ISO 14581:2022
Fasteners — Hexalobular socket countersunk flat head screws (common head style) with reduced loadability

Standard No.

ISO 14581:2022

Release Date

2022

Published By

International Organization for Standardization (ISO)

Latest

ISO 14581:2022

Scope

This document specifies the characteristics of hexalobular socket countersunk flat head screws with reduced loadability due to head design, in steel and stainless steel, with metric coarse pitch threads M2 to M10, and with product grade A. If in certain cases other specifications are requested, stainless steel grades can be selected from NOTE 1 The reduced loadability (related to the countersunk head dimensions in combination with penetration of the hexalobular socket specified in this document) implies a limitation of ultimate tensile load shown by a specific marking (property class preceded by a zero). The loadability in the head is assumed to be 80 % of that in the thread for all sizes and all property classes; see Table 3. NOTE 2 Hexalobular socket countersunk head screws (high head), with full loadability are specified in NOTE 3 Particular attention is needed to ensure alignment of the countersunk head with the bearing surface of the countersink in the assembly.

ISO 14581:2022 Referenced Document

• ISO 10664 Hexalobular internal driving feature for bolts and screws
• ISO 10683 Fasteners - Non-electrolytically applied zinc flake coating systems
• ISO 1891-4 Fasteners — Vocabulary — Part 4: Control, inspection, delivery, acceptance and quality
• ISO 225 Fasteners - Bolts, screws, studs and nuts - Symbols and descriptions of dimensions
• ISO 3269 Fasteners — Acceptance inspection
• ISO 3506-1 Fasteners — Mechanical properties of corrosion-resistant stainless steel fasteners — Part 1: Bolts, screws and studs with specified grades and property classes
• ISO 3508 Thread run-outs for fasteners with thread in accordance with ISO 261 and ISO 262
• ISO 4042 Threaded components — Electroplated coatings*， 2024-04-22 Update
• ISO 4753 Fasteners - Ends of parts with external ISO metric thread
• ISO 4759-1 Tolerances for fasteners - Part 1: Bolts, screws, studs and nuts - Product grades A, B and C
• ISO 6157-1 Fasteners surface discontinuities; part 1: bolts, screws and studs for general requirements
• ISO 7721 Countersunk head screws; Head configuration and gauging
• ISO 888 Fasteners - Bolts, screws and studs - Nominal lengths and thread lengths
• ISO 898-1 Mechanical properties of fasteners made of carbon steel and alloy steel - Part 1: Bolts, screws and studs with specified property classes - Coarse thread and fine pitch thread; Technical Corrigendum 1
• ISO 8991 Designation system for fasteners
• ISO 8992 Fasteners - General requirements for bolts, screws, studs and nuts
• ISO 965-1 ISO general purpose metric screw threads — Tolerances — Part 1: Principles and basic data — Amendment 1

ISO 14581:2022 history

• 2022 ISO 14581:2022 Fasteners — Hexalobular socket countersunk flat head screws (common head style) with reduced loadability
• 2013 ISO 14581:2013 Fasteners.Hexalobular socket countersunk flat head screws