How to quickly thread pigtails into tubing

The fastest way to thread pigtails into tubing is to use pre-made threaded inserts or star-type tube inserts, which simplify installation and provide a secure hold.

Quick Installation Methods

1. Threaded Inserts (Star or Metal Type)
   • Star-type inserts are designed to grip the inside of round or square tubing without welding. They expand as you screw them in, providing a strong hold .
   • Metal threaded star inserts fit various tubing diameters (e.g., 1" OD, 16-18 gauge) and thread sizes like 1/4-20, making them versatile for DIY or industrial applications .
   • Installation is fast: simply drill the correct hole, insert the threaded insert, and tighten. No welding or complex machining is required.
2. Tapping Thin-Wall Tubing
   • For thin-wall tubing, you can use a truncated or rolled thread to avoid weakening the tube .
   • Chamfering the tube end and using a serial tap (#2 or similar) allows you to cut threads quickly. Using a slip-fit cap with anaerobic adhesive can also save time while maintaining strength .
3. Pigtail Hose Threading for Gas Applications
   • For propane or natural gas pigtails, thread the 1/4" NPT fitting into the regulator first using Teflon tape or thread glue, then attach the POl side to the tank valve. Check for leaks with soapy water and tighten as needed .
   • Avoid bending the tube sharply to prevent cracking, and ensure all connections are fully seated.

Pricing

• Star-type threaded inserts: Typically range from $10–$25 for a pack of 4–20 inserts, depending on size and material .
• Pigtail hoses (15-inch copper): Around $20–$30 for a 2-pack, including Teflon tape for sealing .
• Threading tools: Tap sets for small tubing can cost $15–$50, depending on quality and number of sizes included.

Tips for Efficiency

• Pre-drill and chamfer tubing ends to reduce threading time.
• Use inserts that match your tubing gauge to avoid stripping threads.
• For gas applications, always test for leaks after installation.
• Consider using triple-start threads or rolled threads for faster engagement in thin-wall tubing . By using threaded inserts or pre-made pigtail fittings, you can significantly reduce installation time while ensuring a secure and leak-free connection.