This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAIJ125X350-30S, 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 SIJ125X350-30S
The AirTAC SIJ125 Double Rod Adjustable Cylinder SIJ125X350-30S is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø125mm bore and 350mm stroke, G1/2 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAIJ125X350-30S, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ125 mm
- Stroke350 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2.0
- StatusDiscontinued → SAIJ125X350-30S
- 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 SIJ125X350-30S
The AirTAC SIJ125X350-30S is a discontinued double-acting double-rod ISO 15552 adjustable-stroke cylinder. An external stop screw lets you trim the extend stroke by up to 30 mm on-site, giving a usable 320-350 mm range from the 350 mm nominal maximum. The direct replacement is the SAIJ125X350-30S, retaining the exact interface, force, and adjust window.
The SAIJ upgrade utilizes an improved two Y-shaped one-way piston seal for lower start-up pressure and longer life. Note the stop screw sets end position only; it is not a load lock, so use an external rod lock or SAIL/BSAI variant for held loads.
Airtac SIJ125 Double Rod Adjustable Cylinder SIJ125X350-30S Technical Specifications
| Model | Airtac SIJ125 Double Rod Adjustable Cylinder SIJ125X350-30S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAIJ125X350-30S |
| Bore size | Ø125 mm |
| Stroke | 350 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 SAIJ125X350-30S 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 SAIJ125X350-30S 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 SIJ125X350-30S
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 125 | Bore size in mm. |
| ×350 | 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 SIJ125X350-30S Is Used
Press Fit Tuning
Final insertion depth of bearings requires field stroke tuning; trim the extend stroke by up to 30 mm on-site to dial in the exact press fit without re-mounting the actuator.
Variable Depth Carton Sealing
Sealing heads handling mixed carton heights benefit from the 320-350 mm usable stroke, allowing operators to set the precise end position for the sealing jaw via the external stop screw.
Adjustable Transfer Pusher
Diverting products of varying lengths onto secondary lines requires precise reach; the 30 mm adjust window lets you fine-tune the pusher endpoint quickly on the factory floor.
Replacing the Airtac SIJ125 Double Rod Adjustable Cylinder SIJ125X350-30S with the SAIJ125X350-30S
To replace the discontinued SIJ125X350-30S, order the direct replacement SAIJ125X350-30S, keeping the same 125 mm bore, 350 mm stroke, 30 mm adjust window, and G1/2 port. Choose the 30 mm adjust window if your end-position tuning falls within 320-350 mm; for larger trims, select a different adjust suffix. Mounting interfaces include Basic, FA, LB, and TC. The -S suffix means a piston magnet is present for legacy CS1-B/DS1-B switches (the SAIJ uses current AirTAC switches). Because the stroke is 350 mm, ensure external guides support side loads to prevent rod bending.
Replacement checklist
- ✓ Same ISO 15552 interface → SAIJ125X350-30S
- ✓ 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 SIJ125X350-30S FAQ
Yes, the AirTAC SIJ125X350-30S is discontinued. The direct replacement is the SAIJ125X350-30S. It shares the same ISO 15552 interface, 125 mm bore, 350 mm stroke, 30 mm adjust window, G1/2 port, and mounting options, but features an upgraded two Y-shaped one-way piston seal for longer life.
The external stop screw provides a 30 mm adjust window, allowing you to shorten the extend stroke from the 350 mm nominal maximum down to 320 mm on-site. The stop sets end position only and is not a load lock.
Related AirTAC SAI Cylinders
Request a Quote for the SAIJ125X350-30S
Send us the quantity and destination. We confirm price, stock and lead time on the SAIJ125X350-30S replacement — usually within 7-8 hours.