SIST EN 4267:2002

Overview

EN 4267:2001 - Aerospace series - Round bars in titanium and titanium alloys - Diameter 6 mm ≤ D ≤ 160 mm - Dimensions is a CEN (European) standard that defines the dimensional and geometric requirements for round titanium bars intended for aerospace use. It specifies diameter ranges, dimensional tolerances, recommended masses, straightness and roundness measurement methods, and ordering/length rules for semi‑finished titanium products.

Key Topics

• Scope and material: Round bars in titanium and titanium alloys for aerospace applications with diameters from 6 mm to 160 mm.
• Dimensional tolerances: Diameter tolerance bands are given by diameter ranges (for example 6–12 mm, 12–18 mm, up to 120–160 mm). The standard provides precise tolerance values for each range and corresponding roundness tolerances.
• Recommended linear mass: A table of nominal diameters and linear masses is provided (mass values calculated using a density of 4.5 kg/dm³).
• Lengths and supply: Bars may be ordered in fixed or random lengths; where random lengths are supplied the minimum and maximum must be specified on the order.
• Geometric tolerances:
  • Straightness: Tolerances differ depending on heat treatment/state (annealed vs. solution treated/precipitation treated). Measurement method and symbols reference EN 3848.
  • Roundness: Measurement method and tolerance limits are given; EN 3848 is the normative reference for form deviation measurement.
• Normative references: Key cross‑references include EN 3848 (method of measuring form deviations) and EN 4258 (organization of aerospace metallic material standards).

Applications and Users

EN 4267:2001 is used by organizations involved in the production, procurement, inspection and design of aerospace materials:

• Aerospace OEMs and Tier 1 suppliers specifying raw material dimensions for structural and machined components.
• Material producers and stockists producing and certifying titanium round bars to aerospace dimensional requirements.
• Quality assurance and inspection teams applying the standard’s tolerances and measurement methods.
• Design and procurement engineers who need consistent feedstock dimensions and tolerances for machining, forging or fabrication of aerospace parts.

Practical uses include specifying feedstock for machined parts, shafts, fittings and other aerospace components where dimensional accuracy, straightness and roundness are critical.

Related Standards

• EN 3848 - Aerospace series: Method of measuring form deviations (referenced for straightness/roundness measurement).
• EN 4258 - General organization of aerospace metallic material standards (series structure and links between EN types).
• Issued under CEN with input from AECMA (European Association of Aerospace Manufacturers).

Keywords: EN 4267:2001, titanium round bars, titanium alloys, aerospace standard, dimensions, tolerances, straightness, roundness, EN 3848, EN 4258.