Airtac SAIJ125 Adjustable Cylinder SAIJ125X105-30S
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125X105-30S is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 105mm 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
- Stroke105 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125X105-30S
The AirTAC SAIJ125X105-30-S is a double-acting, single-rod ISO 15552 profile cylinder equipped with a rear stroke adjuster. It features a 125 mm bore generating 6136 N of push force at 0.5 MPa, paired with a 105 mm nominal stroke that can be fine-tuned down by up to 30 mm. This yields a precise 75-105 mm usable travel window, allowing you to dial in the exact end position during commissioning without swapping hardware.
This variant includes a standard magnet for position sensing alongside a carbon steel rod and PT tapered port threads. The extruded aluminum barrel incorporates sensor grooves on both sides, directly supporting AirTAC CMSE reed and DMSE electronic solid-state switches. It uses variable air cushions at both ends to decelerate the load, but the adjuster and cushions act only as travel stops—they will not hold the load without live air pressure.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X105-30S Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X105-30S |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 105 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 SAIJ125X105-30S
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×105 | 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 SAIJ125X105-30S Is Used
Product Changeover
Dial in the 75-105 mm travel window on the fly to accommodate different carton or part sizes on the same fixture without changing the cylinder.
Machine Setup
Fine-tune the retract end position during commissioning to achieve exact clamping depth, avoiding the need for external mechanical stops.
Heavy Forming
Leverage the 6136 N push force at 0.5 MPa for pressing or forming tasks while retaining the flexibility to adjust the stroke limit.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X105-30S the Right Cylinder?
Choose this 125 mm bore when your application requires substantial thrust, stepping up from a 100 mm cylinder that provides 3927 N push force at 0.5 MPa. The adjustable 75-105 mm window is perfect for packaging lines or fixtures needing rapid product-size changeovers, giving you a variable end-stop instead of machining custom spacers or ordering a fixed-stroke SAI cylinder. For load-holding without continuous air pressure, you must integrate an external pilot-operated check valve or switch to a SAIL or BSAI locking cylinder, as the SAIJ adjuster is strictly a stop.
When replacing an ISO 15552 cylinder, verify the 125 mm bore, 105 mm stroke, 30 mm adjustment range, PT port threads, and the -S magnet option. Mounting choices are limited to Basic, FA, LB, TC, FTC, TCM1, and TCM2, deliberately omitting FB, CA, CB, and CR brackets. Because the 105 mm stroke is relatively short, side-load risks are minimal, but the 32 mm rod diameter and M27x2 rod thread still handle robust mechanical loads effectively.
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 SAIJ125X105-30S FAQ
At 0.5 MPa operating pressure, this 125 mm bore cylinder provides 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 lets you shorten the 105 mm nominal stroke by up to 30 mm, creating a 75-105 mm usable travel window. This allows you to set the exact retract end position during setup, though it acts as a stop and does not lock the load without air pressure.
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