Aerospace series - Fasteners, externally threaded, in heat resisting nickel base alloy NI-PH2601 (Inconel 718) - Classification: 1 275 MPa/650 °C - Manufacturing method optional - Technical specification

This standard specifies the technical and quality assurance requirements for externally threaded fasteners in material NI-PH2601 (Inconel 718) of tensile strength class 1 275 MPa at room temperature, maximum test temperature of material 650 °C.
The externally threaded fasteners specified herein may be manufactured by machining from bar or by forging at the manufacturer's option, if forged there is no requirement for control of grainflow.
Primarily for Aerospace applications it is applicable to such externally threaded fasteners when referenced on the product standard or drawing.

Luft- und Raumfahrt - Verbindungselemente mit Außengewinde aus hochwarmfester Nickelbasislegierung NI-PH2601 (Inconel 718) - Klasse : 1 275 MPa/650 °C - Herstellverfahren nach Wahl - Technische Lieferbedingungen

Diese Norm legt die technischen Anforderungen und die Anforderungen an die Qualitätssicherung für
Verbindungselemente mit Außengewinde aus dem Werkstoff NI-PH2601 (Inconel 718), Zugfestigkeitsklasse
1 275 MPa bei Raumtemperatur, maximale Prüftemperatur des Werkstoffes 650 °C, fest.
Die in dieser Norm festgelegten Verbindungselemente mit Außengewinde können nach Wahl des Herstellers
durch Zerspanen von Stangen oder durch Schmieden hergestellt werden, bei geschmiedeten Verbindungselementen
ist keine Überprüfung des Faserverlaufs erforderlich.
Diese Norm gilt in erster Linie für Anwendungszwecke im Bereich Luft- und Raumfahrt und ist für diejenigen
Verbindungselemente mit Außengewinde anzuwenden, bei denen in der zugehörigen Produktnorm oder
Zeichnung auf sie verwiesen wird.

Série aérospatiale - Eléments de fixation, filetés, en alliage base nickel résistant à chaud NI-PH2601 (Inconel 718) - Classification: 1 275MPa/650 °C - Mode de fabrication non imposé - Spécification technique

Aeronavtika - Vezni elementi z zunanjim navojem iz toplotnoodporne zlitine na nikljevi osnovi NI-PH2601 (Inconel 718) - Klasifikacija: 1275 MPa/650 °C - Metoda izdelave po izbiri - Tehnična specifikacija

General Information

Status
Published
Publication Date
20-Apr-2009
ICS
49.060 - Aerospace electric equipment and systems
Technical Committee
I13 - Imaginarni 13
Current Stage
6060 - National Implementation/Publication (Adopted Project)
Start Date
09-Apr-2009
Due Date
14-Jun-2009
Completion Date
21-Apr-2009
Ref Project
EN 3388:2009 - Aerospace series - Fasteners, externally threaded, in heat resisting nickel base alloy NI-PH2601 (Inconel 718) - Classification 1 275 MPa/650 °C - Manufacturing method optional - Technical specification

Overview

EN 3388:2009 is a CEN aerospace technical specification for externally threaded fasteners made from heat‑resisting nickel‑base alloy NI‑PH2601 (Inconel 718). It defines the technical and quality assurance requirements for parts of tensile strength class 1 275 MPa at room temperature, with a maximum test temperature of 650 °C. The standard applies primarily to aerospace bolts, screws and studs when referenced on product standards or drawings. Manufacturing method is optional: parts may be machined from bar or forged (no grain‑flow control required if forged).

Key Topics

  • Material and strength class: NI‑PH2601 (Inconel 718), Rm class 1 275 MPa, max test temperature 650 °C.
  • Manufacturing routes: machining from specified bar grades or forging from approved bar; forging temperature limit ≤ 1 150 °C for hot forging.
  • Heat treatment:
    • Solution treatment: 930–1 010 °C, hold ≥ 1 h, air cool or faster.
    • Precipitation ageing: 720 ± 5 °C for 8 h, furnace cool ~55 °C/h to 620 °C, hold 8 h, then air cool (alternatives allowed to achieve ~18 h total precipitation time).
  • Threading and cold work: Threads shall be formed by a single thread rolling operation after required heat treatment; optional cold‑rolling of head-to‑shank fillet to remove machining marks.
  • Mechanical requirements:
    • Tensile testing per ISO 7961 (exceptions for very short parts where test bars are used).
    • Hardness: Rockwell C36–C45 (threaded/fillet areas may be higher due to cold working).
  • Surface quality and limits:
    • Surface oxide/contamination removal and abrasive blasting allowances.
    • Maximum oxide penetration on unmachined head surfaces 0.025 mm.
    • Discontinuity definitions and rejection criteria (cracks, seams, laps, inclusions).
  • Quality assurance and inspection:
    • Sampling and inspection schemes per ISO 2859‑1.
    • Non‑destructive testing (penetrant) per ISO 3452.
    • Manufacturer responsibility for inspection and test reports; quality system certification per ISO 9000 / EN 9100.

