ISO 10664:2014 Hexalobular Drive for Bolts & Screws
Introduction
The hexalobular internal driving feature, commonly known as Torx or six-lobe drive, represents a significant advancement in fastener technology, offering superior torque transmission and reduced cam-out compared to traditional drives like Phillips or slotted. This design enhances assembly efficiency and reliability in various industries, including automotive, aerospace, and electronics.
ISO 10664:2014 specifies the shape and basic dimensions of the hexalobular internal driving feature for bolts and screws, including gauging methods. It ensures interchangeability and performance consistency across global manufacturing.This standard is widely applied in mechanical engineering for fasteners requiring high torque without damage to the drive or tool. It covers socket numbers from 1 to 100, defining key parameters such as major diameter (A), minor diameter (B), chamfer (c), and gauge insertion depth (f).
The standard applies to bolts and screws with internal hexalobular recesses, ensuring precise fit and function. For dimensions outside specified ranges, custom specifications may be needed, but adherence to ISO 10664 minimizes variability.This document also outlines gauging for quality control, recommending periodic checks to maintain manufacturing accuracy.It is suitable for metallic and non-metallic fasteners, provided the material allows for accurate recess formation. The standard does not cover external drives or specialized applications, which may be addressed in related ISO standards.
ISO 10664:2014 Standard Overview
ISO 10664 was first published in 1999 and revised in 2014 to incorporate advancements in manufacturing precision and gauging techniques. The 2014 edition remains current as of 2025.The scope includes the definition of hexalobular internal drive shapes and dimensions for bolts and screws, applicable to nominal sizes from M1.6 to M36 and beyond, with gauging to verify compliance.
Key contents cover drive geometry, tolerance zones, and inspection methods, ensuring global standardization for fastener production and use.
Basic Principles of Hexalobular Internal Driving Feature
The hexalobular drive is defined as a six-lobed recess that engages with a matching tool, distributing torque evenly across lobes to prevent stripping.The principle involves a lobular shape where the major diameter (A) defines the outer extent, and the minor diameter (B) the inner, with chamfers for ease of insertion.
Torque capacity is calculated based on drive size and material strength, but ISO 10664 focuses on dimensional accuracy rather than performance metrics.
Dimensions and Specifications
Dimensions are specified for socket numbers 1 to 100, with values in millimeters.
| Numéro de prise | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 15 | 20 | 25 | 27 | 30 | 40 | 45 | 50 | 55 | 60 | 70 | 80 | 90 | 100 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| A (Major Diameter) | 0.9 | 1 | 1.2 | 1.35 | 1.5 | 1.75 | 2.1 | 2.4 | 2.6 | 2.8 | 3.35 | 3.95 | 4.5 | 5.1 | 5.6 | 6.75 | 7.93 | 8.95 | 11.35 | 13.45 | 15.7 | 17.75 | 20.2 | 22.4 |
| B (Minor Diameter) | 0.6 | 0.7 | 0.85 | 1 | 1.1 | 1.27 | 1.5 | 1.75 | 1.9 | 2.05 | 2.4 | 2.85 | 3.25 | 3.68 | 4.05 | 4.85 | 5.64 | 6.45 | 8.05 | 9.6 | 11.2 | 12.8 | 14.4 | 16 |
| c (Chanfrein Max) | 0.13 | 0.13 | 0.13 | 0.13 | 0.13 | 0.13 | 0.13 | 0.13 | 0.13 | 0.13 | 0.13 | 0.25 | 0.25 | 0.25 | 0.25 | 0.25 | 0.25 | 0.25 | 0.25 | 0.25 | 0.25 | 0.25 | 0.25 | 0.25 |
| f (Gauge Insertion Depth) | 0.064 | 0.07 | 0.114 | 0.13 | 0.22 | 0.35 | 0.41 | 0.48 | 0.51 | 0.56 | 0.67 | 0.79 | 0.9 | 1.02 | 1.12 | 1.18 | 1.39 | 1.56 | 1.98 | 2.35 | 2.75 | 3.11 | 3.53 | 3.92 |
Key Requirements in ISO 10664:2014
The standard mandates precise manufacturing tolerances for A and B diameters to ensure tool engagement. Gauging uses go/no-go plugs to verify recess dimensions.
Chamfer (c) maximum values prevent interference, while f ensures sufficient depth for secure fastening.
Compliance testing focuses on dimensional accuracy, with results evaluated against specified limits for reliability.
Gauging and Inspection Analysis
Error sources include manufacturing variances in lobe radius or depth. Accuracy is improved through calibrated tools and regular machine maintenance.
Common errors like over-chamfering are resolved by adhering to ISO tolerances and using certified gauges.
ISO 10664:2014 Impact on Industry
This standard drives innovation in fastener design, enhancing material efficiency in R&D.
It supports quality control by standardizing inspections, reducing failures in production.
Applications include automotive assembly lines for engine components and aerospace for vibration-resistant fasteners.
Foire aux questions
Quelle est la différence entre les disques hexalobulaires et les disques hexagonaux ?
Hexalobular offers better torque distribution and cam-out resistance than hexagonal, ideal for high-torque applications.
How to select the appropriate socket number?
Choose based on fastener size and required torque; refer to ISO 10664 tables for matching dimensions.
What are the gauging requirements?
Use specified go/no-go gauges to check A, B, and f dimensions for compliance.
Can this standard be used for non-metallic fasteners?
Yes, if the material supports accurate recess formation, though metallic applications are primary.
What if dimensions fall outside the table?
Consult related standards or custom specifications; ISO 10664 provides baseline for interpolation.
How does ISO 10664 compare to Torx specifications?
ISO 10664 standardizes the Torx design globally, ensuring compatibility beyond proprietary limits.
