AirTAC SEJ125 Adjustable-Stroke Cylinder, 125 mm Bore
Every AirTAC SEJ125 configuration on one page: 79 stock order codes with strokes from 25 to 800 mm, 3 adjustment values (10-100 mm), 3 mounting styles and magnet, seal and thread versions, from $267.76. Pick a stroke, adjustment, mounting and version to see the exact order code and price.
This combination is not a stock order code. Request a quote and we will confirm availability and price.
- 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 SEJ125
The AirTAC SEJ125 is a double-acting stroke-adjustable ISO 15552 tie-rod-free standard cylinder with a 125 mm bore and a 32 mm piston rod. At 0.5 MPa it pushes 6136 N and pulls 5734 N; at 0.7 MPa that rises to 8590 N push and 8027 N pull. A rear stroke-adjustment screw lets you shorten the travel by up to the adjustment amount in the code (10-100 mm across the codes on this page). Force depends on bore and pressure only, so every stroke on this page gives the same output.
All SEJ125 versions share 1/2" air ports, an M27×2 rod thread and 40 mm adjustable air cushions. The cylinder runs on filtered air between 0.15 and 1.0 MPa (proof 1.5 MPa), from -20 to +70 °C, at 30 to 500 mm/s. This page lists 79 stock order codes with strokes from 25 to 800 mm; catalog standard strokes run up to 1500 mm.
SEJ125 Technical Specifications
| Bore size | Ø125 mm |
|---|---|
| Stock strokes | 25 – 800 mm |
| Catalog standard stroke | up to 1500 mm (longer on request) |
| Acting type | Double acting |
| Port size | 1/2" (PT standard) |
| Piston rod / rod thread | Ø32 mm / M27×2 |
| Fluid | Air (filtered by 40 µm 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 |
Source: AirTAC Products Catalog 2026A, SE series (SEJ adjustable-stroke version) (ISO 15552). With FKM (H) seals the temperature range is 0 to +150 °C.
Theoretical output force (Ø125 mm)
| Pressure | Push | Pull |
|---|---|---|
| 0.5 MPa | 6136 N | 5734 N |
| 0.7 MPa | 8590 N | 8027 N |
Push = pressure × bore area; pull subtracts the Ø32 mm rod area. Usable force is lower because of friction and back-pressure.
How the SEJ125 Order Code Is Built
| SEJ125 | Series and bore (125 mm) |
|---|---|
| X100 | Stroke in mm |
| -10 | Stroke adjustment in mm (10, 20, 30, 40, 50, 75, 100) |
| S | Built-in magnet for position sensors (blank = none) |
| FA / FTC | Mounting: FA front flange, FTC front trunnion |
| H / N | Seal: H = FKM, N = NBR (blank = standard seal) |
| G | Port thread: G = G (BSPP), blank = PT |
All AirTAC SEJ125 Order Codes (79)
Each order code links to its own datasheet page. Use Select to load it into the configurator above.
