How do you use a thread height gauge?

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FYOU PMEC, supply a complete line of Thread Gauges listed in the API Spec 5B ，API Spec 7-2, and API Spec 11B. Also, we provide its measuring gauges. To find out more information on our products, please contact us by E-mail: sales@fyougauges.com. We will provide you the best possible solutions for you as quickly as we can.

1.Definition

The height of thread shall be defined as the distance between the crest and root, normal to the axis of the thread.

Note: A certain number of threads with imperfect crests are permissible on the pipe under the requirements of Section 4. When threads with imperfect crests occur within the perfect thread length on the pipe, the last point of height measurement should be shifted to the last thread root having a full crest on each side.

2.Gauge Contact Points

The contact points for thread height gauges for line pipe and round threads shall be conical in shape with a maximum included angle of 50 degrees and shall not contact the thread flank. Height gauges for buttress threads can use a cone point or a ball type point provided the contact point does not contact the thread flanks and does not exceed 0.092 in. (2,34 mm) diameter.

3.Height Gauges

Thread height shall be measured with gauges of the types illustrated as below. Such gauges for line pipe and round threads may have indicators graduated to register the actual thread height or the deviation in thread height, as illustrated in as bellow. Check blocks as shown as below, Detail A shall be provided for checking the height gauge. 8uttress threads shall be measured with gauges of the type illustrated in Figure 15 registering error in thread height in 0.0005 in. (0,013 mm) increments. Gauges for size 16 and larger buttress threads shall be provided with a step-type anvil. Check blocks of the step type as shown as bellow, Detail B, shall be provided for checking the height gauge.

4.Adjustments

Gauges shall be adjusted when applied to the U-groove for the type of thread to be measured. Gauges having indicators for determining the deviation in thread height shall be adjusted to register zero when applied to the applicable groove. Gauges having indicators for determining the actual thread height shall be adjusted to register the proper thread height when applied to the applicable groove. For V-threads and round threads, the gauge shall also be applied to the applicable V-groove for the threads to be measured. The gauge reading on the V-groove check block shall not vary more than 0.0005 in. (0,013 mm) from its reading on the U-groove check block. If it does not so register, the contact point has probably become worn or damaged and shall be replaced. For thread height gauges of the type illustrated in Figure 16, if the check block cannot be positioned flat on the anvil with the pressure are applied, the arm shall be shifted out of the way to prevent contact with the check block during adjustments or checks.

5. External Threads and Internal Threads

The thread height gauges shall be used for all external and all internal threads. The tip of the penetrator shall be placed in the proper thread groove with the anvil in a line parallel to the axis of the thread and rest on the crests of the adjacent threads, and the gauge oscillated through a small arc on each side of the position normal to the taper cone. For gauges graduated to measure the actual thread height, the minimum reading on the indicator shall be taken as the actual thread height.

How to Order?

When you order, please let me just know the thread type and range need be measured, we will provide you the best solutions and best quotations. More details or any questions please contact: sales@fyougauges.com or WhatsApp/Wechat: +86 13962168423