Podcast
Questions and Answers
What is the term for the top surface joining two sides of a thread in a screw?
What is the term for the top surface joining two sides of a thread in a screw?
- Pitch
- Crest (correct)
- Top Land
- Top Flank
Which type of screw thread projects from a cylindrical surface?
Which type of screw thread projects from a cylindrical surface?
- Straight Thread (correct)
- Thread Shear
- Thread Series
- Taper Thread
What is the name for the conical surface at the starting end of a thread?
What is the name for the conical surface at the starting end of a thread?
- Chamfer (correct)
- Crest
- Pitch Cone
- Flute
What is the name for the surface that connects the crest and root of a screw thread?
What is the name for the surface that connects the crest and root of a screw thread?
What term defines the theoretical profile of a thread for a one-pitch length in the axial plane, used for external thread designs?
What term defines the theoretical profile of a thread for a one-pitch length in the axial plane, used for external thread designs?
In the context of threads, what is the equivalent of top and bottom land in gears?
In the context of threads, what is the equivalent of top and bottom land in gears?
If an experienced mechanic is trying to ease a bolt due to nut lightening, approximately how much could they bread it?
If an experienced mechanic is trying to ease a bolt due to nut lightening, approximately how much could they bread it?
What angle is included between the sides of a thread, measured in an axial plane, in a screw thread?
What angle is included between the sides of a thread, measured in an axial plane, in a screw thread?
What term describes the axial length of contact between two mating parts in a screw and nut?
What term describes the axial length of contact between two mating parts in a screw and nut?
In reference to threads, what are major and minor diameters commonly used to define?
In reference to threads, what are major and minor diameters commonly used to define?
What does the nominal diameter of bolts refer to?
What does the nominal diameter of bolts refer to?
Which kind of thread has an approximately equal width for the thread and the space between threads?
Which kind of thread has an approximately equal width for the thread and the space between threads?
Which kind of thread is most generally used?
Which kind of thread is most generally used?
What type of bolt is commonly used in construction that is threaded on both ends?
What type of bolt is commonly used in construction that is threaded on both ends?
Which hand tool is specifically used to measure tension in bolts?
Which hand tool is specifically used to measure tension in bolts?
Which of the following is NOT a type of tap used for cutting threads in holes?
Which of the following is NOT a type of tap used for cutting threads in holes?
What type of bolt is designed for use in bolting wooden parts together, featuring a round head and a shank designed to prevent turning in the wood?
What type of bolt is designed for use in bolting wooden parts together, featuring a round head and a shank designed to prevent turning in the wood?
What describes a cylindrical bar of steel with threads formed around it, featuring grooves or flutes running lengthwise to create cutting edges for internal threads?
What describes a cylindrical bar of steel with threads formed around it, featuring grooves or flutes running lengthwise to create cutting edges for internal threads?
Which type of bolt has no head but instead features threads on both ends?
Which type of bolt has no head but instead features threads on both ends?
What does the term referring to the diameter of the imaginary cylinder that bounds the crest of an external thread?
What does the term referring to the diameter of the imaginary cylinder that bounds the crest of an external thread?
Flashcards
What is Top Land?
What is Top Land?
Top surface joining two sides of thread.
What is Chamfer?
What is Chamfer?
Conical surface at the starting end of the thread.
What is Flank?
What is Flank?
Surface connecting the crest and root of the screw thread.
What is Angle of thread?
What is Angle of thread?
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What is Length of engagement?
What is Length of engagement?
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What is Major diameter?
What is Major diameter?
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What is Square thread?
What is Square thread?
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What is Stud Bolt?
What is Stud Bolt?
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What is Torque wrench?
What is Torque wrench?
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What is Tap?
What is Tap?
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What is Lead?
What is Lead?
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What is Lock nuts?
What is Lock nuts?
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What is Major diameter?
What is Major diameter?
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What is Bolt?
What is Bolt?
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What is Screw?
What is Screw?
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What is Coupling Bolt?
What is Coupling Bolt?
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What is Join components?
What is Join components?
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What is Nut?
What is Nut?
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What is Coarse threads?
What is Coarse threads?
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What is Threaded section?
What is Threaded section?
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Study Notes
- The top surface joining two sides of a screw thread is known as the crest.
- A screw thread projecting from a cylindrical surface is a straight thread.
- The conical surface at the starting end of a thread is called a chamfer.
- The surface connecting the crest and root of a screw thread is the flank.
- The theoretical thread profile for a length of one pitch in the axial plane, on which external thread designs are based, is the basic thread profile.
- The top and bottom lands for gears are similarly formed to the crest and top land for screw threads.
- Experiments showed that an experienced mechanic could break a 3/8 inch bolt due to nut tightening.
- The angle included between the sides of a thread measured in an axial plane is the angle of the thread.
- The length of contact between mating parts in a screw and nut, measured axially, is the length of engagement.
- Major and minor diameters are commonly used in screw threads.
- The nominal diameter of bolts is the major diameter.
- A square thread has approximately equal thread width and space between threads.
- A UNF (Unified National Fine) thread is generally used.
- A stud bolt is commonly used in construction and is threaded on both ends.
- A torque wrench measures tension in bolts.
- A taper tap is not used for cutting threads in holes.
- A carriage bolt is designed for bolting wooden parts together or wood to metal, featuring a short shank portion under a round head to prevent turning when tightening the nut.
