ISO 1482:2011

Overview

ISO 1482:2011 specifies the characteristics of slotted countersunk (flat) head tapping screws. The standard covers dimensional requirements, head forms and types, materials and mechanical properties, finishes, tolerances and acceptance criteria for tapping screws with thread sizes ST 2,2 to ST 9,5. ISO 1482:2011 is the second edition (2011), prepared by ISO/TC 2 (Fasteners), SC 13 (Fasteners with non‑metric thread).

Key topics and requirements

• Scope and thread sizes: Applies to slotted countersunk (flat) head tapping screws with thread sizes from ST 2,2 to ST 9,5 inclusive.
• Dimensions and head types: Defines head configuration and dimensional values (Type C, Type F, Type R) with a full table of dimensions (see Figure 1 and Table 1 in the standard).
• Materials and mechanical properties:
  • Steel tapping screws in accordance with ISO 2702.
  • Corrosion‑resistant stainless steel per ISO 3506‑4 (examples: A2‑20H, A4‑20H, A5‑20H).
  • Mechanical property / hardness class and product grade (grade A) are specified.
• Thread form and quality: Thread requirements reference ISO 1478 (tapping screws thread).
• Tolerances and general requirements: Tolerances per ISO 4759‑1; general fastener requirements per ISO 8992.
• Finishes and coatings:
  • Electroplating requirements: ISO 4042.
  • Zinc flake (non‑electrolytic) coatings: ISO 10683.
  • Passivation of stainless steel fasteners: ISO 16048.
• Acceptance and inspection: Acceptance inspection requirements refer to ISO 3269.
• Designation examples: e.g., “Tapping screw ISO 1482 - ST 3,5 × 16 - St - R” (steel, rounded end).

Applications and who uses ISO 1482

• Product designers and engineers specifying fasteners for sheet‑metal assemblies, appliances, electrical enclosures, automotive trim, construction fixtures and general manufacturing.
• Fastener manufacturers and quality teams using the dimensional tables, material grades and inspection criteria to produce and verify compliant tapping screws.
• Procurement and purchasing professionals who need unambiguous part designations and standardized specifications for sourcing.
• Testing and inspection labs applying acceptance inspection methods and tolerances referenced in the standard.
• Use cases: reliable fastening in sheet metal, appliance assembly, lightweight structures and where a countersunk (flat) head is required for a flush finish.

Related standards (normative references)

• ISO 225, ISO 1478, ISO 2702, ISO 3269, ISO 3506‑4, ISO 4042, ISO 4759‑1, ISO 7721, ISO 8992, ISO 10683, ISO 16048

Keywords: ISO 1482, slotted countersunk head tapping screws, tapping screws, ST thread sizes, fastener standards, dimensions and tolerances, stainless steel tapping screws.