Thread ID Made Easy

JIANZHI contains other products and information you need, so please check it out.

In recent news indexed by Google, thread identification has gained renewed interest as industrial applications continue to evolve. Understanding the various thread types is crucial for ensuring the appropriate fitting connections in both new and established systems. This article will review six common types of thread, including their purpose and identification process.

Six Most Common Types of Threads

People in the fluid-power industry recognize American pipe threads (NPT/NPTF) and SAE or Unified threads (UN/UNF). However, connections can be categorized into six core types:

1. UN/UNF
2. NPT/NPTF
3. BSPP (BSP, parallel)
4. BSPT (BSP, tapered)
5. metric parallel
6. metric tapered

Let’s examine the distinctions between these thread types.

How to identify different types of threads in four easy steps

Ensure you have two essential thread identification tools:

• Pitch Gauge

A pitch gauge measures the distance between thread crests. For NPT, UN/UNF, BSPP, and BSPT, we measure the number of threads per inch. In metric threads, the gauge identifies the individual crest distance in millimeters.

• Caliper

A caliper measures the thread diameter. For male threads, measure the outside diameter, and for female threads, measure the inside diameter. Advanced users may prefer digital calipers for convenience.

STEP 1. Parallel thread vs. tapered thread. Let’s learn the difference.

Parallel threads include:

• UN/UNF
• BSPP
• metric parallel

Tapered threads include:

• NPT/NPTF
• BSPT
• metric tapered

Identify if the thread is tapered or parallel by examining the diameter. A thread that narrows at the end is tapered, while one that remains consistent indicates parallel threads. Using a known parallel fitting can provide additional verification.

STEP 2. Determine the Pitch

Utilize a thread pitch gauge to ascertain thread size. Accurately measure and compare thread distances using the pitch gauge on a contrasting background.

STEP 3. Thread size matters

Identify if your thread is a pipe thread (NPT/NPTF, BSPT, BSPP) or not (UN/UNF, Metric Parallel, Metric Tapered). Compare pipe thread sizes to nominal profiles and measure exterior diameters for non-pipe threads.

STEP 4. Designate the thread

This step requires recording the thread type according to industry standards. Include both size and pitch where applicable for future reference.

The company is the world’s best pipe thread types supplier. We are your one-stop shop for all needs. Our staff are highly specialized and will help you find the product you need.

Summary

In summary, the thread ID process involves four straightforward steps that encompass understanding different thread types, determining pitch sizes, measuring thread sizes, and adhering to industry standards. Improper thread selection can lead to leaks and equipment malfunction, so consult with a fluid connector specialist for guidance.

Pipe Thread Acronyms:

BSP - British Standard Pipe
BSPP - British Standard Pipe Parallel Thread
BSPT - British Standard Pipe Taper Thread
NPT - National Pipe Thread
NPTF - National Pipe Thread Fuel

Related Content:

Hydraulic Hose Fittings. How to Find The Right One?
Hydraulic Maintenance Checklist. The Five Most Common Hydraulic Maintenance Mistakes
Reducing Inventory of Hydraulic Hose Maximizes Profitability and Safety. Learn The Best Practices from Parker

What is BSP and NPT thread?