SIST EN 3760:2001

Aerospace series - Screws, 100° countersunk normal head, offset cruciform recess, threaded to head, in heat and corrosion resisting steel, passivated - Classification: 1 100 MPa (at ambient temperature)/425 °C

This standard specifies the characteristics of screws, 100° countersunk normal head, offset cruciform recess, threaded to head, in heat and corrosion resisting steel, passivated. Classification: 1 100 MPa/425°C.

Luft- und Raumfahrt - 100° Senkschrauben mit Flügelkreuzschlitz, Gewinde annähernd bis Kopf, aus korrosionsbeständigem und hochwarmfestem Stahl, passiviert - Klasse: 1 100 MPa (bei Raumtemperatur)/425 °C

Diese Norm legt die Eigenschaften von 100° Senkschrauben mit Flügelkreuzschlitz, mit Gewinde annähernd bis Kopf, aus korrosionsbeständigem und hochwarmfestem Stahl, passiviert, fest. Klasse: 1 100 MPa / 425°C.

Série aérospatiale - Vis a tete fraisée 100° normale, a empreinte cruciforme déportée, filetées jusqu'a proximité de la tete, en acier résistant a chaud et a la corrosion, passivées - Classification: 1 100 MPa (a température ambiante)/425 °C

La présente norme spécifie les caractéristiques des vis à tête fraisée 100° normale, à empreinte cruciforme déportée, filetées jusqu'à proximité de la tête, en acier résistant à chaud et à la corrosion, passivées. Classification: 1 100 MPa/425°C.

Aerospace series - Screws, 100- countersunk normal head, offset cruciform recess, threaded to head, in heat and corrosion resisting steel, passivated - Classification: 1 100 MPa (at ambient temperature)/425 °C

General Information

• Status: Published
• Publication Date: 31-Dec-2000
• ICS: 49.030.20 - Bolts, screws, studs
• Technical Committee: SS SPL - Technical Board for the general field
• Current Stage: 6060 - National Implementation/Publication (Adopted Project)
• Start Date: 01-Jan-2001
• Due Date: 01-Jan-2001
• Completion Date: 01-Jan-2001
• Ref Project: EN 3760:1996 - Aerospace series - Screws, 100° countersunk normal head, offset cruciform recess, threaded to head, in heat and corrosion resisting steel, passivated - Classification: 1 100 MPa (at ambient temperature)/425 °C

Overview

EN 3760:1996 is a CEN aerospace standard that defines the characteristics of a specific type of high-performance screw: 100° countersunk normal head, offset cruciform recess, threaded to head, manufactured from heat and corrosion resisting steel and passivated. The document specifies mechanical classification as 1 100 MPa (at ambient temperature)/425 °C, making it suitable for aerospace applications requiring both high strength and elevated-temperature resistance.

Key topics and requirements

• Head form and geometry
  • 100° countersunk normal head for flush mounting in structural assemblies.
  • Offset cruciform recess (specialized Phillips-type recess) for drive engagement.
• Threading
  • Threaded to head (thread extends close to the head) to maximize grip length in short or thin components.
• Material and treatment
  • Heat and corrosion resisting steel to maintain mechanical properties at elevated temperatures.
  • Passivated surface condition to reduce corrosion risk and improve longevity.
• Mechanical classification
  • Specified as 1 100 MPa (at ambient temperature)/425 °C, indicating rated strength and elevated-temperature capability as defined in the standard text.
• Quality and conformity
  • Requirements typically cover dimensional tolerances, material verification, mechanical testing, and surface treatment acceptance criteria (refer to the full standard for test methods and inspection limits).

Applications

• Aerospace structural and engine assemblies where a flush, high-strength fastener is required.
• Components exposed to elevated temperatures (up to the classification limit) and corrosive environments, such as engine compartments, hot-air ducts, and external airframe attachments.
• Use cases include new aircraft design, refurbishment, maintenance/repair operations, and supply chain procurement where compliance with aerospace fastener standards is mandated.

Who uses EN 3760

• Aerospace design engineers specifying fasteners for high-temperature, corrosion-prone applications.
• Fastener manufacturers producing certified aerospace screws.
• Quality assurance and procurement teams verifying compliance for flight-critical components.
• Maintenance, repair, and overhaul (MRO) organizations applying correct replacements during service.

Related standards

• EN 3760 should be used alongside other aerospace and fastener standards (e.g., general fastener dimension and testing standards) to ensure full compliance across design, testing, and procurement processes.

Keywords: EN 3760, aerospace screws, 100° countersunk, offset cruciform recess, threaded to head, heat and corrosion resisting steel, passivated, high-temperature fasteners, aerospace fasteners, 1 100 MPa/425 °C.

Standards Content (Sample)

SLOVENSKI STANDARD
01-januar-2001
Aerospace series - Screws, 100- countersunk normal head, offset cruciform
recess, threaded to head, in heat and corrosion resisting steel, passivated -
Classification: 1 100 MPa (at ambient temperature)/425 °C
Aerospace series - Screws, 100° countersunk normal head, offset cruciform recess,
threaded to head, in heat and corrosion resisting steel, passivated - Classification: 1 100
MPa (at ambient temperature)/425 °C
Luft- und Raumfahrt - 100° Senkschrauben mit Flügelkreuzschlitz, Gewinde annähernd
bis Kopf, aus korrosionsbeständigem und hochwarmfestem Stahl, passiviert - Klasse: 1
100 MPa (bei Raumtemperatur)/425 °C
Série aérospatiale - Vis a tete fraisée 100° normale, a empreinte cruciforme déportée,
filetées jusqu'a proximité de la tete, en acier résistant a chaud et a la corrosion,
passivées - Classification: 1 100 MPa (a température ambiante)/425 °C
T
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