SIST EN ISO 15978:2003

SIST EN ISO 15978:2003 is the Slovenian adoption of EN ISO 15978:2002 for open end blind rivets with break pull mandrel and countersunk head. It specifies the dimensions, mechanical properties, application data, material and finish, and acceptance checks for rivets with an aluminium alloy body and a steel mandrel. In practice, it is used by people who specify, make, supply, inspect, or buy these blind rivets.

What does SIST EN ISO 15978:2003 specify?

SIST EN ISO 15978:2003 specifies open end blind rivets with break pull mandrel and countersunk head, with an aluminium alloy body and a steel mandrel, for nominal diameters from 2.4 mm to 5 mm inclusive. It covers the product’s dimensions, mechanical properties, application data, and the checks used to judge it in use and on receipt.

The document is organized into clauses for scope, normative references, dimensions, material and finish, mechanical properties, mandrel retention behavior, workmanship, acceptance testing, and designation. It also includes an informative annex with design formulae and a normative annex listing the referenced publications used with the standard.

What are the key requirements of SIST EN ISO 15978:2003?

Dimensions and application data

SIST EN ISO 15978:2003 gives the rivet body and mandrel dimensions in its dimensional clause, with a figure and tables for the nominal sizes, blind length, and grip ranges. It also states the clearance hole diameters needed in the parts to be joined. For the user, this means the standard can be used to choose a rivet size and drill the joint correctly so the parts fit and the fastener can be set properly.

The standard also notes that the symbols and designations for dimensions come from ISO 14588. That matters because drawings, specifications, and supplier documents can use the same terms without ambiguity.

Hole size and joint fit

SIST EN ISO 15978:2003 specifies clearance hole diameters for the components to be fastened and warns that non-conforming hole sizes may cause assembly difficulty and reduce shear and tensile performance. It also allows only the access-side component to have a larger hole when alignment needs it, while noting the same performance reduction risk. In practice, the hole size is not just a workshop detail - it directly affects how easily the rivet sets and how much load the joint can carry.

Material and finish

SIST EN ISO 15978:2003 requires an aluminium alloy body and a steel mandrel. The rivet body surface is to be plain, in natural finish, while the mandrel finish is left to the manufacturer and may be oil, phosphate and oil, or zinc coating. This tells buyers what material combination to ask for and what surface appearance to expect.

Mechanical performance

SIST EN ISO 15978:2003 gives two rivet body strength grades, class L and class H, and defines minimum shear loads, minimum tensile loads, and maximum mandrel break loads in Table 3. These values are verified by testing in accordance with ISO 14589. For users, this is the main basis for selecting a rivet that matches the strength needed in the joint.

Mandrel behavior after setting

SIST EN ISO 15978:2003 requires mandrel push-out resistance to exceed 10 N when tested to ISO 14589. It also requires the remaining mandrel portion in the set rivet not to be ejected by the specified head retention test load. This matters where loose mandrel fragments could interfere with service, safety, or appearance.

Workmanship, inspection, and designation

SIST EN ISO 15978:2003 requires rivets to be free from burrs and harmful defects, with well-formed heads and shanks, and no visible cracking after setting at 5× magnification. Acceptance inspection follows ISO 3269 unless otherwise agreed. The designation clause gives the order format for stating the standard, diameter, length, material combination, and class, which helps buyers and suppliers order the same product consistently.

What terms does SIST EN ISO 15978:2003 define?

• Open end blind rivet - A blind rivet with an open body end, used when access is available from only one side of the joint.
• Break pull mandrel - The mandrel designed to break during setting after the rivet body has been formed.
• Countersunk head - A head shape intended to sit in a countersunk hole so the head can finish flush or nearly flush with the surface.
• AIA - The aluminium alloy body material identified by the standard.
• St - The steel mandrel material identified by the standard.
• Grip range - The range of joint thicknesses that a rivet size can clamp effectively.
• Mandrel break load - The load at which the mandrel is intended to break during setting.
• Clearance hole diameter - The hole size required in the joined parts so the rivet can pass through and be installed.

Who uses SIST EN ISO 15978:2003?

Manufacturers of blind rivets use SIST EN ISO 15978:2003 to design the product and confirm dimensions and test performance. Fastener suppliers and buyers use it to specify the right diameter, length, class, and material combination on orders and drawings.

Quality managers and inspection teams use it for acceptance inspection, dimensional checks, and workpiece conformance review. Assemblers and sheet metal fabricators use it to choose the correct clearance hole, grip range, and setting behavior for the joint they are making.

Which standards are used with SIST EN ISO 15978:2003?

• ISO 3269:2000 - Provides acceptance inspection for fasteners.
• ISO 14588:2000 - Provides terminology and definitions for blind rivets, including the symbols and designations used for dimensions.
• ISO 14589:2000 - Provides the mechanical testing method used for the shear, tensile, mandrel break, push-out, and head retention checks.

What does the SIST EN ISO 15978:2003 document contain?

The document contains a dimensioned figure of the rivet, tables for rivet dimensions and recommended grip ranges, and a table of clearance hole diameters. It also contains the mechanical property table for class L and class H, plus the head retention test loads by nominal diameter.

Annex A gives design formulae and tolerances for shank diameter, head diameter, head height, and clearance hole diameter. Annex ZA lists the referenced international publications and their relevant European publications. These parts are mainly used when designing the fastener, specifying it in procurement documents, or checking it during testing and acceptance.