SIST EN 3227:2010
(Main)Aerospace series - Nuts, hexagonal, plain, normal height, normal across flats, in steel, cadmium plated, left hand thread - Classification: 1100 MPa (at ambient temperature)/235 °C
- Abstract
This standard specifies the characteristics of plain, hexagonal nuts, normal height, normal across flats, with left hand thread, in steel, cadmium plated.
Classification : 1 100 MPa / 235 °C.
- Status
- Published
- Publication Date
- 07-Mar-2010
- Technical Committee
- I13 - Imaginarni 13
- Current Stage
- 6060 - National Implementation/Publication (Adopted Project)
- Start Date
- 01-Mar-2010
- Due Date
- 06-May-2010
- Completion Date
- 08-Mar-2010
SIST EN 3227:2010 is the Slovenian adoption of EN 3227:2010, a European standard for aerospace hexagonal nuts. It specifies plain, normal-height, normal-across-flats nuts in steel with cadmium plating and left hand thread, classified as 1 100 MPa at ambient temperature / 235 °C.
What does SIST EN 3227:2010 specify?
SIST EN 3227:2010 specifies the characteristics of one defined family of aerospace nuts and ties them to a fixed classification, material, finish and thread direction. It is organized into clauses covering scope, normative references, required characteristics, designation, marking and technical specification.
Clause 3 gives the product characteristics. Clause 4 defines how to designate the nut in ordering and documentation. Clause 5 sets the marking system, and Clause 6 points to the procurement and manufacturer-approval framework used for the product.
What are the key requirements of SIST EN 3227:2010?
Geometry and dimensions
SIST EN 3227:2010 requires plain hexagonal nuts with normal height and normal across flats, using a left hand thread. The dimensions and tolerances follow ISO 8279 and apply after surface treatment, while tolerances of form and position follow ISO 8788.
Figure 1 and Table 1 define the geometry, the diameter codes, the thread sizes and the optional lockwire-hole arrangement. In practice, this is the information that design, inspection and purchasing teams use to make sure the nut matches the intended aerospace thread and installation method.
Materials and surface treatment
SIST EN 3227:2010 allows the nut body to be made from the listed steels in EN 2205, EN 2438, EN 3513, EN 2448 or TR 3823. The surface treatment is cadmium plating to EN 2133.
Clause 3.3 requires cadmium plating on threads and on all surfaces that can be contacted by a 20 mm diameter ball, with continuous cadmium plating on the remaining surfaces. In practice, this means the part is not only plated, but plated where assembly, wear and corrosion exposure matter most.
Identification, designation and marking
SIST EN 3227:2010 uses a coded designation system in Clause 4. The designation combines a description block, the standard number, a holes code and a diameter code, and it may also include the originator code I9005 when needed.
Clause 5 links the nut diameter range to the marking style defined in EN 2424. That gives manufacturers and inspectors a common way to identify the part and trace the correct style during production, receiving inspection and spares control.
Technical specification
SIST EN 3227:2010 refers to ISO 9139 for the technical specification, with manufacturer approval handled according to EN 9100. This matters because the nut is not only a dimensional item - it is also a controlled aerospace product that must come from an approved manufacturing and quality system.
What terms does SIST EN 3227:2010 define?
- MJ threads - The aerospace metric thread form used here, with dimensions and limit dimensions taken from the referenced ISO standard.
- Left hand thread - A thread that tightens in the opposite direction to the usual right hand thread, so orientation must be specified and checked.
- Classification 1 100 MPa / 235 °C - The strength and temperature class assigned to the nut, linking it to the performance level and service temperature described in the notes.
- Lockwire holes - An optional feature identified in the designation and drawing details for use where a wired locking arrangement is required.
- Cadmium plated - The required surface finish, used here to provide the specified plated condition on the nut surfaces.
- EN 9100 - The quality management system reference used for manufacturer approval in this standard.
Who uses SIST EN 3227:2010?
SIST EN 3227:2010 is used by aerospace designers, procurement teams, manufacturers, inspectors and quality managers. They use it to specify the nut, select the correct material and surface treatment, check dimensions and tolerances, apply the correct marking, and verify that the supply chain follows the aerospace quality system requirements.
It is relevant anywhere a buyer or engineer needs a controlled left hand threaded aerospace nut with a defined strength and temperature classification.
