ISO 3551-1:1992

Overview

ISO 3551-1:1992 specifies the nomenclature, leading dimensions and basic requirements for rotary core diamond drilling equipment - System A, metric units. The standard defines dimensional and interchangeability limits for drill rods and couplings, casings and casing accessories, core barrels and related diamond-set items for hole diameters from 30 mm to 200 mm and core diameters from 18.5 mm to 165 mm. It ensures components manufactured by different suppliers will fit and function together within System A limits.

Key Topics

• Scope and nomenclature: standardized names and identification symbols for drill rods, casings, core barrels and diamond-set components (see identification tables and figures).
• Dimensional system: leading dimensions and tolerances presented in comprehensive tables (tables 4–57) using a system of dimensional identification letters (A, B, C... W, X, Y, Z).
• Interchangeability: design rules to ensure compatibility across manufacturers within System A.
• Materials and mechanical properties: requirements for materials and minimum mechanical properties (tensile strength, yield stress, elongation) for tubes, rods and couplings (referenced in the standard’s tables).
• Manufacturing tolerances: specifications for eccentricity (max 10% of nominal wall thickness), straightness (maximum deviation 1 in 1 200 when rolled against a straightedge) and thread conventions (right‑hand threads by default; thread profiles and pitches defined).
• Design families: standardized design types (e.g., “W”, “WF”, “WG”, “WM”, “WT”) with associated dimensions for single- and double-tube core barrels, face/internal discharge designs and flush-jointed or flush-coupled casings.
• Lengths and units: nominal lengths in metric (and note on inch-based historical values); dimensions are given in millimetres for this Part.

Applications

ISO 3551-1 is used by:

• Drill equipment manufacturers to design and produce compatible drill rods, casings, core barrels and diamond bits for System A.
• Mining and exploration companies specifying equipment for diamond core drilling programs.
• Geotechnical and geological contractors requiring standardized tools for site investigation and core recovery.
• Procurement and quality teams ensuring purchased components meet interchangeability and mechanical property requirements. Practical benefits include reduced assembly errors, easier sourcing of replacement parts and reliable core recovery across multi‑supplier operations.

Related Standards

• ISO 3551-2 - System A, inch units (corresponding inch-based values)
• ISO 3552-1 - Rotary core diamond drilling equipment - System B - Part 1: Metric units
• ISO 8866 - Rotary core diamond drilling equipment - System C
• Normative references within the standard include ISO 263, ISO 5864 and industry documents (e.g., API 7, BS 1580) for thread and material practices.

Keywords: ISO 3551-1, rotary core diamond drilling equipment, System A, metric units, drill rods, casings, core barrels, interchangeability, dimensions, tolerances.