Airtac SAIJ40 Adjustable Cylinder SAIJ40BX125-100S
The AirTAC Airtac SAIJ40 Adjustable Cylinder SAIJ40BX125-100S is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø40mm bore and 125mm stroke, G1/4 air ports and adjustable end cushioning. Its standardized mounting interface makes it a drop-in replacement for other ISO 15552 cylinders in automation lines.
- BoreØ40 mm
- Stroke125 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- CushionAdjustable, 30 mm
About the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX125-100S
The AirTAC SAIJ40X125-100-S is a double-acting ISO 15552 profile cylinder featuring a rear stroke adjuster that allows you to trim the nominal 125 mm travel back by up to 100 mm. This yields a highly flexible usable travel window of 25 to 125 mm, letting you dial in the exact end position during commissioning without swapping hardware. It delivers 628 N of push force and 528 N of pull force at 0.5 MPa, utilizing a PT tapered port thread.
Built for demanding setups, this variant incorporates a SUS304 stainless steel rod (code B) for superior corrosion resistance and includes a magnet for position sensing. It is fully compatible with AirTAC CMSE reed and DMSE electronic solid-state switches fitted into the dual-side sensor grooves. The extruded aluminum barrel means it is a true profile cylinder, and the rear screw acts purely as a travel stop to decelerate the load, not as a lock.
Airtac SAIJ40 Adjustable Cylinder SAIJ40BX125-100S Technical Specifications
| Model | Airtac SAIJ40 Adjustable Cylinder SAIJ40BX125-100S |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø40 mm |
| Stroke | 125 mm |
| Acting type | Double acting |
| Port size | G1/4 |
| 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, 30 mm |
| Max stroke | Up to 1200 mm |
Specifications follow the official AirTAC SAI series datasheet and ISO 15552 dimensions. Confirm against the product label before installation. Port options: G (BSPP) / 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 | |
Actual usable force is lower than theoretical due to friction and back-pressure. Size with a safety margin.
Model Code: Airtac SAIJ40 Adjustable Cylinder SAIJ40BX125-100S
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 40 | Bore size in mm. |
| ×125 | Stroke length in mm. |
| -S | Optional built-in magnet for sensor position sensing. |
Related SAI-family variants: SAID (double rod), SAIJ (adjustable stroke), SAIL (with lock), SAIF (with valve), BSAI (enclasp / clamp-lock), and SAI-S with built-in magnet. Rod material: carbon steel (blank) / SUS420J2 (A) / SUS304 (B); seals: TPU (blank) / Viton H / NBR N.
Where the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX125-100S Is Used
Changeover Calibration
Perfect for packaging lines that switch between box sizes, using the 25-125 mm travel window to set new retract positions rapidly.
End-Stop Truing
Allows fine-tuning of the retract end-position during machine commissioning without machining new spacer blocks.
Corrosive Test Setup
The SUS304 stainless rod withstands moisture and chemical mists in lab environments while providing reliable 528 N pull force.
Is the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX125-100S the Right Cylinder?
Choose this 40 mm bore when your application requires the 628 N push force at 0.5 MPa, stepping up from a 32 mm bore that provides 402 N, or down from a 50 mm bore offering 982 N. The massive 100 mm adjustment range is ideal for machines handling frequent product size changeovers, allowing variable end-stops without adding external physical stops. If you need to hold a load without live air pressure, note that this adjuster is not a brake; you should look at the SAIL or BSAI series instead.
For an exact ISO 15552 dimensional replacement, match the 40 mm bore, 125 mm stroke, 100 mm adjustment, PT port threads, and the -S magnet option. Because the stroke is 125 mm, side-load is minimal, but always ensure the M12x1.25 rod thread is aligned to prevent binding. The SAIJ mounting set includes Basic, FA, LB, TC, FTC, TCM1, and TCM2, omitting the FB, CA, CB, and CR brackets.
Quick checklist
- ✓ Required force at your working pressure
- ✓ Stroke and mounting space
- ✓ Port/thread type (PT/NPT/G)
- ✓ Magnet (-S) for sensors?
- ✓ Side load — consider a guided cylinder
Installation & Maintenance Notes
- check Use clean air filtered to 40µm or finer.
- check Keep within 0.15 – 1.0 MPa operating pressure.
- check Avoid side load on the piston rod.
- check Adjust end cushion screws for smooth stops.
- check Use correct mounting accessory (FA/FB/CA/CB/LB/TC).
- check Installation by qualified personnel per AirTAC docs.
Airtac SAIJ40 Adjustable Cylinder SAIJ40BX125-100S FAQ
At 0.5 MPa operating pressure, this 40 mm bore cylinder provides 628 N of push force and 528 N of pull force. It can reach up to 1130 N push force at 0.9 MPa.
A rear adjusting screw acts as an external stopper, allowing you to shorten the effective stroke from 125 mm down to as little as 25 mm. It sets the travel end and relies on the air cushion for deceleration, but does not lock the load without live air pressure.
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