This model is discontinued
AirTAC has phased out the SU series. You can still order this code here: we ship the direct replacement SAUJ40X300-50S, with the same bore, stroke, output force, port and mounting, so it fits the same application. The SAU replacement uses the same profile body, bore, stroke, force and SC-series mounting. It moves to the current CMSG / DMSG / EMSG sensor switches (the SU used CS1-B / DS1-B) and adds the SAUF valve-integrated option.
Airtac SUJ Adjustable Cylinder SUJ40X300-50S
The AirTAC Airtac SUJ Adjustable Cylinder SUJ40X300-50S is a double-acting profile-type standard cylinder with a Ø40mm bore and 300mm stroke, 1/4" air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAUJ40X300-50S, which matches its bore, stroke, force and mounting.
- BoreØ40 mm
- Stroke300 mm
- Port size1/4"
- Acting typeDouble acting
- Rod threadM12×1.25
- StatusDiscontinued → SAUJ40X300-50S
- 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 SUJ Adjustable Cylinder SUJ40X300-50S
The AirTAC SUJ40X300-50S is a double-acting, double-rod profile cylinder with an external stop screw that lets you trim the extend stroke by up to 50 mm on-site, yielding a usable 250-300 mm stroke from the 300 mm nominal maximum. It features a 1/4" port, a 16 mm rod, and adjustable air cushions. This discontinued unit is fully replaced by the direct replacement SAUJ40X300-50S, which retains the exact bore, force, port, and FA/LB mounting.
The SAUJ upgrade transitions from legacy CS1-B/DS1-B switches to current CMSG/DMSG/EMSG sensors. The stop screw sets the end position but is not a load lock; use an external rod lock to hold loads on air loss. At 300 mm, external guides are advised to prevent rod bending.
Airtac SUJ Adjustable Cylinder SUJ40X300-50S Technical Specifications
| Model | Airtac SUJ Adjustable Cylinder SUJ40X300-50S |
|---|---|
| Series | SU profile-type cylinder (discontinued) |
| Replacement | SAUJ40X300-50S |
| Bore size | Ø40 mm |
| Stroke | 300 mm |
| Acting type | Double acting |
| Port size | 1/4" |
| Rod thread | M12×1.25 |
| 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 – 800 mm/s |
| Cushion | Adjustable, 21 mm |
| Max standard stroke | Up to 1200 mm |
Specifications follow the official AirTAC SU datasheet (now discontinued). The SAUJ40X300-50S carries the same ratings. Confirm against the product label before installation. Thread options: PT / G / NPT.
Theoretical Output Force (Ø40mm)
| Pressure | Push force | Pull force |
|---|---|---|
| 0.5 MPa | 628 N | 528 N |
| 0.7 MPa | 880 N | — |
| Max (@1.0 MPa) | 128 kgf | |
The SAUJ40X300-50S produces the same force from the same bore. Actual usable force is lower than theoretical; size with a margin.
Model Code: Airtac SUJ Adjustable Cylinder SUJ40X300-50S
| SU | Profile-type standard cylinder (discontinued). |
|---|---|
| 40 | Bore size in mm. |
| ×300 | Stroke length in mm. |
| -S | Optional built-in magnet for sensor position sensing. |
Legacy SU-family variants: SUD (double rod), SUJ (adjustable stroke) — each maps to its SAU equivalent (SUD→SAUD, SUJ→SAUJ). The current SAU line adds the SAUF valve-integrated option.
Where the Airtac SUJ Adjustable Cylinder SUJ40X300-50S Is Used
Variable Depth Drilling
Trimming the extend stroke by up to 50 mm on-site allows a drill head to accommodate varying material thicknesses without reprogramming the machine cycle.
Adjustable Diverter Stroke
A 250-300 mm extend window lets operators fine-tune a diverter arm position on the line to handle changing package widths dynamically.
Crush-Sensitive Forming
The external stop screw sets a precise end position for delicate folding arms, preventing over-travel and damage to fragile packaging materials.
Replacing the Airtac SUJ Adjustable Cylinder SUJ40X300-50S with the SAUJ40X300-50S
To replace the discontinued SUJ40X300-50S, order the direct replacement SAUJ40X300-50S, which matches the 40 mm bore, 300 mm max stroke, 50 mm adjust window, 1/4" port, and FA/LB mounting. Choose the 50 mm adjust window when you need on-site extend tuning from 250 to 300 mm; for fixed stops, a standard SAU cylinder suffices. Because this unit has an -S magnet, note that the SAUJ uses current CMSG/DMSG/EMSG sensors instead of the legacy CS1-B/DS1-B. As the 300 mm stroke invites side-load wear, ensure external guides support the rod to prevent bending.
Replacement checklist
- ✓ Same bore / stroke → SAUJ40X300-50S
- ✓ Port/thread type (PT/G/NPT)
- ✓ Magnet (-S): sensor family CS1-B → CMSG
- ✓ Mounting reused (FA/FB/CA/CB/LB)
- ✓ Need a built-in valve? → SAUF
Airtac SUJ Adjustable Cylinder SUJ40X300-50S FAQ
Yes, the SUJ40X300-50S is discontinued. The direct replacement is the SAUJ40X300-50S, which matches the 40 mm bore, 300 mm stroke, 50 mm adjust window, 1/4" port, and FA/LB mounting. The SAUJ also uses current CMSG/DMSG/EMSG sensors instead of the legacy CS1-B/DS1-B switches.
The external stop screw allows you to shorten the extend stroke by up to 50 mm on-site, giving a usable range of 250-300 mm. The stop sets end position only; it is not a load lock.
Related AirTAC SAU Cylinders
Request a Quote for the SAUJ40X300-50S
Send us the quantity and destination. We confirm price, stock and lead time on the SAUJ40X300-50S replacement — usually within 7-8 hours.