EN 3326:2007
(Main)Aerospace series - Bolts, D-head, close tolerance, medium thread length, in heat resisting nickel base alloy NI-PH2601 (INCO 718) - Classification: 1 275 MPa/650 °C, unplated
Aerospace series - Bolts, D-head, close tolerance, medium thread length, in heat resisting nickel base alloy NI-PH2601 (INCO 718) - Classification: 1 275 MPa/650 °C, unplated
This standard specifies the dimensions of unplated D-head bolts, close tolerance, with MJ-thread, medium thread length, in heat resisting nickel base alloy NI-PH2601 to EN 2952 and EN 3219 for aerospace applications.
Maximum test temperature of the material is 650 °C.
These bolts are to be used in aerospace fastening systems mainly stressed in shearing force.
Luft- und Raumfahrt - DKopfPassschrauben, mittlere Gewindelänge, aus hochwarmfester Nickelbasislegierung NIPH2601 (INCO 718) - Klasse: 1 275 MPa/650 °C, blank
Diese Norm legt die Maße von blanken D Kopf Passschrauben mit MJ Gewinde und mittlerer Gewindelänge aus hochwarmfester Nickelbasislegierung NI PH2601 nach EN 2952 und EN 3219 für Anwendungen in der Luft und Raumfahrt fest.
Die maximale Prüftemperatur des Werkstoffes beträgt 650 °C.
Diese Schrauben sind in Verbindungssystemen der Luft und Raumfahrt zu verwenden, die hauptsächlich Scherbeanspruchungen ausgesetzt sind.
Série aérospatiale - Vis de précision, à tête anti-rotation, à filetage moyen, en alliage résistant à chaud à base de nickel NI-PH2601 (INCO 718) - Classification: 1 275 MPa/650 °C, nu
Aeronavtika - Sorniki, glava D, ozka toleranca, srednja navojna dolžina, iz toplotnoodporne zlitine na nikljevi osnovi NI-PH2601 (INCO 718) - Klasifikacija: 1 275 MPa/650 °C, brez prevleke
General Information
- Status
- Published
- Publication Date
- 11-Dec-2007
- Withdrawal Date
- 29-Jun-2008
- Technical Committee
- ASD-STAN - Aerospace
- Drafting Committee
- ASD-STAN/D 3 - Mechanical
- Current Stage
- 9093 - Decision to confirm - Review Enquiry
- Start Date
- 30-Jun-2017
- Completion Date
- 21-Jan-2026
Relations
- Effective Date
- 28-Jan-2026
Overview
EN 3326:2007 defines the dimensions and basic requirements for aerospace D-head bolts (D-shaped head), close tolerance, medium thread length, manufactured from heat‑resisting nickel‑base alloy NI‑PH2601 (INCO 718). These components are specified as unplated and classified for a tensile level of 1 275 MPa with a maximum test temperature of 650 °C. The standard targets bolts used in aerospace fastening systems that are primarily stressed in shearing force.
Key topics and requirements
- Material: Heat resisting nickel base alloy NI‑PH2601 in accordance with EN 2952 and EN 3219 (INCO 718 family).
- Mechanical classification: 1 275 MPa / 650 °C (maximum test temperature 650 °C).
- Geometry & tolerances: Dimensions, tolerances and masses are specified in the standard (see Figures 1, Tables 1–2). Diameter codes (050–100) and length codes are provided for selection.
- Thread form: MJ thread form (ISO 5855‑1 / ISO 5855‑2) with lead and runout per ISO 3353‑1; threads are normally rolled.
- Surface treatment: None (bolts are unplated).
- Marking: Identification and marking to EN 2424, Class A.
- Manufacturing details: Form features not explicitly stated are at the manufacturer’s option; sharp edges are to be broken to specified radii.
- Designation example: EN3326-080-050 (standard number – nominal diameter code – length code).
- Related technical spec: Bolts must also conform to EN 2583 technical specification where applicable.
Applications and users
- Intended for aerospace structural and engine applications where high‑temperature resistance and shear performance are critical.
