ISO 10684:2004 specifies material, process, dimensional and some performance requirements for hot dip spun galvanized coatings applied to coarse threaded steel fasteners from M8 up to and including M64 and for property classes up to and including 10.9 for bolts, screws and studs and 12 for nuts. It is not recommended to hot dip galvanize threaded fasteners in diameters smaller than M8 and/or with pitches below 1,25 mm. ISO 10684:2004 primarily concerns the spun hot dip galvanizing of threaded steel fasteners, but it may also be applied to other threaded steel parts. The specifications given in this document may also be applied to non-threaded steel parts such as washers.
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Foreword
1 Scope
2 Normative references
3 Terms and definitions
4 Materials
4.1 Raw material of parts
4.2 Zinc
5 Hot dip galvanizing procedures and precautions
5.1 Stress relief
5.2 Cleaning and pickling
5.3 Baking
5.4 Fluxing
5.5 Hot dip galvanizing
5.6 Spinning and quenching
5.7 Special requirements for nuts
5.8 Post-treatment
6 Requirements on thread tolerances and additional marking
6.1 General
6.2 Requirements and precautions in assembling hot dip galvanized threaded fasteners
6.3 Special requirements for marking when supplying fasteners in sealed containers
7 Mechanical properties of nuts tapped oversize and undersize threaded bolts, screws and studs
8 Coating requirements
8.1 Appearance of zinc coating
8.2 Considerations for hot dip galvanized washers
8.3 Zinc coating thickness
8.4 Adhesion of zinc coating
9 Lubrication
10 Ordering requirements
11 Designation
Annex A Special requirements for bolts, screws and nuts with thread sizes M8 and M10 (normative)
Annex B Limits of sizes for hot dip galvanized internal and external screw thread M8 (normative)
Annex C Calculation of minimum ultimate tensile loads and proof loads for bolts and screws M8 and M10 with threads undersized to tolerance class 6az (informative)
Annex D Surface areas of bolts, screws and nuts (informative)
Annex E Adherence of hot-dip galvanized coating (normative)
Annex F Strength of hot dip galvanized bolt or screw and nut assemblies (informative)0
6 Requirements on thread tolerances and additional marking
6.1 General
6.2 Requirements and precautions in assembling hot dip galvanized threaded fasteners
6.3 Special requirements for marking when supplying fasteners in sealed containers
7 Mechanical properties of nuts tapped oversize and undersize threaded bolts, screws and studs
8 Coating requirements
8.1 Appearance of zinc coating
8.2 Considerations for hot dip galvanized washers
8.3 Zinc coating thickness
8.4 Adhesion of zinc coating
9 Lubrication
10 Ordering requirements
11 Designation
Annex A Special requirements for bolts, screws and nuts with thread sizes M8 and M10 (normative)
Annex B Limits of sizes for hot dip galvanized internal and external screw thread M8 (normative)
Annex C Calculation of minimum ultimate tensile loads and proof loads for bolts and screws M8 and M10 with threads undersized to tolerance class 6az (informative)
Annex D Surface areas of bolts, screws and nuts (informative)
Annex E Adherence of hot-dip galvanized coating (normative)
Annex F Strength of hot dip galvanized bolt or screw and nut assemblies (informative)0
ISO 1460:1992 Metallic coatings -- Hot dip galvanized coatings on ferrous materials -- Gravimetric determination of the mass per unit area
ISO 1461:1999 Hot dip galvanized coatings on fabricated iron and steel articles -- Specifications and test methods
ISO 2064:1996 Metallic and other inorganic coatings -- Definitions and conventions concerning the measurement of thickness
ISO 1460:1992 Metallic coatings -- Hot dip galvanized coatings on ferrous materials -- Gravimetric determination of the mass per unit area
ISO 1461:1999 Hot dip galvanized coatings on fabricated iron and steel articles -- Specifications and test methods
ISO 2064:1996 Metallic and other inorganic coatings -- Definitions and conventions concerning the measurement of thickness
ISO 2178:1982 Non-magnetic coatings on magnetic substrates -- Measurement of coating thickness -- Magnetic method
ISO 898-1:1999 Mechanical properties of fasteners made of carbon steel and alloy steel -- Part 1: Bolts, screws and studs
ISO 898-2:1992 Mechanical properties of fasteners -- Part 2: Nuts with specified proof load values -- Coarse thread
ISO 8991:1986 Designation system for fasteners
ISO 965-1:1998 ISO general-purpose metric screw threads -- Tolerances -- Part 1: Principles and basic data
ISO 965-2:1998 ISO general purpose metric screw threads -- Tolerances -- Part 2: Limits of sizes for general purpose external and internal screw threads -- Medium quality
ISO 965-3:1998 ISO general purpose metric screw threads -- Tolerances -- Part 3: Deviations for constructional screw threads
ISO 965-4:1998 ISO general purpose metric screw threads -- Tolerances -- Part 4: Limits of sizes for hot-dip galvanized external screw threads to mate with internal screw threads tapped with tolerance position H or G after galvanizing
ISO 965-5:1998 ISO general purpose metric screw threads -- Tolerances -- Part 5: Limits of sizes for internal screw threads to mate with hot-dip galvanized external screw threads with maximum size of tolerance position h before galvanizing