SIST EN 3848:2002

• Abstract:

  This standard specifies the methods of measuring deviations from the nominal form of semi-finished metallic products for aerospace applications.; This standard does not apply to:; - extruded sections: see EN 2066;; - folded sections: see EN 2065

• Status: Published
• Publication Date: 31-Dec-2001
• ICS: 49.035 - Components for aerospace construction
• Technical Committee: SS SPL - Technical Board for the general field
• Current Stage: 6060 - National Implementation/Publication (Adopted Project)
• Start Date: 01-Jan-2002
• Due Date: 01-Jan-2002
• Completion Date: 01-Jan-2002
• Ref Project: EN 3848:2001 - Aerospace series - Semi-finished metallic products - Methods of measuring form deviations

• Refers: SIST EN 2066:2004 - Aerospace series - Extruded section in aluminium alloys - General tolerances
• Effective Date: 28-Jan-2026
• Refers: SIST EN 13531:2002 - Earth-moving machinery - Tip-over protection structure (TOPS) for compact excavators - Laboratory tests and performance requirements (ISO 12117:1997 modified)
• Effective Date: 28-Jan-2026
• Referred By: SIST EN 6025:2021 - Aerospace series - Plates - Aluminium alloy 2024 - Close tolerance flatness - Thickness - 6 mm ≤ a ≤ 55 mm - Dimensions
• Effective Date: 28-Jan-2026
• Referred By: SIST EN 2131:2004 - Aerospace series - Plates in aluminium alloys - Thickness 6 mm < a < 160 mm - Dimensions
• Effective Date: 28-Jan-2026
• Referred By: SIST EN 2339:2002 - Aerospace series - Sheets, cold rolled in titanium and titanium alloys - Thickness 0,2 mm < = a < = 6 mm - Dimensions
• Effective Date: 28-Jan-2026
• Referred By: SIST EN 2045:2004 - Aerospace series - Square bars, drawn in aluminium and aluminium alloys - Tolerance class h 11 - Thickness 6 mm < a < 50 mm - Dimensions
• Effective Date: 28-Jan-2026
• Referred By: SIST EN 4180:2004 - Aerospace series - Circular tubes, for fluids in titanium and titanium alloys - Wide tolerances - Diameter 4 mm < D < 40 mm - Dimensions
• Effective Date: 28-Jan-2026
• Referred By: SIST EN 2344:2002 - Aerospace series - Round bars, machined in heat resisting alloys - Diameter 10 mm < = D < = 180 mm - Dimensions
• Effective Date: 28-Jan-2026
• Referred By: SIST EN 2338:2002 - Aerospace series - Sheets, hot rolled in titanium and titanium alloys - Thickness 0,8 mm < = a < = 6 mm - Dimensions
• Effective Date: 28-Jan-2026
• Referred By: SIST EN 3145:2004 - Aerospace series - Round bars, hot rolled in steel - Normal tolerances - Diameter 6 mm < D < 250 mm - Dimensions
• Effective Date: 28-Jan-2026
• Referred By: SIST EN 2044:2004 - Aerospace series - Round bars, drawn, in aluminium and aluminium alloys - Tolerance class h 11 - Diameter 4 mm < D < 63 mm - Dimensions
• Effective Date: 28-Jan-2026
• Referred By: SIST EN 2071:2004 - Aerospace series - Sheets in aluminium and aluminium alloys - Thickness 0,25 mm < a < 6 mm - Dimensions
• Effective Date: 28-Jan-2026
• Referred By: SIST EN 3842:2002 - Aerospace series - Circular tubes for fluids in corrosion resistant steel - Diameter 3,2 mm < = D < = 100 mm - Thickness 0,32 mm < = a < = 2,5 mm - Dimensions
• Effective Date: 28-Jan-2026
• Referred By: SIST EN 2622:2002 - Aerospace series - Circular tubes, for fluids in heat resisting alloys-Diameter 3,2 mm < = D < = 100 mm - Dimensions
• Effective Date: 28-Jan-2026
• Referred By: SIST EN 2589:2017 - Aerospace series - Steel - Sheet and strip, cold rolled - Thickness 0,1 mm ≤ a ≤ 3 mm - Dimensions
• Effective Date: 28-Jan-2026

SIST EN 3848:2002 is the Slovenian adoption of EN 3848:2001, published by SIST for aerospace applications. It specifies methods for measuring deviations from the nominal form of semi-finished metallic products, so manufacturers and inspectors can check shape-related features in a consistent way. The document is about measurement methods, not product tolerances themselves.

What does SIST EN 3848:2002 specify?

SIST EN 3848:2002 specifies how to measure form deviations on semi-finished metallic products used in aerospace work. It applies to sheet, plate, round bar, hexagonal bar, square and rectangular bar, and circular tube, and it points extruded sections and folded sections to other standards.

The document is organized into these main clauses:

Clause	Covers
1	Scope
2	Normative references
3	Measuring condition
4	Sheet and plate
5	Round bar
6	Hexagonal bar
7	Square and rectangular bar
8	Circular tube

In practice, this means the standard tells users how to set up the measurement and what geometric feature to check for each product form.

What are the key requirements of SIST EN 3848:2002?

General measuring conditions

SIST EN 3848:2002 requires measuring instruments to be accurate enough for the dimensions and tolerances being checked. It also requires measurements to be made at workshop or laboratory ambient temperature, with disputed measurements taken between 15 °C and 25 °C.

