• ASME B18.2.1 : 2012

    Superseded A superseded Standard is one, which is fully replaced by another Standard, which is a new edition of the same Standard.

    SQUARE, HEX, HEAVY HEX, AND ASKEW HEAD BOLTS AND HEX, HEAVY HEX, HEX FLANGE, LOBED HEAD, AND LAG SCREWS (INCH SERIES)

    Available format(s):  Hardcopy, PDF

    Superseded date:  14-03-2022

    Language(s): 

    Published date:  01-01-2012

    Publisher:  American Society of Mechanical Engineers

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    Table of Contents - (Show below) - (Hide below)

    Foreword
    Committee Roster
    Correspondence With the B18 Committee
    1 Introduction
    2 General Data for Both Bolts and Screws
    3 Bolts
    4 Screws
    5 Lag Screws
    Mandatory Appendix
    I - Gage and Gaging Practices for External Lobed Head
        Drive System
    Nonmandatory Appendices
    A - Formulas for Bolt and Screw Head Dimensions
    B - Weight in Pounds of 100 Steel Hex Cap Screws for
        Given Diameter/Length Combination
    C - Countersunk Center Holes
    D - Self-Locking Element and Drilled Head
        Guidelines

    Abstract - (Show below) - (Hide below)

    Describes the dimensional requirements for nine product types of inch series bolts and screws recognized as American National Standard.

    General Product Information - (Show below) - (Hide below)

    Development Note Supersedes FF B 561 (03/2004)
    Document Type Standard
    Product Note NEW CHILD ERR IS NOW ADDED
    Publisher American Society of Mechanical Engineers
    Status Superseded
    Superseded By
    Supersedes

    Standards Referenced By This Book - (Show below) - (Hide below)

