Nozzle Insulator – Tweco #4 Nozzle Insulator (34CT) and #5 Nozzle Insulator (35CT)
R127,08
ypical Applications:
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Engineering shops
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Truck building
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Shipyards
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Construction welding
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Anywhere #4 Tweco guns are used and where reliability, heat resistance is needed.
#5 / 35CT Nozzle Insulator (Tweco Classic No. 5 / 35 Series Coarse Thread)
Common Names / References:
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35CT #5
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TWC 35CT #5
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Tweco style / coarse thread insulator for #5 gun
Features & Typical Specifications:
| Attribute | Details |
|---|---|
| Material | Similar to #4: high heat‐resistant insulative plastic / composite materials, some heavy duty copper‐type or reinforced versions. |
| Compatibility | Fits Tweco Classic #5 MIG Guns (up to ~500 A in many cases) coarse‐thread (35 series). Also compatible with 25CT nozzle series in many cases. |
| Duty / Use Case | More heavy duty than #4; used where higher currents, robust performance needed. |
| Size / Dimensions (approx.) | One listing gives ~48 mm length, ~25 mm width, inner base diameter ~13 mm, inner tip ~23 mm. Packaged sometimes in 5‐packs or individually. |
| Other Features | Coarse threads so it matches the coarse‐thread nozzle series; constructed to resist spatter buildup, thermal degradation. |
What is a Nozzle Insulator
A nozzle insulator (also called “threaded insulator,” “coarse-thread insulator,” etc.) is a heat‐resistant, electrically insulating component used in MIG welding guns. It sits between the conduct tube (or contact tip assembly) and the outer nozzle. Its purposes include:
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Preventing heat transfer from the nozzle to other internal parts
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Helping maintain correct electrical insulation so the weld arc behaves properly
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Withstanding mechanical and thermal stress, spatter, etc.
#4 / 34CT Nozzle Insulator (Tweco Classic No. 4 / 34 Series Coarse Thread)
Common Names / References:
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34CT #4
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TWC 34CT #4
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Tweco style / coarse thread insulator for #4 gun
Features & Typical Specifications:
From various suppliers:
| Attribute | Details |
|---|---|
| Material | Usually a heat‐resistant plastic / insulating material, sometimes coppered heavy duty versions for better heat handling. |
| Compatibility | Fits Tweco Classic #4 MIG guns (“34 series” coarse‐thread). Also with parts labeled 24CT / 34CT in many consumables catalogs. |
| Duty / Use Case | Medium to heavy duty welding (especially where higher currents, spatter, heat are factors). Used with solid or flux‐cored wire, steel, stainless steel, etc. |
| Size / Dimensions (approx.) | Examples: ~2.7 cm width, ~5.0 cm length, height ~2.7 cm; weight around 0.09 kg in one supplier’s specs. |
| Special Versions | “Heavy duty” insulators (more robust, better materials) exist. Some are two‐piece fixed gas‐nozzle in combination, optimized for more demanding work. |
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