This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAIJ125X350-50, 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 SIJ125X350-50
The AirTAC SIJ125 Double Rod Adjustable Cylinder SIJ125X350-50 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 SAIJ125X350-50, 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 → SAIJ125X350-50
- 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 SIJ125X350-50
The AirTAC SIJ125X350-50 is a discontinued double-acting double-rod ISO 15552 adjustable-stroke cylinder. It uses an external stop screw to trim the extend stroke by up to 50 mm on-site, giving a usable 300-350 mm stroke. The direct replacement is the SAIJ125X350-50, matching the G1/2 port, M27x2 rod thread, and 40 mm cushion.
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. Upgrading to SAIJ brings an improved two Y-shaped one-way piston seal for lower start-up pressure. This SKU has no -S magnet and cannot take a switch.
Airtac SIJ125 Double Rod Adjustable Cylinder SIJ125X350-50 Technical Specifications
| Model | Airtac SIJ125 Double Rod Adjustable Cylinder SIJ125X350-50 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAIJ125X350-50 |
| 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 SAIJ125X350-50 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 SAIJ125X350-50 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 SIJ125X350-50
| 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 SIJ125X350-50 Is Used
Press Tonnage Calibration
Trimming the extend stroke by up to 50 mm on-site allows precise positioning of large 125 mm bore pressing tools without machining hard stops.
Variable Height Stacking
The 300-350 mm adjustable extend window lets a single cylinder handle mixed product stack heights before engaging the 40 mm cushions.
Replacing the Airtac SIJ125 Double Rod Adjustable Cylinder SIJ125X350-50 with the SAIJ125X350-50
Replace the discontinued SIJ125X350-50 directly with the SAIJ125X350-50. Choose the 50 mm adjust window if your extend stroke needs on-site tuning between 300 and 350 mm. Mounting interfaces (Basic, FA, LB, TC) reuse existing ISO 15552 fixtures. Because the 350 mm stroke is long, verify side-load limits and use external guides to prevent rod bending. This non-magnetic SKU lacks a -S sensor groove, so it cannot accept legacy CS1-B/DS1-B switches.
Replacement checklist
- ✓ Same ISO 15552 interface → SAIJ125X350-50
- ✓ 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 SIJ125X350-50 FAQ
Yes, the SIJ125X350-50 is discontinued. The direct replacement is the SAIJ125X350-50. It matches the ISO 15552 interface, 350 mm stroke, 50 mm adjust window, G1/2 port, and force, while adding an upgraded piston seal.
The double-acting double-rod SIJ125X350-50 pushes 6136 N and pulls 5734 N at 0.5 MPa. It pushes 8590 N at 0.7 MPa and 11045 N at 0.9 MPa (max 1251 kgf at 1.0 MPa). The external stop screw trims the extend stroke by up to 50 mm on-site, yielding a 300-350 mm usable stroke. The stop sets end position and is not a load lock.
Related AirTAC SAI Cylinders
Request a Quote for the SAIJ125X350-50
Send us the quantity and destination. We confirm price, stock and lead time on the SAIJ125X350-50 replacement — usually within 7-8 hours.