ISO/TC 20/SC 4 - Aerospace fastener systems

This document specifies basic dimensions, characteristics and engineering requirements for TORX® PARALOBE® recesses in aerospace fasteners.

This document specifies basic dimensions, characteristics and engineering requirements for TORX® PARALOBE® driver bits used with aerospace fasteners.

This document describes torque and preload test method for threaded collars. This test method is used to measure the locking torque, breakaway torque, torque off and preload of threaded collars.

This document describes the locking torque test method for blind fasteners, threaded type. This test method is used to measure the locking torque of blind fasteners with internal thread and external sleeve. It is applicable to blind fasteners consisting out of four elements (drive nut, nut, sleeve and corebolt) having a cross recess at the top of the nut.

This document specifies the dimensions of normal bihexagonal head bolts, with close or large tolerance normal shank and short or medium length MJ threads, in metallic material, coated or uncoated, with strength classes less than or equal to 1 100 MPa. This document is applicable to the compilation of aerospace product standards.

The following documents are referred to in the text in such a way that some or all of their content constitutes requirements of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. ISO 7500‑1, Metallic materials — Calibration and verification of static uniaxial testing machines — Part 1: Tension/compression testing machines — Calibration and verification of the force-measuring system

This document specifies the lead and runout thread and undercut requirements for internal threads (blind tapped holes) for aerospace construction. It is applicable whenever it is referenced in a definition document.

This document specifies the lead and runout requirements for rolled external threads for aerospace construction, and the inspection method to be used in case of dispute. It is applicable whenever it is referenced in a definition document.

This document defines the tolerances of form and position of metric nuts meant for aerospace construction. These tolerances comply with ISO 1101, ISO 2692 and ISO 5459.

ISO 15872:2017 provides methods for the gauging of ISO UNJ threads complying with ISO 3161. Other methods of ensuring that the product is within the specified limits can be used, provided that correlation with the specified gauges is established.

ISO 8168:2016 the characteristics and quality assurance requirements for MJ thread bolts made of heat and corrosion resisting steel, of strength class 1 100 MPa, for aerospace construction. It is applicable whenever it is referenced in a definition document.

ISO 10959:2016 contains information for the gauging of ISO MJ threads in accordance with ISO 5855‑1, ISO 5855‑2, and ISO 5855‑3. Other methods of ensuring that the product is within the specified limits may be used provided correlation with the specified gauges is established [see 8.2, e)].

ISO 9609:2016 specifies the dimensions of plain, hexagonal nuts, reduced height, normal across flats, with MJ threads, of classifications: 450 MPa/120 °C, 450 MPa/235 °C, 600 MPa/425 °C, 900 MPa/235 °C, 900 MPa/315 °C, 900 MPa/650 °C, 1 100 MPa/235 °C, 1 100 MPa/730 °C, and 1 250 MPa/600 °C. NOTE 1 450 MPa, 600 MPa, 900 MPa, 1 100 MPa and 1 250 MPa corresponds to the minimum tensile stress which the nut is able to withstand at ambient temperature without breaking or cracking when tested with a bolt of a higher strength class. NOTE 2 120 °C, 235 °C, 425 °C, 315 °C, 650 °C, 730 °C and 600 °C corresponds to the maximum temperature that the nut is able to withstand without permanent alteration to its original characteristics, after ambient temperature has been restored. The maximum temperature is conditioned by the surface treatment. Nuts provided with holes are intended to be used with lockwire in conformity with ISO 245. ISO 9609:2016 is only applicable for the compilation of aerospace product standards.

ISO 3209:2016 specifies the dimensions of self-locking, floating, two lug anchor nuts, with counterbore, with MJ threads, of classifications: 1 100 MPa/235 °C, 1 100 MPa/315 °C and 1 100 MPa/425 °C. It is only applicable for the compilation of aerospace product standards.

ISO 9618:2016 specifies the dimensions of hexagon slotted (castellated) nuts, reduced height, normal across flats, with MJ threads, of classifications: 450 MPa/120 °C, 450 MPa/235 °C, 600 MPa/425 °C, 900 MPa/235 °C, 900 MPa/315 °C, 900 MPa/650 °C, 1 100 MPa/235 °C, 1 100 MPa/730 °C, and 1 250 MPa/600 °C. These nuts are intended to be used with split pins in conformity with ISO 1234. ISO 9618:2016 is applicable for the compilation of aerospace product standards.

ISO 9154.2016 specifies the characteristics and quality assurance requirements for MJ threads bolts made of heat-resisting nickel-base alloy, of strength class 1 550 MPa, for aerospace construction. It is applicable whenever it is referenced in a definition document.