    IEEE C135.90-2014 IEEE Standard for Pole Line Hardware for Overhead Line Construction
    ASME B31.8 : 2016 Gas Transmission and Distribution Piping Systems
    MIL V 24624 : 0 VALVE, BUTTERFLY, WAFER AND LUG STYLE, SHIPBOARD SERVICE
    FED-STD-H28 Revision A:1994 Screw-Thread Standards for Federal Services
    AWWA C500 : 2009 METAL-SEATED GATE VALVES FOR WATER SUPPLY SERVICE
    ANSI Z21.58-2018/CSA 1.6-2018 Outdoor cooking gas appliances
    SAE J 2295 : 2016 FASTENER PART STANDARD - CAP SCREWS, HEX, HEAVY HEX AND HEAVY HEX STRUCTURAL BOLTS, AND HEX NUTS (INCH DIMENSIONED)
    ASTM F 1144 : 1998 Standard Specification for Manhole Cover Assembly, Bolted, Semi-Flush, Oiltight and Watertight, Hinged
    CAN/CSA-Z662-15 Oil and gas pipeline systems
    ASME B16.47 : 2017 LARGE DIAMETER STEEL FLANGES: NPS 26 THROUGH NPS 60 METRIC/INCH STANDARD
    ASME B16.1 : 2015 Gray Iron Pipe Flanges and Flanged Fittings: Classes 25, 125, and 250
    MIL-V-24619 Base Document:1983 VALVE, QUICK CLOSING, FOR SATURATED STEAM SERVICE
    MSS SP 9 : 2013 SPOT FACING FOR BRONZE, IRON AND STEEL FLANGES
    ASTM F 901 : 2001 Standard Specification for Aluminum Transmission Tower Bolts and Nuts
    ASTM F 1143 : 1998 : R2007 Standard Specification for Manhole Cover Assembly, Bolted, Raised, Oiltight and Watertight
    AWWA C223 : 2013 FABRICATED STEEL AND STAINLESS STEEL-TAPPING SLEEVES
    API 12F CHINESE : 2008 SPECIFICATION FOR SHOP WELDED TANKS FOR STORAGE OF PRODUCTION LIQUIDS
    ASTM A 449 : 2014 : REDLINE Standard Specification for Hex Cap Screws, Bolts and Studs, Steel, Heat Treated, 120/105/90 ksi Minimum Tensile Strength, General Use
    API 12D CHINESE : 2008 SPECIFICATION FOR FIELD WELDED TANKS FOR STORAGE OF PRODUCTION LIQUIDS
    ASME B16.5 : 2017 PIPE FLANGES AND FLANGED FITTINGS: NPS 1/2 THROUGH NPS 24 METRIC/INCH STANDARD
    CSA 1.8 : 2016 GAS FOOD SERVICE EQUIPMENT
    MIL V 17547 : A VALVES, CHECK, BRONZE (NAVY)
    IEEE 810-2015 IEEE Standard for Hydraulic Turbine and Generator Shaft Couplings and Shaft Runout Tolerances
    MIL V 13803 : E VALVE, GATE, DOUBLE DISC, CAST IRON OR STEEL
    ASME B31.1 : 2016 POWER PIPING
    ANSI Z21.96 : 2014 PORTABLE WATER HEATERS FOR OUTDOOR USE
    ANSI Z21.5.2-2016/CSA 7.2:2016 GAS CLOTHES DRYERS, VOLUME 2, TYPE 2 CLOTHES DRYERS
    AWWA C228 : 2014 STAINLESS-STEEL PIPE FLANGE JOINTS FOR WATER SERVICE - SIZES 2 IN. THROUGH 72 IN. (50 MM THROUGH 1,800 MM)
    MSS SP 110 : 2010 BALL VALVES THREADED, SOCKET-WELDING, SOLDER JOINT, GROOVED AND FLARED ENDS
    ANSI/CSA-B149.6-15 Code for digester gas, landfill gas, and biogas generation and utilization
    ANSI/AWWA C509:2023 Resilient-Seated Gate Valves for Water Supply Service
    MSS SP 85 : 2011 GRAY IRON GLOBE & ANGLE VALVES, FLANGED AND THREADED ENDS
    ASTM F 901 : 2001 : R2007 Standard Specification for Aluminum Transmission Tower Bolts and Nuts
    SAE J 429 : 2014 MECHANICAL AND MATERIAL REQUIREMENTS FOR EXTERNALLY THREADED FASTENERS
    ASTM F 704 : 1981 : R2009 Standard Practice for Selecting Bolting Lengths for Piping System Flanged Joints
    ASTM F 1155 : 2010 Standard Practice for Selection and Application of Piping System Materials
    API 12B : 2014 SPECIFICATION FOR BOLTED TANKS FOR STORAGE OF PRODUCTION LIQUIDS
    API SPEC 12L : 2008 SPECIFICATION FOR VERTICAL AND HORIZONTAL EMULSION TREATERS
