Airtac SAIJ125 Adjustable Cylinder SAIJ125BX250-30
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125BX250-30 is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 250mm 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
- Stroke250 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 SAIJ125BX250-30
The AirTAC SAIJ125X250-30 is a double-acting ISO 15552 profile cylinder featuring a rear-mounted stroke adjuster. It provides a usable travel window of 220 to 250 mm, allowing you to dial back the nominal 250 mm stroke by up to 30 mm during commissioning. In the 125 mm bore class, it delivers a robust 6136 N pull force at 0.5 MPa and up to 11045 N at 0.9 MPa.
This variant is built with a SUS304 stainless steel piston rod for superior corrosion resistance and ships with PT tapered port threads. The extruded aluminum barrel includes sensor grooves on both sides for flexible switch mounting. It operates at speeds of 30-500 mm/s and uses an external stopper rather than a locking mechanism, meaning it cannot hold a load without continuous live air pressure.
Airtac SAIJ125 Adjustable Cylinder SAIJ125BX250-30 Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125BX250-30 |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 250 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 SAIJ125BX250-30
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×250 | 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 SAIJ125BX250-30 Is Used
Variable End-Stop Positioning
Dial in the exact retract distance within the 220-250 mm window to accommodate varying material thicknesses without reprogramming machine logic.
Machine Changeover Setup
Fine-tune the end position during product size changes by turning the rear adjuster, eliminating the need to physically swap out the entire cylinder.
Heavy-Duty Assembly Pressing
Leverage the 6136 N pull force at 0.5 MPa to securely seat components, using the adjustable stop to prevent over-travel on delicate parts.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125BX250-30 the Right Cylinder?
Choose this 125 mm bore adjustable model when you need precise end-position tuning without swapping cylinders or adding external stops on your machine. If your application requires less force, stepping down to a 100 mm bore yields 3681 N of pull at 0.5 MPa; if you need more power, a 160 mm bore provides 9425 N at 0.5 MPa.
The rear adjuster acts solely as a travel stop for the retract end and works alongside the standard air cushions to decelerate the load, but it is not a lock. For true load-holding without live air, consider the SAIL or BSAI series instead. This SAIJ configuration includes a 250 mm stroke, a 30 mm adjustment range, PT ports, and SUS304 rod material. Because it lacks a magnet (-S), it will not trigger reed or electronic sensors directly.
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 SAIJ125BX250-30 FAQ
At a 0.5 MPa operating pressure, this 125 mm bore cylinder provides 6136 N of pull force and 8590 N at 0.9 MPa. The maximum rated force is 1251 kgf (roughly 12268 N) at 1.0 MPa.
The rear adjuster acts as an external stopper that lets you shorten the effective stroke from the nominal 250 mm down to 220 mm. It sets the travel end and decelerates the load, but it does not lock or hold the load without continuous air pressure.
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