Customer Service:
Mon - Fri: 8:30 am - 6 pm EST

Hex Nut Standards

These standards from ANSI, ASME, ISO, SAE, and others address the materials, construction, and requirements for hex nuts for a variety of applications.

 Basic Hex Nuts
 Thin (Jam, Reduced Height) Hex Nuts
 High Hex Nuts
 Prevailing Torque Type Hex Nuts
 Slotted (Castellated) Hex Nuts
 Hex Nuts with Flange
 Self-Locking Hex Nuts
 Other Hex Nuts

Basic Hex Nuts

ANSI/ASME B18.2.4.1M-2002

Hex Nuts, Style 1, Metric

ANSI/ASME B18.2.4.2M-2005

Metric Hex Nuts, Style 2

ASME B18.2.4.6M-2010

Metric Heavy Hex Nuts

ISO 4032:2012

Hexagon regular nuts (style 1) - Product grades A and B

ISO 4034:2012

Hexagon regular nuts (style 1) - Product grade C

ISO 8673:2012

Hexagon regular nuts (style 1) with metric fine pitch thread - Product grades A and B

ISO 8279:2008

Aerospace - Nuts, hexagonal, plain, normal height, normal across flats, with MJ threads, classifications: 600 MPa (at ambient temperature)/120 degrees C, 600 MPa (at ambient temperature)/235 degrees C, 900 MPa (at ambient temperature)/425 degrees C, 1 100 MPa (at ambient temperature)/235 degrees C, 1 100 MPa (at ambient temperature)/315 degrees C, 1 100 MPa (at ambient temperature)/650 degrees C, 1 210 MPa (at ambient temperature)/730 degrees C, 1 250 MPa (at ambient temperature)/235 degrees C and 1 550 MPa (at ambient temperature)/600 degrees C - Dimensions

Thin (Jam, Reduced Height) Hex Nuts

ASME B18.2.4.5M-2008

Metric Hex Jam Nuts

SAE J 483-2016

High and Low Crown (Blind, Acorn) Hex Nuts

ISO 10511:2012

Prevailing torque type hexagon thin nuts (with non-metallic insert)

ISO 4035:2012

Hexagon thin nuts chamfered (style 0) - Product grades A and B

ISO 4036:2012

Hexagon thin nuts unchamfered (style 0) - Product grade B

ISO 8675:2012

Hexagon thin nuts chamfered (style 0) with metric fine pitch thread - Product grades A and B

ISO 10096:1997

Aerospace - Nuts, hexagonal, slotted (castellated), reduced height, reduced across flats, with MJ threads, classifications: 450 MPa (at ambient temperature)/425 degrees C, 600 MPa (at ambient temperature)/235 degrees C, 600 MPa (at ambient temperature)/315 degrees C, 600 MPa (at ambient temperature)/650 degrees C, 900 MPa (at ambient temperature)/235 degrees C, 900 MPa (at ambient temperature)/730 degrees C and 1 100 MPa (at ambient temperature)/600 degrees C - Dimensions

ISO 9618:2016

Aerospace - Nuts, hexagonal, slotted (castellated), reduced height, normal across flats, with MJ threads, classifications: 450 MPa (at ambient temperature)/120 degrees C, 450 MPa (at ambient temperature)/235 degrees C, 600 MPa (at ambient temperature)/425 degrees C, 900 MPa (at ambient temperature)/235 degrees C, 900 MPa (at ambient temperature)/315 degrees C, 900 MPa (at ambient temperature)/650 degrees C, 1 100 MPa (at ambient temperature)/235 degrees C, 1 100 MPa (at ambient temperature)/730 degrees C and 1 250 MPa (at ambient temperature)/600 degrees C - Dimensions

ISO 12268:1997

Aerospace - Nuts, hexagonal, plain, reduced height, reduced across flats, with MJ threads, classifications: 450 MPa (at ambient temperature)/425 degrees C, 600 MPa (at ambient temperature)/235 degrees C, 600 MPa (at ambient temperature)/315 degrees C, 600 MPa (at ambient temperature)/650 degrees C, 900 MPa (at ambient temperature)/235 degrees C, 900 MPa (at ambient temperature)/730 degrees C and 1 100 MPa (at ambient temperature)/600 degrees C - Dimensions

