Airtac SAIF Series Standard Cylinder with Valve SAIF40X250-08B
The AirTAC Airtac SAIF Series Standard Cylinder with Valve SAIF40X250-08B is a genuine double-acting ISO 15552 cylinder with a Ø40mm bore, 250mm stroke and a built-in 4M210-08 5/2 solenoid valve — it switches itself from one coil signal, so no separate remote valve or extra plumbing is needed.
- BoreØ40 mm
- Stroke250 mm
- Built-in valve4M210-08
- Valve port1/4"
- CoilDC24V
- EntryTerminal
About the Airtac SAIF Series Standard Cylinder with Valve SAIF40X250-08B
The AirTAC SAIF40X250-08B is a double-acting ISO 15552 profile cylinder featuring a built-in 4M210-08 5/2 solenoid valve. This integrated assembly delivers a Cv of 0.89 and operates on DC24V via a terminal electrical entry. By combining the actuator and valve into one unit, it eliminates remote plumbing and saves panel space, making it highly effective for decentralized machine stations. The assembly operates safely within a 0.15-0.8 MPa pressure range, as the integrated valve limits the 1.0 MPa cylinder capacity. At 0.5 MPa, it provides 628N of push force and 528N of pull force.
This 40mm bore, 250mm stroke unit is driven by a single coil signal, consuming just 3.0W with an IP65 rating and a 0.05s activation time. The manifold connects to the cylinder using O8xO5 PU tubing, and it is crucial to note the valve port code 08 (1/4) differs from the cylinder port size. From the factory, the default setting retracts the piston rod when the coil is energised, but you can reposition the valve to extend-when-energised if your sequence requires it.
Airtac SAIF Series Standard Cylinder with Valve SAIF40X250-08B Technical Specifications
| Model | Airtac SAIF Series Standard Cylinder with Valve SAIF40X250-08B |
|---|---|
| Series | SAIF ISO 15552 cylinder with valve |
| Bore size | Ø40 mm |
| Stroke | 250 mm |
| Acting type | Double acting, self-valved |
| Cylinder port | G1/4 |
| Rod thread | M12×1.25 |
| PU tube | Ø8 × Ø5 |
| Built-in valve | 4M210-08 (5/2) |
|---|---|
| Valve flow | 16.0 mm² (Cv 0.89) |
| Max frequency | 5 cycle/sec |
| Coil voltage | DC24V · DC 3.0 W |
| Electrical entry | Terminal · IP65 · B class |
| Response time | 0.05 s and below |
| Operating pressure | 0.15 – 0.8 MPa (valve limit) |
| Speed range | 30 – 800 mm/s |
The cylinder rates to 1.0 MPa but the built-in valve operates 0.15–0.8 MPa, so run the assembled SAIF at 0.15–0.8 MPa. Default: rod retracts when the coil is energised (reconfigurable to extend). Specs follow the official AirTAC SAIF datasheet. Port options: PT / G.
Theoretical Output Force (Ø40mm)
| Pressure | Push force | Pull force |
|---|---|---|
| 0.5 MPa | 628 N | 528 N |
| 0.7 MPa | 880 N | — |
Sized within the valve's 0.15–0.8 MPa range. Actual usable force is lower than theoretical due to friction and back-pressure.
Model Code: Airtac SAIF Series Standard Cylinder with Valve SAIF40X250-08B
| SAIF | ISO 15552 cylinder with built-in 4M valve. |
|---|---|
| 40×250 | Bore × stroke in mm. |
| -08 | Valve port 1/4" → 4M210-08. |
| B | Coil voltage DC24V. |
| I / (blank) | Terminal electrical entry. |
SAIF does not hold its load without air — the valve routes air, it is not a lock. For load-holding use a SAIL (lock) or BSAI (clamp-lock).
Where the Airtac SAIF Series Standard Cylinder with Valve SAIF40X250-08B Is Used
Decentralized Stations
Ideal for large machines with multiple actuuator points, eliminating long air lines from a central valve island.
Compact Assembly
Fits into tight machine footprints where space for separate pneumatic plumbing and valve manifolds is restricted.
Retrofit Upgrades
Perfect for upgrading older lines where routing new valve control wiring is costly or physically impossible.
Is the Airtac SAIF Series Standard Cylinder with Valve SAIF40X250-08B the Right Choice?
Select this 40mm bore model when an application demands more force than the 32mm variant (which offers 402N push at 0.5 MPa) but does not require the 982N push of the 50mm bore. The self-valved SAIF architecture is superior to a separate cylinder and remote valve setup when you need to minimize wiring and tubing across a large machine layout. The DC24V terminal coil offers safe, low-voltage control with 3.0W power consumption.
Because the stroke is 250mm, ensure adequate guide support to prevent side-load damage to the rod and seals. The cylinder uses a PT1/4 tapered port thread and carbon steel rod material. For exact replacement, verify the 40mm bore, 250mm stroke, 1/4 valve port, DC24V voltage, terminal entry, and absence of a magnet (-S). Note that the 5/2 valve routes air but does not lock the load; if position holding without live pressure is needed, consider the SAIL lock series instead.
Quick checklist
- ✓ Force at 0.15–0.8 MPa
- ✓ Coil voltage matches panel
- ✓ Terminal vs grommet entry
- ✓ Retract- or extend-when-energised
- ✓ Load-holding → SAIL / BSAI
Airtac SAIF Series Standard Cylinder with Valve SAIF40X250-08B FAQ
The 40mm bore cylinder provides 628N push and 528N pull force at 0.5 MPa. The built-in 4M210-08 valve has an effective area of 16.0 mm2 with a Cv of 0.89.
No, the integrated 4M210 5/2 valve switches the cylinder directly from one DC24V coil signal. By default, the rod retracts when the coil is energised, but it can be reconfigured to extend-when-energised by repositioning the valve.
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