1-1a-8 Chapter 2
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Questions and Answers

What is the main difference between structural screws and structural bolts?

  • Structural screws are always made from carbon steel.
  • Structural screws are used only in secondary structures.
  • Structural screws have a different type of head than structural bolts. (correct)
  • Structural screws have a higher tensile strength than bolts.

    • Which component of a screw ensures proper fit for the screwdriver?

  • The threads of the screw
  • The body of the screw
  • The shafts of the screw
  • The head of the screw (correct)

    • What characteristic is NOT typically associated with screws used in aircraft?

  • Screws are usually threaded only partially along their length. (correct)
  • Each screw has a specific tensile strength for grip stresses.
  • Screws can be identified by applicable codes.
  • Screws can have different types of heads and slotted recesses.

    • What types of screws are specifically designed to provide a flush surface when installed?

    <p>Flathead machine screws</p> Signup and view all the answers

    What is one acceptable reason for a vendor to mark screws and bolts differently?

    <p>To identify their trade mark if desired.</p> Signup and view all the answers

    Which type of screws are often fabricated from materials like aluminum alloy and brass?

    <p>Machine screws</p> Signup and view all the answers

    What is one common characteristic of screws used in aircraft applications?

    <p>They have a definite grip and shear strength like bolts.</p> Signup and view all the answers

    Which of the following is NOT a group classification of screws?

    <p>Electrical screws</p> Signup and view all the answers

    What is the minimum tensile strength for steel classified under MIL-B-6812?

    <p>125,000 PSI</p> Signup and view all the answers

    Which material is specified for Grade B8C in terms of corrosion resistance?

    <p>18 Cr 8 Ni, Columbium</p> Signup and view all the answers

    What is the Rockwell Hardness range for steel classified under ASTM A-325?

    <p>C23-32</p> Signup and view all the answers

    For bolts classified under ASTM A-354 Grade BD, what is the minimum tensile strength?

    <p>115,000 PSI</p> Signup and view all the answers

    Which of the following grades has the highest minimum tensile strength among steel, alloy, quenched, and tempered materials?

    <p>Grade B7A</p> Signup and view all the answers

    What is the classification of steel with a minimum tensile strength of 85,000 PSI?

    <p>Aluminum Alloy</p> Signup and view all the answers

    Identify the tensile strength characteristic of Steel, Carbon, Free Machining under ASTM A-307 Grade A.

    <p>55,000 PSI</p> Signup and view all the answers

    Which material specification indicates a minimum tensile strength of 62,000 PSI?

    <p>MIL-B-7874</p> Signup and view all the answers

    What is the minimum tensile strength for ASTM A-354 Grade BB?

    <p>105,000 PSI</p> Signup and view all the answers

    Which grade has a Rockwell Hardness range of C19-30?

    <p>ASTM A-325</p> Signup and view all the answers

    What does the letter 'H' indicate in the part number NAS560HK4-0?

    <p>High temperature</p> Signup and view all the answers

    In the part number NAS584-5, what does the dash number indicate?

    <p>Grip length in sixteenths</p> Signup and view all the answers

    Which material specification is associated with NAS586?

    <p>MIL-S-5000</p> Signup and view all the answers

    The letter 'C' before the first dash number indicates what type of screw?

    <p>Corrosion-resisting steel screw</p> Signup and view all the answers

    What strength class is associated with a NAS590 screw of size 5/8-18?

    <p>UNF-3A</p> Signup and view all the answers

    What does 'K' indicate in a part number like NAS560CK3P12?

    <p>Cross recess screw</p> Signup and view all the answers

    How is the grip length described in a part number like NAS583?

    <p>In sixteenths of an inch</p> Signup and view all the answers

    Which of the following tensile strengths corresponds to NAS588?

    <p>25,600</p> Signup and view all the answers

    What type of screw is indicated by the part number AN505PB4-8?

    <p>Cadmium-plated brass screw</p> Signup and view all the answers

    What is the maximum shear strength for NAS586 screws?

    <p>14,000</p> Signup and view all the answers

    Which part number represents a structural screw with a diameter of 3/16 inch?

    <p>NAS560CK3P12</p> Signup and view all the answers

    What does the 'R' between the first and second dash number signify?

    <p>Recessed head screw</p> Signup and view all the answers

    Which specification is applied to corrosion-resistant steel used for NAS screws?

    <p>QQ-S-763</p> Signup and view all the answers

    What type of screws are specifically designed for applications requiring high strength and compactness of assembled parts?

