CFS Blind Fasteners & Rivets 2

Question 1

A 'Rivnut' (threaded insert or nutsert) is classified as a blind fastener because:

Accepted Answer

It is installed by pulling a threaded mandrel that deforms the insert body from one side, creating a nut thread

Answer

A threaded insert (Rivnut/nutsert) is set by rotating and pulling a mandrel that collapses the insert body to grip the back of the panel, creating a reusable threaded hole from one side.

Question 2

According to IFI and industry standards, a blind rivet's nominal diameter is measured:

Accepted Answer

By the body (shank) outer diameter before installation

Answer

The nominal diameter of a blind rivet refers to the outer diameter of the unset rivet body (shank), which corresponds to the drill size used for hole preparation.

Question 3

What failure mode is most likely when a blind rivet is installed in a joint that exceeds the rivet's maximum grip range?

Accepted Answer

The rivet body will not fully collapse, leaving the joint under-clamped with a loose mandrel stub

Answer

When the material stack exceeds the maximum grip, the rivet body does not deform enough to clamp the joint properly, resulting in a loose connection and a protruding or improperly broken mandrel.

Question 4

Which military or aerospace specification is commonly referenced for solid (non-blind) aluminum aircraft rivets, providing a baseline to which blind rivet specifications are often compared?

Accepted Answer

MS 20470 (AN470)

Answer

MS 20470 (also known as AN470) covers the universal head solid aluminum aircraft rivet that is a foundational standard in aerospace fastening, distinguishing it from blind rivet specs.

Question 5

A 'drive rivet' (or hammer-set rivet) differs from a pull-type blind rivet in that it is set by:

Accepted Answer

Driving a pin into the rivet body with a hammer or press, expanding the blind end

Answer

Drive rivets are set by hammering or pressing a pre-installed pin into the rivet body, causing the blind end to splay and clamp the joint without needing a pull-type tool.

(CFS) Certified Fastener Specialist Practice Test

(CFS) Certified Fastener Specialist Practice Test

CFS Blind Fasteners & Rivets 2