Threaded Fasteners, Bolts, Nuts, and Washers Flashcards
When using a nut, the grade or hardness does not matter as long as it is the proper size for the bolt.
A) True
B) False
B) False
Transverse loading is the cycle fatigue on a bolt over time with forces not only applied in the typical straight-on directions, but especially in the sideways or perpendicular direction.
A) True
B) False
A) True
Thread stripping occurs suddenly and can lead to a defective product entering service.
A) True
B) False
B) False
The primary purpose of using left-hand threads is to increase the tensile strength of the fastener.
A) True
B) False
B) False
Using a lock washer with internal tooth increases the coefficient of friction between the nut and the joint surface.
A) True
B) False
A) True
What sets Belleville washers apart from other washers?
A) Their unique conical shape
B) Their ability to absorb heat
C) Their color variations
D) Their ability to conduct electricity
A) Their unique conical shape
What was the Belleville washer used for after originally being designed for use with artillery shells?
A) To support pistons and cylinders in the automotive industry
B) To function as household washers for plumbing
C) To serve as spacers in electronic devices
D) To act as decorative elements in jewelry
A) To support pistons and cylinders in the automotive industry
How do Belleville washers contribute to safety in various industires?
A) By providing illumination in dark environments
B) By enhancing clamping force and preventing failure under tension
C) By increasing noise levels in work environments
D) By adding decorative elements to machinery
B) By enhancing clamping force and preventing failure under tension
What precautions should be taken when installing Belleville washers?
A) Ensuring there are gaps between washers
B) Applying excessive force during installation
C) Checking for damage after installation
D) Using mismatched washers
C) Checking for damage after installation
The length of a bolt is determined by measuring its overall length.
A) True
B) False
B) False
A UNC fastener has fewer threads per inch than the same size UNF fastener.
A) True
B) False
A) True
Metric fasteners are commonly used throughout the world. The most common metric fastener is the fine thread.
A) True
B) False
B) False
An SAE bolt grade is an indicator of ___. (Choose all that apply)
A) hardness
B) strength
C) weight
D) length
A and B
The ___ is a national testing organization responsible for rating very high-grade bolts.
A) American Society of Testing and Materials (ASTM)
B) American Standards for Testing Materials (ASTM)
C) International Society for Testing Materials (ISTM)
D) National Electrical Testing Association (NETA)
A) American Society of Testing and Materials (ASTM)
1An ISO bolt thread size is determined by measuring the ___?
A. distance in inches from crest to root of the bolt
B. mm from crest to crest
C. mm per flank
D. threads per inch
B. mm from crest to crest
What is shear force?
A. A force applied diagonally to the long axis of a bolt
B. A force applied parallel to the long axis of a bolt
C. A force applied perpendicular to the long axis of a bolt
D. A force applied tangentially to the long axis of a bolt
C. A force applied perpendicular to the long axis of a bolt
Belleville washers are primarily used for decorative purposes in machinery.
A) True
B) False
B) False
What tools are needed for properly installing Belleville washers?
A. A hammer and nails
B. A torque wrench and nuts and bolts
C. Glue and clamps
D. Scissors and tape
B. A torque wrench and nuts and bolts
If a bolt has three hash marks on the head, it is what grade of bolt?
A. Grade 3
B. Grade 5
C. Grade 6
D. Metric
B. Grade 5
Match the following Belleville washer installation steps with their corresponding descriptions.
I) Ensures washers are securely positioned without damage.
II) Prevents any shifting of washers when under tension.
III) Verifies the strength and integrity of the installation.
A) Step 1: Checking for damage
B) Step 2: Placing washers on a steady surface
C) Step 3: Using a torque wrench for testing
I - A
II - B
III - C
Currently, the UTS standard specifies a ___ flank on all threads today.
A. 55°
B. 57°
C. 60°
D. 63°
C. 60°
Metric bolts are marked on the head with the ___.
A) property class
B) size in mm
C) strength grade
D) they are not marked
A) property class
One of the downsides of ___ threads is the susceptibility to galling.
A. coarse
B. fine
C. left-handed
D. metric
B. fine
A 5/16 - 24 fastener pitch is an example of what thread type?
A. Coarse (UNC)
B. Fine (UNF)
C. Grade 8
D. Metric
B. Fine (UNF)
The shear force is the ___ working against a bolt in a perpendicular direction. Typically the shear strength of a steel fastener is about 0.6 times the tensile strength.
A. lateral
B. pressure
C. strength
D. yield
B. pressure
Match the type of fastener with its description.
I) Bolt designed for easy identification due to its hexagonal head.
II) Bolt with a rounded head and square shank, used with a nut.
III) Bolt with finer threads, offering higher strength in tension.
IV) High-strength bolt commonly used in structural applications.
A) Grade 8 hex bolt
B) Grade 5 fine thread hex bolt
C) Hex bolt
D) Carriage bolt
I - C
II - D
III - B
IV - A
Belleville washers should be installed with their domed sides facing downwards.
A) True
B) False
B) False
How do Belleville washers enhance clamping force?
A. By increasing spacing
B. By increasing weight
C. By providing a spring like effect due to their conical shape
D. By providing additional support
C. By providing a spring like effect due to their conical shape