| Order code | Stroke (mm) | Adjust (mm) | Mounting · Magnet · Seal · Thread | Price | Select |
|---|---|---|---|---|---|
| SEJ125X25-10 | 25 mm | 10 mm | Basic (no mounting) · - · std seal · PT | $267.76 | |
| SEJ125X25-10S | 25 mm | 10 mm | Basic (no mounting) · S · std seal · PT | $273.80 | |
| SEJ125X25-20S | 25 mm | 20 mm | Basic (no mounting) · S · std seal · PT | $273.80 | |
| SEJ125X30-20S | 30 mm | 20 mm | Basic (no mounting) · S · std seal · PT | $281.92 | |
| SEJ125X30-30S | 30 mm | 30 mm | Basic (no mounting) · S · std seal · PT | $281.92 | |
| SEJ125X40-10S | 40 mm | 10 mm | Basic (no mounting) · S · std seal · PT | $281.92 | |
| SEJ125X50-10S | 50 mm | 10 mm | Basic (no mounting) · S · std seal · PT | $281.92 | |
| SEJ125X50-20S | 50 mm | 20 mm | Basic (no mounting) · S · std seal · PT | $281.92 | |
| SEJ125X50-20SN | 50 mm | 20 mm | Basic (no mounting) · S · NBR · PT | $281.92 | |
| SEJ125X50-30 | 50 mm | 30 mm | Basic (no mounting) · - · std seal · PT | $275.87 | |
| SEJ125X50-30S | 50 mm | 30 mm | Basic (no mounting) · S · std seal · PT | $281.92 | |
| SEJ125X50-30SN | 50 mm | 30 mm | Basic (no mounting) · S · NBR · PT | $281.92 | |
| SEJ125X50-40S | 50 mm | 40 mm | Basic (no mounting) · S · std seal · PT | $281.92 | |
| SEJ125X50-50S | 50 mm | 50 mm | Basic (no mounting) · S · std seal · PT | $281.92 | |
| SEJ125X60-20S | 60 mm | 20 mm | Basic (no mounting) · S · std seal · PT | $290.29 | |
| SEJ125X60-30S | 60 mm | 30 mm | Basic (no mounting) · S · std seal · PT | $290.29 | |
| SEJ125X75-10S | 75 mm | 10 mm | Basic (no mounting) · S · std seal · PT | $290.29 | |
| SEJ125X75-20S | 75 mm | 20 mm | Basic (no mounting) · S · std seal · PT | $290.29 | |
| SEJ125X75-30S | 75 mm | 30 mm | Basic (no mounting) · S · std seal · PT | $290.29 | |
| SEJ125X75-50 | 75 mm | 50 mm | Basic (no mounting) · - · std seal · PT | $284.24 | |
| SEJ125X75-50S | 75 mm | 50 mm | Basic (no mounting) · S · std seal · PT | $290.29 | |
| SEJ125X75-75S | 75 mm | 75 mm | Basic (no mounting) · S · std seal · PT | $290.29 | |
| SEJ125X80-10SFTC | 80 mm | 10 mm | FTC front trunnion · S · std seal · PT | $363.60 | |
| SEJ125X80-20 | 80 mm | 20 mm | Basic (no mounting) · - · std seal · PT | $292.42 | |
| SEJ125X80-20S | 80 mm | 20 mm | Basic (no mounting) · S · std seal · PT | $298.46 | |
| SEJ125X80-30 | 80 mm | 30 mm | Basic (no mounting) · - · std seal · PT | $292.42 | |
| SEJ125X80-30S | 80 mm | 30 mm | Basic (no mounting) · S · std seal · PT | $298.46 | |
| SEJ125X80-40S | 80 mm | 40 mm | Basic (no mounting) · S · std seal · PT | $298.46 | |
| SEJ125X80-50 | 80 mm | 50 mm | Basic (no mounting) · - · std seal · PT | $292.42 | |
| SEJ125X80-75 | 80 mm | 75 mm | Basic (no mounting) · - · std seal · PT | $292.42 | |
| SEJ125X90-10S | 90 mm | 10 mm | Basic (no mounting) · S · std seal · PT | $298.46 | |
| SEJ125X90-40S | 90 mm | 40 mm | Basic (no mounting) · S · std seal · PT | $298.46 | |
| SEJ125X100-10S | 100 mm | 10 mm | Basic (no mounting) · S · std seal · PT | $298.46 | |
| SEJ125X100-20 | 100 mm | 20 mm | Basic (no mounting) · - · std seal · PT | $292.42 | |
| SEJ125X100-20S | 100 mm | 20 mm | Basic (no mounting) · S · std seal · PT | $298.46 | |
| SEJ125X100-30 | 100 mm | 30 mm | Basic (no mounting) · - · std seal · PT | $292.42 | |
