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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), 2012
- Errata to ASME B18.2.1-2012
- CONTENTS
- FOREWORD
- ASME B18 COMMITTEE ROSTER
- CORRESPONDENCE WITH THE B18 COMMITTEE
- 1 INTRODUCTION [Go to Page]
- 1.1 Scope [Go to Page]
- 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
- 2 GENERAL DATA FOR BOTH BOLTS AND SCREWS [Go to Page]
- 2.1 Heads [Go to Page]
- 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
- 2.4 Points
- 2.5 Threads [Go to Page]
- 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 [Go to Page]
- 2.11.1
- 2.11.2
- 2.12 Grade and ManufacturerŒs Identification [Go to Page]
- 2.12.1 Identification Symbols.
- 2.12.2 Grade Symbols.
- 2.12.3 Source Symbols.
- 2.13 Quality Assurance
- 3 BOLTS [Go to Page]
- 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
- 3.8 Material
- 3.9 Additional Requirements
- 4 SCREWS [Go to Page]
- 4.1 General
- 4.2 Top of Head [Go to Page]
- 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
- 4.7 Thread Length
- 4.8 Length Tolerances
- 4.9 Material
- 4.10 Additional Requirements
- 5 LAG SCREWS [Go to Page]
- 5.1 General
- 5.2 Head Taper
- 5.3 Bearing Surface
- 5.4 Body Diameter
- 5.5 Reduced Diameter Body
- 5.6 Thread
- 5.7 Thread Length
- 5.8 Material
- 5.9 Additional Requirements
- Figures
[Go to Page]
- Fig. 1 Underhead Fillet for Long Screws
- Fig. 2 Underhead Fillet for Short Screws Threaded Full Length
- Fig. 3 LG, Maximum and LB, Minimum for Short Screws Threaded Full Length
- Tables [Go to Page]
- Table 1 Dimensions of Square Head Bolts
- Table 2 Dimensions of Hex Bolts
- Table 3 Dimensions of Heavy Hex Bolts
- Table 4 Dimensions of Askew Head Bolts
- Table 5 Length Tolerances for Bolts
- Table 6 Dimensions of Hex Cap Screws
- Table 7 Dimensions of Heavy Hex Screws
- Table 8 Dimensions of Hex Flange Screws
- Table 9 Dimensions of Lobed Head Screws
- Table 10 Dimensions of Underhead Fillets
- Table 11 LG, Maximum and LB, Minimum Limitations for Short Screws Threaded Full Length
- Table 12 Maximum Grip Gaging Lengths, LG, and Minimum Body Lengths, LB, for Screws Except Flange Head
- Table 13 Length Tolerances for Screws
- Table 14 Dimensions of Square Lag Screws
- Table 15 Dimensions of Hex Lag Screws
- Table 16 Dimensions of Lag Screw Threads
- MANDATORY APPENDIX I GAGE AND GAGING PRACTICES FOR EXTERNAL LOBED HEAD DRIVE SYSTEM [Go to Page]
- I-1 SCOPE
- I-2 DEFINITIONS
- I-3 GAGE TYPE [Go to Page]
- I-3.1 GO Gages
- I-3.2 NOT GO Gages
- I-4 INSPECTING EXTERNAL CONFIGURATION
- I-5 ACCEPTANCE CRITERIA
- NONMANDATORY APPENDIX A FORMULAS FOR BOLT AND SCREW HEAD DIMENSIONS
- NONMANDATORY APPENDIX B WEIGHT IN POUNDS OF 100 STEEL HEX CAP SCREWS FOR GIVEN DIAMETER/LENGTH COMBINATION
- NONMANDATORY APPENDIX C COUNTERSUNK CENTER HOLES
- NONMANDATORY APPENDIX D SELF-LOCKING ELEMENT AND DRILLED HEAD GUIDELINES [Go to Page]
- D-1 SELF-LOCKING ELEMENT [Go to Page]
- D-2 DRILLED HEAD [Go to Page]
