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Theory - Fasteners & Locking Devices
Information on Fasteners and Locking Devices
31
Education
Not Applicable
11/29/2012

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Cards

Term
What is used to transmit a heavy load between a shaft and pulley?
Definition
A gib-head key
Term
What is the minimum engagement of a screw?
Definition
They have a minimum engagement of 1.5x the diameter of the fastener
Term
What kind of machine screw head style requires a countersunk hole? What is the angle of this countersink?
Definition
Flat Head Screws require a countersunk hole at 82 degrees
Term
What are the 3 standard styles of set screws?
Definition
The 3 standard styles are Cup Point, Flat Point and Cone Point.
Term
Cap Screws are _____ driven.
Definition
Cap Screws are Internally driven
Term
What are half-dog and full-dog set screws used for?
Definition
They are used for alignment between a collar and shaft.
Term
What is the difference between a screw and bolt?
Definition
A bolt requires a mating nut. They also have different application.
Term
What do the numbers indicate on metric bolts and screws?
Definition
The last two numbers indicate the yield point which is a percent of the ultimate tensile strength. The first number(s) designate the ultimate tensile strength.
Term
What style of self locking washer has a higher holding power? What are some downsides?
Definition
The external self locking washer has more holding power than the internal equivalent. The downside is the external has reduced appearance, can snag and may be a safety concern.
Term
What is the purpose of flat washers?
Definition
To distribute pressure, protect a surface from wear and to act as a spacer.
Term
How are woodruff keys identified?
Definition
With a 3 or 4 digit number. The last two digits give the nominal key diameter in eights of an inch and the first digits give the width in 32nds of an inch. Example : a 1418 woodruff key would be 14/32" width and 18/8"(2 1/4") diameter.
Term
A dowel pin is made of _____ steel, and is ground to ______ inch over it's nominal diameter.
Definition
A dowel pin is made of hardened steel, and is ground to 0.0002 inch over it's nominal diameter.
Term
What makes a Pratt and Whitney key easier to align the hub and the key?
Definition
The rounded ends help with this.
Term
What is a key used for?
Definition
A key is used to mate a hub with a shaft. It's purpose is either to align or be a shear point.
Term
What are cotter pins used for?
Definition
They are used to keep other fasteners in place.
Term
How much over nominal size are radial locking/spring pins?
Definition
About 0.003"
Term
Before installing retaining/snap rings what should you refer to?
Definition
You should refer to manufacturing specifications.
Term
What are snap/retaining rings used for?
Definition
Snap/retaining rings provide a removable shoulder to locate, retain or lock components accurately;y on shafts, bores and inside housings.
Term
Why are acorn nuts used?
Definition
For safety and when appearance is important.
Term
What type of Nuts require cotter pins to lock them in place?
Definition
Hex Castle and Hex Slotted(Standard, Thick Slotted & High Slotted)
Term
Machine Screws are rarely more than ___ in diameter
Definition
Machine Screws are rarely more than 1/4" in diameter
Term
What is the purpose of a dowel pin?
Definition
They are used to align parts during assembly. They are not meant to hold them in place.
Term
What is the relation to the grade of a bolt/screw to the number of lines on the end? What grade is an exclusion to this rule?
Definition
For every line on the end of the bolt/screw add 2 to that number and you will have the grade of bolt. (i.e. 5 marks is a grade 7, 3 marks is a grade 5) The exception to this rule is a grade 3 bolt as it only has 2 marks and a bolt with no marks has a grade of 1.
Term
What type of head is common in woodworking/sheet metal?
Definition
The Robertson (Square)
Term
What shape is a Pratt & Whitney key?
Definition
It is a key with rounded ends.
Term
How are tapered pins sized?
Definition
They are sized by the length and the major diameter.
Term
What do cotter pins work with?
Definition
They work with clevis pins, castle nuts and slotted nuts.
Term
What is the OD of a #6-28 UNC Machine Screw?
Definition
OD = # x 0.013 + 0.060
OD = 6 x 0.013 + 0.060
OD = 0.138"
Term
What key is used on the end of a shaft?
Definition
A Gib-Head Key
Term
What is the taper of a tapered dowel pin?
Definition
1/4" TPF
Term
What is the taper of a gib-head key?
Definition
1/8" TPF
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