- A tap is a cylindrical bar of steel with threads and lengthwise grooves or flutes, intersecting with threads to form cutting edges, used for cutting internal threads.
- A stud bolt has no head and is threaded on both ends.
- The major diameter refers to the diameter of the imaginary cylinder that bounds the crest of an external thread.
- Pitch is the distance in inches that a screw thread advances axially in one turn.
- UNC (Unified National Coarse) threads are recommended for general use.
- UNF threads are frequently used in automotive and aircraft work.
- UNEF threads are useful in aeronautical equipment.
- 8UN threads are used on bolts for high-pressure pipe flanges and cylinder head studs.
- A bolt refers to a screw fastening with a nut.
- A screw has no nut and turns into a threaded hole.
- A machine bolt is an old name for an unfinished through bolt with a square head.
- A machine bolt is finished all over and typically has coarse threads.
- A carriage bolt has a short portion of shank underneath the head, being square or finned or ribbed.
- A coupling bolt is a type of bolt threaded on both ends for use where a through bolt is impossible.
- A stove bolt is a cheap variety of bolt made in small sizes.
- A lag screw is a large wood screw used to fasten machinery and equipment to a wooden base.
- The length of contact in a tapped hole should be a minimum of about 1.2D for cast iron.
- When the location of a bolt would normally be in shear, using dowel pins is better practice.
- A lock washer maintains pressure between the threads of the bolt and nut.
- The major diameter is the same as the crest diameter of a screw thread.
- A turnbuckle has left-hand threads on one end and right-hand threads on the other end.
- A washer's diameter is generally slightly more than the bolt diameter.
- Stress concentration is maximum at the root in a standard course.
- An elastic nut has one small nut tightened over a main nut, with the main nut tightened against the smaller one, creating friction jamming.
- Foundation bolts should have a pipe sleeve with an inside diameter at least twice the anchor bolt diameter.
- Foundation bolts should be at least 12 times the diameter of the anchor bolt.
- No foundation bolts should be less than 10 mm in diameter.
- Anchor bolts should be embedded in concrete at least 10 times the bolt diameter.
- The acme thread is used for transmission of motion.
- Bench vises usually have acme threads.
- A fastener is any device that connects or joints more components.
- When threads are of opposite hand, the driven screw moves rapidly and is known as a differential screw.
- The threaded length is about 1.5 times the diameter.
- The primary function of a bolt is to join components.
- A screw, unlike a bolt, is self-threading.
- A nut secures a bolt, distributes the load, and prevents vibration.
- A washer distributes the load.
- A hexagonal bolt head is best for applications requiring high torque.
- A screw with a Phillips head has a cross-shaped slot.
- Thread pitch is the distance between adjacent threads.
- Thread lead is equal to the pitch in single-start threads.
- Coarse threads are generally preferred for applications requiring frequent assembly/disassembly.
- A tapped hole has internal threads.
- Tensile strength is the most important material property for bolt selection.
- High temperatures generally decrease bolt strength.
- Steel is a common material for high-strength bolts.
- Corrosion can lead to bolt failure.
- Application requirements are the primary consideration when selecting a bolt material.
- Tensile stress in a bolt is primarily caused by axial loads.
- Shear stress in a bolt is primarily caused by transverse loads.
- Preload in a bolted joint refers to the initial tension in the bolt.
- Higher preload generally increases joint strength.
- Preload is directly related to clamping force.
- Clamping force is directly related to preload.
- Clamping force can be calculated using both theoretical and experimental methods.
- Fatigue failure is a common type of bolt failure.
- The factor of safety in bolt design accounts for material imperfections, load uncertainties, and manufacturing tolerances.
- Stress concentration in a bolt is most likely to occur in the threaded section.
- Fatigue strength is crucial in applications with cyclic loads.
- A lap joint is characterized by overlapping components.
- To withstand tensile loading, a bolted joint should primarily resist axial forces.
- To withstand shear loading, a bolted joint should primarily resist shear forces.
- Preventing bolt loosening can be achieved by using lock washers, locknuts, or thread locker.
- A locknut prevents loosening.
- A cotter pin secures a nut, increases preload, and prevents rotation.
- Proper torque is crucial for achieving desired preload, preventing bolt failure, and ensuring joint integrity.
- Improper torque can cause premature bolt failure, joint loosening, and insufficient clamping force.
- Thermal expansion in bolted joints can cause joint loosening and bolt failure.
- Vibration in bolted joints can cause premature bolt failure, joint loosening, and reduced clamping force.
- A stud has threads on both ends.
- Machine screws join thin sheets of metal.
- Set screws secure shafts, prevent rotation, and adjust position.
- A cap screw is essentially a screw.
- A shoulder bolt has a shoulder under the head.
- UNC threads are Unified Coarse.
- UNF threads are Unified Fine.
- The major diameter of a thread is the largest diameter.
- The minor diameter of a thread is the smallest diameter.
- The pitch diameter is approximately the average of the major and minor diameters.
- FEA (Finite Element Analysis) is used in bolt design to analyze stress distributions.
- Hand calculations for bolted joints are suitable for simple geometries.
- High-temperature applications require bolts with improved creep resistance.
- Bolts in corrosive environments should be made of corrosion-resistant materials or protected with coatings.
- Aerospace applications often require bolts with a high strength-to-weight ratio.
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