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Questions and Answers
What is the primary difference between machine screws and bolts in aircraft applications?
Which type of screw is known for having the same shear strength as a bolt of the same size?
What type of screwdriver should never be used on a Torqe-Set screw?
What is the purpose of self-tapping screws in aircraft construction?
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Which type of screw is made from lower strength materials and typically has loose-fitting threads?
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Identify the characteristic of Type A self-tapping screws.
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What common feature differentiates machine screws from structural screws?
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Which head type is not interchangeable with the others when referring to structural screws?
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What is a key characteristic of structural screws in aircraft construction?
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Which type of screw is specifically designed to join lightweight materials?
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What type of threads do self-tapping screws typically have?
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What is a common application for machine screws in aircraft?
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Which feature distinguishes machine screws from structural screws?
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What type of head does a Type A self-tapping screw have?
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Which statement is true regarding screwdriver compatibility with screws?
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What characteristic of structural screws makes them suitable for critical applications?
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Study Notes
Aircraft Screw Applications
- Screws are the most common threaded fasteners in aircraft, distinguished from bolts by generally being made of lower strength materials.
- Installed with loose-fitting threads; screw head shapes allow engagement with screwdrivers or wrenches.
- Screws can either have a defined grip length or be threaded along their entire length.
- Three main classifications in aircraft construction:
- Machine Screws: Widely used for attaching lightweight structural components.
- Structural Screws: Equivalent strength to bolts, made from alloy steel, heat treated.
- Self-Tapping Screws: Used primarily for joining thin materials like metal and plastic.
Machine Screws
- Extensively used for fairings, inspection plates, and clamps.
- Machine screws have threads running the full length of the shank, unlike bolts which have unthreaded grip lengths.
- Commonly available in National Coarse and National Fine threads with Class 2, or free, fit.
- Typical head types include fillister head, flat head, round head, and truss head.
Structural Screws
- Made from alloy steel and heat-treated, offering equal shear strength to a corresponding bolt size.
- Shank tolerances similar to AN hex-head bolts, with National Fine threads.
- Available head types include fillister, flat, and washer heads; these are not interchangeable.
- Proper screwdriver type is crucial to prevent damage; avoid mismatching screwdrivers with screw types (e.g., using a Philips on a Torqe-Set screw).
Self-Tapping Screws
- Characterized by coarse threads; ideal for thin sheets of materials.
- Type A features a sharp gimlet point; Type B has a blunt point with finer threads.
- Available head types:
- Round head
- Truss head
- Countersunk head (flat on top)
- Countersunk oval head.
- Truss head is thinner than the round head.
Dowels
- Dowels are solid cylindrical rods utilized for precision alignment between mating surfaces.
- Types of dowels used in aircraft construction include:
- Smooth Solid Dowels: High-quality steel pins ensuring excellent surface finish.
- Hollow Dowels
- Threaded Dowels
- Split Hollow Dowels
- Split hollow dowels can also function as bushings for rotating parts.
- Smooth-sided dowels are typically press-fit installed for stability.
Aircraft Screw Applications
- Screws are the most common threaded fasteners in aircraft, distinguished from bolts by generally being made of lower strength materials.
- Installed with loose-fitting threads; screw head shapes allow engagement with screwdrivers or wrenches.
- Screws can either have a defined grip length or be threaded along their entire length.
- Three main classifications in aircraft construction:
- Machine Screws: Widely used for attaching lightweight structural components.
- Structural Screws: Equivalent strength to bolts, made from alloy steel, heat treated.
- Self-Tapping Screws: Used primarily for joining thin materials like metal and plastic.
Machine Screws
- Extensively used for fairings, inspection plates, and clamps.
- Machine screws have threads running the full length of the shank, unlike bolts which have unthreaded grip lengths.
- Commonly available in National Coarse and National Fine threads with Class 2, or free, fit.
- Typical head types include fillister head, flat head, round head, and truss head.
Structural Screws
- Made from alloy steel and heat-treated, offering equal shear strength to a corresponding bolt size.
- Shank tolerances similar to AN hex-head bolts, with National Fine threads.
- Available head types include fillister, flat, and washer heads; these are not interchangeable.
- Proper screwdriver type is crucial to prevent damage; avoid mismatching screwdrivers with screw types (e.g., using a Philips on a Torqe-Set screw).
Self-Tapping Screws
- Characterized by coarse threads; ideal for thin sheets of materials.
- Type A features a sharp gimlet point; Type B has a blunt point with finer threads.
- Available head types:
- Round head
- Truss head
- Countersunk head (flat on top)
- Countersunk oval head.
- Truss head is thinner than the round head.
Dowels
- Dowels are solid cylindrical rods utilized for precision alignment between mating surfaces.
- Types of dowels used in aircraft construction include:
- Smooth Solid Dowels: High-quality steel pins ensuring excellent surface finish.
- Hollow Dowels
- Threaded Dowels
- Split Hollow Dowels
- Split hollow dowels can also function as bushings for rotating parts.
- Smooth-sided dowels are typically press-fit installed for stability.
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Description
Test your knowledge on the various applications and classifications of screws used in aircraft construction. This quiz covers machine screws, structural screws, and self-tapping screws, detailing their specific uses and characteristics. Ensure you're familiar with these essential fasteners in aviation.