ISO 9609:2016

Aerospace - Nuts, hexagonal, plain, reduced height, normal across flats, with MJ threads, classifications: 450 MPa (at ambient temperature) /120 degrees C, 450 MPa (at ambient temperature) /235 degrees C, 600 MPa (at ambient temperature) /425 degrees C, 900 MPa (at ambient temperature) /235 degrees C, 900 MPa (at ambient temperature) /315 degrees C, 900 MPa (at ambient temperature) /650 degrees C, 1 100 MPa (at ambient temperature) /235 degrees C, 1 100 MPa (at ambient temperature) /730 degrees C and 1 250 MPa (at ambient temperature)/600 degrees C - Dimensions

High Hex Nuts

SAE J 482-2016

Hexagon High Nuts

SAE J 483-2016

High and Low Crown (Blind, Acorn) Hex Nuts

ISO 4033:2012

Hexagon high nuts (style 2) - Product grades A and B

ISO 8674:2012

Hexagon high nuts (style 2) with metric fine pitch thread - Product grades A and B

ISO 7042:2012

Prevailing torque type all-metal hexagon high nuts - Property classes 5, 8, 10 and 12

ISO 10513:2012

Prevailing torque type all-metal hexagon high nuts with metric fine pitch thread - Property classes 8, 10 and 12

Prevailing Torque Type Hex Nuts

IFI-101:2002

Torque-Tension Requirements for Prevailing-Torque Type Steel Hex and Hex Flange Nuts

ASME B18.16M-2004 (R2021)

Prevailing-Torque-Type Steel Metric Hex Nuts and Hex Flange Nuts (B18.16M - 2004)

IFI-545:2006

Mechanical and Performance Requirements for Prevailing-Torque Type Steel Metric Hex Nuts and Flange Nuts

IFI-100/107:2002

Prevailing-Torque Type Steel Hex and Hex Flange Nuts Regular and Light Hex Series

ISO 7719:2012

Prevailing torque type all-metal hexagon regular nuts - Property classes 5, 8 and 10

ISO 7720:2012

Prevailing torque type all-metal hexagon nuts, style 2 - Property class 9

ISO 12126:2012

Prevailing torque type all-metal hexagon nuts with flange with metric fine pitch thread, style 2 - Product grades A and B

ISO 7044:2012

Prevailing torque type all-metal hexagon nuts with flange, style 2 - Product grades A and B

ISO 10513:2012

Prevailing torque type all-metal hexagon high nuts with metric fine pitch thread - Property classes 8, 10 and 12

ISO 7042:2012

Prevailing torque type all-metal hexagon high nuts - Property classes 5, 8, 10 and 12

ISO 10512:2012

Prevailing torque type hexagon regular nuts (with non-metallic insert) with metric fine pitch thread - Property classes 6, 8 and 10

ISO 7040:2012

Prevailing torque type hexagon regular nuts (with non-metallic insert) - Property classes 5, 8 and 10

ISO 7041:2012

Prevailing torque type hexagon nuts (with non-metallic insert), style 2 - Property classes 9 and 12

ISO 7043:2012

Prevailing torque type hexagon nuts with flange (with non-metallic insert), style 2 - Product grades A and B

ISO 12125:2012

Prevailing torque type hexagon nuts with flange (with non-metallic insert) with metric fine pitch thread, style 2 - Product grades A and B

ISO 10511:2012

Prevailing torque type hexagon thin nuts (with non-metallic insert)

Slotted (Castellated) Hex Nuts

ASME B18.2.4.3M-1979 (R2017)

Metric Slotted Hex Nuts (B18.2.4.3M - 1979)

ISO 4147:1997

Aerospace - Nuts, hexagonal, slotted (castellated), normal height, normal across flats, with MJ threads, classifications: 600 MPa (at ambient temperature)/120 degrees C, 600 MPa (at ambient temperature)/235 degrees C, 900 MPa (at ambient temperature)/425 degrees C, 1 100 MPa (at ambient temperature)/235 degrees C, 1 100 MPa (at ambient temperature)/315 degrees C, 1 100 MPa (at ambient temperature)/650 degrees C, 1 210 MPa (at ambient temperature)/730 degrees C, 1 250 MPa (at ambient temperature)/235 degrees C and 1 550 MPa (at ambient temperature)/600 degrees C - Dimensions