| SEJ125X100-30S | 100 mm | 30 mm | Basic (no mounting) · S · std seal · PT | $298.46 | |
| SEJ125X100-50 | 100 mm | 50 mm | Basic (no mounting) · - · std seal · PT | $292.42 | |
| SEJ125X100-50S | 100 mm | 50 mm | Basic (no mounting) · S · std seal · PT | $298.46 | |
| SEJ125X100-50SFA | 100 mm | 50 mm | FA front flange · S · std seal · PT | $344.99 | |
| SEJ125X100-75S | 100 mm | 75 mm | Basic (no mounting) · S · std seal · PT | $298.46 | |
| SEJ125X100-100 | 100 mm | 100 mm | Basic (no mounting) · - · std seal · PT | $292.42 | |
| SEJ125X100-100S | 100 mm | 100 mm | Basic (no mounting) · S · std seal · PT | $298.46 | |
| SEJ125X120-75S | 120 mm | 75 mm | Basic (no mounting) · S · std seal · PT | $311.03 | |
| SEJ125X125-10 | 125 mm | 10 mm | Basic (no mounting) · - · std seal · PT | $304.98 | |
| SEJ125X125-20S | 125 mm | 20 mm | Basic (no mounting) · S · std seal · PT | $311.03 | |
| SEJ125X125-30S | 125 mm | 30 mm | Basic (no mounting) · S · std seal · PT | $311.03 | |
| SEJ125X125-40S | 125 mm | 40 mm | Basic (no mounting) · S · std seal · PT | $311.03 | |
| SEJ125X125-50 | 125 mm | 50 mm | Basic (no mounting) · - · std seal · PT | $304.98 | |
| SEJ125X125-50S | 125 mm | 50 mm | Basic (no mounting) · S · std seal · PT | $311.03 | |
| SEJ125X150-10 | 150 mm | 10 mm | Basic (no mounting) · - · std seal · PT | $317.28 | |
| SEJ125X150-10S | 150 mm | 10 mm | Basic (no mounting) · S · std seal · PT | $323.33 | |
| SEJ125X150-20S | 150 mm | 20 mm | Basic (no mounting) · S · std seal · PT | $323.33 | |
| SEJ125X150-30S | 150 mm | 30 mm | Basic (no mounting) · S · std seal · PT | $323.33 | |
| SEJ125X150-50S | 150 mm | 50 mm | Basic (no mounting) · S · std seal · PT | $323.33 | |
| SEJ125X160-10S | 160 mm | 10 mm | Basic (no mounting) · S · std seal · PT | $335.89 | |
| SEJ125X175-10 | 175 mm | 10 mm | Basic (no mounting) · - · std seal · PT | $329.84 | |
| SEJ125X175-30 | 175 mm | 30 mm | Basic (no mounting) · - · std seal · PT | $329.84 | |
| SEJ125X175-50S | 175 mm | 50 mm | Basic (no mounting) · S · std seal · PT | $335.89 | |
| SEJ125X175-75S | 175 mm | 75 mm | Basic (no mounting) · S · std seal · PT | $335.89 | |
| SEJ125X200-20S | 200 mm | 20 mm | Basic (no mounting) · S · std seal · PT | $348.25 | |
| SEJ125X200-50 | 200 mm | 50 mm | Basic (no mounting) · - · std seal · PT | $342.20 | |
| SEJ125X200-50S | 200 mm | 50 mm | Basic (no mounting) · S · std seal · PT | $348.25 | |
| SEJ125X200-75 | 200 mm | 75 mm | Basic (no mounting) · - · std seal · PT | $342.20 | |
| SEJ125X200-75S | 200 mm | 75 mm | Basic (no mounting) · S · std seal · PT | $348.25 | |
| SEJ125X200-100S | 200 mm | 100 mm | Basic (no mounting) · S · std seal · PT | $348.25 | |
| SEJ125X225-50 | 225 mm | 50 mm | Basic (no mounting) · - · std seal · PT | $354.76 | |
| SEJ125X250-10S | 250 mm | 10 mm | Basic (no mounting) · S · std seal · PT | $373.37 | |
| SEJ125X250-20S | 250 mm | 20 mm | Basic (no mounting) · S · std seal · PT | $373.37 | |
| SEJ125X250-50S | 250 mm | 50 mm | Basic (no mounting) · S · std seal · PT | $373.37 | |
| SEJ125X250-100S | 250 mm | 100 mm | Basic (no mounting) · S · std seal · PT | $373.37 | |
| SEJ125X300-20S | 300 mm | 20 mm | Basic (no mounting) · S · std seal · PT | $398.03 | |
| SEJ125X300-50S | 300 mm | 50 mm | Basic (no mounting) · S · std seal · PT | $398.03 | |
