Podcast
Questions and Answers
EASY What type of screwdriver is used to drive Robertson screws?
EASY What type of screwdriver is used to drive Robertson screws?
- Allen wrench
- Standard slot screwdriver
- Robertson screwdriver (correct)
- Phillips screwdriver
What is the purpose of set screws?
What is the purpose of set screws?
- To assemble shafts to parts (correct)
- To drive bolts
- To fasten machinery
- To connect two pipes
What is the purpose of a stud?
What is the purpose of a stud?
- To connect pipes
- To fasten machinery
- To remain in place while the nut is removed (correct)
- To drive bolts
What is the most common type of threaded fastener?
What is the most common type of threaded fastener?
How many sizes of bolts are recommended for general engineering use?
How many sizes of bolts are recommended for general engineering use?
What is the purpose of a cap screw?
What is the purpose of a cap screw?
What is the purpose of the washer face in a hex cap screw?
What is the purpose of the washer face in a hex cap screw?
What is the purpose of the ISO system of identification markings?
What is the purpose of the ISO system of identification markings?
What is the purpose of the formulae for ISO thread length?
What is the purpose of the formulae for ISO thread length?
What is the purpose of the ISO recommendations for clearance holes for metric bolts?
What is the purpose of the ISO recommendations for clearance holes for metric bolts?
What is the primary purpose of mechanical fasteners?
What is the primary purpose of mechanical fasteners?
Which type of fastener is used to permanently secure two pieces together?
Which type of fastener is used to permanently secure two pieces together?
What is the primary purpose of aligning fasteners?
What is the primary purpose of aligning fasteners?
What type of head is most commonly found on stove bolts?
What type of head is most commonly found on stove bolts?
What is unique about the neck of a carriage bolt?
What is unique about the neck of a carriage bolt?
What type of bolt is commonly used in automotive parts and plant machinery?
What type of bolt is commonly used in automotive parts and plant machinery?
What is a characteristic of machine screws?
What is a characteristic of machine screws?
What type of nut is usually supplied with stove bolts?
What type of nut is usually supplied with stove bolts?
What does the ISO designation system for property classes of fasteners consist of?
What does the ISO designation system for property classes of fasteners consist of?
What is the minimum tensile strength of a bolt stamped '12.9' in MPa?
What is the minimum tensile strength of a bolt stamped '12.9' in MPa?
What is the purpose of a flat washer?
What is the purpose of a flat washer?
What type of nut is used to hold wheel bearings and wheels in place?
What type of nut is used to hold wheel bearings and wheels in place?
What is the minimum yield strength of a bolt stamped '12.9' in MPa?
What is the minimum yield strength of a bolt stamped '12.9' in MPa?
What is the purpose of a lock washer?
What is the purpose of a lock washer?
What is the designation of the property class of a nut?
What is the designation of the property class of a nut?
What is the purpose of a jam nut?
What is the purpose of a jam nut?
MEDIUM What does the first digit in an ISO property class designation represent?
MEDIUM What does the first digit in an ISO property class designation represent?
What is the purpose of a lock washer?
What is the purpose of a lock washer?
What is the purpose of a castle nut?
What is the purpose of a castle nut?
What is the minimum yield strength of a bolt stamped '10.9' in MPa?
What is the minimum yield strength of a bolt stamped '10.9' in MPa?
What is the designation of the property class of a nut?
What is the designation of the property class of a nut?
What is the purpose of a flat washer?
What is the purpose of a flat washer?
What is the minimum tensile strength of a bolt stamped '14.9' in MPa?
What is the minimum tensile strength of a bolt stamped '14.9' in MPa?
What is the purpose of clearance holes for ISO metric bolts?
What is the purpose of clearance holes for ISO metric bolts?
Which type of threaded fastener is used in electrical equipment, household goods, and toys?
Which type of threaded fastener is used in electrical equipment, household goods, and toys?
What is the primary purpose of aligning fasteners?
What is the primary purpose of aligning fasteners?
Which type of head is available on machine bolts?
Which type of head is available on machine bolts?
What is unique about the threads of machine screws?
What is unique about the threads of machine screws?
Which type of fastener is used to fasten castings, forgings, and wooden parts to metal parts?
Which type of fastener is used to fasten castings, forgings, and wooden parts to metal parts?
What is the primary purpose of threaded fasteners?
What is the primary purpose of threaded fasteners?
Which type of fastener is used where a snug fit is required in a drilled or tapped hole?
