EN 3307:1996

Aerospace series - Screws, pan head, offset cruciform recess, threaded to head, in titanium alloy, anodized, MoS2 lubricated - Classification: 1 100 MPa (at ambient temperature)/315 °C

This standard specifies the characteristics of screws, pan head, offset cruciform recess, threaded to head, in titanium alloy, anodized, MoS2 lubricated. Classification: 1100 MPa / 315°C.

Luft- und Raumfahrt - Flachkopfschrauben mit Flügelkreuzschlitz, Gewinde annähernd bis Kopf, aus Titanlegierung, anodisiert, MoS2-geschmiert - Klasse: 1 100 MPa (bei Raumtemperatur)/315 °C

Diese Norm legt die Eigenschaften von Flachkopf-Paßschrauben mit Flügelkreuzschlitz und Gewinde annähernd bis Kopf, aus Titanlegierung anodisiert, MoS2-geschmiert, fest. Klasse: 1100 MPa / 315°C.

Série aérospatiale - Vis à tête cylindrique, à empreinte cruciforme déportée, filetées jusqu'à proximité de la tête, en alliage de titane, anodisées, lubrifiées MoS2 - Classification: 1 100 MPa (à température ambiante)/315 °C

La présente norme spécifie les caractéristiques des vis à tête cylindrique, à empreinte cruciforme déportée, filetées jusqu'à proximité de la tête , en alliage de titane, anodisées, lubrifiées MoS2. Classification: 1100 MPa / 315°C.

Aerospace series - Screws, pan head, offset cruciform recess, threaded to head, in titanium alloy, anodized, MoS2 lubricated - Classification: 1 100 MPa (at ambient temperature)/315 °C

General Information

• Status: Published
• Publication Date: 24-Sep-1996
• Withdrawal Date: 30-Mar-1997
• ICS: 49.030.20 - Bolts, screws, studs
• Technical Committee: ASD-STAN - Aerospace
• Drafting Committee: ASD-STAN/D 3 - Mechanical
• Current Stage: 9093 - Decision to confirm - Review Enquiry
• Start Date: 31-May-2017
• Completion Date: 14-Apr-2025
• Ref Project: SIST EN 3307:2001 - Aerospace series - Screws, pan head, offset cruciform recess, threaded to head, in titanium alloy, anodized, MoS2 lubricated - Classification: 1 100 MPa (at ambient temperature)/315 °C

Overview

EN 3307:1996 is a European standard developed by CEN, specifying the requirements for aerospace-grade screws. These screws feature a pan head design with an offset cruciform recess, are threaded to the head, and manufactured from anodized titanium alloy. They are MoS2 (Molybdenum disulfide) lubricated to ensure reliable performance under demanding conditions. The screws are classified for a tensile strength of 1100 MPa at ambient temperature and maintain their integrity up to 315 °C. This standard is critical for aerospace applications where high strength, corrosion resistance, and high-temperature endurance are essential.

Key Topics

• Screw Type: Pan head with offset cruciform recess for enhanced torque application and reduced cam-out.
• Material: Titanium alloy, chosen for its excellent strength-to-weight ratio and corrosion resistance.
• Surface Treatment: Anodization process to improve surface hardness and corrosion protection.
• Lubrication: MoS2 coating provides low friction and wear resistance under extreme conditions.
• Mechanical Classification: Rated for 1100 MPa tensile strength at ambient temperature and performance assured up to 315 °C.
• Threading: Screws are threaded up to the head, enabling secure fastening even under high-stress scenarios.
• Aerospace Use: Designed specifically for aerospace applications requiring lightweight, durable, and heat-resistant fasteners.

Applications

• Aerospace Industry: Ideal for airframe assembly, engine components, and other critical aerospace systems where fastener reliability is paramount.
• High-Temperature Environments: Suitable for applications exposed to temperatures up to 315 °C without loss of mechanical integrity.
• Corrosion-Prone Conditions: Anodized titanium and MoS2 lubrication make these screws resistant to corrosion in aggressive environments.
• Precision Assembly: Offset cruciform recess allows precise torque control, reducing fastener damage during installation.
• Lightweight Structures: Titanium alloy screws help reduce overall component weight in aerospace and advanced engineering designs.

Related Standards

• EN 3306 - Covers general aerospace screw types and classifications.
• EN 2875 - Standard for titanium and titanium alloy fasteners for aerospace applications.
• ISO 4762 - Hexagon socket head cap screws, often used alongside pan head screws in aerospace assemblies.
• AS9100 - Quality management systems requirements, relevant for manufacturers of aerospace fasteners following EN 3307.
• MIL-DTL-81490 - US military standard for titanium alloy screws, providing complementary technical guidance.

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EN 3307:1996 ensures that aerospace screws made from titanium alloys meet stringent mechanical strength and environmental resistance criteria, making them indispensable for critical aerospace fastening tasks. Their classification at 1100 MPa and capability up to 315 °C reflect high-performance standards that support safety, durability, and functional reliability in advanced aerospace engineering.

Standards Content (Sample)

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Aerospace series - Screws, pan head, offset cruciform recess, threaded to head, in titanium alloy, anodized, MoS2 lubricated - Classification: 1 100 MPa (at ambient temperature)/315 °CLuft- und Raumfahrt - Flachkopfschrauben mit Flügelkreuzschlitz, Gewinde annähernd bis Kopf, aus Titanlegierung, anodisiert, MoS2-geschmiert - Klasse: 1 100 MPa (bei Raumtemperatur)/315 °CSérie aérospatiale - Vis a tete cylindrique, a empreinte cruciforme déportée, filetées jusqu'a proximité de la tete, en alliage de titane,
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