This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAIJ125X275-75, 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 SIJ125X275-75
The AirTAC SIJ125 Double Rod Adjustable Cylinder SIJ125X275-75 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 SAIJ125X275-75, 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 → SAIJ125X275-75
- 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 SIJ125X275-75
The AirTAC SIJ125X275-75 is a discontinued double-acting double-rod ISO 15552 adjustable-stroke cylinder. It features a 125mm bore, 275mm maximum nominal stroke, and an external stop screw that lets you trim the extend stroke by up to 75mm on-site (yielding a 200-275mm usable extend). The direct replacement is the SAIJ125X275-75, matching the interface, force, and mounting.
The SAIJ successor retains the 32mm rod and M27x2 thread but incorporates an upgraded two Y-shaped one-way piston seal for lower start-up pressure and longer life. Note this non-magnetic SKU cannot take a switch, and the external stop sets end position only—it is not a load lock; use SAIL or BSAI for held loads.
Airtac SIJ125 Double Rod Adjustable Cylinder SIJ125X275-75 Technical Specifications
| Model | Airtac SIJ125 Double Rod Adjustable Cylinder SIJ125X275-75 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAIJ125X275-75 |
| 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 SAIJ125X275-75 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 SAIJ125X275-75 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 SIJ125X275-75
| 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 SIJ125X275-75 Is Used
Press Fit Tuning
Allows on-site extend stroke adjustment up to 75mm to dial in exact press-fit depths for varying bearing housings without machining new stops.
Variable Length Diverter
Adjusts the extend position on a sorting lane to accommodate different package lengths on the fly, trimming the 275mm stroke as needed.
Adjustable Pallet Stop
Sets precise end-of-stroke stopping points for different pallet footprints in a handling line, using the external screw to shorten the extend.
Replacing the Airtac SIJ125 Double Rod Adjustable Cylinder SIJ125X275-75 with the SAIJ125X275-75
To replace the discontinued SIJ125X275-75, order the direct replacement SAIJ125X275-75 (same ISO 15552 footprint, 75mm adjust window, G1/2 port). Select the 75mm adjust window if your extend stroke needs on-site tuning between 200-275mm; a fixed SAI cylinder is simpler if no trim is needed. Mounting attachments (FA, LB, TC) reuse standard ISO 15552 interfaces. Because this SKU lacks the -S suffix, it has no magnet and cannot accept legacy CS1-B/DS1-B sensors. For strokes >=300mm, verify side-load limits to prevent rod binding.
Replacement checklist
- ✓ Same ISO 15552 interface → SAIJ125X275-75
- ✓ 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 SIJ125X275-75 FAQ
Yes, the SIJ125X275-75 is discontinued. The direct replacement is the SAIJ125X275-75. It shares the identical ISO 15552 interface, 125mm bore, 275mm stroke, 75mm adjust window, G1/2 port, and mounting options, but uses an upgraded SAI piston seal.
The external stop screw allows trimming the extend stroke by up to 75mm on-site (usable extend 200-275mm). The stop sets end position only and is not a load lock.
Related AirTAC SAI Cylinders
Request a Quote for the SAIJ125X275-75
Send us the quantity and destination. We confirm price, stock and lead time on the SAIJ125X275-75 replacement — usually within 7-8 hours.