Which type of fastener is used where a snug fit is required in a drilled or tapped hole?
What is the characteristic of the neck of a carriage bolt?
What is the characteristic of the neck of a carriage bolt?
What is the primary purpose of a set screw?
What is the primary purpose of a set screw?
What type of material is commonly used to make cap screws?
What type of material is commonly used to make cap screws?
What is the purpose of a stud removal tool?
What is the purpose of a stud removal tool?
What is the characteristic of bolts with a nominal diameter of 8 mm or larger?
What is the characteristic of bolts with a nominal diameter of 8 mm or larger?
What is the purpose of the ISO thread length formulae?
What is the purpose of the ISO thread length formulae?
What is the primary purpose of a Robertson screwdriver?
What is the primary purpose of a Robertson screwdriver?
What is the characteristic of a hex cap screw?
What is the characteristic of a hex cap screw?
What is the purpose of the ISO system of identification markings?
What is the purpose of the ISO system of identification markings?
What is the characteristic of a headless set screw?
What is the characteristic of a headless set screw?
What is the purpose of a bolt?
What is the purpose of a bolt?
HARD What is the main difference between stove bolts and machine screws?
HARD What is the main difference between stove bolts and machine screws?
Which type of fastener is best suited for use in tapped holes or through holes with nuts on the end?
Which type of fastener is best suited for use in tapped holes or through holes with nuts on the end?
What is the primary purpose of aligning fasteners like dowel or tapered pins?
What is the primary purpose of aligning fasteners like dowel or tapered pins?
What is the main characteristic of carriage bolts?
What is the main characteristic of carriage bolts?
What is the primary purpose of threaded fasteners like bolts, screws, and studs?
What is the primary purpose of threaded fasteners like bolts, screws, and studs?
What type of fastener is commonly used in castings, forgings, and wooden parts attached to metal parts?
What type of fastener is commonly used in castings, forgings, and wooden parts attached to metal parts?
What is unique about the threads of machine screws?
What is unique about the threads of machine screws?
What type of head is most commonly found on machine bolts?
What type of head is most commonly found on machine bolts?
What is the primary purpose of the washer face on a hex cap screw?
What is the primary purpose of the washer face on a hex cap screw?
What is the primary purpose of case hardening set screws?
What is the primary purpose of case hardening set screws?
What is the primary advantage of using headless set screws?
What is the primary advantage of using headless set screws?
What is the primary purpose of the ISO system of identification markings for fasteners?
What is the primary purpose of the ISO system of identification markings for fasteners?
What is the primary purpose of the formulae for ISO thread length?
What is the primary purpose of the formulae for ISO thread length?
What is the primary purpose of the ISO recommendations for clearance holes for metric bolts?
What is the primary purpose of the ISO recommendations for clearance holes for metric bolts?
What is the primary purpose of the stud removal tool?
What is the primary purpose of the stud removal tool?
What is the primary characteristic of cap screws made of low-carbon steel?
What is the primary characteristic of cap screws made of low-carbon steel?
What is the primary purpose of the hexagonal head on bolts?
What is the primary purpose of the hexagonal head on bolts?
What is the primary characteristic of bolts with a nominal diameter of 8 mm or larger?
What is the primary characteristic of bolts with a nominal diameter of 8 mm or larger?
What is the primary purpose of the ISO system of identification markings on fasteners?
What is the primary purpose of the ISO system of identification markings on fasteners?
What is the purpose of using a coarse thread instead of a fine thread on a metric bolt?
What is the purpose of using a coarse thread instead of a fine thread on a metric bolt?
What is the minimum tensile strength of a bolt stamped '8.8' in MPa?
What is the minimum tensile strength of a bolt stamped '8.8' in MPa?
What is the purpose of using a lock washer instead of a flat washer?
What is the purpose of using a lock washer instead of a flat washer?
What is the designation of the property class of a nut that has a minimum tensile strength of 1200 MPa?
What is the designation of the property class of a nut that has a minimum tensile strength of 1200 MPa?
What is the primary purpose of using a castle nut instead of a machine bolt nut?
What is the primary purpose of using a castle nut instead of a machine bolt nut?
What is the minimum yield strength of a bolt stamped '10.9' in MPa?
What is the minimum yield strength of a bolt stamped '10.9' in MPa?
What is the purpose of using a jam nut instead of a machine bolt nut?
What is the purpose of using a jam nut instead of a machine bolt nut?
