Keeping up with all the different thread standards is a challenge. It’s important that you don’t make errors as this can lead to different problems. These can include losing money, wasting time, and compromising safety. To make sure you avoid these problems, here is a step-by-step guide to identifying the right thread standard.
Tools You Will Need
Before you start the steps in determining the thread standard, make sure you have the proper tools that will help you in this process.
The caliper is useful in measuring a male thread’s exterior diameter and a female thread’s interior diameter. It will help you come up with the most precise measurements. This tool is strongly recommended in identifying thread standards. However, if you don’t have one, you can use a straight steel ruler.
This tool will measure the threads per inch and will help you determine their pitch.
Step 1: Identify the Fitting’s Gender
Identify whether the fitting is male or female by locating the threads. The fitting is male if the threads are found on the outside. Meanwhile, the fitting is female if the threads are located inside the hex nut.
Step 2: Check If the Threads Are Parallel or Tapered
The next step is to identify whether the threads are parallel or tapered. Parallel threads will have the same diameter from both ends. If the diameter increases on the male end and decreases on the female end, then the threads are tapered.
Step 3: Identify the Size of the Threads
This time, identify the nominal diameter of the threads. You can achieve this by using a caliper. For parallel threads, you can measure any full thread, but for the tapered ones, measure the fourth or fifth full thread.
Step 4: Determine the Pitch
Determine the pitch of the threads from crest to crest. This is to see the number of crests there are in an inch of the thread. Use a pitch gauge and check the thread against each form until you find its match. To avoid mistakes, repeat the process and make sure you have the exact match.
Step 5: Determine the Thread Standard
The last step is to identify the thread standard. Gather all the information you have – the thread category, thread size, and the pitch. Refer to a thread identification guide and compare your info to find the right standard.