17 Series Air-Cooled Torch: 25 Dinse vs 35 Dinse Flow-Thru
By MIG/TIG/Stick Welders & Plasma Cutters | USA Weld – HTP ... | Published: 2026-11-02
Category: Comparisons
Compare the 25 Dinse and 35 Dinse 17 Series air-cooled TIG torches. Learn which power connection and gas setup fits your welder and how to choose.
Quick answer
Choose the 25 Dinse torch if your welder has a 3/8-inch Dinse socket and you prefer a standard gas fitting; choose the 35 Dinse flow-thru torch if your machine uses a 1/2-inch Dinse connection and you want gas routed through the power cable. Both are 150A air-cooled 17 Series torches.
Power connection: 25 Dinse vs 35 Dinse
The main difference is the power connector. The 25 Dinse uses a 3/8-inch outside diameter plug, while the 35 Dinse uses a 1/2-inch outside diameter plug. These are not interchangeable without an adapter, so check your welder’s socket before ordering.
A larger Dinse connector generally handles higher current, but both torches are rated at 150A. The choice is about matching your machine, not about getting more amperage.
Gas delivery: separate fitting vs flow-thru
The 25 Dinse torch has a separate 5/8-18 right-hand gas fitting, so you run a gas hose alongside the power cable. The 35 Dinse flow-thru torch routes gas through the power cable connection, which can simplify setup and reduce cable clutter.
Flow-thru systems require a compatible welder or adapter that supplies gas through the Dinse socket. If your machine does not support flow-thru gas, the 35 Dinse torch will not work without modification.
Cable flexibility and cold-weather use
Both torches use a one-piece cable made from flexible silicone rubber with a nylon braided overlay. The cable stays flexible in cold weather, which matters if you weld in an unheated shop or outdoors.
Key trade-offs
- 25 Dinse with separate gas fitting: Requires a 3/8-inch Dinse socket and a separate gas hose to the 5/8-18 fitting. Works with most standard TIG setups and gives you independent control over gas hose routing. Check that your welder has a 3/8-inch Dinse socket and a standard gas outlet.
- 35 Dinse flow-thru gas: Uses a 1/2-inch Dinse socket and routes gas through the power cable. Fewer hoses to manage, but only works if your welder supports flow-thru gas. Confirm your machine’s Dinse socket size and flow-thru capability before ordering.
- Cable flexibility: Both torches share the same flexible silicone cable that stays supple in cold weather, so ergonomics are similar. Choose based on connection compatibility, not cable feel.
Product facts
- 12' 17 Series Air-Cooled Torch w/25 Dinse & 5/8"-18 Gas Fitting: 17 Series (150A) air-cooled torch with 25 Dinse (3/8" OD) power connection and 5/8"-18 RH gas fitting. Fits welders with a 3/8-inch Dinse socket and a standard gas outlet, so you can use a separate gas hose.
12' 17 Series Air-Cooled Torch w/25 Dinse & 5/8"-18 Gas Fitting - 17 Series (150A) Air-Cooled Torch w/35 Dinse Power Connection & Flow Thru Gas: 17 Series (150A) air-cooled torch with 35 Dinse (1/2" OD) power connection and flow-thru gas. Combines power and gas in one connection for a cleaner setup on compatible machines.
17 Series (150A) Air-Cooled Torch w/35 Dinse Power Connection & Flow Thru Gas
Which torch fits your setup?
Best for
- Welders with a 3/8-inch Dinse socket and standard gas fitting
- Users who prefer a separate gas hose for easy routing or replacement
Not for
- Machines with a 1/2-inch Dinse socket (choose the 35 Dinse model)
- Setups that require gas through the power connection