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Study Notes
Mechanical Fasteners
- Devices used to fasten two or more parts of an object together
- Classified into three categories: threaded, fixed, and aligning
Threaded Fasteners
- Used to assemble and disassemble joints
- Examples: bolts, screws, and studs
- Types of threaded fasteners:
- Stove bolts
- Carriage bolts
- Machine bolts
- Machine screws
- Cap screws
- Set screws
- Studs
Stove Bolts
- Used in electrical equipment, household goods, and toys
- Available with flat, round, oval, and truss heads
- May have slotted, Phillips, or Robertson heads
Carriage Bolts
- Used to fasten castings, forgings, and wooden parts to metal parts
- Typically have truss type heads or square heads
- Have a square neck to prevent turning in wood or square holes
Machine Bolts
- Used where a snug fit is required in a drilled or tapped hole
- Typically have hexagonal heads
- Used in automotive parts and various plant machinery
Machine Screws
- Available in various head styles (e.g. fillister, flat, pan, truss)
- Hand driven by four basic tools: standard slot screwdriver, Phillips screwdriver, Robertson screwdriver, and Allen wrench
Cap Screws
- Used where a screw is required to have a finer tolerance and finish than machine screws
- Feature a washer face under the head and a chamfered point
- Made of low-carbon steel and commonly used in machinery construction
Set Screws
- Used for assembling shafts to parts or holding parts in a fixed relative position
- Available with various head and point styles (e.g. headless, cone, dog, hanger)
- Case hardened to withstand severe use
Studs
- Used extensively in equipment assembly
- Remains in place while the nut is removed
- Made from cylindrical stock threaded at both ends
- Installed and removed with a special stud removal tool
Bolts
- Most common type of threaded fastener
- May have square or hexagonal heads
- Torqued by open end, box, combination, or adjustable wrenches
Bolt Sizes
- Recommended sizes for general engineering use: 17 sizes available
- Sizes 8 mm in diameter and larger available in coarse and fine thread
- Preferred sizes have a better diameter/thread combination
Thread Length
- Recommended lengths by the International Standardization Organization (ISO)
- Formulae for thread length: 2 x Diameter, plus 6 mm
Mechanical Properties
- Identified by ISO marking symbols (e.g. 3.6, 4.6, 4.8, 5.6, etc.)
- Mechanical properties: tensile strength, yield strength, and identification
- Designation system: two digits separated by a decimal (e.g. 8.8, 10.9, 12.9)
Nuts
- Threaded metal pieces used to tighten and clamp parts together
- Types of nuts:
- Rough and semi-finished nuts
- Finished nuts
- Machine bolt nuts
- Jam nuts (lock or check nuts)
- Castle nuts
- Property classes of nuts: 4, 5, 6, 8, 10, 12, and 14
Washers
- Metal rings or discs used between a nut or bolt head and the work surface
- Types of washers:
- Flat washers
- Lock washers
- Used to prevent unwanted turning of a nut or bolt head
Mechanical Fasteners
- Devices used to fasten two or more parts of an object together
- Classified into three categories: threaded, fixed, and aligning
Threaded Fasteners
- Used to assemble and disassemble joints
- Examples: bolts, screws, and studs
- Types of threaded fasteners:
- Stove bolts
- Carriage bolts
- Machine bolts
- Machine screws
- Cap screws
- Set screws
- Studs
Stove Bolts
- Used in electrical equipment, household goods, and toys
- Available with flat, round, oval, and truss heads
- May have slotted, Phillips, or Robertson heads
Carriage Bolts
- Used to fasten castings, forgings, and wooden parts to metal parts
- Typically have truss type heads or square heads
- Have a square neck to prevent turning in wood or square holes
Machine Bolts
- Used where a snug fit is required in a drilled or tapped hole
- Typically have hexagonal heads
- Used in automotive parts and various plant machinery
Machine Screws
- Available in various head styles (e.g. fillister, flat, pan, truss)
- Hand driven by four basic tools: standard slot screwdriver, Phillips screwdriver, Robertson screwdriver, and Allen wrench
Cap Screws
- Used where a screw is required to have a finer tolerance and finish than machine screws
- Feature a washer face under the head and a chamfered point
- Made of low-carbon steel and commonly used in machinery construction
Set Screws
- Used for assembling shafts to parts or holding parts in a fixed relative position
- Available with various head and point styles (e.g. headless, cone, dog, hanger)
- Case hardened to withstand severe use
Studs
- Used extensively in equipment assembly
- Remains in place while the nut is removed
- Made from cylindrical stock threaded at both ends
- Installed and removed with a special stud removal tool
Bolts
- Most common type of threaded fastener
- May have square or hexagonal heads
- Torqued by open end, box, combination, or adjustable wrenches
Bolt Sizes
- Recommended sizes for general engineering use: 17 sizes available
- Sizes 8 mm in diameter and larger available in coarse and fine thread
- Preferred sizes have a better diameter/thread combination
Thread Length
- Recommended lengths by the International Standardization Organization (ISO)
- Formulae for thread length: 2 x Diameter, plus 6 mm
Mechanical Properties
- Identified by ISO marking symbols (e.g. 3.6, 4.6, 4.8, 5.6, etc.)
