Aerospace series - Screws, reduced pan head, offset cruciform recess, relieved shank, long thread, in heat resisting steel FEPA92HT (A286), silver plated - Classification: 900 MPa/650 °C

This document specifies the requirements for offset cruciform recess pan head screws with relieved shank and long thread in heat resisting steel FE-PA92HT, silver plated, tensile strength class 900 MPa at room temperature. The maximum test temperature of the material is 650 °C.

Luft- und Raumfahrt - Flachkopfschrauben mit geripptem Flügelkreuzschlitz, Dünnschaft, langes Gewinde, aus hochwarmfestem Stahl FE‑PA92HT (A286), versilbert - Klasse: 900 MPa/650 °C

Dieses Dokument legt die Anforderungen an Flachkopfschrauben mit Flügelkreuzschlitz, Dünnschaft und langem Gewinde aus hochwarmfestem Stahl FE PA92HT, versilbert, in der Zugfestigkeitsklasse 900 MPa bei Raumtemperatur fest. Die maximale Prüftemperatur des Werkstoffes beträgt 650 °C.

Série aérospatiale - Vis à tête cylindrique, réduite, à empreinte cruciforme déportée, à tige réduite, à filetage long, en acier résistant à chaud FE-PA92HT (A286), argentées - Classification: 900 MPa/650 °C

Le présent document spécifie les exigences pour les vis à tête cylindrique, à empreinte cruciforme déportée, tige dégagée et filetage long, en acier résistant à chaud FE-PA92HT (A286), argentées, de classe de résistance à la traction de 900 MPa à température ambiante. La température maximale d’essai du matériau est de 650 °C

Aeronavtika - Vijaki, nizka valjasta glava, križna zareza, dolgi navoj do glave, iz toplotnoodpornega jekla FE-PA92HT (A286), posrebreni - Klasifikacija: 900 MPa/650 °C

General Information

Status
Not Published
Public Enquiry End Date
22-Oct-2025
ICS
49.025.10 - Steels
 
49.030.20 - Bolts, screws, studs
Technical Committee
I13 - Imaginarni 13
Current Stage
4020 - Public enquire (PE) (Adopted Project)
Start Date
19-Aug-2025
Due Date
06-Jan-2026
Completion Date
23-Oct-2025
Ref Project
prEN 3636 - Aerospace series - Screws, reduced pan head, offset cruciform recess, relieved shank, long thread, in heat resisting steel FEPA92HT (A286), silver plated - Classification: 900 MPa/650 °C

Relations

Revises
SIST EN 3636:2008 - Aerospace series - Screws, reduced pan head, offset cruciform recess, relieved shank, long thread, in heat resisting steel FE-PA92HT (A286), silver plated - Classification: 900 MPa/650 °C
Effective Date
23-Oct-2024

Overview

prEN 3636 (draft) is a CEN aerospace standard that specifies requirements for reduced pan head screws with an offset cruciform recess, relieved shank and long thread, manufactured in heat‑resisting steel FE‑PA92HT (A286), silver plated. The fasteners are classified 900 MPa / 650 °C - meaning a minimum tensile strength class of 900 MPa at room temperature and a maximum material test temperature of 650 °C. This draft updates and will supersede EN 3636:2008 and is intended for use across European aerospace supply chains.

Key Topics and Technical Requirements

  • Material: Heat‑resisting steel FE‑PA92HT in accordance with EN 2398 or EN 2399 (A286 family).
  • Mechanical classification: Tensile strength class 900 MPa at room temperature; maximum test temperature 650 °C.
  • Surface coating: Electrolytic silver plating per EN 2786; coating thickness 3 µm to 6 µm on thread flanks (measured at pitch diameter).
  • Geometry & tolerances: Reduced pan head configuration, relieved shank, long thread - dimensions and tolerances defined by referenced figures and Tables 1–2; thread forms and limits per ISO 3353-1 and ISO 5855 series.
  • Drive & gauges: Offset cruciform ribbed recess requirements follow ISO 14275 / ISO 14277 / ISO 14278.
  • Marking & designation: Marking style and manufacturer monogram per EN 2424; formal designation format (example: SCREW REDUCED PAN EN 3636-030 010).
  • Technical specification linkage: Technical specification aligns with EN 3043 for heat‑resisting fasteners.

Applications and Who Uses It

This standard targets components where high strength and elevated temperature resistance are critical:

  • Aerospace structural and engine assemblies (hot sections, exhaust systems, turbo machinery).
  • Aircraft OEMs, Tier‑1/2 fastener manufacturers and specialist heat‑resistant fastener suppliers.
  • Quality assurance, procurement, engineering design teams, maintenance and repair organizations specifying or accepting fasteners for high‑temperature aerospace service.
  • Regulatory and conformity bodies requiring standardized marking, traceability and material verification.

Related Standards

Relevant referenced standards include:

  • EN 2398 / EN 2399 (FE‑PA92HT bar requirements)
  • EN 2786 (electrolytic silver plating)
  • EN 3043 (technical specification for fasteners in FE‑PA92HT)
  • ISO 3353‑1, ISO 5855‑1/2 (threads), ISO 14275/14277/14278 (drives & gauges)
  • EN 2424 (marking of aerospace products)

By aligning procurement, design and manufacturing to prEN 3636, organizations ensure consistent performance, traceability and interchangeability of high‑temperature aerospace screws in safety‑critical applications.