    <p>Socket head machine screws</p> Signup and view all the answers

    Which type of screw is utilized to temporarily attach sheet metal for riveting?

    <p>Self-tapping screws</p> Signup and view all the answers

    Which of the following materials is commonly used for making pan head and truss head screws?

    <p>Corrosion-resistant steel</p> Signup and view all the answers

    What is the main feature of self-tapping screws in terms of installation?

    <p>They cut their own thread as they are screwed in.</p> Signup and view all the answers

    Which one of these indicates a corrosion-resistant steel screw in part numbering?

    <p>C before the first dash number</p> Signup and view all the answers

    What does the first dash number in a screw part number indicate?

    <p>Screw size</p> Signup and view all the answers

    What is a key characteristic of the truss head screw?

    <p>It has a higher head height than pan head screws.</p> Signup and view all the answers

    Which material specification applies to NAS220 structural screws?

    <p>QQ-S-763</p> Signup and view all the answers

    What does 'NF-3' indicate in the context of screw classification?

    <p>It indicates different tensile strength classes.</p> Signup and view all the answers

    Which property is NOT typically associated with socket head machine screws?

    <p>Low strength</p> Signup and view all the answers

    In which situation would you most likely use a brazier head screw?

    <p>Where a low profile is required</p> Signup and view all the answers

    What is a primary use for pan head screws?

    <p>In general-purpose fastening</p> Signup and view all the answers

    What is the characteristic of high temperature screws manufactured from corrosion-resistant steel?

    <p>They are indicated with an 'H' in part numbers.</p> Signup and view all the answers

    Which aspect is NOT considered when selecting the appropriate screw type for a specific application?

    <p>Screw color</p> Signup and view all the answers

    What defines the grip length of a screw?

    <p>Distance from the underhead bearing surface to the beginning of the bevel prior to the threads</p> Signup and view all the answers

    Which screws are designed specifically for electrical use?

    <p>AN508 brass screws</p> Signup and view all the answers

    What is the rockwell hardness maximum for SAE Grade 2 screws?

    <p>B100</p> Signup and view all the answers

    Which of the following materials is used for SAE Grade 5 screws?

    <p>Steel, Medium Carbon</p> Signup and view all the answers

    How is the shank of a screw defined?

    <p>The combination of the body and threads</p> Signup and view all the answers

    Which marking indicates a Grade 8 screw?

    <p>6 Radial Dashes</p> Signup and view all the answers

    What is the minimum tensile strength for Grade 3 screws?

    <p>110,000 PSI</p> Signup and view all the answers

    What does a single dash marking indicate for corrosion-resistant screws?

    <p>Steel, Corrosion Resistant</p> Signup and view all the answers

    Which AN screw is used as a fine thread general-purpose screw?

    <p>AN520</p> Signup and view all the answers

    What criterion changes the classification or specification marking on screws?

    <p>The size of the screw</p> Signup and view all the answers

    What is the yield strength minimum for SAE Grade 7 screws?

    <p>130,000 PSI</p> Signup and view all the answers

    Which type of hardness is measured for tensile strength in screws?

    <p>Rockwell Hardness</p> Signup and view all the answers

    What characterizes the AN515 and AN520 screws?

    <p>Both can have slotted or recessed heads</p> Signup and view all the answers

    What does the 'C' prefix in the part number indicate for a setscrew?

    <p>It is a corrosion-resistant steel setscrew.</p> Signup and view all the answers

    In the part number NAS1081-4A12, what does the '12' represent?

    <p>The screw length in inches.</p> Signup and view all the answers

    Which material specifications are associated with self-locking setscrews?

    <p>Military Specification MIL-S-6758.</p> Signup and view all the answers

    What does the 'A' in the part number NAS1081-4A12 signify in terms of point design?

    <p>Flat point.</p> Signup and view all the answers

    What does the first dash number signify in setscrew part numbers?

    <p>The diameter or size of the screw.</p> Signup and view all the answers

    What is the maximum size for a 1/4-28 self-locking setscrew according to the specifications?

    <p>.1270 inches.</p> Signup and view all the answers

    In drill sizes, what overall length is designated for an extractor size No. 3?

    <p>2 11/16 inches.</p> Signup and view all the answers

    What does the part number prefix 'C' indicate in the context of machine screws?

    <p>Corrosion-resistant steel</p> Signup and view all the answers

    Which material is NOT specified for use in high-grade alloy setscrews?

