ANSI Webstore

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

Useful Links

CUSTOMER SERVICE

Our Contacts

ANSI HEADQUARTERS
Washington, DC
1899 L Street, NW, 11th Floor
Washington, DC 20036

Tel: 202.293.8020
Fax: 202.293.9287

NEW YORK OFFICE
New York, NY
25 West 43rd Street, 4th floor
New York, NY 10036

Tel: 212. 642.4900
Fax: 212.398.0023