    MIL-S-11716 Revision D:1993 SUPERSTRUCTURE, STEEL, FOR BRIDGE, FLOATING, PNEUMATIC FLOAT, CLASS 60
    SAE J 2270 : 2016 SHIP SYSTEMS AND EQUIPMENT - THREADED FASTENERS - INSPECTION, TEST, AND INSTALLATION GUIDANCE
    ASTM A 1056 : 2012 Standard Specification for Cast Iron Couplings Used for Joining Hubless Cast Iron Soil Pipe and Fittings
    ASTM F 593 : 2017 : REDLINE Standard Specification for Stainless Steel Bolts, Hex Cap Screws, and Studs
    AWWA C111/A21.11 : 2017 RUBBER-GASKET JOINTS FOR DUCTILE-IRON PRESSURE PIPE AND FITTINGS
    ASTM F 2437/F2437M : 2017 : REDLINE Standard Specification for Carbon and Alloy Steel Compressible-Washer-Type Direct Tension Indicators for Use with Cap Screws, Bolts, Anchors, and Studs
    ANSI C135.1 : 1999 ZINC-COATED STEEL BOLTS AND NUTS FOR OVERHEAD LINE CONSTRUCTION
    IFI 100 107 : 2002 PREVAILING-TORQUE TYPE STEEL HEX AND HEX FLANGE NUTS REGULAR AND LIGHT HEX SERIES
    ASME B31.3:2016 PROCESS PIPING
    ASTM F 1142 : 1998 : R2003 Standard Specification for Manhole Cover Assembly Bolted, Semi-Flush, Oiltight and Watertight
    API 594 : 2017 CHECK VALVES: FLANGED, LUG, WAFER, AND BUTT-WELDING
    NBR 15827 : 2014 INDUSTRIAL VALVES FOR INSTALLATIONS OF EXPLORATION, PRODUCTION, REFINING AND TRANSPORT OF PETROL PRODUCTS - REQUIREMENTS FOR DESIGN AND PROTOTYPE TEST
    ASME B16.42 : 2016 DUCTILE IRON PIPE FLANGES AND FLANGED FITTINGS - CLASSES 150 AND 300
    MIL V 24569 : 0 VALVE, QUICK CLOSING, FOR FUEL OIL AND AUXILIARY STEAM EMERGENCY SHUTDOWN
    ASTM F 2882 : 2012 Standard Specification for Screws, Alloy Steel, Heat Treated, 170 ksi Minimum Tensile Strength
    AWWA C503 : 2014 WET-BARREL FIRE HYDRANTS
    MIL-DTL-32529 Base Document:2015 POWER ELECTRONIC CONVERSION EQUIPMENT, NAVAL SHIPBOARD
    MIL V 1189 : D VALVE, GATE, BRONZE, FLANGED ENDS, WORKING PRESSURES UP TO 400 PS [SHIPBOARD USE]
    NASA STD 8719.24 : 2011 NASA EXPENDABLE LAUNCH VEHICLE PAYLOAD SAFETY REQUIREMENTS
    ASTM A 394 : 2008 Standard Specification for Steel Transmission Tower Bolts, Zinc-Coated and Bare
    CSA/ANSI Z21.10.1:19/CSA 4.1:19 Gas water heaters, volume I, storage water heaters with input ratings of 75,000 Btu per hour or less
    ASTM A 761/A761M : 2017-02 SPECIFICATION FOR CORRUGATED STEEL STRUCTURAL PLATE, ZINC-COATED, FOR FIELD-BOLTED PIPE, PIPE-ARCHES, AND ARCHES
    AWWA C509 : 2015 RESILIENT-SEATED GATE VALVES FOR WATER SUPPLY SERVICE
    MSS SP 128 : 2012 DUCTILE IRON GATE VALVES
    ANSI/AWWA D120 : 2009 THERMOSETTING FIBERGLASS-REINFORCED PLASTIC TANKS
    MIL-PRF-13789 Revision E:1999 STRAINERS, SEDIMENT: PIPELINE, BASKET TYPE
    ASTM F 1565 : 2000 Standard Specification for Pressure-Reducing Valves for Steam Service
    ASTM F 901 : 2001 : R2017 Standard Specification for Aluminum Transmission Tower Bolts and Nuts
    AWWA C500 : 2019 Metal-Seated Gate Valves for Water Supply Service
    ACI 350 : 2006 CODE REQUIREMENTS FOR ENVIRONMENTAL ENGINEERING CONCRETE STRUCTURES AND COMMENTARY
    CSA O86 : 2014 ENGINEERING DESIGN IN WOOD
    ACI 349M : 2013 CODE REQUIREMENTS FOR NUCLEAR SAFETY-RELATED CONCRETE STRUCTURES AND COMMENTARY
    NEMA CC1 : 2009(R2015) ELECTRIC POWER CONNECTORS FOR SUBSTATIONS
    ASTM F 704 : 1981 : R1996 : EDT 1 Standard Practice for Selecting Bolting Lengths for Piping System Flanged Joints
    ANSI Z83.11 : 2016 GAS FOOD SERVICE EQUIPMENT