For form-deviation checks, surface plates must be flat to within 1% of the product form deviation being measured. That matters because the reference surface must be more accurate than the defect being judged.

Sheet and plate

For sheet and plate, Clause 4.1 measures squareness by comparing the lengths of the two diagonals. Clause 4.2 measures lateral curvature with the product resting on a horizontal surface plate.

Clause 4.3 uses the ISO 1101 flatness tolerance zone, defined by two parallel planes a distance t apart. Deviation from flatness caused by arching, buckling or edge waves is measured with a lightweight straight-edge and a feeler gauge, dial gauge or scale, with the concave side up unless the product size prevents that. In practice, the user is checking whether the whole area stays within the allowed shape envelope.

Bars and tubes

For round bar, hexagonal bar, square and rectangular bar, and circular tube, straightness is checked over the total length or over a specified length as given in the dimensional standard. The part is placed on a surface plate so its own mass minimizes the deviation being measured.

This is important because straightness is not judged in free air but in a controlled resting position. It gives comparable results between shops and test laboratories.

Other product-specific checks

For round bar, Clause 5.2 measures roundness as the difference between the maximum and minimum diameters at the same cross-section. For circular tube, Clause 8.2 uses the same idea on outside diameter, and Clause 8.3 measures eccentricity as half the difference between the maximum and minimum wall thickness.

For hexagonal bar, Clause 6.2 measures twist as the maximum distance between the bottom surface of the bar and the surface plate. Clause 6.3 checks surface flatness on all faces. For square and rectangular bar, Clause 7 also covers twist, squareness and surface flatness on all faces.

What terms does SIST EN 3848:2002 define?

• Flatness tolerance zone - the space between two parallel planes a distance t apart, which sets the acceptable limit for flatness.
• Squareness - the deviation found from the difference between diagonal lengths, used to judge whether the shape is truly rectangular.
• Lateral curvature - the bowing of a sheet or plate across its length when placed on a horizontal surface plate.
• Straightness deviation (Y1, Y2) - departure from straightness measured over the total length X1 or over a specified length X2.
• Twist (v) - the maximum gap between the underside of a bar and the surface plate along the measuring length.
• Roundness - the difference between the largest and smallest diameter at the same cross-section.
• Eccentricity (t) - half the difference between the maximum and minimum wall thickness of a tube.

Who uses SIST EN 3848:2002?

SIST EN 3848:2002 is used by aerospace material suppliers, inspection staff, quality teams and test laboratories. It is also useful for buyers and receiving inspectors who need a common method for checking whether semi-finished metallic products match the required shape condition. In practice, it supports incoming inspection, production checks and dispute measurements.

Which standards are used with SIST EN 3848:2002?

• EN 2065, Folded profiles - Aluminium alloys - General tolerances - Aerospace series - used for folded sections, which are outside this standard’s scope.
• EN 2066, Aerospace series - Extruded sections in aluminium alloys - General tolerances - used for extruded sections, which are outside this standard’s scope.
• ISO 1101, Technical drawings, geometrical tolerancing; tolerances of form, orientation, location and runout; generalities, definitions, symbols of drawings - supplies the flatness-tolerance concepts referenced in Clause 4.3.

What does the SIST EN 3848:2002 document contain?

SIST EN 3848:2002 contains the measurement conditions and product-specific methods for judging form deviations on aerospace semi-finished metallic products. It includes figure-based measurement set-ups for sheet and plate, straightness checks for bars and tubes, and geometry checks for twist, roundness, squareness, surface flatness and eccentricity. The figures show how to place the product on a surface plate and where to measure the deviation.

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Aerospace series - Semi-finished metallic products - Methods of measuring form deviationsLuft- und Raumfahrt - Metallisches Halbzeug - Messverfahren für FormabweichungenSérie aérospatiale - Demi-produits métalliques - Méthodes de mesure des défauts de formeAerospace series - Semi-finished metallic products - Methods of measuring form deviations49.035Sestavni deli za letalsko in vesoljsko gradnjoComponents for aerospace constructionICS:Ta slovenski standard je istoveten z:EN 3848:2001SIST EN 3848:2002en01-januar-2002SIST EN 3848:2002SLOVENSKI
STANDARD
EUROPEAN STANDARDNORME EUROPÉENNEEUROPÄISCHE NORMEN 3848September 2001ICS 49.035English versionAerospace series - Semi-finished metallic products - Methods ofmeasuring form deviationsSérie aérospatiale - Demi-produits métalliques - Méthodesde measure des défauts de formeLuft- und Raumfahrt - Metallisches Halbzeug -Meßverfahren für FormabweichungenThis European Standard was approved by CEN on 2 May 2001.CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this EuropeanStandard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such nationalstandards may be obtained on application to the 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 translationunder the responsibility of a CEN member into its own language and notified to the Management Centre has the same status as the officialversions.CEN members are the national standards bodies of Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece,Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom.EUROPEAN COMMITTEE FOR STANDARDIZATIONCOMITÉ EUROPÉEN DE NORMALISATIONEUROPÄISCHES KOMITEE FÜR NORMUNGManagement Centre: rue de Stassart, 36
B-1050 Brussels© 2001 CENAll rights of exploitation in any form and by any means reservedworldwide for CEN national Members.Ref. No. EN 3848:2001 ESIST EN 3848:2002

1 % of the requisiteproduct form deviation being measured.4Sheet and plate4.1SquarenessThe squareness deviation shall be measured as the difference in length of diagonals AA and BB as shown infigure 1.4.2Lateral curvatureThe la
...