ISO 10207:1991

Overview

ISO 10207:1991 - "Rock drilling equipment - Rope threaded drill steel equipment for percussive drilling, nominal sizes 22 mm to 38 mm" specifies the basic dimensions and dimensional requirements for rope‑threaded drill steel equipment used in percussive rock drilling. The standard covers eight nominal sizes (including light and normal variants) across the 22 mm to 38 mm range and defines the geometry of the main components: hexagonal shank rods, extension rods (hexagonal and round), coupling sleeves, and drill bits.

Key topics and technical requirements

• Scope and nominal sizes: Defines eight nominal size variants between 22 mm and 38 mm for rope‑threaded drill steels (normal and light versions where applicable).
• Dimensional specifications: Provides figures and tables with the required basic dimensions and tolerances for:
  • Hexagonal shank rods (including central flushing provisions)
  • Extension rods (hexagonal and round; may include wrench flats)
  • Coupling sleeves - straight‑through and with middle stop
  • Drill bits - insert and button types
• Threading convention: Specifies left‑hand rope threads in conjunction with ISO 10208.
• Compatibility references: Uses related standards for complementary requirements (see Related Standards). The standard includes illustrative figures; a note clarifies figures are examples and not intended to constrain manufacturer design beyond the dimensioned requirements.
• Normative data format: Dimensions, tolerances and fit information are presented in standardized tables and drawings to ensure interchangeability and safe operation in percussive drilling assemblies.

Applications

ISO 10207 is focused on components used in percussion (percussive) rock drilling operations. Typical applications include:

• Surface and underground mining - blast hole and production drilling
• Quarrying and aggregates extraction
• Geotechnical and geological exploration (borehole drilling)
• Construction drilling where rope‑threaded drill steels and percussive tools are used By standardizing dimensions, ISO 10207 facilitates interchangeability of rods, couplings and bits across manufacturers and drill rigs, reducing downtime and procurement complexity.

Who should use this standard

• Manufacturers of drill steel, coupling sleeves and drill bits
• Mining and drilling equipment designers and engineers
• Procurement and maintenance teams for drilling operations
• Test and quality control laboratories verifying component dimensions
• Standards committees and regulatory bodies involved in mining equipment safety and interoperability

Related Standards

• ISO 10208:1991 - Rock drilling equipment - Left‑hand rope threads
• ISO 722:1991 - Hollow drill steels in bar form (hexagonal and round)
• ISO 723:1991 - Forged collared shanks and corresponding chuck bushings

Keywords: ISO 10207:1991, rock drilling equipment, rope threaded drill steel, percussive drilling, hexagonal shank rods, extension rods, coupling sleeves, drill bits, nominal sizes 22 mm to 38 mm.