EN 3368:2008

Aerospace series - Aerospace design standard - Holes for locating pins

This standard provides particulars of hole sizes and associated fitting conditions to suit locating pins EN 3150 and EN 3151 series.

Luft- und Raumfahrt - Löcher für Zylinderstifte - Konstruktionsnorm

Diese Norm enthält Angaben zu den Lochmaßen und jeweiligen Passungsbedingungen für Zylinderstifte nach EN 3150 und EN 3151.

Série aérospatiale - Trous pour pieds de centrage - Normes de conception

Aeronavtika - Standard za projektiranje - Luknje za valjaste zatiče

General Information

• Status: Published
• Publication Date: 01-Apr-2008
• Withdrawal Date: 30-Oct-2008
• ICS: 49.030.01 - Fasteners in general
• Technical Committee: ASD-STAN - Aerospace
• Drafting Committee: ASD-STAN/D 3 - Mechanical
• Current Stage: 6060 - Definitive text made available (DAV) - Publishing
• Start Date: 02-Apr-2008
• Completion Date: 02-Apr-2008
• Ref Project: SIST EN 3368:2008 - Aerospace series - Aerospace design standard - Holes for locating pins

Overview

EN 3368:2008 - "Aerospace series - Aerospace design standard - Holes for locating pins" is a CEN/ASD‑STAN European standard that specifies hole sizes and associated fitting conditions to suit locating pins defined in EN 3150 and EN 3151. Published as a European Standard (approved 3 Nov 2007, issued Apr 2008), EN 3368:2008 gives designers and manufacturers the dimensional data, tolerance grades and assembly guidance needed to ensure accurate, repeatable location of components with locating pins in aerospace assemblies.

Key topics and requirements

• Hole sizes and tolerance grades: Dimensional particulars for holes to match nominal pin diameters (typical pin sizes covered: 3 mm to 10 mm) and the recommended hole tolerance grade designations (for example H7, K7, C9, D9).
• Positional tolerances: Specified positional tolerances for locating holes based on pitch circle diameter or maximum center distance to support accurate part registration.
• Chamfers and counterbores: Chamfer dimensions and counterbore sizes (applicable when using EN 3150 series locating pins) with figures and tabulated dimensions for proper lead‑in and seating.
• Air release holes: Requirements for air release holes in blind holes (e.g., recommended diameters for small and larger pin sizes) to avoid trapped air during insertion.
• Fitting conditions: Guidance on interference and clearance fits for different materials - steel, nimonic, titanium and similar alloys, and light alloys - including recommended fit ranges by pin diameter and pitch circle.
• Illustrative figures and tables: The standard contains Figures 1–4 and Tables 1–6 that present nominal pin dimensions, hole tolerances, counterbore details and fitting-condition ranges.

Note: the foreword highlights that some elements may be subject to patent rights; users should verify IP status where applicable.

Applications and who uses it

• Aerospace mechanical designers and structural engineers specifying locating features for assemblies.
• Manufacturing and CNC programmers choosing drill/bore sizes, chamfers and counterbores.
• Quality, inspection and metrology teams verifying hole positional tolerances and fits.
• Procurement and suppliers of precision dowels/locating pins to ensure parts conform to EN 3150 / EN 3151 compatibility.
• Repair and overhaul organizations needing standardized replacement or retrofit details.

Using EN 3368:2008 helps ensure interchangeability, accurate assembly registration, reduced rework and predictable fit performance across aerospace components.

Related standards

• EN 3150 - Pins, shoulder, headless (NI‑P100HT / Inconel 718)
• EN 3151 - Dowels, plain (NI‑P100HT / Inconel 718)

Keywords: EN 3368:2008, holes for locating pins, locating pins, aerospace design standard, hole sizes, positional tolerance, counterbore, air release holes, fitting conditions, EN 3150, EN 3151.

Standards Content (Sample)

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.þHLuft- und Raumfahrt - Löcher für Zylinderstifte - KonstruktionsnormSérie aérospatiale - Trous pour pieds de centrage - Normes de conceptionAerospace series - Aerospace design standard - Holes for locating pins49.030.40Pins, nailsICS:Ta slovenski standard je istoveten z:EN 3368:2008SIST EN 3368:2008en,de01-julij-2008SIST EN 3368:2008SLOVENSKI
STANDARD
EUROPEAN STANDARDNORME EUROPÉENNEEUROPÄISCHE NORMEN 3368April 2008ICS 49.030.01 English VersionAerospace series - Aerospace design standard - Holes forlocating pinsSérie aérospatiale - Trous pour pieds de centrage - Normesde conceptionLuft- und Raumfahrt - Löcher für Zylinderstifte -KonstruktionsnormThis European Standard was approved by CEN on 3 November 2007.CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this EuropeanStandard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such nationalstandards may be obtained on application to the CEN Management Centre or to any CEN member.This European Standard exists in three official versions (English, French, German). A version in any other language made by translationunder the responsibility of a CEN member into its own language and notified to the CEN Management Centre has the same status as theofficial versions.CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Cyprus, Czech Republic, Denmark, Estonia, Finland,France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal,Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.EUROPEAN COMMITTEE FOR STANDARDIZATIONCOMITÉ EUROPÉEN DE NORMALISATIONEUROPÄISCHES KOMITEE FÜR NORMUNGManagement Centre: rue de Stassart, 36
B-1050 Brussels© 2008 CENAll rights of exploitation in any form and by any means reservedworldwide for CEN national Members.Ref. No. EN 3368:2008: ESIST EN 3368:2008

Figures Figure 1.5 Figure 2.5 Figure 3.6 Figure 4.6
Tables Table 1.4 Table 2.7 Table 3.7 Table 4.8 Table 5.8 Table 6 — Counterbore sizes.8
EN 336
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