E - Materials and Fastening Devices Flashcards
Ferrous metals are metals that:
Have an iron base.
True or False: Threads for cast iron are usually a course thread.
True
Which of the following has the lowest melting point? Aluminum, brass, copper, or lead.
Lead
What is elasticity?
Elasticity is the ability of a material to be stretched and still return to its original shape.
When steel is heated to a high temperature and cooled slowly, the metal will be:
In a softened state, easy to work.
Vulcanizing rubber refers to:
Heating raw rubber with sulphur to alter its properties.
What is the health hazard when working with asbestos and fibreglass?
Both are hazardous when inhaled.
Which of the items listed below would be best to form a gasket? Gasket sealant, fibreglass, thread locker, or silicone.
Silicone.
True or False: Nylons are being used in industry as a replacement for metal.
True.
A cap screw with a thread pitch of 1/24 in ch has:
24 threads per inch.
Thread series refers to the:
Type of thread: UNC, UNF, UNEF or NPT.
Explain by short answer or sentence form, how tensile strength is indicated on imperial and metric fasteners.
Imperial fasteners have lines. The number of lines plus two is the tensile strength. Metric fasteners have numbers indicating their class: 4.8, 8.8, 10.9.
What do the numbers 10-24 refer to in regards to machine screws?
10 indicates the diameter or size; 24 indicates the number of threads per inch.
Lock washers are Not suitable for use with which of the following?
Aluminum.
A fastener with six radial marks on the head has a tensile strength of:
Eight.
A fastener has resistance going into a threaded hole. This resistance to turning is called:
Run down torque and must be added on to the full torque.
What is another name for a Woodruff key?
A half moon key.
Besides securing and driving components, what other function is performed by a helical spline? Explain in one sentence.
A helical spline offsets end or axial thrust.
Applying a lubricant to the threads of a fastener and using a dry torque specification will:
Increase the clamp load compared to dry threads.
Split and roll pins should be installed with what kind of tool? Explain in one sentence.
Use a roll pin punch for the size of pin.
Set screws use the same sizing standards as:
Machine screws.
True or False: Aerobic sealers are those that require air to enable them to cure.
True.
Explain the function of a snap ring.
Snap rings are placed within a groove on a shaft or housing and provide a surface against which a component may ride.
If a fastener with thread locker or locktite is difficult to remove, you should:
Apply heat.
