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ASME B18.2.1 2012 R2021

ASME B18.2.1 2012 R2021

$98.04

ASME B18.2.1 – 2012(R2021) 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 50
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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.

PDF Catalog

PDF Pages PDF Title
3 Errata to ASME B18.2.1-2012
7 CONTENTS
8 FOREWORD
11 ASME B18 COMMITTEE ROSTER
12 CORRESPONDENCE WITH THE B18 COMMITTEE
13 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
14 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
15 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
16 2.12 Grade and ManufacturerŒs 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
17 Tables
Table 1 Dimensions of Square Head Bolts
18 Table 2 Dimensions of Hex Bolts
19 Table 3 Dimensions of Heavy Hex Bolts
20 Table 4 Dimensions of Askew Head Bolts
Table 5 Length Tolerances for Bolts
21 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
22 Table 6 Dimensions of Hex Cap Screws
24 Table 7 Dimensions of Heavy Hex Screws
26 Table 8 Dimensions of Hex Flange Screws
28 Table 9 Dimensions of Lobed Head Screws
29 Table 10 Dimensions of Underhead Fillets
30 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
31 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
32 Table 12 Maximum Grip Gaging Lengths, LG, and Minimum Body Lengths, LB, for Screws Except Flange Head
35 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
36 Table 14 Dimensions of Square Lag Screws
37 Table 15 Dimensions of Hex Lag Screws
Table 16 Dimensions of Lag Screw Threads
39 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
42 NONMANDATORY APPENDIX A FORMULAS FOR BOLT AND SCREW HEAD DIMENSIONS
44 NONMANDATORY APPENDIX B WEIGHT IN POUNDS OF 100 STEEL HEX CAP SCREWS FOR GIVEN DIAMETER/LENGTH COMBINATION
45 NONMANDATORY APPENDIX C COUNTERSUNK CENTER HOLES
46 NONMANDATORY APPENDIX D SELF-LOCKING ELEMENT AND DRILLED HEAD GUIDELINES
D-1 SELF-LOCKING ELEMENT
D-2 DRILLED HEAD

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