SIST EN 2908:2001

• Abstract:

  This standard specifies the characteristics of self-locking bihexagonal nuts with deep counterbore in FE-PA92HT for aerospace applications.

• 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 2908:1994 - Aerospace series - Nuts, bihexagonal, self-locking, deep counterbored, in heat resisting steel FE-PA92HT (A286) - Classification: 1 100 MPa (at ambient temperature) / 650 °C

• Referred By: SIST EN 60027-7:2010 - Letter symbols to be used in electrical technology - Part 7: Power generation, transmission and distribution (IEC 60027-7:2010)
• Effective Date: 09-Feb-2026
• Referred By: SIST EN 60909-0:2016 - Short-circuit currents in three-phase a.c. systems - Part 0: Calculation of currents
• Effective Date: 09-Feb-2026
• Referred By: SIST EN 60909-3:2010 - Short-circuit currents in three-phase a.c systems - Part 3: Currents during two separate simultaneous line-to-earth short-circuits and partial short-circuit currents flowing through earth (IEC 60909-3:2009)
• Effective Date: 09-Feb-2026

SIST EN 2908:2001 is a Slovenian standard published by SIST for aerospace nuts. It specifies self-locking bihexagonal nuts with a deep counterbore made from heat resisting steel FE-PA92HT (A286), classified as 1 100 MPa at ambient temperature and 650 °C. In practice, it is the reference for selecting and identifying this nut type when the application needs the stated material and performance class.

What does SIST EN 2908:2001 specify?

SIST EN 2908:2001 covers the characteristics of self-locking bihexagonal nuts with deep counterbore for aerospace applications. The standard is identified in Slovenian, German, French and English, and it carries ICS 49.030.30 for nuts.

The page also states that the Slovenian standard is identical with EN 2908:1994. That helps users confirm they are working with the European text that this national standard reproduces.

What are the key requirements of SIST EN 2908:2001?

SIST EN 2908:2001 fixes the nut form, the material, and the class designation. For procurement and incoming inspection, those are the points that determine whether a part matches the standard.

• Bihexagonal, self-locking, deep counterbored nuts - The standard is for this specific nut form, so suppliers and engineers need to match the geometry and locking feature to the intended fastener system.
• Heat resisting steel FE-PA92HT (A286) - The nuts are specified in this material, which matters when the joint must retain properties in elevated-temperature aerospace service.
• Classification 1 100 MPa (at ambient temperature) / 650 °C - This designation identifies the nut class at ambient temperature and at 650 °C, which is important when selecting compatible parts for the required load and temperature environment.
• Aerospace application - The scope ties the product to aerospace use, so the standard supports controlled, high-reliability assemblies rather than generic industrial fastening.
• Self-locking function - The locking feature is part of the specification, so assembly teams use nuts that resist loosening without adding a separate locking device.
• Deep counterbore - The recessed form is part of the identification of the nut, and it affects fit, engagement and compatibility with the mating component.

What terms does SIST EN 2908:2001 use?

SIST EN 2908:2001 uses a small set of product and material terms in its title and scope. These are the words that matter when matching the standard to a part, order or inspection record.

• Bihexagonal - A twelve-point nut form that identifies the drive geometry of the part.
• Self-locking - A nut design intended to resist loosening under service conditions.
• Deep counterbored - A nut with a recessed counterbore, which affects fit and seating.
• FE-PA92HT (A286) - The heat resisting steel named for the nut material.
• Classification 1 100 MPa / 650 °C - The designation used in the title to identify the nut class at ambient temperature and at 650 °C.

Who uses SIST EN 2908:2001?

SIST EN 2908:2001 is used by aerospace designers, fastener buyers, manufacturing suppliers, and quality assurance teams. It helps them specify, source, and check a nut type with the right geometry, material and class.

In practice, design engineers use it to call up a defined fastener for aerospace assemblies. Purchasing and supply chain teams use it to order the correct product form and material designation. Quality managers and inspectors use it to verify that delivered nuts match the identified standard before release into assembly.

Which standards are used with SIST EN 2908:2001?

SIST EN 2908:2001 is identified as identical with EN 2908:1994. That is the counterpart standard named on the page and the main reference for anyone comparing the Slovenian edition with the European text.

What does the SIST EN 2908:2001 document contain?

The document presents the standard title in Slovenian, German, French and English, together with the publishing body, date line, ICS 49.030.30 and the equivalence statement with EN 2908:1994. It also states the product family, material and classification in the title itself, so readers can identify the exact aerospace nut standard without reading a long technical body.

It is a compact identification standard focused on one nut type. That makes it useful for specification, ordering, traceability and acceptance checks where the exact fastener designation matters.

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Aerospace series - Nuts, bihexagonal, self-locking, deep counterbored, in heat resisting steel FE-PA92HT (A286) - Classification: 1 100 MPa (at ambient temperature) / 650 °CLuft- und Raumfahrt - Zwölfkantmuttern, selbstsichernd, mit zylindrischer Aussenkung, aus hochwarmfestem Stahl FE-PA92HT (A286) - Klasse: 1 100 MPa (bei Raumtemperatur) / 650 °CSérie aérospatiale - Ecrous bihexagonaux, a freinage interne, chambrés, en acie
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