ISO 7053:2019 pdf download.Fasteners – Hexagon washer head tapping screws.
ISO 7053 specifies the characteristics of hexagon washer head tapping screws, made of steel and stainless steel, with thread sizes ST2,2 to ST8, and with product grade A.
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 ISO 7053. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
ISO 1478, Tapping screws thread
ISO 2702, Heat-treated steel tapping screws — Mechanical properties
ISO 3269, Fasteners — Acceptance inspection
ISO 3506-4, Mechanical properties of corrosion-resistant stainless steel fasteners — Part 4: Tapping screws
Iso 4042, Fasteners — Electroplated coating systems
Iso 4759-1, Tolerances for fasteners — Part 1: Bolts, screws, studs and nuts — Product grades A, B and C
Iso 8992, Fasteners — General requirements for bolts, screws, studs and nuts
ISO 10683, Fasteners — Non-electrolytically applied zinc flake coating systems
3 Terms and definitions
No terms and definitions are listed in ISO 7053.
4 Dimensions
Dimensions shall be in accordance with E1gircs 1 and Z and Table 1.
Symbols and descriptions of dimensions are defined in ISO 225.
a Optional indentation.
b Dimension a shall be measured at the core diameter of the first full thread.
Figure 1 — Hexagon washer head tapping screws
5 Requirements and reference International Standards
The requirements specified in the International Standards listed in Table 2 shall apply.
6 Designation
EXAMPLE 1 A hexagon washer head tapping screw with thread size ST39, nominal length l= 16 mm, made of steel (St) in accordance with Iso 2702 and rounded end (Type R) is designated as follows:
EXAMPLE 2 A hexagon washer head tapping screw with thread size ST3,9. nominal length l= 16 mm, made of stainless steel of grade A4 and with hardness class 20H (A4-20H) in accordance with ISO 3506-4 and cone end (Type C) is designated as follows:
Bibliography
ISO 225, Fasteners — Bolts, screws, studs and nuts — Symbols and descriptions of dimensions ISO 16048, Passivation of corrosion-resistant stainless-steel fasteners.ISO-7053-2019