Applications

  • Use this standard when specifying aerospace externally threaded fasteners requiring high strength and elevated‑temperature resistance (Inconel 718/NI‑PH2601).
  • Typical users:
    • Aerospace designers and engineers specifying fasteners on product standards or drawings.
    • Manufacturers of high‑temperature fasteners selecting process controls, heat treatments and inspection regimes.
    • Quality and procurement teams verifying supplier compliance and test documentation.
  • Relevant where components operate at elevated temperatures up to 650 °C and require certified mechanical and metallurgical performance.

Related Standards

  • EN 2952, EN 2961, EN 3219 - material bar specifications for NI‑PH2601 and related nickel alloys.
  • ISO 7961 - bolt test methods.
  • ISO 2859‑1 - sampling procedures (AQL).
  • ISO 3452 - penetrant inspection.
  • ISO 6508‑1 - Rockwell hardness test.
  • EN 9100 / ISO 9000 - quality management and certification for aerospace suppliers.

Keywords: EN 3388:2009, Inconel 718, NI‑PH2601, aerospace fasteners, externally threaded fasteners, tensile strength 1 275 MPa, 650 °C, heat treatment, thread rolling, EN 2952, EN 2961, EN 9100.

Frequently Asked Questions

SIST EN 3388:2009 is a standard published by the Slovenian Institute for Standardization (SIST). Its full title is "Aerospace series - Fasteners, externally threaded, in heat resisting nickel base alloy NI-PH2601 (Inconel 718) - Classification: 1 275 MPa/650 °C - Manufacturing method optional - Technical specification". This standard covers: This standard specifies the technical and quality assurance requirements for externally threaded fasteners in material NI-PH2601 (Inconel 718) of tensile strength class 1 275 MPa at room temperature, maximum test temperature of material 650 °C. The externally threaded fasteners specified herein may be manufactured by machining from bar or by forging at the manufacturer's option, if forged there is no requirement for control of grainflow. Primarily for Aerospace applications it is applicable to such externally threaded fasteners when referenced on the product standard or drawing.

This standard specifies the technical and quality assurance requirements for externally threaded fasteners in material NI-PH2601 (Inconel 718) of tensile strength class 1 275 MPa at room temperature, maximum test temperature of material 650 °C. The externally threaded fasteners specified herein may be manufactured by machining from bar or by forging at the manufacturer's option, if forged there is no requirement for control of grainflow. Primarily for Aerospace applications it is applicable to such externally threaded fasteners when referenced on the product standard or drawing.

SIST EN 3388:2009 is classified under the following ICS (International Classification for Standards) categories: 49.060 - Aerospace electric equipment and systems. The ICS classification helps identify the subject area and facilitates finding related standards.