- Typical users:
- Aerospace design and stress engineers specifying fasteners for high‑temperature or high‑shear joints
- Fastener manufacturers and forgings suppliers producing NI‑PH2601 components
- Quality, procurement and maintenance teams ensuring conformity to EN standards
- Certification bodies assessing component traceability and marking
Related standards
- ISO 3353‑1 - Lead and runout threads (rolled external threads)
- ISO 5855‑1 / ISO 5855‑2 - MJ threads (general requirements and limit dimensions)
- EN 2424 - Marking of aerospace products
- EN 2583 - Bolts, MJ threads, in NI‑PH2601 (technical specification)
- EN 2952 / EN 3219 - Material specifications for NI‑PH2601 bars for forged fasteners
EN 3326:2007 is essential when specifying unplated, D‑head, close‑tolerance bolts in aerospace fastener catalogs, procurement documents, or engineering drawings where high‑temperature nickel‑base alloy performance and precise thread geometry (MJ) are required.
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Frequently Asked Questions
EN 3326:2007 is a standard published by the European Committee for Standardization (CEN). Its full title is "Aerospace series - Bolts, D-head, close tolerance, medium thread length, in heat resisting nickel base alloy NI-PH2601 (INCO 718) - Classification: 1 275 MPa/650 °C, unplated". This standard covers: This standard specifies the dimensions of unplated D-head bolts, close tolerance, with MJ-thread, medium thread length, in heat resisting nickel base alloy NI-PH2601 to EN 2952 and EN 3219 for aerospace applications. Maximum test temperature of the material is 650 °C. These bolts are to be used in aerospace fastening systems mainly stressed in shearing force.
This standard specifies the dimensions of unplated D-head bolts, close tolerance, with MJ-thread, medium thread length, in heat resisting nickel base alloy NI-PH2601 to EN 2952 and EN 3219 for aerospace applications. Maximum test temperature of the material is 650 °C. These bolts are to be used in aerospace fastening systems mainly stressed in shearing force.
EN 3326:2007 is classified under the following ICS (International Classification for Standards) categories: 49.030.20 - Bolts, screws, studs. The ICS classification helps identify the subject area and facilitates finding related standards.
EN 3326:2007 has the following relationships with other standards: It is inter standard links to EN 2583:2019. Understanding these relationships helps ensure you are using the most current and applicable version of the standard.
EN 3326:2007 is available in PDF format for immediate download after purchase. The document can be added to your cart and obtained through the secure checkout process. Digital delivery ensures instant access to the complete standard document.
Standards Content (Sample)
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Aerospace series - Bolts, D-head, close tolerance, medium thread length, in heat resisting nickel base alloy NI-PH2601 (INCO 718) - Classification: 1 275 MPa/650 °C, unplatedAeronavtika - Sorniki, glava D, ozka toleranca, srednja navojna dolžina, iz toplotnoodporne zlitine na nikljevi osnovi NI-PH2601 (INCO 718) - Klasifikacija: 1 275 MPa/650 °C, brez prevlekeSérie aérospatiale - Vis de précision, à tête anti-rotation, à filetage moyen, en alliage résistant à chaud à base de nickel NI-PH2601 (INCO 718) - Classification: 1 275 MPa/650 °C, nuLuft- und Raumfahrt - D - Kopf - Paßschrauben, mittlere Gewindelänge, aus hochwarmfester Nickelbasislegierung NI-PH2601 (INCO 718) - Klasse: 1 275 MPa/650 °C, blankTa slovenski standard je istoveten z:EN 3326:2007SIST EN 3326:2008en49.030.20ICS:SLOVENSKI
STANDARDSIST EN 3326:200801-marec-2008
EUROPEAN STANDARD NORME EUROPÉENNE EUROPÄISCHE NORM
EN 3326
December 2007 ICS 49.030.20 English Version
Aerospace series - Bolts, D-head, close tolerance, medium thread length, in heat resisting nickel base alloy NI-PH2601 (INCO 718) - Classification: 1 275 MPa/650 °C, unplated
Série aérospatiale - Vis de précision, à tête anti-rotation, à filetage moyen, en alliage résistant à chaud à base de nickel NI-PH2601 (INCO 718) - Classification: 1 275 MPa/650 °C, nu
Luft- und Raumfahrt - D - Kopf - Paßschrauben, mittlere Gewindelänge, aus hochwarmfester Nickelbasislegierung NI-PH2601 (INCO 718) - Klasse: 1 275 MPa/650 °C, blankThis European Standard was approved by CEN on 5 November 2007.
CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such national standards 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 translation under the responsibility of a CEN member into its own language and notified to the CEN Management Centre has the same status as the official 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.
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B-1050 Brussels © 2007 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN 3326:2007: E
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