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ASME B18.2.1 2012

ASME B18.2.1 2012

$98.04

ASME B18.2.1 Square, Hex, Heavy Hex, and Askew Head Bolts and Hex, Heavy Hex, Hex Flange, Lobed Head, and Lag Screws (Inch Series)

Published By Publication Date Number of Pages
ASME 2012 48
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This Standard covers the complete general and dimensional data for nine product types of inch series square and hex bolts and screws. Hex flange head and lobed head designs are new in this revision, as are screw sizes 1 5/8, 1 7/8, and 3 1/8 through 6 inches. Appendices covering gages and gaging information plus formulas on which dimensional data are based are included. Heavy hex structural bolts, formerly covered in ANSI B18.2.1, are now covered in ASME B18.2.6. Key changes to this 2010 revision include: Additional head types (hex flange and lobed heads) and additional sizes commonly used (1-5/8, 1-7/8, and sizes 3-1/8 through 6 inches) have been added to make the standard more comprehensive. The organization of the standard has been changed

PDF Catalog

PDF Pages PDF Title
5 CONTENTS
6 FOREWORD
9 ASME B18 COMMITTEE Standardization of Bolts, Nuts, Rivets, Screws, Washers, and Similar Fasteners
10 CORRESPONDENCE WITH THE B18 COMMITTEE
11 1 INTRODUCTION
1.1 Scope
1.1.1
1.1.2
1.2 Comparison With ISO Standards
1.3 Dimensions
1.4 Options
1.5 Terminology
1.6 Referenced Standards
12 2 GENERAL DATA FOR BOTH BOLTS AND SCREWS
2.1 Heads
2.1.1 Top of Head.
2.1.2 Width Across Flats.
2.1.3 Head Height.
2.1.4 True Position of Head.
2.2 Bolt or Screw Length
2.3 Body Diameter
13 2.4 Points
2.5 Threads
2.5.1 Thread Standard.
2.5.2 Thread Class.
2.5.3 Thread Series.
2.5.4 Incomplete Thread Diameter.
2.5.5 Thread Acceptability.
2.6 Straightness
2.7 Optional Machining: Countersunk Center Holes, Locking Elements, and Drilled Holes
2.8 Materials
2.9 Finish
2.10 Workmanship
2.11 Designation
2.11.1
2.11.2
14 2.12 Grade and Manufacturerƅā€™s Identification
2.12.1 Identification Symbols.
2.12.2 Grade Symbols.
2.12.3 Source Symbols.
2.13 Quality Assurance
3 BOLTS
3.1 Surface Condition
3.2 Head Taper
3.3 Bearing Surface
3.4 Body Diameter
3.5 Reduced Diameter Body
3.6 Length Tolerance
3.7 Thread Length
15 Tables
Table 1 Dimensions of Square Head Bolts
16 Table 2 Dimensions of Hex Bolts
17 Table 3 Dimensions of Heavy Hex Bolts
18 Table 4 Dimensions of Askew Head Bolts
Table 5 Length Tolerances for Bolts
19 3.8 Material
3.9 Additional Requirements
4 SCREWS
4.1 General
4.2 Top of Head
4.2.1 Hex Cap and Heavy Hex Cap Screws.
4.2.2 Hex Flange and Lobed Head Screws.
4.3 Washer Face
4.4 Bearing Surface Runout
4.5 Fillet
4.6 Body Diameter
20 Table 6 Dimensions of Hex Cap Screws
22 Table 7 Dimensions of Heavy Hex Screws
24 Table 8 Dimensions of Hex Flange Screws
26 Table 9 Dimensions of Lobed Head Screws
27 Table 10 Dimensions of Underhead Fillets
28 Figures

Fig. 1 Underhead Fillet for Long Screws
Fig. 2 Underhead Fillet for Short Screws Threaded Full Length
Table 11 LG, Maximum and LB, Minimum Limitations for Short Screws Threaded Full Length
29 4.7 Thread Length
4.8 Length Tolerances
4.9 Material
4.10 Additional Requirements
5 LAG SCREWS
5.1 General
5.2 Head Taper
5.3 Bearing Surface
Fig. 3 LG, Maximum and LB, Minimum for Short Screws Threaded Full Length
30 Table 12 Maximum Grip Gaging Lengths, LG, and Minimum Body Lengths, LB, for Screws Except Flange Head
33 5.4 Body Diameter
5.5 Reduced Diameter Body
5.6 Thread
5.7 Thread Length
5.8 Material
5.9 Additional Requirements
Table 13 Length Tolerances for Screws
34 Table 14 Dimensions of Square Lag Screws
35 Table 15 Dimensions of Hex Lag Screws
Table 16 Dimensions of Lag Screw Threads
37 MANDATORY APPENDIX I GAGE AND GAGING PRACTICES FOR EXTERNAL LOBED HEAD DRIVE SYSTEM
I-1 SCOPE
I-2 DEFINITIONS
I-3 GAGE TYPE
I-3.1 GO Gages
I-3.2 NOT GO Gages
I-4 INSPECTING EXTERNAL CONFIGURATION
I-5 ACCEPTANCE CRITERIA
40 NONMANDATORY APPENDIX A FORMULAS FOR BOLT AND SCREW HEAD DIMENSIONS
42 NONMANDATORY APPENDIX B WEIGHT IN POUNDS OF 100 STEEL HEX CAP SCREWS FOR GIVEN DIAMETER/LENGTH COMBINATION
43 NONMANDATORY APPENDIX C COUNTERSUNK CENTER HOLES
44 NONMANDATORY APPENDIX D SELF-LOCKING ELEMENT AND DRILLED HEAD GUIDELINES
D-1 SELF-LOCKING ELEMENT
D-2 DRILLED HEAD

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