    MIL-DTL-1189 Revision E:2018 VALVE, GATE, BRONZE
    ASTM F 1143 : 1998 : R2012 Standard Specification for Manhole Cover Assembly, Bolted, Raised, Oiltight and Watertight
    MSS SP 70 : 2011 GRAY IRON GATE VALVES, FLANGED AND THREADED ENDS
    MIL S 1222 : H STUD, BOLTS, HEX CAP SCREWS, SOCKET HEAD CAP SCREWS AND NUTS
    ASTM B 746/B746M : 2016 : REDLINE Standard Specification for Corrugated Aluminum Alloy Structural Plate for Field-Bolted Pipe, Pipe-Arches, and Arches
    ASTM F 1565 : 2000 : R2019 Standard Specification for Pressure-Reducing Valves for Steam Service
    API 594 REDLINE : 2010 CHECK VALVES: FLANGED, LUG, WAFER, AND BUTT-WELDING
    FF-B-561 Revision D:1989 BOLT, (SCREW), LAG
    DIN EN 61518:2002-06 MATING DIMENSIONS BETWEEN DIFFERENTIAL PRESSURE (TYPE) MEASURING INSTRUMENTS AND FLANGED-ON SHUT-OFF DEVICES UP TO 413 BAR (41,3 MPA)
    MIL-PRF-32152 Base Document:2005 CLOSURE, HVAC, BUTTERFLY TYPE, SHIPBOARD SERVICE
    ASTM F 1565 : 2000 : R2013 Standard Specification for Pressure-Reducing Valves for Steam Service
    ASTM F 1143 : 1998 Standard Specification for Manhole Cover Assembly, Bolted, Raised, Oiltight and Watertight
    ACI 349 : 2013 CODE REQUIREMENTS FOR NUCLEAR SAFETY-RELATED CONCRETE STRUCTURES AND COMMENTARY
    MSS SP 78 : 2011 GRAY IRON PLUG VALVES, FLANGED AND THREADED ENDS
    AWWA C515 : 2015 REDUCED-WALL, RESILIENT-SEATED GATE VALVES FOR WATER SUPPLY SERVICE
    CSA NGV 5.1 : 2016 RESIDENTIAL FUELING APPLIANCES
    GGG-D-2782 Base Document:1991 DRIVE, POWER, PORTABLE; FOR PIPE AND BOLT THREADING, ELECTRIC (WITH ACCESSORIES)
    ASTM D 6256/D6256M : 2016 : REDLINE Standard Specification for Wood-Cleated Shipping Boxes with Skidded, Load-Bearing Bases
    MIL V 24509 : A VALVES, FLANGED, BALL & PLUG FOR SEWAGE & SEA WATER SERVICE
    MSS SP 136 : 2014 DUCTILE IRON SWING CHECK VALVES
    ASTM A 394 : 2008 : R2015 Standard Specification for Steel Transmission Tower Bolts, Zinc-Coated and Bare
    AWWA C502 : 2014 DRY-BARREL FIRE HYDRANTS
    ANSI Z21.10.3 : 2015 GAS-FIRED WATER HEATERS, VOLUME 3, STORAGE WATER HEATERS WITH INPUT RATINGS ABOVE 75,000 BTU PER HOUR, CIRCULATING AND INSTANTANEOUS
    ASME B31.5 : 2016 REFRIGERATION PIPING AND HEAT TRANSFER COMPONENTS
    ASME B18.13 : 2017 SCREW AND WASHER ASSEMBLIES - SEMS (INCH SERIES)
    ASME B16.15 : 2013 CAST COPPER ALLOY THREADED FITTINGS: CLASSES 125 AND 250
    ASTM F 704 : 1981 : R2014 Standard Practice for Selecting Bolting Lengths for Piping System Flanged Joints
    ASTM D 6880/D6880M : 2011 : REDLINE Standard Specification for Wood Boxes
    MIL-DTL-14522 Revision E:2010 COMPONENTS, PREFABRICATED STRONG ROOM, PORTABLE: FOR SMALL ARMS AND EQUIPMENT
    ASTM F 1142 : 1998 : R2012 Standard Specification for Manhole Cover Assembly, Bolted, Semi-Flush, Oiltight and Watertight
    ANSI Z21.10.1 : 2017 GAS WATER HEATERS, VOLUME 1, STORAGE WATER HEATERS WITH INPUT RATINGS OF 75,000 BTU PER HOUR OR LESS
    ASTM F 1155 : 2010 : R2015 Standard Practice for Selection and Application of Piping System Materials
    MSS SP 106 : 2012 CAST COPPER ALLOY FLANGES AND FLANGED FITTINGS: CLASS 125, 150, AND 300
    ASTM F 1143 : 1998 : R2003 Standard Specification for Manhole Cover Assembly, Bolted, Raised, Oiltight and Watertight
    ANSI Z21.74-2017 Portable refrigerators
    ASTM A 394 : 2008 : EDT 1 Standard Specification for Steel Transmission Tower Bolts, Zinc-Coated and Bare
