ASME B18.13 2017 R2022

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ASME B18.13 – 2017 (R2022) Screw and Washer Assemblies–SEMS (Inch Series)

Published By	Publication Date	Number of Pages
ASME	2017	30

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Description

This Standard covers general and dimensional data pertinent to the various types of screw and captive washer assemblies, otherwise known as SEMS. SEMS products may include screws, tapping screws, or bolts in sizes #0 through ½” diameters in various grades and materials. The word SEMS is recognized in the United States as a generic term applicable to screw and washer assemblies. Also included in this Standard are appendices to illustrate the relative proportions of plain and conical washer SEMS.

PDF Catalog

PDF Pages	PDF Title
4	CONTENTS
5	FOREWORD
7	ASME B18 COMMITTEE Standardization of Bolts, Nuts, Rivets, Screws, Washers, and Similar Fasteners
8	CORRESPONDENCE WITH THE B18 COMMITTEE
10	1 INTRODUCTION 1.1 Scope 1.2 Use and Application 1.3 Types of SEMS 1.4 Screw Heads 1.5 Dimensions 1.6 Options 1.7 Responsibility for Modification 1.8 Terminology 1.9 Reference Standards
11	Tables Table 1 Dimensions of Helical Spring Lock Washers for Socket Head Cap Screw SEMS
12	Table 2 Dimensions of Helical Spring Lock Washers for SEMS With Machine and Tapping Screws Having Machine Screw Thread Diameter–Pitch Combinations
13	Table 3 Dimensions of Helical Spring Lock Washers for SEMS With Screws Having Type B Tapping Screw Thread Diameter–Pitch Combinations
14	Table 4 Dimensions of Internal Tooth Lock Washers for SEMS
15	Table 5 Dimensions of External Tooth Lock Washers for SEMS
16	Table 6 Dimensions of Conical Spring Washers for SEMS
18	Table 7 Dimensions of Plain Washers for SEMS
19	1.10 Designation 1.11 Part Identifying Number PIN Code System 1.12 Manufacturing 1.13 Quality Assurance
20	2 GENERAL DATA 2.1 Machine Screws for SEMS 2.2 Tapping Screws for SEMS 2.3 Socket Head Cap Screws for SEMS Figures Fig. 1 Unthreaded Length on Screws With Machine Screw Thread Diameter–Pitch Combinations Fig. 2 Unthreaded Length on Tapping Screws With Spaced Thread Diameter–Pitch Combinations
21	2.4 Hex Cap Screws for SEMS 2.5 Applicability of Screw Sizes 2.6 Washers for SEMS 2.7 Finish 2.8 Embrittlement Test 3 DATA FOR HELICAL SPRING LOCK WASHER SEMS 3.1 Application 3.2 Specifications 3.3 Washer Components 3.4 Screw Components
22	4 DATA FOR TOOTH LOCK WASHER SEMS 4.1 Application 4.2 Specifications 4.3 Washer Components 4.4 Screw Components 5 DATA FOR CONICAL SPRING WASHER SEMS 5.1 Application 5.2 Washer Components Fig. 3 Verification of Bearing Width on Helical Spring Lock Washers
23	5.3 Screw Components 5.4 Assembly Detail 5.5 Assembly Considerations 6 DATA FOR PLAIN WASHER SEMS 6.1 Application 6.2 Washer Components Fig. 4 Enlarged Conical Spring Washer Section and Tooth Washer Dimensions
24	6.3 Screw Components Fig. 5 Conical Spring Washer Twist Test
26	NONMANDATORY APPENDIX A RELATIVE PROPORTIONS OF SCREW HEADS AND PLAIN OR CONICAL SPRING WASHERS
27	Table A-1 Relative Proportions of Screw Heads and Plain or Conical Spring Washers