EN 3305:1996
(Main)Aerospace series - Screws, 100° countersunk reduced head, offset cruciform recess, close tolerance normal shank, short thread, in alloy steel, cadmium plated - Classification: 1 100 MPa (at ambient temperature)/235 °C
- Abstract
This standard specifies the characteristics of screws, 100° countersunk reduced head, offset cruciform recess, close tolerance normal shank, short thread, in alloy steel, cadmium plated. Classification: 1100 MPa / 235°C.
- Status
- Published
- Publication Date
- 24-Sep-1996
- Withdrawal Date
- 30-Mar-1997
- 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-Oct-2026
Overview
EN 3305:1996 (CEN) is an aerospace fastener standard that defines the characteristics of a specific screw type: 100° countersunk reduced head, offset cruciform recess, close-tolerance normal shank, short thread, manufactured in alloy steel and cadmium plated. The standard includes a strength classification of 1 100 MPa (1100 MPa) at ambient temperature / 235 °C, and establishes the requirements needed for use in aviation and space applications.
Key topics and requirements
The standard covers the essential characteristics and quality attributes for this aerospace screw type, including:
- Head and recess geometry: specification of the 100° countersunk reduced head form and the offset cruciform recess profile.
- Shank and thread form: designation of a close-tolerance normal shank with a short thread length suitable for flush mounting.
- Material and finish: screw material limited to alloy steel with cadmium plating, addressing corrosion resistance and surface treatment.
- Mechanical classification: strength grouping identified as 1 100 MPa (1100 MPa) at ambient / 235 °C, used to match fastener performance to design loads and elevated temperature conditions.
- Dimensional and tolerance control: requirements for close tolerance manufacture to ensure interchangeability and reliable fit in aerospace assemblies.
- Identification and marking: provisions for marking or identifying the classification and finish for procurement and inspection (general practice in aerospace standards).
Note: EN 3305:1996 specifies characteristics; for complete design and test procedures, users should consult complementary standards referenced in procurement or engineering documentation.
Applications
This standard is intended for use where high-strength, flush-fit fasteners are required in aerospace structures and systems:
- Aircraft structural assemblies where countersunk, low-profile heads are necessary for aerodynamic or structural reasons.
- Components requiring high-strength screws (1100 MPa class) with cadmium plating for improved corrosion protection.
- Aerospace OEMs, tier suppliers, maintenance/repair organizations, and quality inspectors specifying or verifying fasteners for airframe and systems applications.
Who should use this standard
- Aerospace design and stress engineers specifying fasteners.
- Procurement teams and suppliers sourcing certified fasteners to EN 3305.
- Quality assurance and inspection personnel verifying material, plating, geometry, and classification.
- Regulatory and certification bodies reviewing component conformity.
Related standards
EN 3305 is part of the broader suite of aerospace fastener standards. Complementary documents (EN/ISO series for fasteners, material and plating standards, and test-method standards) are typically referenced alongside EN 3305 for full procurement and qualification requirements.
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Frequently Asked Questions
EN 3305:1996 is a standard published by the European Committee for Standardization (CEN). Its full title is "Aerospace series - Screws, 100° countersunk reduced head, offset cruciform recess, close tolerance normal shank, short thread, in alloy steel, cadmium plated - Classification: 1 100 MPa (at ambient temperature)/235 °C". This standard covers: This standard specifies the characteristics of screws, 100° countersunk reduced head, offset cruciform recess, close tolerance normal shank, short thread, in alloy steel, cadmium plated. Classification: 1100 MPa / 235°C.
This standard specifies the characteristics of screws, 100° countersunk reduced head, offset cruciform recess, close tolerance normal shank, short thread, in alloy steel, cadmium plated. Classification: 1100 MPa / 235°C.
EN 3305:1996 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 3305:1996 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 - Screws, 100° countersunk reduced head, offset cruciform recess, close tolerance normal shank, short thread, in alloy steel, cadmium plated - Classification: 1 100 MPa (at ambient temperature)/235°CLuft- und Raumfahrt - 100° Senk-Paßschrauben mit kleinem Kopf, mit Flügelkreuzschlitz, kurzes Gewinde, aus legiertem Stahl, verkadmet - Klasse: 1 100 MPa (bei Raumtemperatur)/235 °CSérie aérospatiale - Vis a tete fraisée 100° réduite, a empreinte cruciforme déportée, tige normale a tolérance serrée, filetage court, en acier allié,
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