Which standards are used with SIST EN 3227:2010?
| Standard | What it contributes |
|---|---|
| EN 2133 | Cadmium plating of steels and compatible materials |
| EN 2205 | One permitted steel material condition |
| EN 2424 | Marking of aerospace products |
| EN 2438 | One permitted steel material condition |
| EN 2448 | One permitted steel material condition |
| EN 3513 | One permitted steel material condition |
| EN 9100 | Manufacturer approval framework through aerospace quality management |
| ISO 5855-2 | MJ thread limit dimensions for bolts and nuts |
| ISO 8279 | Nut dimensions |
| ISO 8788 | Tolerances of form and position |
| ISO 9139 | Procurement specification for plain or slotted hexagonal nuts |
| TR 3823 | Materials for plain and slotted hexagonal nuts |
What does the SIST EN 3227:2010 document contain?
SIST EN 3227:2010 contains one figure and three tables that carry the practical product data. Figure 1 shows the nut form and optional features, including the left hand thread identification and lockwire-hole arrangement.
Table 1 gives the diameter codes, corresponding MJ thread designations and approximate mass per 1 000 pieces. Table 2 provides the option code for lockwire holes, and Table 3 gives the marking style linked to the diameter code.
Clause 4 gives an ordering designation example, so the part can be named consistently in procurement and documentation. Clause 6 then connects the product to ISO 9139 and EN 9100 for the technical and approval side of manufacture.
Relations
- Effective Date
- 28-Jan-2026
- Effective Date
- 28-Jan-2026
- Effective Date
- 28-Jan-2026
- Effective Date
- 28-Jan-2026
- Effective Date
- 28-Jan-2026
- Effective Date
- 28-Jan-2026
- Effective Date
- 28-Jan-2026
- Effective Date
- 28-Jan-2026
- Effective Date
- 28-Jan-2026
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Frequently Asked Questions
SIST EN 3227:2010 is a standard published by the Slovenian Institute for Standardization (SIST). Its full title is "Aerospace series - Nuts, hexagonal, plain, normal height, normal across flats, in steel, cadmium plated, left hand thread - Classification: 1100 MPa (at ambient temperature)/235 °C". This standard covers: This standard specifies the characteristics of plain, hexagonal nuts, normal height, normal across flats, with left hand thread, in steel, cadmium plated. Classification : 1 100 MPa / 235 °C.
This standard specifies the characteristics of plain, hexagonal nuts, normal height, normal across flats, with left hand thread, in steel, cadmium plated. Classification : 1 100 MPa / 235 °C.
SIST EN 3227:2010 is classified under the following ICS (International Classification for Standards) categories: 49.030.30 - Nuts. The ICS classification helps identify the subject area and facilitates finding related standards.
SIST EN 3227:2010 has the following relationships with other standards: It is inter standard links to SIST EN 2205:2009, SIST EN 9100:2018, SIST EN 2438:2009, SIST EN 2944:2001, SIST EN 840-6:2004+A1:2008, SIST EN ISO 13786:2017, SIST EN 2424:2008, SIST EN 2133:2021, SIST EN 2448:2009. Understanding these relationships helps ensure you are using the most current and applicable version of the standard.
SIST EN 3227:2010 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.Luft- und Raumfahrt - Sechskantmuttern mit normaler Schlüsselweite, aus Stahl, verkadmet, Linksgewinde - Klasse: 1100 MPa (bei Raumtemperatur)/235 °CSérie aérospatiale - Écrous hexagonaux ordinaires, hauteur normale, surplats normaux, en acier, cadmiés, filetage à gauche - Classification: 1100 MPa (à température ambiante)/235 °CAerospace series - Nuts, hexagonal, plain, normal height, normal across flats, in steel, cadmium plated, left hand thread - Classification: 1100 MPa (at ambient temperature)/235 °C49.030.30MaticeNutsICS:Ta slovenski standard je istoveten z:EN 3227:2010SIST EN 3227:2010en,de01-april-2010SIST EN 3227:2010SLOVENSKI
STANDARD
EUROPEAN STANDARD NORME EUROPÉENNE EUROPÄISCHE NORM
EN 3227
February 2010 ICS 49.030.30 English Version
Aerospace series - Nuts, hexagonal, plain, normal height, normal across flats, in steel, cadmium plated, left hand thread - Classification: 1 100 MPa (at ambient temperature) / 235 °C
Série aérospatiale - Écrous hexagonaux ordinaires, hauteur normale, surplats normaux, en acier, cadmiés, filetage à gauche - Classification : 1 100 MPa (à température ambiante) / 235 °C
Luft- und Raumfahrt - Sechskantmuttern mit normaler Schlüsselweite, aus Stahl, verkadmet, Linksgewinde - Klasse: 1 100 MPa (bei Raumtemperatur) / 235 °C This European Standard was approved by CEN on 11 December 2009.
CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the CEN Management Centre or to any CEN member.
This European Standard exists in three official versions (English, French, German). A version in any other language made by translation under the responsibility of a CEN member into its own language and notified to the CEN Management Centre has the same status as the official versions.
CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.
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