STANDARD

DDF 106 - FASTENERS

Course Description

Provides knowledge and skills necessary to draw and specify fasteners. Topics include: utilization of technical reference sources, types of threads, representation of threads, specifying threads, fasteners, and welding symbols.

Competency Areas Hours

Utilization of Technical Reference Sources	Class/Week	1
Types of Threads	D. Lab/Week	4
Representation of Threads	P. Lab/Week
Specifying Threads	Credit Hours	3
Fasteners
Welding Symbols

Prerequisite/Corequisite DDF 105

COURSE GUIDE

Competency	After completing this section, the student will:	Hours
		Class	D.Lab	P.Lab
UTILIZATION OF TECHNICAL REFERENCE SOURCES		1	0
Sources of fastener standards	Identify sources for standardized fasteners.
TYPES OF THREADS		1	0
Thread terms	Explain external thread, internal thread, major diameter, minor diameter, crest, root, depth of thread, pitch, pitch diameter, lead, threads per inch, form, right-hand thread, left-hand thread, single thread, and multiple thread.
Thread types	Identify V, square, Acme, knuckle, sharp V, worm, and buttress type threads.
REPRESENTATION OF THREADS		1	5
Symbols	Identify detailed, schematic, and simplified thread symbols. State the reason for not using detailed thread symbols in working drawings.
Drawing	Draw V-thread using detailed, schematic and simplified symbols.
	Draw square threads using detailed, schematic, and simplified symbols.
SPECIFYING THREADS		1	0
Thread class	State the three classes of internal and external threads. Identify an appropriate use for each of the three classes of threads.
FASTENERS		1	0
Threaded	Identify machine screws, cap screws, captive screws, tapping screws, bolts, and studs.
Heads	Identify hex, square, pan, binding, washer, oval, flat, fillister, truss, and 12-point head fasteners.
Points	Identify cup, flat, cone, oval, and half dog point fasteners.
Studs	Identify double end and continuous thread studs.
Washers	Identify flat, conical, helical spring, tooth lock, and spring washers.
Special	Identify a setscrew. Identify prevailing-torque and free-spinning locknuts. Identify a captive nut.
Keys	Identify square, flat, gib-head, Pratt and Whitney, and Woodruff keys.
Pins	Identify hardened and ground dowel, commercial straight, taper, clevis, and standard cotter pins.
Retaining rings	Identify axially assembled, radially assembled, and self-locking stamped retaining rings. Identify a wire-formed retaining ring. Identify a spiral-wound retaining ring.
Springs	Identify a compression, extension, extension torsion, power, and flat spring.
Rivets	Identify a semitubular, full tubular, bifurcated, and compression rivet. Identify a blind rivet.
Welded	State the two groups of welded fasteners.
Adhesives	Explain adhesion and stress. Identify lap, angle, butt, cylindrical, corner, and stiffener joints.
WELDING SYMBOLS		5	35
Welding processes	Describe arc, gas, and resistance welding.
Welding joints	Identify T, butt, corner, lap, and edge welding joints.
Symbol terminology	Explain the difference between weld symbol and welding symbol.
Symbol elements	Identify the eight elements of a welding symbol.
Types of welds	Identify fillet and groove welds.
Drawing	Draw the five types of welded joints applying the welding symbols for the appropriate welds.

Suggested Resources

Suggested Resources include textbooks shown below or most current edition.

Croft, F. M., et al. (1989). Engineering graphics. New York: John Wiley & Sons.

French, T. E., et al. (1986). Engineering drawing & graphic technology (13th ed.). New York: McGraw-Hill.

Giesecke, F. F., et al. (1989). Principles of engineering graphics. New York: Macmillan.

Jensen, C. H., & Helsel, J. D. (1989). Engineering drawing & design (4th ed.). New York: McGraw-Hill.

Spence, W. P. (1988). Engineering graphics (2nd ed.). Englewood Cliffs, NJ: Prentice Hall.