Airtac SAIJ125 Adjustable Cylinder SAIJ125BX35-30
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125BX35-30 is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 35mm 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
- Stroke35 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 SAIJ125BX35-30
The AirTAC SAIJ125X35-30 is a double-acting ISO 15552 profile cylinder equipped with a rear stroke adjuster, delivering 6136N of push force at 0.5 MPa. It features a SUS304 stainless steel rod and PT tapered ports. By turning the rear screw, you can trim the nominal 35mm stroke back by up to 30mm, creating a precise 5-35mm usable travel window for exact end-position tuning during commissioning.
This adjustable stopper lets you fine-tune the retract position on the fly without swapping the cylinder or adding external stops. The rear adjuster acts purely as a travel stop and works alongside the standard air cushions to decelerate the load, but it does not hold the load without live air. For load-holding requirements without continuous pressure, consider the SAIL or BSAI series instead.
Airtac SAIJ125 Adjustable Cylinder SAIJ125BX35-30 Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125BX35-30 |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 35 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 SAIJ125BX35-30
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×35 | 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 SAIJ125BX35-30 Is Used
Product Changeovers
Dial in the 5-35mm travel window during format changes to accommodate different product sizes without changing cylinder hardware.
End-Position Tuning
Fine-tune the exact retract stop during machine commissioning to perfect the mechanical timing and avoid hard mechanical crashes.
Short-Stroke Clamping
Leverage the 6136N of thrust at 0.5 MPa for heavy-duty clamping tasks where the exact clamping depth needs on-site adjustment.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125BX35-30 the Right Cylinder?
Choose this 125mm bore when you need substantial thrust—stepping down to an 80mm bore drops the 0.5MPa push force to 2513N. The adjustable stroke is ideal for machines requiring variable end-stops or frequent product-size changeovers, providing setup flexibility that a fixed-stroke SAI cylinder cannot match. When specifying your replacement, verify the 35mm nominal stroke, 30mm adjustment range, PT port threads, and your mounting choice from the SAIJ subset (Basic, FA, LB, TC, FTC, TCM1, TCM2).
Although the 35mm stroke is short, the 32mm diameter SUS304 rod provides excellent rigidity and side-load resistance. If your application involves heavy off-center loads, an external guide is still recommended to prevent premature seal wear.
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 SAIJ125BX35-30 FAQ
At 0.5 MPa operating pressure, this 125mm bore cylinder provides 6136N of push force and 5734N of pull force. It can reach a maximum push force of 11045N at 0.9 MPa.
The rear adjuster screw allows you to shorten the 35mm nominal stroke by up to 30mm, providing a usable travel window of 5 to 35mm. The adjuster acts as a physical stop to set the exact end position and does not function as a lock.
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