BS ISO 3209-2016 pdf download.Aerospace 一Nuts, anchor , self-locking, floating, two lug, with counterbore, with MJ threads, classifications: 1 100 MPa (at ambient temperature)/235 °C, 1 100 MPa (at ambient temperature)/315。C and 1 100 MPa (at ambient temperature)/425。C一 Dimensions.
This International Standard 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
1100 MPa/425 °C.
NOTE 1 1100 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 2 235 °C. 315 °C and 425 °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.
This International Standard is only applicable for the compilation of aerospace product standards.
2 Normative references
The following documents, in whole or in part, are normatively referenced in this document and are indispensable for its application. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
ISO 585 5-2, Aerospace MI threads — Part 2: Limit dimensions for bolts and nuts
ISO 5858, Aerospace — Nuts, self-locking, with maximum operating temperature less than or equal to 425 °C — Procurement specification
ISO 8788, Aerospace — Nuts, metric — Tolerances ofform and position
3 Configuration and dimensions
See Figure 1 and Table 1. Dimensions and tolerances are expressed in millimetres. They apply after any surface coating(s) but before the application of any lubricant.
The metallic cap (optional) shall remain joined to the nut at the maximum operating temperature (type of attachment at the user’s discretion). See ISO 5858 for the test conditions.
Tolerances of form and position shall conform to those specified in ISO 8788. Details of form not stated are at the manufacturer’s discretion.BS ISO 3209 pdf download.