EN 3303:1997

Aerospace series - Screw, cap head, hexagon socket, coarse tolerance normal shank, medium length thread, in alloy steel, cadmium plated - Classification: 1 100 MPa (at ambient temperature)/235°C

This standard specifies the characteristics of screws, cap head, hexagon socket,coarse tolerance normal shank, medium length thread, in alloy steel, cadmium plated. Classification: 1100 MPa/235°C.

Luft- und Raumfahrt - Zylinderschrauben mit Innensechskant, mittlere Gewindelänge, aus legiertem Stahl, verkadmet - Klasse: 1 100 MPa (bei Raumtemperatur)/235°C

Diese Norm legt die Eigenschaften von Zylinderschrauben mit Innensechskant und mittlerer Gewindelänge, aus legiertem Stahl, verkadmet, fest. Klasse: 1100 MPa/235°C.

Série aérospatiale - Vis à tête cylindrique, à six pans creux, tige normale à tolérance large, filetage moyen, en acier allié, cadmiées - Classification: 1 100 MPa (à température ambiante)/235°C

La présente norme spécifie les caractéristiques des vis à tête cylindrique, à six pans creux, tige normale à tolérance large, filetage moyen, en acier allié, cadmiées. Classification: 1100 MPa/235°C.

Aerospace series - Screw, cap head, hexagon socket, coarse tolerance normal shank, medium length thread, in alloy steel, cadmium plated - Classification: 1 100 MPa (at ambient temperature)/235°C

General Information

• Status: Published
• Publication Date: 21-Jan-1997
• Withdrawal Date: 30-Jul-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: 30-Jun-2017
• Completion Date: 11-Feb-2026
• Ref Project: SIST EN 3303:2001 - Aerospace series - Screw, cap head, hexagon socket, coarse tolerance normal shank, medium length thread, in alloy steel, cadmium plated - Classification: 1 100 MPa (at ambient temperature)/235°C

Overview

EN 3303:1997 (SIST EN 3303:2001) is a CEN aerospace-series standard that defines the characteristics of a specific type of fastener: a cap head screw with hexagon socket, coarse tolerance normal shank and medium length thread, made from alloy steel and cadmium plated. The standard includes a strength classification of 1100 MPa (at ambient temperature) / 235°C, and is catalogued under ICS 49.030.20 (bolts, screws, studs). The Slovenian adoption appears as SIST EN 3303:2001 and contains multilingual identification (Slovenian, German, French).

Key Topics

This standard focuses on the essential characteristics and classification for this aerospace fastener type. Key technical topics covered include:

• Fastener type and geometry: cap (cylindrical) head with hexagon (Allen) socket.
• Shank and thread specification: coarse tolerance, normal shank with medium thread length.
• Material and coating: alloy steel construction with cadmium plating for corrosion resistance.
• Strength classification: rated 1100 MPa at ambient temperature and specified behavior at 235°C.
• Standard identification and adoption: CEN reference and national adoption (SIST).

Note: The published extract identifies scope and classification; full standard likely includes dimensional references, marking, mechanical property requirements, and acceptance criteria typical for aerospace fasteners. Refer to the full EN 3303 document for detailed dimensional tables, tolerances, and test methods.

Applications

EN 3303:1997 is intended for use where high-strength, cadmium-plated hexagon-socket cap screws are required in aerospace and related industries. Practical uses include:

• Structural and airframe assemblies where a high-tensile alloy steel screw is specified.
• Maintenance, repair and overhaul (MRO) procedures requiring replacement fasteners that meet aerospace classification.
• Procurement and supplier qualification for aerospace fasteners to ensure material, coating and strength compliance.
• Quality control and inspection protocols referencing standardized classification and marking.

Typical users:

• Aerospace design and structural engineers
• Fastener manufacturers and distributors
• MRO organizations and aircraft maintenance technicians
• Procurement and quality assurance teams in aerospace supply chains

Related Standards

• ICS classification: 49.030.20 – Bolts, screws, studs
• Other EN aerospace fastener specifications and national adoptions (consult CEN and national standards bodies for related part specifications and complementary test standards).

For precise dimensional data, mechanical test methods and inspection criteria, obtain the full EN 3303:1997 / SIST EN 3303:2001 document from the CEN or your national standards body.

Standards Content (Sample)

SLOVENSKI STANDARD
01-januar-2001
Aerospace series - Screw, cap head, hexagon socket, coarse tolerance normal
shank, medium length thread, in alloy steel, cadmium plated - Classification: 1 100
MPa (at ambient temperature)/235°C
Aerospace series - Screw, cap head, hexagon socket, coarse tolerance normal shank,
medium length thread, in alloy steel, cadmium plated - Classification: 1 100 MPa (at
ambient temperature)/235°C
Luft- und Raumfahrt - Zylinderschrauben mit Innensechskant, mittlere Gewindelänge,
aus legiertem Stahl, verkadmet - Klasse: 1 100 MPa (bei Raumtemperatur)/235°C
Série aérospatiale - Vis a tete cylindrique, a six pans creux, tige normale a tolérance
large, filetage moyen, en acier allié, cadmiées - Classification: 1 100 MPa (a température
ambiante)/235°C
Ta slovenski standard je istoveten z: EN 3303:1997
ICS:
49.030
...