- Mechanical properties: tensile strength, yield strength, and identification
- Designation system: two digits separated by a decimal (e.g. 8.8, 10.9, 12.9)
Nuts
- Threaded metal pieces used to tighten and clamp parts together
- Types of nuts:
- Rough and semi-finished nuts
- Finished nuts
- Machine bolt nuts
- Jam nuts (lock or check nuts)
- Castle nuts
- Property classes of nuts: 4, 5, 6, 8, 10, 12, and 14
Washers
- Metal rings or discs used between a nut or bolt head and the work surface
- Types of washers:
- Flat washers
- Lock washers
- Used to prevent unwanted turning of a nut or bolt head
Mechanical Fasteners
- Devices used to fasten two or more parts of an object together
- Classified into three categories: threaded, fixed, and aligning
Threaded Fasteners
- Used to assemble and disassemble joints
- Examples: bolts, screws, and studs
- Types of threaded fasteners:
- Stove bolts
- Carriage bolts
- Machine bolts
- Machine screws
- Cap screws
- Set screws
- Studs
Stove Bolts
- Used in electrical equipment, household goods, and toys
- Available with flat, round, oval, and truss heads
- May have slotted, Phillips, or Robertson heads
Carriage Bolts
- Used to fasten castings, forgings, and wooden parts to metal parts
- Typically have truss type heads or square heads
- Have a square neck to prevent turning in wood or square holes
Machine Bolts
- Used where a snug fit is required in a drilled or tapped hole
- Typically have hexagonal heads
- Used in automotive parts and various plant machinery
Machine Screws
- Available in various head styles (e.g. fillister, flat, pan, truss)
- Hand driven by four basic tools: standard slot screwdriver, Phillips screwdriver, Robertson screwdriver, and Allen wrench
Cap Screws
- Used where a screw is required to have a finer tolerance and finish than machine screws
- Feature a washer face under the head and a chamfered point
- Made of low-carbon steel and commonly used in machinery construction
Set Screws
- Used for assembling shafts to parts or holding parts in a fixed relative position
- Available with various head and point styles (e.g. headless, cone, dog, hanger)
- Case hardened to withstand severe use
Studs
- Used extensively in equipment assembly
- Remains in place while the nut is removed
- Made from cylindrical stock threaded at both ends
- Installed and removed with a special stud removal tool
Bolts
- Most common type of threaded fastener
- May have square or hexagonal heads
- Torqued by open end, box, combination, or adjustable wrenches
Bolt Sizes
- Recommended sizes for general engineering use: 17 sizes available
- Sizes 8 mm in diameter and larger available in coarse and fine thread
- Preferred sizes have a better diameter/thread combination
Thread Length
- Recommended lengths by the International Standardization Organization (ISO)
- Formulae for thread length: 2 x Diameter, plus 6 mm
Mechanical Properties
- Identified by ISO marking symbols (e.g. 3.6, 4.6, 4.8, 5.6, etc.)
- Mechanical properties: tensile strength, yield strength, and identification
- Designation system: two digits separated by a decimal (e.g. 8.8, 10.9, 12.9)
Nuts
- Threaded metal pieces used to tighten and clamp parts together
- Types of nuts:
- Rough and semi-finished nuts
- Finished nuts
- Machine bolt nuts
- Jam nuts (lock or check nuts)
- Castle nuts
- Property classes of nuts: 4, 5, 6, 8, 10, 12, and 14
Washers
- Metal rings or discs used between a nut or bolt head and the work surface
- Types of washers:
- Flat washers
- Lock washers
- Used to prevent unwanted turning of a nut or bolt head
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