    <p>Aluminum.</p> Signup and view all the answers

    Which part number corresponds to a socket head cap screw that is cadmium-plated and has a diameter of 1/4 inch?

    <p>NAS608-4-8P</p> Signup and view all the answers

    What is the tensile strength of a 1/4-28 NF-3A screw?

    <p>5790</p> Signup and view all the answers

    In the part number AN500A6-8, what does 'A' indicate?

    <p>Drilled head type</p> Signup and view all the answers

    Which of the following is a characteristic of a NAS600 through NAS606 machine screw?

    <p>Pan head with steel construction</p> Signup and view all the answers

    What is the maximum shear strength of a 5/16-24 UNC-3A screw?

    <p>6815</p> Signup and view all the answers

    What does a threaded part number like AN115405 indicate about its thread size?

    <p>4-40</p> Signup and view all the answers

    Which material specification is referenced for corrosion-resistant steel in machine screws?

    <p>Federal Specification QQ-S-763</p> Signup and view all the answers

    What is indicated by the first dash number in part numbers of NAS screws?

    <p>Screw size</p> Signup and view all the answers

    What class is assigned to a 10-24 NC screw according to the tables provided?

    <p>NC</p> Signup and view all the answers

    For the part number AN501-416, what is the thread size?

    <p>1/4-28</p> Signup and view all the answers

    What type of head does an AN500 machine screw typically have?

    <p>Fillister head</p> Signup and view all the answers

    How does the thread size affect the classification of screws?

    <p>It influences the diameter and compatibility.</p> Signup and view all the answers

    Which tensile strength is associated with Grade B8 cold drawn material for diameters over 3/4 to 1?

    <p>125,000 PSI Min</p> Signup and view all the answers

    What is the Rockwell hardness range for Grade B7 alloy steel according to military specification MIL-S-1222B?

    <p>C25-35</p> Signup and view all the answers

    For Grade L10 nickel steel, what is the minimum tensile strength?

    <p>70,000 PSI Min</p> Signup and view all the answers

    What marking indicates that a screw is made of aluminum alloy?

    <p>A single dash</p> Signup and view all the answers

    Which grade of steel is associated with AISI 4340?

    <p>Grade L7</p> Signup and view all the answers

    What are the physical characteristics of Grade B8C cold drawn steel?

    <p>Tensile strength of 125,000 PSI Min</p> Signup and view all the answers

    What is the tensile strength requirement for screws classified as having a fillister head?

    <p>Always 125,000 PSI Min</p> Signup and view all the answers

    Which grade has the lowest minimum tensile strength according to the markings provided?

    <p>Grade L10</p> Signup and view all the answers

    For diameters from 1-1/4 to 1-1/2, which minimum tensile strength is required for Grade B8F?

    <p>100,000 PSI Min</p> Signup and view all the answers

    Which marking is used to indicate high strength alloy steel for close-tolerance shank and/or head?

    <p>Triangle with a dimple inside</p> Signup and view all the answers

    What AISI grade corresponds to Grade B8 material?

    <p>AISI 304</p> Signup and view all the answers

    What is the maximum tensile strength for screws of size 1/4-28 according to the provided standards?

    <p>4520 PSI</p> Signup and view all the answers

    Which material is associated with Grade L43?

    <p>Steel, Nickel-Chromium-Molybdenum</p> Signup and view all the answers

    What distinguishes a fillister head screw from other types?

    <p>It possesses a thread-cutting slot.</p> Signup and view all the answers

    What is the minimum tensile strength of the aluminum copper magnesium alloy specified?

    <p>62,000 PSI</p> Signup and view all the answers

    What is the recommended method to remove a broken screw?

    <p>Drill a pilot hole and use a screw extractor.</p> Signup and view all the answers

    What does the first dash number in a part number indicate?

    <p>Screw size</p> Signup and view all the answers

    What type of setscrew has a locking element built into the shank?

    <p>Self-locking setscrew</p> Signup and view all the answers

    What size screw extractor is recommended to use?

    <p>The largest screw extractor possible</p> Signup and view all the answers

    What material is specified for AN535 screws?

    <p>Steel</p> Signup and view all the answers

    Which table refers to the sizes for self-tapping screws?

    <p>Table 2-33</p> Signup and view all the answers

    What diameter is used for drill holes for screws of size 6-20?

    <p>.106 inches</p> Signup and view all the answers

    What does the second dash number in a part number signify?

    <p>Length in 1/16-inch increments</p> Signup and view all the answers

    For which screw size is the drill hole advised to be .149 inches in diameter?

