ISO 4580:2021 pdf download – Aerospace – Drives, internal, TORXR PARALOBER driver bit- Geometrical definition, gaging and technical requirements.
1 Scope This document specifies basic dimensions, characteristics and engineering requirements for TORX ® PARALOBE ® 1) driver bits used with aerospace fasteners. 2 Normative references 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 4579, Aerospace — Drives, internal, TORX® PARALOBE® drive — Geometrical definition, gaging and technical requirements 3 Terms and definitions For the purposes of this document, the following terms and definitions apply. ISO and IEC maintain terminology databases for use in standardization at the following addresses: — ISO Online browsing platform: available at https:// www .org/ obp — IEC Electropedia: available at http:// www .electropedia .org/ 3.1 driver bit tool to induce a torque into a fastener’s recess (3.2) 3.2 recess geometry in a fastener that allows attaching a tool in order to induce a torque to enable tightening and untightening of a fastener 4 Basic driver bit configuration 4.1 General The basic driver bit configuration shall be in accordance with Figure 1. Driver bits according to this document shall be used in conjunction with fasteners having an internal TORX ® PARALOBE ® drive according to ISO 4579.
The driver bit inspection gage identification markings shall appear on surface of gage along with drive size descriptor and gage series number. EXAMPLE: 25SI TORX ® PARALOBE ® Driver bit gage 25-SDI-722 5.2 Driver bit gaging procedure The driver bit configuration dimensions shall be inspected with the go, no-go gages specified in Figure 2. The driver bit body dimensions shall be appropriate for the application as defined in the applicable military standards, industry standards or manufacturer’s data. Unless otherwise specified, the driver bit shall be in accordance with the requirements of industry standards. Driver bit inspection gage dimensions are listed in Tables 3 and 4. The driver bit configuration length (L) shall be measured with a calliper or other appropriate method.