Frequently Asked Questions

oSIST prEN 3636:2025 is a draft published by the Slovenian Institute for Standardization (SIST). Its full title is "Aerospace series - Screws, reduced pan head, offset cruciform recess, relieved shank, long thread, in heat resisting steel FEPA92HT (A286), silver plated - Classification: 900 MPa/650 °C". This standard covers: This document specifies the requirements for offset cruciform recess pan head screws with relieved shank and long thread in heat resisting steel FE-PA92HT, silver plated, tensile strength class 900 MPa at room temperature. The maximum test temperature of the material is 650 °C.

This document specifies the requirements for offset cruciform recess pan head screws with relieved shank and long thread in heat resisting steel FE-PA92HT, silver plated, tensile strength class 900 MPa at room temperature. The maximum test temperature of the material is 650 °C.

oSIST prEN 3636:2025 is classified under the following ICS (International Classification for Standards) categories: 49.025.10 - Steels; 49.030.20 - Bolts, screws, studs. The ICS classification helps identify the subject area and facilitates finding related standards.

oSIST prEN 3636:2025 has the following relationships with other standards: It is inter standard links to SIST EN 3636:2008. Understanding these relationships helps ensure you are using the most current and applicable version of the standard.

oSIST prEN 3636:2025 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)


SLOVENSKI STANDARD
01-oktober-2025
Aeronavtika - Vijaki, nizka valjasta glava, križna zareza, dolgi navoj do glave, iz
toplotnoodpornega jekla FE-PA92HT (A286), posrebreni - Klasifikacija: 900
MPa/650 °C
Aerospace series - Screws, reduced pan head, offset cruciform recess, relieved shank,
long thread, in heat resisting steel FEPA92HT (A286), silver plated - Classification: 900
MPa/650 °C
Luft- und Raumfahrt - Flachkopfschrauben mit geripptem Flügelkreuzschlitz, Dünnschaft,
langes Gewinde, aus hochwarmfestem Stahl FE‑PA92HT (A286), versilbert - Klasse:
900 MPa/650 °C
Série aérospatiale - Vis à tête cylindrique, réduite, à empreinte cruciforme déportée, à
tige réduite, à filetage long, en acier résistant à chaud FE-PA92HT (A286), argentées -
Classification: 900 MPa/650 °C
Ta slovenski standard je istoveten z: prEN 3636
ICS:
49.025.10 Jekla Steels
49.030.20 Sorniki, vijaki, stebelni vijaki Bolts, screws, studs
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

DRAFT
EUROPEAN STANDARD
NORME EUROPÉENNE
EUROPÄISCHE NORM
July 2025
ICS 49.030.20 Will supersede EN 3636:2008
English Version
Aerospace series - Screws, reduced pan head, offset
cruciform recess, relieved shank, long thread, in heat
resisting steel FEPA92HT (A286), silver plated -
Classification: 900 MPa/650 °C
Série aérospatiale - Vis à tête cylindrique, réduite, à Luft- und Raumfahrt - Flachkopfschrauben mit
empreinte cruciforme déportée, à tige réduite, à geripptem Flügelkreuzschlitz, Dünnschaft, langes
filetage long, en acier résistant à chaud FE-PA92HT Gewinde, aus hochwarmfestem Stahl FE-PA92HT
(A286), argentées - Classification: 900 MPa/650 °C (A286), versilbert - Klasse: 900 MPa/650 °C
This draft European Standard is submitted to CEN members for enquiry. It has been drawn up by the Technical Committee ASD-
STAN.
If this draft becomes a European Standard, 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.

This draft European Standard was established by CEN 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-CENELEC
Management Centre has the same status as the official versions.

CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia,
Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway,
Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Türkiye and
United Kingdom.
Recipients of this draft are invited to submit, with their comments, notification of any relevant patent rights of which they are
aware and to provide supporting documentation.

Warning : This document is not a European Standard. It is distributed for review and comments. It is subject to change without
notice and shall not be referred to as a European Standard.

EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION

EUROPÄISCHES KOMITEE FÜR NORMUNG

CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2025 CEN All rights of exploitation in any form and by any means reserved Ref. No. prEN 3636:2025 E
worldwide for CEN national Members.

Contents Page
European foreword . 3
1 Scope . 4
2 Normative references . 4
3 Terms and definitions . 4
4 Required characteristics . 4
4.1 Configuration — Dimensions — Tolerances . 4
4.2 Material . 5
4.3 Surface coating . 5
5 Designation . 8
6 Marking . 8
7 Technical specification . 8
European foreword
This document (prEN 3636:2025) has been prepared by ASD-STAN.
After enquiries and votes carried out in accordance with the rules of this Association, this document has
received the approval of the National Associations and the Official Services of the member countries of
ASD-STAN, prior to its presentation to CEN.
This document is
...

Questions, Comments and Discussion

Ask us and Technical Secretary will try to provide an answer. You can facilitate discussion about the standard in here.

Loading comments...