| SEJ125X300-100S | 300 mm | 100 mm | Basic (no mounting) · S · std seal · PT | $398.03 | |
| SEJ125X350-50S | 350 mm | 50 mm | Basic (no mounting) · S · std seal · PT | $422.90 | |
| SEJ125X400-100S | 400 mm | 100 mm | Basic (no mounting) · S · std seal · PT | $447.81 | |
| SEJ125X450-10 | 450 mm | 10 mm | Basic (no mounting) · - · std seal · PT | $466.43 | |
| SEJ125X800-20S | 800 mm | 20 mm | Basic (no mounting) · S · std seal · PT | $655.07 | |
| SEJ125X800-100S | 800 mm | 100 mm | Basic (no mounting) · S · std seal · PT | $655.07 |
Need a combination that is not listed? Request a quote.
Where the SEJ125 Is Used
High-force actuation
Over 6.1 kN at 0.5 MPa for presses, lifting tables and dampers.
Process and material handling
Opens chutes, gates and dampers on bulk-handling equipment.
Pivoting heavy loads
Clevis and trunnion versions swing large doors and platforms.
Choosing the Right SEJ125 Configuration
Start with the stroke. Pick the exact travel your machine needs; a longer stroke adds length, weight and air consumption without adding force. If your length is not listed, request a quote and we will confirm whether it can be built.
Then the stroke adjustment (10-100 mm): pick the amount by which you need to trim the stroke on the machine. The cylinder can be set anywhere between full stroke and full stroke minus that amount.
Then choose the mounting. Basic (no code) uses the cylinder's own mounting holes. This bore is stocked with FA front flange, FTC front trunnion. Foot and flange mountings hold the cylinder rigid for straight-line loads; clevis and trunnion mountings let it pivot when the load moves in an arc.
Finally pick the version: S adds a magnet for position sensors; the standard seal suits general automation; N specifies NBR.
AirTAC SEJ125 FAQ
No. Every SEJ125 gives about 6136 N push and 5734 N pull at 0.5 MPa, whatever the stroke.
The number after the dash is the adjustable range in mm. An SEJ125X100-50, for example, can be set to any stroke between 50 and 100 mm with the rear adjusting screw.
1/2" ports, PT thread as standard.
Basic plus FA front flange, FTC front trunnion. Use foot or flange for straight-line loads, clevis or trunnion when the cylinder must pivot.
Usually yes. Request a quote with the stroke, mounting and version and we will confirm whether it can be built, plus price and lead time.
0.15 to 1.0 MPa operating pressure (proof 1.5 MPa) and -20 to +70 °C on filtered air.
No. You can order a single SEJ125. Orders are processed and handed to the carrier within 3-5 business days.
Buying the SEJ125 from AirtacDistr
Genuine AirTAC parts
Every order code on this page is the AirTAC factory part number. Specifications follow the AirTAC Products Catalog 2026A. About us
Ready in 3-5 business days
That is our time to process the order and hand it to the carrier. No minimum order: a single piece can be ordered.
14-day returns, 1-year warranty
Return within 14 days of delivery; the buyer pays return shipping. The warranty covers defects not caused by misuse. Return policy
Engineering help
Send your application details and we will confirm the right order code, usually within 7-8 hours. Ask us
Page data checked against the live catalog on 2026-09-28.
Request a Quote for the SEJ125
Send the order code, quantity and destination. We confirm price, stock and lead time, usually within 7-8 hours.