NPT vs. Straight Thread vs. BSPP vs. BSPT | Pipe Thread Types Explained
Confused about pipe thread types? Darrin from Specialty Sales breaks down the four most common threads we see: NPT (National Pipe Thread), Straight Thread (With O-Ring), BSPP (British Standard Parallel), and BSPT (British Standard Tapered). Learn how to identify each type, which sealants to use, and why NPT and BSPT are NOT interchangeable even though they look similar.
What You'll Learn:
✅ NPT (National Pipe Thread) - tapered threads that seal metal-to-metal
✅ Straight Threads - O-ring sealed, no taper, reusable connections
✅ BSPP vs. BSPT - British standards and how they differ from US threads
✅ Why NPT and BSPT cannot be mated (different thread angles)
✅ When to use thread sealant vs. O-rings
✅ Pro tips for identifying thread types
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