This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAIJ125X145-50S, 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 SIJ125X145-50S
The AirTAC SIJ125 Double Rod Adjustable Cylinder SIJ125X145-50S is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø125mm bore and 145mm stroke, G1/2 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAIJ125X145-50S, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ125 mm
- Stroke145 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2.0
- StatusDiscontinued → SAIJ125X145-50S
- 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 SIJ125X145-50S
The AirTAC SIJ125X145-50S is a discontinued double-acting double-rod ISO 15552 adjustable-stroke cylinder with a 125 mm bore and G1/2 port. An external stop screw lets you trim the extend stroke by up to 50 mm on-site, yielding a usable 95-145 mm extension from the 145 mm nominal maximum. The direct replacement is the SAIJ125X145-50S, retaining the same interface, force, and mounting.
The stop screw sets the end position but is not a load lock; use an external rod lock or SAIL/BSAI variant for held loads. The SAIJ successor upgrades the piston seal to two Y-shaped one-way elements for lower start-up pressure, and the -S suffix provides a piston magnet for legacy CS1-B/DS1-B switches.
Airtac SIJ125 Double Rod Adjustable Cylinder SIJ125X145-50S Technical Specifications
| Model | Airtac SIJ125 Double Rod Adjustable Cylinder SIJ125X145-50S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAIJ125X145-50S |
| Bore size | Ø125 mm |
| Stroke | 145 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 SAIJ125X145-50S 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 SAIJ125X145-50S 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 SIJ125X145-50S
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 125 | Bore size in mm. |
| ×145 | 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 SIJ125X145-50S Is Used
Press Fit Tuning
Allows operators to dial in the exact 95-145 mm extend position for seating bearings without swapping cylinders.
Variable Length Diverter
Adjusts the extend stop on-site to deflect changing package sizes on a sorting line.
Adjustable Pallet Stop
Sets a precise mechanical end position for different pallet depths while using the G1/2 port.
Replacing the Airtac SIJ125 Double Rod Adjustable Cylinder SIJ125X145-50S with the SAIJ125X145-50S
To replace the discontinued SIJ125X145-50S, order the direct replacement SAIJ125X50S directly. Choose the 50 mm adjust window if you need to trim the 145 mm nominal stroke down to 95 mm on-site. Mounting options include FA, LB, and TC brackets. The -S suffix includes a piston magnet for legacy CS1-B/DS1-B switches. For strokes of 300 mm or longer, verify shaft deflection and side-load limits.
Replacement checklist
- ✓ Same ISO 15552 interface → SAIJ125X145-50S
- ✓ 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 SIJ125X145-50S FAQ
Yes, the SIJ125X145-50S is discontinued. The direct replacement is the SAIJ125X145-50S, matching the 125 mm bore, 145 mm stroke, 50 mm adjust window, G1/2 port, and ISO 15552 mounting.
The 50 mm external stop screw window trims the 145 mm nominal extend stroke down to 95 mm. The stop sets end position and is not a load lock.
Related AirTAC SAI Cylinders
Request a Quote for the SAIJ125X145-50S
Send us the quantity and destination. We confirm price, stock and lead time on the SAIJ125X145-50S replacement — usually within 7-8 hours.