    ASTM D 7478/D7478M : 2011 Standard Specification for Heavy Duty Sheathed Wood Crates
    MIL-B-16115 Revision G:1991 BUOYS, MOORING, AND MARKER
    API 12F : 2008 SPECIFICATION FOR SHOP WELDED TANKS FOR STORAGE OF PRODUCTION LIQUIDS
    MIL-DTL-1222 Revision J:2000 STUDS, BOLTS, SCREWS AND NUTS FOR APPLICATIONS WHERE A HIGH DEGREE OF RELIABILITY IS REQUIRED; GENERAL SPECIFICATION FOR
    MIL STD 11991 : A GENERAL STANDARD FOR PARTS, MATERIALS, AND PROCESSES
    MIL-T-53066 Revision B:1994 TANK, FABRIC, COLLAPSIBLE, 5000 BARREL, FUEL
    ASTM F 1144 : 1998 : R2003 Standard Specification for Manhole Cover Assembly, Bolted, Semi-Flush, Oiltight and Watertight, Hinged
    ANSI/CSA NGV 5.1-2016 (R2020) Residential fueling appliances
    MIL N 45913 : B NUTS, SELF LOCKING, HEXAGON, PREVAILING-TORQUE
    ASTM F 2281 : 2004 Standard Specification for Stainless Steel and Nickel Alloy Bolts, Hex Cap Screws, and Studs, for Heat Resistance and High Temperature Applications
    ANSI Z21.89-2017/CSA 1.18-2017 Outdoor cooking specialty gas appliances
    ASME B16.34 : 2017 VALVES - FLANGED, THREADED, AND WELDING END
    MIL-DTL-24509 Revision B:2017 Valves, Flanged, Balland Plugfor Sewageand Seawater Service
    MIL-HDBK-454 Revision B:2007 GENERAL GUIDELINES FOR ELECTRONIC EQUIPMENT
    ASTM A 1056 : 2012 : R2017 Standard Specification for Cast Iron Couplings Used for Joining Hubless Cast Iron Soil Pipe and Fittings
    ASHRAE 26 : 2010 MECHANICAL REFRIGERATION AND AIR-CONDITIONING INSTALLATIONS ABOARD SHIP
    AASHTO M 167M/M 167 : 2014 SPECIFICATION FOR CORRUGATED STEEL STRUCTURAL PLATE, ZINC-COATED, FOR FIELD-BOLTED PIPE, PIPE-ARCHES, AND ARCHES
    ASTM F 901 : 2001 : R2012 Standard Specification for Aluminum Transmission Tower Bolts and Nuts
    BS EN 61518:2001 Mating dimensions between differential pressure (type) measuring instruments and flanged-on shut-off devices up to 413 bar (41,3 MPa)
    ACI 351.2R : 2010 REPORT ON FOUNDATIONS FOR STATIC EQUIPMENT
    ASME B31.12 : 2014 HYDROGEN PIPING AND PIPELINES
    ASTM F 1144 : 1998 : R2007 Standard Specification for Manhole Cover Assembly, Bolted, Semi-Flush, Oiltight and Watertight, Hinged
    ASTM D 6255/D6255M : 2005 : R2011 Standard Specification for Steel or Aluminum Slotted Angle Crates
    ASTM A 193/A193M : 2017 : REDLINE Standard Specification for Alloy-Steel and Stainless Steel Bolting for High Temperature or High Pressure Service and Other Special Purpose Applications
    MIL-PRF-13803 Revision F:1996 VALVE, GATE - DOUBLE-DISK, CAST-IRON OR STEEL
    ASTM F 704 : 1981 : R2001 Standard Practice for Selecting Bolting Lengths for Piping System Flanged Joints
    ASTM F 1142 : 1998 : R2007 Standard Specification for Manhole Cover Assembly, Bolted, Semi-Flush, Oiltight and Watertight
    ASME B31.3 SPANISH : 2010 PROCESS PIPING
    ASTM F 1565 : 2000 : R2006 Standard Specification for Pressure-Reducing Valves for Steam Service
    ASTM F 1554 : 2018 : REDLINE Standard Specification for Anchor Bolts, Steel, 36, 55, and 105-ksi Yield Strength
    EN 61518:2001/corrigendum:2002 MATING DIMENSIONS BETWEEN DIFFERENTIAL PRESSURE (TYPE) MEASURING INSTRUMENTS AND FLANGED-ON SHUT-OFF DEVICES UP TO 413 BAR (41,3 MPA)
    ASTM F 2281 : 2004 : R2017 Standard Specification for Stainless Steel and Nickel Alloy Bolts, Hex Cap Screws, and Studs, for Heat Resistance and High Temperature Applications
