In the manufacturing industry, the production of components is governed by international standards. Each of the standards has about set tolerances and dimensional limits, which the manufactured component should meet for it to be accepted in the industry. The dimensions, therefore, need to be examined and checked, and the findings of these checks are recorded. A complete series of metrology equipment is available in the market for measuring lengths, diameters, and surface finish.
There are several methods and tools available for checking thread dimensions when a threaded component is manufactured. The effective pitch diameter of a thread is measured using a thread micrometer, and it is fitted with a conical anvil and a vee. This can also be achieved through thread wire sets and standard flat-face micrometers. The thread gauges are used for checking whether the thread dimensions fall under or over dimensional limits. The thread gauges are ground and hardened to accurate dimensions which meet the specification for required standards.
There are several thread gauges that are available for purchase in the market. The thread gauge is basically used for measuring the dimensions of the thread, including the diameter, pitch, and thread angle of the screw thread. Since there are several options available in the market, it is crucial for the customers or clients to understand and determine their own functional requirements before placing an order for any specific type of thread gauge in the market. Each thread gauge comes with its own specs, features, build quality, and price.
Understanding UNEF thread gauges
The UNEF thread gages are one of the highest-selling thread gauges in the market. The UNEF thread gauge stands for United National Extra Fine thread gauge. The UNEF essentially means TPI must be big, and for the typical UNEF thread, the obvious TPI would be 18, 20, 24, 28, and 32. The extra fine thread series or the UNEF is applicable where finer thread pitches are needed and also for short engagement lengths and thin-walled tubes, ferrules, couplings, or nuts. It is also applicable in conditions that have been mentioned here for fine threads.
The UNEF thread gage sold by Gaugestools is made of delicate material called steel-Gcr15, which is made of oil hardened tool and has high wear resistance. It has a hardness of 58-62 HRC. The standard tolerance for the product is plug 2b & ring 2A. The internal tolerance for thread class is 1B, 2B, and 3B. The external tolerance for thread class is 1A, 2A, and 3A.
In terms of sizes, there is a wide range of standard sizes provided by the company, and you can check the Gaugestools website for full details. Some of the standard size available on their official site are No 12-32 UNEF, 1/4-32 UNEF , 5/16-32 UNEF, 3/8-32 UNEF, 7/16-28 UNEF, 1/2-28 UNEF, 9/16-24 UNEF, 5/8-24 UNEF and 1 3/8-18 UNEF, 1 1/2-18 UNEF, 1 9/16-18 UNEF, 1 5/8-18 UNEF, and 1 11/16-18 UNEF others. You can visit the product listing page for more information, including specs and features, on these products.