SIST EN 2752:2001

Aerospace series - Nuts, anchor, self locking fixed, two lug, reduced series, with counterbore - Classification : 1100 MPa/235 degree C

This standard specifies the characteristics of self locking, two lug, fixed, reduced series anchor nuts, with counterbore.

Luft- und Raumfahrt - Annietmuttern, selbstsichernd, beiderseitiger verkürzter Flansch mit zylindrischer Aussenkung - Klasse : 1100 MPa/235 Grad C

Série aérospatiale - Ecrous a river a freinage interne fixes, a double patte, série réduite avec chambrage - Classification : 1100 MPa/235 degré C

Aerospace series - Nuts, anchor, self locking fixed, two lug, reduced series, with counterbore - Classification : 1100 MPa/235 degree C

General Information

• Status: Published
• Publication Date: 31-Dec-2000
• ICS: 49.030.30 - Nuts
• 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 2752:1989 - Aerospace series - Nuts, anchor, self locking fixed, two lug, reduced series, with counterbore - Classification : 1100 MPa/235 degree C

Overview

EN 2752:1989 is an aerospace-series standard that defines the characteristics of anchor nuts described as self-locking, two-lug, fixed, reduced series with counterbore and classified for 1100 MPa / 235 °C performance. Published by CEN, this standard provides the specification framework for this specific style of aerospace nut used where secure, vibration-resistant fastening is required together with elevated-temperature capability.

Key topics and requirements

The standard focuses on the essential characteristics of the part. Key technical topics covered include:

• Product description and designation - clear identification of the two-lug, self-locking anchor nut geometry in the reduced series with a counterbore.
• Mechanical classification - defined performance class: 1100 MPa / 235 °C, indicating the design tensile/strength and elevated-temperature suitability.
• Functional features - requirements for the self-locking mechanism and the two-lug (ear) configuration for location and load transfer.
• Dimensional and form characteristics - nominal geometry and counterbore features for correct mating and installation (standard specifies the required characteristics rather than proprietary sizes).
• Manufacturing and material considerations - scope implies compatibility with aerospace materials and processes suited to the stated classification.
• Testing, inspection and marking - criteria to verify locking performance, mechanical strength, temperature resistance and traceability are addressed in the standard framework.

Note: The original document text supplied sets out the characteristics covered; for exact dimensions, tolerances, test methods and material calls, consult the full EN 2752:1989 document or its national adoption.

Applications

EN 2752 anchor nuts are used in aerospace assembly where reliable, permanent or fixed nut attachment is required, including:

• Aircraft structural assemblies and airframe panels
• Engine and accessory mountings requiring elevated-temperature resistance
• Equipment racks and avionics mounting where vibration and locking security are critical

Typical users:

• Aerospace fastener manufacturers and designers
• Aircraft structural engineers and detailers
• Procurement and quality assurance teams specifying compliance with aerospace standards
• Maintenance, repair and overhaul (MRO) facilities ensuring correct replacement parts

Related standards

EN 2752 is part of the broader family of aerospace fastener specifications. Related documents typically include other EN and ISO standards for nuts, bolts, material specifications, heat/temperature testing and locking devices. For procurement or compliance, cross-reference applicable national adoptions and later revisions or replacements.

Keywords: EN 2752, anchor nuts, self locking, two lug, reduced series, counterbore, aerospace nuts, 1100 MPa, 235 °C.

Standards Content (Sample)

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Aerospace series - Nuts, anchor, self locking fixed, two lug, reduced series, with counterbore - Classification : 1100 MPa/235 degree CLuft- und Raumfahrt - Annietmuttern, selbstsichernd, beiderseitiger verkürzter Flansch mit zylindrischer Aussenkung - Klasse : 1100 MPa/235 Grad CSérie aérospatiale - Ecrous a river a freinage interne fixes, a double patte, s
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