Overview
ISO 14277:2002 specifies the dimensions of metric ribbed drivers intended for insertion into internal offset cruciform ribbed or unribbed drives used in metric screws with nominal thread diameters from 1.6 mm to 20 mm. The standard focuses on dimensional definition, configuration and designation to ensure consistent manufacturing and correct fit with mating drives.
Key technical points provided by the standard include references to configuration figures and a dimensions table (Figure 1 and Table 1), dimensional units and tolerancing conventions, and basic material and hardness requirements for driver tips.
Note: compliance may involve patent-protected designs. Patent rights are identified in the standard and are held by the Phillips Screw Company (ACR Multi-Ribbed Torq-Set). The standard records the patent holder’s willingness to license on reasonable, non-discriminatory terms.
Key Topics
- Scope and applicability: Metric ribbed drivers for internal offset cruciform drives in the nominal thread diameter range 1.6–20 mm.
- Configuration and dimensions: Dimensions and tolerances are given in millimetres and presented in Figure 1 / Table 1 of the standard.
- Tolerancing standards: Run-out and surface-profile tolerances conform to ISO 1101 (geometrical product specifications).
- Material and hardness: Drivers are to be made from tool steel and heat-treated to 56–62 HRC in the tip area (minimum J dimension as specified).
- Designation and coding: The standard prescribes a driver designation format and requires drivers to be used only with drives having the same coding.
- Design features: Ribs are located on the removal wall of the four wings; both ribbed and unribbed internal offset cruciform drives are covered (see ISO 14275 and ISO 14276 for drive definitions).
Applications
ISO 14277 is directly applicable to aerospace fastener manufacturing, procurement and quality assurance where internal offset cruciform drives are used. Practical benefits include:
- Interchangeability between driver and screw manufacturers, reducing mismatches during assembly.
- Improved durability and torque transfer by specifying material and tip hardness.
- Consistent inspection and acceptance criteria using defined dimensional and run-out tolerances.
- Procurement clarity for aerospace suppliers specifying driver codes and compatibility.
Typical users: fastener designers, tool manufacturers, aerospace OEMs, supply chain procurement, and quality engineers.
Related Standards
- ISO 14275:2002 - Drives, internal, offset cruciform, ribbed - Metric series (drive definitions)
- ISO 14276:2002 - Drives, internal, offset cruciform - Metric series (drive definitions)
- ISO 1101 - Geometrical product specifications (tolerancing of form, orientation, location and run-out)
For implementation, consult the full ISO 14277:2002 document for figures, Table 1 dimension data and the official patent statement and licensing contact details.
Open preview (PDF)Aerospace — Drivers, ribbed, for internal offset cruciform ribbed or unribbed drives — Metric series
