Tweco 1340-1400 Nozzle Insulator 400A Mig Gun

Product Description

The TWECO 1340-1400 is a coarse thread nozzle insulator designed for use with Tweco No. 4 MIG welding guns rated up to 400 amps. The insulator fits between the nozzle and the gun body, providing electrical isolation and protecting the front end assembly from heat and spatter during the welding process. Replacement of worn nozzle insulators is routine preventive maintenance that keeps MIG guns operating at full efficiency. This part is a standard consumable stocked by welding technicians and shop maintenance personnel working with Tweco-style MIG equipment.

This nozzle insulator is suited for heavy-duty MIG welding applications where a Tweco No. 4 gun is in service. Typical environments include fabrication shops, structural steel work, and industrial maintenance operations running higher-amperage wire-feed processes. At 0.23 pounds and compact dimensions, it is a lightweight consumable that should be kept on hand as a regular spare to minimize downtime during gun servicing.

Key Features

• Coarse thread design for secure nozzle retention on Tweco No. 4 MIG guns
• Rated for use with guns up to 400 amps
• Provides electrical isolation between the nozzle and gun body
• Compact and lightweight for easy field replacement
• Sold individually (minimum order quantity: 2)

Compatibility

Designed for use with Tweco No. 4 MIG guns rated up to 400 amps. Verify thread type before installation to confirm fitment with your specific gun configuration.

Installation Notes

Installation and replacement should be performed by a qualified welding technician. Always disconnect the MIG gun from the wire feeder and ensure the power source is off before servicing front-end consumables. Use the appropriate spanner or nozzle wrench to avoid damaging the threads on the insulator or gun body. Do not overtighten, as this can crack the insulator body and compromise electrical isolation.

Technical Specifications

• Amperage Rating: 400 amps
• Thread Type: Coarse thread
• Length: 0.8 inches
• Width: 1.1 inches
• Height: 0.8 inches
• Weight: 0.23 pounds
• Sold As: Each (minimum order quantity: 2)
• UPC: 608246061634

Standard Information

• Brand: TWECO
• Manufacturer Part Number: 1340-1400