unit 6: fasteners section 2: safety, tools and equipment, and shop practices
TRANSCRIPT
Unit 6: Fasteners
Section 2: Safety, Tools and Equipment, and Shop Practices
Objectives• After studying this chapter, you should
be able to:– Identify common fasteners used with wood– Identify common fasteners used on hollow
walls– Identify common fasteners used with sheet
metal– Write and explain a typical tapping screw
dimension
Objectives (cont’d.)– Identify typical machine screw heads– Write and explain each part of a machine
screw thread dimension– Identify and describe fasteners used in
masonry applications– Describe hanging devices for piping,
tubing, and ductwork– Describe solderless terminals and screw-
on wire connectors
Nails
• The most popular fastener for securing wood– Different styles and types for different uses
• Common nails• Masonry nails• Finishing nails• Roofing nails
– Nails are sized by the term “penny”
Nails (cont’d.)
Figure 6–1 (A) Common nails. (B) A finishing nailFigure 6–2 (A) A roofing nail. (B) A masonry nail
Staples and Rivets
• Staples are available in a number of sizes for different applications, such as fastening wire in place
• Rivets (pin or blind) are used to join two pieces of sheet metal
Staples and Rivets (cont’d.)
Figure 6.3 Staples used to fasten wire to wood
Figure 6.5 A staple that is clinched outward (used to fasten soft materials together)
Threaded Fasteners
• Wood screws– Fasten many types of materials to wood– Generally have a flat, round, or oval head
• Tapping screws– Also known as sheet metal screws– Some are self-drilling
Threaded Fasteners (cont’d.)
• Machine screws or bolts– Used in conjunction with nuts, which thread
onto the screw– Manufactured with different head shapes
including round and hex
• Set screws– Can have different heads– Typically used to secure pulleys to motor
or blower shafts
Threaded Fasteners (cont’d.)
• Anchors– Shield with a screw– Hollow wall
• Toggle bolts– Provide a secure anchoring in hollow tiles,
building block, plaster over lath, and gypsum board
Figure 6-21 (A) Front view of completed toggle bolt installation (B) Back view of completed toggle bolt installation Photos by Eugene Silberstein
Figure 6-20 Inserting the folded toggle into the hole in the gypsum board Photos by Eugene Silberstein
Figure 6-22 Plastic Toggle Photo by Eugene Silberstein
Figure 6-25 Securing object to the wall Photo by Eugene Silberstein
Figure 6-26 Self-drilling drywall anchors Photo by Eugene Silberstein
Figure 6-27 Installing the self-drilling drywall anchor. Photo by Eugene Silberstein
Threaded Fasteners (cont’d.)
• Threaded rod and steel channel or steel channel and pipe clamps can also be used
Figure 6-28 Using threaded rod and angle steel to fabricate a hanger
Concrete Fasteners
Figure 6-34 A concrete screw fastener
Figure 6-35 A lag shield anchor
Figure 6-36 A powder-actuated fastener systemPhoto by Eugene Silberstein
Other Fasteners• Include
– Cotter pins – Secure pins– Pipe hooks – Wire bent to form a “U” to
support pipes– Pipe straps – Mount pipes to a surface– Perforated strap – Strapping material with
spaced holes– Nylon straps – Secure flexible duct to
sheet metal collars
Other Fasteners (cont’d.)
– Grille clips – Mount supply registers and grilles
– Solderless terminals – Fasten stranded wire to various terminals or to connect two lengths of stranded wire together
– Screw-on wire connectors – Connect two or more wires together
Summary
• Many fasteners are used in the HVAC industry, including nails, screws, staples, anchors, and shields
• Wire hooks, pipe straps, perforated straps, and threaded rod can be used to mount piping materials, duct sections, and pieces of air conditioning equipment
Summary (cont’d.)
• Nylon straps can be used to secure flexible duct to sheet metal collars