ISO 12260:2016 specifies the dimensions of pan head screws with internal offset cruciform ribbed or unribbed drive, stepped shank, short or medium length MJ threads, in metallic material, coated or uncoated, with strength classes less than or equal to 1 100 MPa. It is applicable to the compilation of aerospace product standards.

ISO 12289:2016 specifies the characteristics and quality assurance requirements for solid rivets made in corrosion-resisting steel for aerospace construction. It is applicable whenever it is referenced in a definition document.

ISO 12261:2016 specifies the dimensions of pan head screws with internal offset cruciform ribbed or unribbed drive, pitch diameter shank and long length MJ threads, in metallic material, coated or uncoated, with strength classes less than or equal to 1 100 MPa. ISO 12261:2016 is applicable to the compilation of aerospace product standards.

ISO 16130:2015 applies to the dynamic testing of the locking behaviour of bolted connections in order to investigate the self-loosening behaviour of fasteners for aerospace applications and is mainly intended for development work. As test apparatuses are different (e.g. stiffness distribution), testing in accordance with this International Standard, therefore, does not allow an absolute statement to be made on the locking behaviour of bolted assemblies under service loads. Thus, the objective of this test is a comparative evaluation of locking elements under defined test conditions.

ISO 12273:2010 specifies the dimensions of floating, self-aligning, two lug anchor nuts, with MJ threads and a self-locking feature achieved by forming the upper portion out-of-round, of the following classifications: 900 MPa/235 °C; 900 MPa/315 °C; 900 MPa/425 °C. ISO 12273:2010 is only applicable for the compilation of aerospace product standards.

ISO 7689:2008 specifies the characteristics and quality assurance requirements for MJ thread bolts made of alloy steel, of strength class 1 100 MPa, for aerospace construction. It is applicable whenever it is referenced in a definition document.

ISO 8641:2008 specifies the required characteristics for metric self-locking nuts, with MJ thread, for use in aerospace construction at a maximum temperature greater than 425 °C. ISO 8641:2008 is applicable to nuts as defined above, provided that reference is made to this International Standard in the relevant definition document.

ISO 8642:2008 specifies test methods for metric self-locking nuts with MJ threads intended for use in aerospace construction at maximum operating temperature greater than 425 °C. It describes the test device and the method for each test. ISO 8642:2008 applies to self-locking nuts as defined above, provided that the relevant documents (dimensional standard, drawing, procurement specification, etc.) refer to this International Standard. Other test devices or test methods than those specified in ISO 8642:2008 may be used, but, in the event of a dispute, the requirements laid down in this International Standard shall take precedence. ISO 8642:2008 shall be used in conjunction with ISO 8641.

ISO 5856:2008 specifies the dimensions of 100° normal countersunk head screws with internal offset cruciform ribbed or unribbed drive, with close or large tolerance normal shank and short or medium length MJ threads, in metallic material, coated or uncoated, with strength classes less than or equal to 1 100 MPa. ISO 5856:2008 is applicable to the compilation of aerospace product standards.

ISO 3186:2008 specifies the dimensions of large bihexagonal head bolts, with close or large tolerance normal shank and short or medium length MJ threads, in metallic material, coated or uncoated, with strength classes 1 250 MPa to 1 800 MPa. ISO 3186:2008 is applicable to the compilation of aerospace product standards.

ISO 3193:2008 specifies the dimensions of normal hexagonal head bolts, with close or large tolerance normal shank and short or medium length MJ threads, in metallic material, coated or uncoated, with strength classes less than or equal to 1 100 MPa. ISO 3193:2008 is applicable to the compilation of aerospace product standards.

ISO 13921:2008 specifies the dimensions of 100° reduced countersunk head screws with internal offset cruciform ribbed or unribbed drive, with close or large tolerance normal shank and short or medium length MJ threads, in metallic material, coated or uncoated, with strength classes less than or equal to 1 100 MPa. ISO 13921:2008 is applicable to the compilation of aerospace product standards.

ISO 5857:2008 specifies the characteristics and quality assurance requirements for MJ threads bolts made of alloy steel, of strength class 1 250 MPa, for aerospace construction. ISO 5857:2008 is applicable whenever it is referenced in a definition document.

ISO 12257:2008 specifies the dimensions of metric internal six-lobe drives used in metric screws in nominal thread diameter range 3 mm to 20 mm.

ISO 8279:2008 specifies the dimensions of plain, hexagonal nuts, of normal height, normal across flats, with MJ threads, of classifications: 600 MPa/120 °C, 600 MPa/235 °C, 900 MPa/425 °C, 1 100 MPa/235 °C, 1 100 MPa/315 °C, 1 100 MPa/650 °C, 1 210 MPa/730 °C, 1 250 MPa/235 °C and 1 550 MPa/600 °C. Nuts provided with holes are intended to be used with lockwire in conformity with ISO 245. ISO 8279:2008 is only applicable for the compilation of aerospace product standards.