    <p>8-18</p> Signup and view all the answers

    Which type of setscrew is primarily used to secure components like gears on a shaft?

    <p>Hexagon socket setscrew</p> Signup and view all the answers

    What is used to lubricate during the screw extraction process?

    <p>Cutting oil</p> Signup and view all the answers

    In the context of this document, what are AN530 screws classified as?

    <p>Sheet metal screws</p> Signup and view all the answers

    What maximum head height is listed for an AN545, size 2 screw?

    <p>.069 inches</p> Signup and view all the answers

    For which screw size is the maximum diameter .087 inches as per the tables provided?

    <p>Size 12</p> Signup and view all the answers

    What is the minimum tensile strength for aluminum magnesium chrome as specified in the federal specification?

    <p>34,000 PSI</p> Signup and view all the answers

    Which of the following specifications corresponds to aluminum copper magnesium manganese heat treated alloys?

    <p>QQ-A-362</p> Signup and view all the answers

    What type of screw is specifically described as being used to attach nameplates to castings?

    <p>Drive screws</p> Signup and view all the answers

    What does the 'C' indicate in the part number of screws?

    <p>Corrosion-resistant steel</p> Signup and view all the answers

    According to the specifications, self-tapping screws should never be used to replace which of the following?

    <p>All of the above</p> Signup and view all the answers

    Which of the following is true concerning the installation of drive screws?

    <p>They must be hammered into place.</p> Signup and view all the answers

    What is the characteristic of aluminum copper magnesium with 1.5 percent manganese when heat treated?

    <p>62,000 PSI tensile strength</p> Signup and view all the answers

    What does the term 'flathead' refer to in the context of AN531 screws?

    <p>Screw shape</p> Signup and view all the answers

    What minimum tensile strength is associated with carbon mild, quarter-hard steel screws?

    <p>55,000 PSI</p> Signup and view all the answers

    Which screw type is manufactured from steel or brass for use in wood structures?

    <p>Wood screws</p> Signup and view all the answers

    Which of the following materials conforms to the federal specification QQ-S-633?

    <p>Carbon steel</p> Signup and view all the answers

    What is indicated by the letter 'R' in the screw code?

    <p>Recessed head screw</p> Signup and view all the answers

    In the part number AN507C428-8, what does the letter 'C' denote?

    <p>Corrosion-resistant steel screw</p> Signup and view all the answers

    What type of material is used for corrosion-resistant screws as per Military Specification?

    <p>Steel</p> Signup and view all the answers

    Which material is indicated by the prefix 'PB' in a part number?

    <p>Brass screw with cadmium plating</p> Signup and view all the answers

    Which of the following represents a heat-treated aluminum alloy specification?

    <p>QQ-A-362</p> Signup and view all the answers

    What is the maximum shear strength for a NAS517 1/2-20 screw?

    <p>19,950</p> Signup and view all the answers

    In a NAS514 part number, what does 'P' preceding the first dash number indicate?

    <p>Phillips recessed head</p> Signup and view all the answers

    What would the material of the screw be if the part number contains 'B' before the dash number?

    <p>Brass</p> Signup and view all the answers

    Which screw size has a tensile strength of 2,490 psi according to NAS517 specifications?

    <p>10-32</p> Signup and view all the answers

    Which specification applies to the material of a NA515-8 screw?

    <p>QQ-B-626</p> Signup and view all the answers

    What is the shear strength for a 5/16-24 NAS514 screw according to its classification?

    <p>4340</p> Signup and view all the answers

    In the specification for AN508 screws, which is the correct material indicated?

    <p>Carbon steel</p> Signup and view all the answers

    For which screw size does the prefix 'F' indicate the head type?

    <p>3/8-24 screw</p> Signup and view all the answers

    What is the tensile strength for a NAS200-632 screw?

    <p>960</p> Signup and view all the answers

    Which of the following indicates a screw with a slotted head in its part number?

    <p>No prefix at all</p> Signup and view all the answers

    What does the first dash number in the part number NAS1404-8 signify?

    <p>Screw size</p> Signup and view all the answers

    Which of the following statements accurately describes the tensile strength of the NAS1406 part number?

    <p>15,200 psi</p> Signup and view all the answers

    What material specification applies to screws like NAS623?

    <p>MIL-S-5000</p> Signup and view all the answers

    In the part number AN526DD1032-8, what does 'DD' indicate?

    <p>Aluminum alloy</p> Signup and view all the answers

    Which head type corresponds to the AN504 part number designation?

