CFS Fastener Testing & Quality Control 2

Question 1

Which ASTM standard governs proof load testing for inch-series bolts?

Accepted Answer

ASTM F606

Answer

ASTM F606 specifies mechanical test methods for externally and internally threaded fasteners, including proof load testing.

Question 2

A fastener fails a wedge tensile test but passes a standard axial tensile test. What does this indicate?

Accepted Answer

The material has low ductility under combined loading

Answer

Wedge tensile testing evaluates a fastener's ability to sustain combined tensile and bending loads; failure indicates insufficient ductility under such conditions.

Question 3

What is the purpose of a Rockwell hardness test on a fastener?

Accepted Answer

To verify heat treatment and estimate tensile strength

Answer

Rockwell hardness correlates with tensile strength and confirms that heat treatment achieved the required mechanical properties.

Question 4

Which sampling plan standard is most commonly referenced for fastener incoming inspection in the US?

Accepted Answer

ANSI/ASQ Z1.4

Answer

ANSI/ASQ Z1.4 provides attribute sampling procedures widely used for lot-by-lot inspection of fasteners.

Question 5

What does a hydrogen embrittlement relief bake accomplish after electroplating?

Accepted Answer

Drives absorbed hydrogen out of the base metal

Answer

The bake at temperatures typically around 375°F–450°F for several hours allows hydrogen to diffuse out before it can cause delayed fracture.

(CFS) Certified Fastener Specialist Practice Test

(CFS) Certified Fastener Specialist Practice Test

CFS Fastener Testing & Quality Control 2