SIST EN 3388:2009 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.Luft- und Raumfahrt - Verbindungselemente mit Außengewinde aus hochwarmfester Nickelbasislegierung NI-PH2601 (Inconel 718) - Klasse : 1 275 MPa/650 °C - Herstellverfahren nach Wahl - Technische LieferbedingungenSérie aérospatiale - Eléments de fixation, filetés, en alliage base nickel résistant à chaud NI-PH2601 (Inconel 718) - Classification: 1 275MPa/650 °C - Mode de fabrication non imposé - Spécification techniqueAerospace series - Fasteners, externally threaded, in heat resisting nickel base alloy NI-PH2601 (Inconel 718) - Classification: 1 275 MPa/650 °C - Manufacturing method optional - Technical specification49.060Aerospace electric equipment and systemsICS:Ta slovenski standard je istoveten z:EN 3388:2009SIST EN 3388:2009en01-junij-2009SIST EN 3388:2009SLOVENSKI
STANDARD
EUROPEAN STANDARD NORME EUROPÉENNE EUROPÄISCHE NORM
EN 3388
April 2009 ICS 49.030.20 English Version
Aerospace series - Fasteners, externally threaded, in heat resisting nickel base alloy NI-PH2601 (Inconel 718) - Classification 1 275 MPa/650 °C - Manufacturing method optional - Technical specification
Série aérospatiale - Eléments de fixation, filetés, en alliage base nickel résistant à chaud NI-PH2601 (Inconel 718) - Classification : 1 275MPa/650 °C - Mode de fabrication non imposé - Spécification technique
Luft- und Raumfahrt - Verbindungselemente mit Außengewinde aus hochwarmfester Nickelbasislegierung NI-PH2601 (Inconel 718) - Klasse : 1 275 MPa/650 °C - Herstellverfahren nach Wahl - Technische Lieferbedingungen This European Standard was approved by CEN on 5 October 2008.
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.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION EUROPÄISCHES KOMITEE FÜR NORMUNG
Management Centre:
Avenue Marnix 17,
B-1000 Brussels © 2009 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN 3388:2009: ESIST EN 3388:2009

1) Published as ASD Prestandard at the date of publication of this standard. SIST EN 3388:2009

crack rupture in the material which may extend in any direction and which may be intercrystalline or transcrystallyne in character 3.3.2
seam longitudinal surface defect in the form of an unwelded open fold in the material 3.3.3
lap surface defect caused by folding over metal fins or sharp corners and then rolling or forging them into the surface 3.3.4
inclusion non-metallic particles originating from the material making process. They may exist as discrete particles or strings of particles extending longitudinally 3.4 test temperature ambient temperature, unless otherwise specified 3.5 simple random sampling the taking of n items from a population of N items in such a way that all possible combinations of n items have the same probability of being chosen [ISO 3534, see definition] 3.6 critical defect defect that according to judgment and experience is likely to result in hazardous or unsafe conditions for individuals using, maintaining, or depending upon the considered product or that is likely to prevent performance of the function of a major end item [ISO 3534, see definition] 3.7 major defect defect other than critical, that is likely to result in a failure or to reduce materially the usability of the considered product for its intended purpose [ISO 3534, see definition] SIST EN 3388:2009

Material Material NI-PA2601 to specification EN 2952, EN 2961 or EN 3219 supplied by an approved source: shall be used for the manufacture of bolts to this standard. As stated in the material specification.
5.2
Dimensions, tolerances and tolerances of form and position; threads and quality
A Tables 4 and 5
5.2.1
Dimensions The dimensions of the finished parts shall conform to the product standard or drawing. All dimensions shall be controlled by an approved system of gauging.
5.2.2
Tolerances of form and position Tolerances of form and position shall conform to the product standard or drawing. Tolerances of form and position shall be controlled by an approved system of gauging.
5.2.3
Threads Threads shall conform to the product standard or drawing. Threads shall be gauged by an approved system of gauging.
5.3
Manufacturing Parts may be manufactured by machining from material EN 2961 or by forging from material EN 2952 or EN 3219.
continued SIST EN 3388:2009
Machined from bar parts Parts manufactured from material in the softened, cold worked and solution treated condition shall be semi-finish machined and then precipitation heat treated per 5.3.3.2 prior to final machining, and thread rolling.Parts manufactured from material in the softened, cold worked, solution treated and precipitation treated condition shall be finish machined, thread rolled, etc. without further heat treatment.
5.3.2
Forged parts Forged parts may be formed by hot or cold forging. If hot forged, the forging temperature shall not exceed 1 150 °C and shall be air cooled. The heating equipment for forging shall be of a type which ensures a consistent temperature throughout the batch. The forged blanks shall be solution treated and precipitation treated.
5.3.3
Heat treatment The heat treatment medium or atmosphere shall not cause any surface contamination except as permitted by 5.5.2. The heat treatment equipment shall be approved.
Any scale which will not be removed by subsequent machining shall be removed by abrasive blasting. The equipment for abrasive blasting shall be approved.
5.3.3.1
Solution heat treatment Forged parts shall be solution treated at a temperature of 930 °C – 1 010 °C, holding at the selected temperature within ± 15 °C for not less than 1 hour, and air cool or faster.
continued SIST EN 3388:2009
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