ISO 9157:2002 specifies the dimensions of spline-drive nuts, with MJ threads and a self-locking feature achieved by forming the upper portion out-of-round, for classifications: 1 100 MPa/425 °C, 1 100 MPa/650 °C, 1 210 MPa/425 °C, 1 210 MPa/730 °C, 1 550 MPa/235 °C, 1 550 MPa/ 425 °C and 1 550 MPa/600 °C. ISO 9157:2002 is only applicable for the compilation of aerospace product standards.

ISO 12256:2002 specifies the dimensions of metric internal cruciform ribbed drives used in metric screws in the nominal thread diameter range of 3 mm to 20 mm.

ISO 8940:2002 specifies the dimensions of self-locking, sealing, floating, two-lug anchor nuts, with counterbore, with MJ threads, for classifications: 900 MPa/120 °C, 900 MPa/175 °C and 900 MPa/235 °C. ISO 8940:2002 is only applicable for the compilation of aerospace product standards.

ISO 7995:2002 specifies the dimensions of hexagonal nuts, with MJ threads and a self-locking feature achieved by forming the upper portion out-of-round, for classifications: 1 100 MPa/235 °C, 1 100 MPa/315 °C, 1 100 MPa/425 °C. ISO 7995:2002 is only applicable for the compilation of aerospace product standards.

ISO 14278 specifies the dimensions of metric gauges which check internal offset cruciform drives, ribbed or unribbed, used in metric screws in the nominal thread diameter range of 1,6 mm to 20 mm.

ISO 14280 specifies the dimensions of metric ribbed drivers which are inserted into internal cruciform ribbed or unribbed drives used in metric screws in the nominal thread diameter range of 1,6 mm to 20 mm.

ISO 14279 specifies the dimensions of metric internal cruciform drives used in metric screws in the nominal thread diameter range of 1,6 mm to 20 mm.

ISO 14281 specifies the dimensions of metric gauges which check internal cruciform drives, ribbed or unribbed, used in metric screws in the nominal thread diameter range of 1,6 mm to 20 mm.

ISO 14277 specifies the dimensions of metric ribbed drivers which are inserted into internal offset cruciform ribbed or unribbed drives used in metric screws in the nominal thread diameter range of 1,6 mm to 20 mm.

ISO 14275 specifies the dimensions of metric internal, offset cruciform, ribbed drives used in metric screws in the nominal thread diameter range of 3 mm to 20 mm.

ISO 14276 specifies the dimensions of metric internal, offset cruciform drives used in metric screws in the nominal thread diameter range of 1,6 mm to 20 mm.

This International Standard specifies the dimensions of standard series gang channels with self-locking, floating nuts, with counterbore, with MJ threads, of classifications: This International Standard is only applicable to the compilation of aerospace product standards.

This International Standard specifies the marks allowed to identify material and metric series on solid rivets for use in aerospace construction. It applies when reference is made to this International Standard in the product standard or definition document.

This International Standard specifies the characteristics and quality assurance requirements for solid rivets made in nickel alloy for aerospace construction. It is applicable whenever it is referenced in a definition document.

This International Standard specifies the dimensions of closed inserts, with self-locking MJ threads, in metallic material, coated or uncoated, for honeycomb and composite materials. The classification referring to strength and temperature, depending on the core material and potting compound, is not specified. This International Standard is only applicable to the compilation of aerospace product standards.

This International Standard specifies the dimensions of open inserts, with self-locking MJ threads, in metallic material, coated or uncoated, for honeycomb and composite materials. The classification referring to strength and temperature, depending on the core material and potting compound, is not specified. This International Standard is only applicable to the compilation of aerospace product standards.

This International Standard specifies the dimensions of inserts, with self-locking floating nut, with MJ threads, in metallic material, coated or uncoated, for honeycomb and composite materials. The classification referring to strength and temperature, depending on the core material and potting compound, is not specified. This International Standard is only applicable to the compilation of aerospace product standards.

This International Standard specifies the characteristics and quality assurance requirements for solid rivets made in titanium or titanium alloy for aerospace construction. It is applicable whenever it is referenced in a definition document.

This International Standard specifies the dimensions of inserts with clearance hole, in metallic material, coated or uncoated, for honeycomb and composite materials. The classification referring to strength and temperature, depending on the core material and potting compound, is not specified. This International Standard is only applicable to the compilation of aerospace product standards.