This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAIJ125X275-30S, with the same bore, stroke, output force, port and mounting, so it fits the same application. The SAI replacement keeps the same ISO 15552 mounting interface, bore, stroke, output force and accessories, so it drops straight into existing fixtures. It is the current-production version of this cylinder with an upgraded piston seal.
Airtac SIJ125 Double Rod Adjustable Cylinder SIJ125X275-30S
The AirTAC SIJ125 Double Rod Adjustable Cylinder SIJ125X275-30S is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø125mm bore and 275mm stroke, G1/2 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAIJ125X275-30S, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ125 mm
- Stroke275 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2.0
- StatusDiscontinued → SAIJ125X275-30S
- 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 SIJ125 Double Rod Adjustable Cylinder SIJ125X275-30S
The AirTAC SIJ125X275-30S is a discontinued double-acting double-rod ISO 15552 adjustable-stroke cylinder. Its external stop screw lets you trim the extend stroke by up to 30mm on-site, giving a usable 245-275mm range. The direct replacement is the SAIJ125X275-30S, matching the 125mm bore, 275mm stroke, G1/2 port, and mounting interface.
The SAIJ upgrade uses a two Y-shaped one-way piston seal for low start-up pressure. The -S suffix provides a piston magnet for CS1-B/DS1-B sensors.
Airtac SIJ125 Double Rod Adjustable Cylinder SIJ125X275-30S Technical Specifications
| Model | Airtac SIJ125 Double Rod Adjustable Cylinder SIJ125X275-30S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAIJ125X275-30S |
| Bore size | Ø125 mm |
| Stroke | 275 mm |
| Acting type | Double acting |
| Port size | G1/2 |
| Rod thread | M27×2.0 |
| 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 standard stroke | Up to 1500 mm |
Specifications follow the official AirTAC SI datasheet (now discontinued). The SAIJ125X275-30S carries the same ISO 15552 ratings. Confirm against the product label before installation. Thread options: PT / G / 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 | |
The SAIJ125X275-30S produces the same force from the same bore. Actual usable force is lower than theoretical; size with a margin.
Model Code: Airtac SIJ125 Double Rod Adjustable Cylinder SIJ125X275-30S
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 125 | Bore size in mm. |
| ×275 | Stroke length in mm. |
| -S | Optional built-in magnet for sensor position sensing. |
Legacy SI-family variants: SID (double rod), SIJ (adjustable stroke) — each maps to its SAI equivalent (SID→SAID, SIJ→SAIJ). Rod material: carbon steel (blank) / SUS420J2 (A) / SUS304 (B).
Where the Airtac SIJ125 Double Rod Adjustable Cylinder SIJ125X275-30S Is Used
Press Fit Tuning
Dial in the exact 245-275mm extend position for seating bearings without machining custom spacers.
Variable Carton Flaps
Adapt the stroke on-site to accommodate changing box heights on a packaging line.
End-Stop Calibration
Fine-tune the extend endpoint in assembly fixtures to compensate for mechanical wear over time.
Replacing the Airtac SIJ125 Double Rod Adjustable Cylinder SIJ125X275-30S with the SAIJ125X275-30S
Replace the discontinued SIJ125X275-30S directly with the SAIJ125X275-30S. Choose the 30mm adjust window if your end-position tuning falls within 245-275mm. Mounting reuses ISO 15552 FA, LB, or TC interfaces. The -S suffix ensures a piston magnet for legacy CS1-B/DS1-B switches. For stroke lengths >=300mm, verify side-load tolerance. The stop screw sets end position but is NOT a load lock; for held loads use an external rod lock or SAIL/BSAI variant.
Replacement checklist
- ✓ Same ISO 15552 interface → SAIJ125X275-30S
- ✓ Same bore / stroke / force
- ✓ Port/thread type (PT/G/NPT)
- ✓ Magnet (-S) for sensors?
- ✓ Mounting reused (FA/FB/CA/CB/CR/LB/TC)
Airtac SIJ125 Double Rod Adjustable Cylinder SIJ125X275-30S FAQ
Yes, the SIJ125X275-30S is discontinued. The direct replacement is the SAIJ125X275-30S, sharing the same ISO 15552 interface, 125mm bore, 275mm stroke, 30mm adjust window, and G1/2 port.
The external stop screw window is 30mm, allowing the extend stroke to be trimmed from 275mm down to 245mm on-site.
Related AirTAC SAI Cylinders
Request a Quote for the SAIJ125X275-30S
Send us the quantity and destination. We confirm price, stock and lead time on the SAIJ125X275-30S replacement — usually within 7-8 hours.