    IEC 61518:2001 Mating dimensions between differential pressure (type) measuring instruments and flanged-on shut-off devices up to 413 BAR (41,3 MPa)
    A-A-52415 Revision A:2010 CLAMP ASSEMBLY - EXHAUST MUFFLER AND TAILPIPE
    CSA/ANSI NGV 5.2-2017 Vehicle fueling appliances (VFA)
    MIL-DTL-45913 Revision D:2011 NUTS, SELF-LOCKING, HEXAGON, PREVAILING TORQUE
    ASTM D 6255/D6255M:2005 Standard Specification for Steel or Aluminum Slotted Angle Crates
    ASTM F 1369 : 1993 : REV A Standard Specification for Heaters, Convection, Steam and Hot Water (Withdrawn 2002)
    AWWA C207 : 2013 STEEL PIPE FLANGES FOR WATERWORKS SERVICE, SIZES 4 IN. THROUGH 144 IN. (100 MM THROUGH 3,600 MM)
    A-A-52547 Base Document:1996 HOSE AND ASSEMBLIES, RUBBER: FUEL AND OIL
    FF-S-85 Revision D:2005 Screw, Cap, Slotted and Hexagon Head
    ASTM F 2281 : 2004 : R2012 Standard Specification for Stainless Steel and Nickel Alloy Bolts, Hex Cap Screws, and Studs, for Heat Resistance and High Temperature Applications
    ASTM F 1142:1998 Standard Specification for Manhole Cover Assembly Bolted, Semi-Flush, Oiltight and Watertight
    ANSI Z21.10.3-2017/CSA 4.3:2017 GAS-FIRED WATER HEATERS, VOLUME 3, STORAGE WATER HEATERS WITH INPUT RATINGS ABOVE 75,000 BTU PER HOUR, CIRCULATING AND INSTANTANEOUS
    MSS SP 71 : 2011 GRAY IRON SWING CHECK VALVES, FLANGED AND THREADED ENDS
    AWWA C230 : 2016 STAINLESS-STEEL FULL-ENCIRCLEMENT REPAIR AND SERVICE CONNECTION CLAMPS FOR 2-IN. THROUGH 12-IN. (50-MM THROUGH 300-MM) PIPE
    ASTM F 1144 : 1998 : R2012 Standard Specification for Manhole Cover Assembly, Bolted, Semi-Flush, Oiltight and Watertight, Hinged
    ACI 350M : 2006 METRIC CODE REQUIREMENTS FOR ENVIRONMENTAL ENGINEERING CONCRETE STRUCTURES AND COMMENTARY
    MIL-F-19700 Revision A:1987 FASTENERS, SCREW THREADED, AND RELATED ITEMS, NON-MAGNETIC
    MSS SP 114 : 2007 CORROSION RESISTANT PIPE FITTINGS THREADED AND SOCKET WELDING CLASS 150 AND 1000
    IEEE C135.80-2012 IEEE Standard for Fasteners for Overhead Line Construction
    ASTM D 7478/D7478M : 2011 : R2017 Standard Specification for Heavy Duty Sheathed Wood Crates
    NBR 14243 : 1998 JUNTAS DE FERRO FUNDIDO DUCTIL TIPO "GIBAULT" - REQUISITOS
    ASTM F 2882/F2882M : 2017 : REDLINE Standard Specification for Screws, Alloy Steel, Heat Treated, 170 ksi and 1170 MPa Minimum Tensile Strength (Inch and Metric)

    Standards Referencing This Book - (Show below) - (Hide below)

    MIL F 18240 : E FASTENER ELEMENT, SELF-LOCKING, THREADED FASTENER, 250 DEG F MAXIMUM
    ASME Y14.5 : 2009 DIMENSIONING AND TOLERANCING
    ASTM F 593 : 2017 : REDLINE Standard Specification for Stainless Steel Bolts, Hex Cap Screws, and Studs
    SAE J 429 : 2014 MECHANICAL AND MATERIAL REQUIREMENTS FOR EXTERNALLY THREADED FASTENERS
    ASME B94.11M : 1993 TWIST DRILLS
    ASTM A 449 : 2014 : REDLINE Standard Specification for Hex Cap Screws, Bolts and Studs, Steel, Heat Treated, 120/105/90 ksi Minimum Tensile Strength, General Use
    ASME B18.24 : 2015 PART IDENTIFYING NUMBER (PIN) CODE SYSTEM STANDARD FOR B18 FASTENER PRODUCTS
    MS15981 Revision D:1967 FASTENER, EXTERNALLY THREADED, SELF LOCKING DESIGN AND USAGE LIMITATIONS FOR
    ASME B18.18 : 2017 QUALITY ASSURANCE FOR FASTENERS
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