Spanner Types and Materials
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Questions and Answers

What is a feature of some ratchet ring spanners?

  • They are only used for loosening fasteners
  • They have a switch to reverse the ratchet direction (correct)
  • They have a fixed jaw design
  • They are only used for tightening fasteners

    • What is a precaution to be taken when using open-ended ratchet spanners?

  • To use them with power tools only
  • To use them in areas with restricted access
  • To apply the final tightness to fasteners
  • Not to use them to apply the final tightness or 'crack' tight fasteners (correct)

    • What is the primary purpose of special spanners with a limited application?

  • To be used on any type of thread system
  • To be used on a specific component or in special tool kits (correct)
  • To be used on only metric fastening devices
  • To be used on a variety of fastening devices

    • What is the purpose of step-up and step-down adaptors?

    <p>To allow sockets to be used with different drives</p> Signup and view all the answers

    What material are some spanners made from to ensure spark resistance?

    <p>Copper alloys</p> Signup and view all the answers

    What shape is the socket aperture usually at one end?

    <p>Bi-hexagonal</p> Signup and view all the answers

    Where is the size of a spanner typically marked?

    <p>On the jaw face or on the shank</p> Signup and view all the answers

    What are the two main sizing systems used for spanners?

    <p>American/Unified and Imperial</p> Signup and view all the answers

    What is a common use of socket spanners?

    <p>To be used with power tools, such as nut runners</p> Signup and view all the answers

    What does the sizing on a BS spanner relate to?

    <p>The nominal diameter of the nut, bolt, or stud</p> Signup and view all the answers

    What is a potential hazard of using a ratchet ring spanner?

    <p>The spanner may trap the fastener</p> Signup and view all the answers

    What is indicated by a spanner marked 1/2 BS?

    <p>The spanner is used on a 1/2-inch Imperial fastening device</p> Signup and view all the answers

    What is a characteristic of the ring/open-ended spanner?

    <p>It has a bi-hexagonal end and open end.</p> Signup and view all the answers

    What is the purpose of the gap in each ring of a flare nut spanner?

    <p>To permit the spanner to be introduced to the hexagon where access is restricted.</p> Signup and view all the answers

    What is a common use of box spanners?

    <p>In conjunction with a tommy bar to access restricted areas.</p> Signup and view all the answers

    What is a characteristic of ratchet ring spanners?

    <p>They have a ratchet mechanism for rapid run-down or loosening.</p> Signup and view all the answers

    What is a common advantage of flare nut spanners?

    <p>They provide a better grip than an open-ended spanner.</p> Signup and view all the answers

    What is a requirement for using a box spanner?

    <p>The spanner must fit snugly on the nut or bolt head.</p> Signup and view all the answers

    What is the main purpose of a crowfoot socket?

    <p>To reach nuts in tight spaces</p> Signup and view all the answers

    What type of drives are composed of twisted steel wire strands?

    <p>Flexible drives</p> Signup and view all the answers

    What is the primary advantage of a knuckle or breaker bar?

    <p>It enables more force to be applied to crack tight fasteners</p> Signup and view all the answers

    What is the main difference between a flex socket and a crowfoot socket?

    <p>The type of nuts they can reach</p> Signup and view all the answers

    What is a common use for a speed brace?

    <p>Screwing down panels quickly</p> Signup and view all the answers

    What is a characteristic of some extension drives?

    <p>They have a modified drive square</p> Signup and view all the answers

    Why should adjustable spanners and wrenches not be used on aircraft components?

    <p>Because they may not fit snugly and can cause injury or damage</p> Signup and view all the answers

    What is the proper procedure for screwing a fastener into a threaded hole or anchor nut?

    <p>Turn the fastener while holding the nut steady</p> Signup and view all the answers

    Why should pipe unions always be tightened with two spanners?

    <p>To prevent rotation of the union</p> Signup and view all the answers

    What is a safety precaution to take when using a spanner?

    <p>Ensure your footing is sound and you are protected from falling</p> Signup and view all the answers

    What should be done when there are no torque loading instructions?

    <p>Do not use excessive loading or additional leverage</p> Signup and view all the answers

    Why should spanners and hands be free from oil or grease?

    <p>To reduce slipping hazards</p> Signup and view all the answers

    Study Notes

    Types of Spanners

    • Ring/Open-Ended Spanner: combines bi-hexagonal end and open end, with same size hexagonal head nut or bolt
    • Flare Nut Spanner: designed with a gap in each ring, permits introduction to hexagon in restricted access, engagement every 15° of handle movement
    • Box Spanner: gives full enclosure of nut or bolt head, used with tommy bar, must fit snugly on nut
    • Ratchet Ring Spanner: bi-hexagonal drive socket with ratchet mechanism, rapid run-down/loose of nuts/bolts without removal

    Spanner Materials and Sizing

    • Spanners made from case-hardened mild steel, hardened and tempered high-carbon steel, or alloy steel
    • Copper alloys used for spark-resistant tools
    • Two main sizing systems: British Standard Institution (BS) and British Association (BA) Imperial system, American/Unified (Imperial) and metric system
    • BS spanner sizing relates to nominal diameter of nut, bolt or stud

    Ratchet Spanners and Open-Ended Ratchet Spanners

    • Ratchet Ring Spanner: different size drive at each end, may or may not be cranked
    • Open-Ended Ratchet Spanner: modified jaw design, grip when turned in one direction, slip in the other, for rapid run-down/loose in restricted areas

    Socket Spanners and Drive Accessories

    • Socket spanners used with handles, extension pieces, and universal joints
    • Socket aperture bi-hexagonal at one end, square or hexagonal at the other
    • Common drive sizes: 1/4 in. and 3/8 in. square
    • Step-up and step-down adaptors available

    Crowfoot Sockets and Handles

    • Crowfoot sockets reach nuts in inaccessible locations, available with open, box, and flare-nut ends
    • Handles and adapters: extension drives, tee bars, knuckle or breaker bars, ratchet handles, and speed braces

    Safety Precautions and Best Practices

    • Use spanners of correct type and size, avoid shimming jaws of worn or oversized spanners
    • Hold bolt head firm with one spanner while moving nut with another
    • Turn fastener when screwing into threaded hole or anchor nut, otherwise turn nut
    • Pipe unions must be tightened with two spanners
    • Ensure footing is sound, hands and spanners are free from oil or grease

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    Description

    Learn about the different types of spanners, their materials, and sizes. This quiz covers the properties of spanners, including case-hardened mild steel, high-carbon steel, and copper alloys. Discover the various markings on spanners and their units of measurement.

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