the effective travel down to a 420-450 mm window without adding external stops. It delivers 6136 N of push force and 5734 N of pull force at 0.5 MPa, making it suited for heavy-duty positioning tasks. This specific SKU features a SUS420J2 stainless steel rod (code A) for enhanced corrosion resistance and includes a built-in magnet (-S) compatible with AirTAC CMSE reed and DMSE electronic sensors.
The rear adjustment screw acts purely as a mechanical travel stop to dial in the exact end position during commissioning or product changeovers; it does not lock or hold the load without live air. For load-holding without pneumatic pressure, a separate SAIL or BSAI lock variant is required. This model uses a PT G1/2 tapered port and relies on the extruded aluminum barrel design, completely avoiding tie-rod construction.
Airtac SAIJ125 Adjustable Cylinder SAIJ125AX450-30S Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125AX450-30S |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 450 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 SAIJ125AX450-30S
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×450 | 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 SAIJ125AX450-30S Is Used
Product Changeover
Dial in the exact 420-450 mm end-stop during line changeovers to accommodate different product lengths without physically swapping the cylinder.
Heavy Pressing
Leverage the 6136 N push force at 0.5 MPa to securely seat or press heavy components, using the rear adjuster to fine-tune the final contact position.
Machine Setup
Trim the travel window by up to 30 mm during initial commissioning to perfectly align tooling coordinates without adding external mechanical stops.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX450-30S the Right Cylinder?
Choose this SAIJ125X450-30-S variant when an application requires precise end-position tuning across a 420-450 mm travel window and heavy thrust. If your process demands less force, stepping down to a 100 mm bore yields 3927 N of push force at 0.5 MPa, whereas moving up to a 160 mm bore provides 10053 N. The adjustable rear stopper is ideal for machine setups that undergo frequent product-size changeovers, replacing the need to physically swap out a fixed-stroke SAI cylinder.
Because the 450 mm stroke is substantial, the 32 mm rod diameter and M27x2 rod thread must be properly supported; an external guide is highly recommended to prevent excessive side-loading on the piston. When matching this cylinder for an ISO 15552 replacement, verify the 125 mm bore, 450 mm stroke, 30 mm adjustment range, PT G1/2 port, 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, and CR brackets. Furthermore, the maximum operating speed for this 125 mm 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 SAIJ125AX450-30S FAQ
At an operating pressure of 0.5 MPa, this 125 mm bore cylinder provides 6136 N of push force and 5734 N of pull force. It can deliver up to 11045 N of push force at 0.9 MPa.
The rear adjustment screw acts as a mechanical stop that allows you to shorten the nominal 450 mm stroke by up to 30 mm, providing a usable travel window of 420-450 mm. This stopper only sets the end position and does not lock the load without live air pressure.
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