ISO 9216:2002

Aerospace - Nuts, hexagonal, slotted (castellated), for pulleys, in alloy steel and cadmium plated or in corrosion-resistant steel and passivated - Dimensions and masses

ISO 10096:1997

Aerospace - Nuts, hexagonal, slotted (castellated), reduced height, reduced across flats, with MJ threads, classifications: 450 MPa (at ambient temperature)/425 degrees C, 600 MPa (at ambient temperature)/235 degrees C, 600 MPa (at ambient temperature)/315 degrees C, 600 MPa (at ambient temperature)/650 degrees C, 900 MPa (at ambient temperature)/235 degrees C, 900 MPa (at ambient temperature)/730 degrees C and 1 100 MPa (at ambient temperature)/600 degrees C - Dimensions

ISO 9618:2016

Aerospace - Nuts, hexagonal, slotted (castellated), reduced height, normal across flats, with MJ threads, classifications: 450 MPa (at ambient temperature)/120 degrees C, 450 MPa (at ambient temperature)/235 degrees C, 600 MPa (at ambient temperature)/425 degrees C, 900 MPa (at ambient temperature)/235 degrees C, 900 MPa (at ambient temperature)/315 degrees C, 900 MPa (at ambient temperature)/650 degrees C, 1 100 MPa (at ambient temperature)/235 degrees C, 1 100 MPa (at ambient temperature)/730 degrees C and 1 250 MPa (at ambient temperature)/600 degrees C - Dimensions

Hex Nuts with Flange

IFI-145:2002

Hex Flange Nuts and Large Hex Flange Nuts

ISO 21670:2014

Fasteners - Hexagon weld nuts with flange

ISO 10663:2012

Hexagon nuts with flange, style 2 - Fine pitch thread

ISO 4161:2012

Hexagon nuts with flange, style 2 - Coarse thread

IFI-100/107:2002

Prevailing-Torque Type Steel Hex and Hex Flange Nuts Regular and Light Hex Series

IFI-101:2002

Torque-Tension Requirements for Prevailing-Torque Type Steel Hex and Hex Flange Nuts

ASME B18.16M-2004 (R2021)

Prevailing-Torque-Type Steel Metric Hex Nuts and Hex Flange Nuts (B18.16M - 2004)

IFI-545:2006

Mechanical and Performance Requirements for Prevailing-Torque Type Steel Metric Hex Nuts and Flange Nuts

ISO 12126:2012

Prevailing torque type all-metal hexagon nuts with flange with metric fine pitch thread, style 2 - Product grades A and B

ISO 7044:2012

Prevailing torque type all-metal hexagon nuts with flange, style 2 - Product grades A and B

ISO 7043:2012

Prevailing torque type hexagon nuts with flange (with non-metallic insert), style 2 - Product grades A and B

ISO 12125:2012

Prevailing torque type hexagon nuts with flange (with non-metallic insert) with metric fine pitch thread, style 2 - Product grades A and B

Self-Locking Hex Nuts

ISO 7995:2002

Aerospace - Nuts, hexagonal, self-locking, with MJ threads, classifications: 1 100 MPa (at ambient temperature)/235 degrees C, 1 100 MPa (at ambient temperature)/315 degrees C and 1 100 MPa (at ambient temperature)/425 degrees C - Dimensions

ISO 8538:1999

Aerospace - Nuts, hexagonal, self-locking, with counterbore and captive washer, with MJ threads, classifications: 1 100 MPa (at ambient temperature)/235 degrees C, 1 100 MPa (at ambient temperature)/315 degrees C and 1 100 MPa (at ambient temperature)/425 degrees C - Dimensions

Other Hex Nuts

IFI-128:2000

Hex Coupling Nuts

SAE ARP 1942A-2003 (SAE ARP1942A-2003)

Across Hex Corner Dimensions for Fluid Fittings and Nuts ( Reaffirmed: Jul 2007 )

SAE MA 1937A-2018

Nut, Hex, Free Running, Procurement Specification For, Metric

ANSI Logo

As the voice of the U.S. standards and conformity assessment system, the American National Standards Institute (ANSI) empowers its members and constituents to strengthen the U.S. marketplace position in the global economy while helping to assure the safety and health of consumers and the protection of the environment.

Useful Links
CUSTOMER SERVICE
NEW YORK OFFICE
ANSI HEADQUARTERS
2024 © American National Standards Institute (ANSI) All Rights Reserved.