    <p>Round head</p> Signup and view all the answers

    What does the 'R' in the part number signify, such as in AN504-4-8?

    <p>Recessed-head</p> Signup and view all the answers

    For the MS35188 part number, what material is specified?

    <p>Carbon steel</p> Signup and view all the answers

    Which tensile strength value corresponds to the NAS1405 part number?

    <p>9820 psi</p> Signup and view all the answers

    What kind of screw does the part number MS35204 represent?

    <p>Pan head</p> Signup and view all the answers

    The hole size for a 6-32 screw is indicated to be how large at its maximum for tapped holes?

    <p>0.144 inches</p> Signup and view all the answers

    Which of the following is a key characteristic of NAS1402 machine screws?

    <p>8-32 thread size</p> Signup and view all the answers

    What does the 'W' signify in part numbers like NAS623F4-10W?

    <p>Type I plating</p> Signup and view all the answers

    In the classification system, what does 'NF' represent?

    <p>National Fine threads</p> Signup and view all the answers

    Which property is NOT required for steel materials in military specifications for these screws?

    <p>Fractional inch size</p> Signup and view all the answers

    Study Notes

    Screw Types and Characteristics

    • Screws are common threaded fasteners on aircraft, similar to bolts but with lower material strength and looser thread fits
    • Screws have a lower material strength than bolts.
    • Their threads extend the entire length of the shank.
    • Screws are categorized into: structural, machine, self-tapping, and set screws.
    • Three main parts of a screw: Head, body, and threads
    • Three additional combinations of these three parts exists.
    • Screw length is measured from top of the head to the bottom of the threads.
    • Grip length is the distance from the underhead bearing surface to the thread bevel start. If not countersunk it equal to body length
    • Shank is the body and threads combined
    • Vendor is allowed to place trademarks on screw and bolt heads
    • Screw and bolt markings follow AN, NAS, or Military Standards, to identify material and physical properties.
    • Table 2-1 shows screw and bolt markings, with material codes.

    Structural Screws

    • Used in the primary aircraft structure
    • Similar to structural bolts/rivets, differing only in head type
    • Manufactured with high tensile strength and definite grip
    • The equivalents have equal shear strength with a similar-sized bolt
    • Various head types exist that require specific screwdrivers, for correct usage

    Machine Screws

    • General-purpose
    • Used in countersunk holes for flush surfaces
    • Available in 82- and 100-degree countersunk flathead styles.
    • Made from materials like carbon steel, corrosion-resistant steel, aluminum alloy, and brass
    • Vary in head recess/slot types

    Roundhead Machine Screws

    • AN508, AN515, and AN520 are available varieties.
    • AN508 is brass, for electrical use only, with a slotted head.
    • AN515 (coarse thread) and AN520 (fine thread) are general purpose, slotted or recessed.
    • Made of carbon steel, corrosion-resistant steel, and brass.

    Self-Tapping Screws

    • Cut their own threads in untapped holes
    • Used for attaching removable parts to castings
    • Available in flathead and roundhead styles
    • Thread cutting slot off-center to create thread cutting edge, enabling easy driving and perfect threads

    Self-Tapping Sheet Metal Screws

    • Used temporarily attaching sheet metal during riveting or assembling nonstructural parts in blind applications.

    Drive Screws

    • Self-tapping screws attaching nameplates or sealing drain holes.
    • Heads are not formed for screwdrivers, installed with a hammer.

    Wood Screws

    • Self-tapping screws used in wooden structures
    • Roundhead or flathead 82-degree countersunk is available
    • Manufactured from steel or brass.

    Setscrews

    • Hold components, such as gears, on shafts
    • Available in various point shapes.
    • Self-locking designs feature locking elements for enhanced grip.

    Extracting Broken Screws

    • Screw extractors used for quickly removing broken screws.
    • Recommended to user largest size extractor possible
    • Use proper size drill for the screw extractor, or use smaller or larger as required.

    Screw Markings (Tables 2-1, 2-2, etc.)

    • Tables provide detailed specifications for different screw types
    • Include material, strength, physical characteristics, and markings.
    • Tensile strength, shear strength, and Rockwell hardness data are included.
    • Each table describes specific screw types according to NAS, AN, or Military standards

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    Description

    Test your knowledge on the differences between structural screws and bolts, particularly in aircraft applications. This quiz covers the specifications, classifications, and materials used for aircraft fasteners. Ideal for students and professionals in the aerospace industry.

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