34 THE DISTRIBUTOR’S LINK Larry Borowski President GREENSLADE & COMPANY INC. 2234 Wenneca Avenue, Fort Worth, TX 76102 TEL 817-870-8888 FAX 817-870-9199 EMAIL sales1@greensladeandcompany.com WEB www.greensladeandcompany.com THE PROPER GAGING OF INCH NUT THREADS dimensional tables, in accordance with American Society of Mechanical Engineers, ASME B1.1. 3.10.2 - Thread Gaging. Unless otherwise specified by the purchaser, gaging for screw thread acceptability shall be in accordance with Gaging System 21 as specified in American Society of Mechanical Engineers, ASME B1.3. It is important for suppliers of inch nuts to understand the standards and gaging practices required by those standards to avoid customer complaints and rejections. This article will provide the list of standards that cover the requirements for inch nuts and the critical thread gaging practices that apply. Most inch nuts are manufactured according to dimensional standards published by the American Society of Mechanical Engineers (ASME). ASME B18.2.2 covers the exterior dimensions such as the nut’s thickness, width across flats, and width across corners. This standard covers all types of nuts including square, slotted, hex flange, jam, heavy, etc. Though the external appearance of the nuts may differ due to application, one thing remains consistent, the threads. ASME B1.1 covers inch nut thread dimensions. ASME B1.2 covers the thread gages and thread gaging practices. Below are excerpts from reference standards that apply to inch nut thread dimensions and gaging practices. ASME B18.2.2 - Section 3.10: Threads 3.10.1 - Threads shall be Unified Standard, Class 2B, of the series specified in the notes on the respective TECHNICAL ARTICLE ASME B1.1 - Section 1.7: Acceptability Acceptability of product threads shall be in accordance with ASME B1.3. Gages and gaging shall be in accordance with ASME B1.2. ASME B1.2 - Section 4: Types of Gages For Product Internal Thread 4.1: GO Working Thread Plug Gages (Table 2 - Gage 1.1) 4.1.1 - Purpose and Use. The GO thread plug gage inspects the maximum-material GO functional limit, A1, of product internal thread. The GO thread gage represents the maximum-material GO functional limit of the product internal thread, and its purpose is to assure interchangeable assembly of maximum material mating parts. GO thread plug gages must enter and pass through the full-threaded length of the product freely. CONTINUED ON PAGE 114
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