Podcast
Questions and Answers
The major diameter is the ________ diameter of the thread.
The major diameter is the ________ diameter of the thread.
largest
The minor diameter is the ________ diameter of the thread.
The minor diameter is the ________ diameter of the thread.
smallest
The units of pitch are mm or inches per _______________.
The units of pitch are mm or inches per _______________.
thread
What are the two most common thread forms?
What are the two most common thread forms?
External threads may be cut using a ________.
External threads may be cut using a ________.
Internal thread may be cut using a _________.
Internal thread may be cut using a _________.
A tap drill is used when manufacturing _____________ threads.
A tap drill is used when manufacturing _____________ threads.
In the thread notation 1/4 - 20 UNC, what is 20?
In the thread notation 1/4 - 20 UNC, what is 20?
In the thread notation 1/2 - 13 UNC, what is UN?
In the thread notation 1/2 - 13 UNC, what is UN?
In the thread notation 3/8 - 24 UNF, what is F?
In the thread notation 3/8 - 24 UNF, what is F?
In the notation 5/8 - 24 UNEF -- 2A - RH, what is 2?
In the notation 5/8 - 24 UNEF -- 2A - RH, what is 2?
In the notation 1 - 8 UNC -- 3B - RH, what is B?
In the notation 1 - 8 UNC -- 3B - RH, what is B?
In the notation 1/2 - 20 UNF -- 2B - LH, what is LH?
In the notation 1/2 - 20 UNF -- 2B - LH, what is LH?
In the notation #10 - 24 UNC, what is #10?
In the notation #10 - 24 UNC, what is #10?
In the notation M5 x 0.8, M stands for ______________.
In the notation M5 x 0.8, M stands for ______________.
In the notation M4 x 0.7, what is 4?
In the notation M4 x 0.7, what is 4?
In the notation M12 x 1.25, what is 1.25?
In the notation M12 x 1.25, what is 1.25?
In the notation M6 x 1 -- 4h6h -- RH, what is 4h6h?
In the notation M6 x 1 -- 4h6h -- RH, what is 4h6h?
Which one is the fine thread in M20 x 2.5 and M20 x 1.5?
Which one is the fine thread in M20 x 2.5 and M20 x 1.5?
The schematic thread symbol draws lines at every crest and _______________.
The schematic thread symbol draws lines at every crest and _______________.
The simplified thread symbol uses a _____________ line to represent the minor diameter on external threads.
The simplified thread symbol uses a _____________ line to represent the minor diameter on external threads.
How much longer is the tap drill depth than the thread depth when using a taper tap?
How much longer is the tap drill depth than the thread depth when using a taper tap?
The tap drill diameter is closest in size to the __________ diameter.
The tap drill diameter is closest in size to the __________ diameter.
A bolt or screw clearance hole diameter depends on what factors?
A bolt or screw clearance hole diameter depends on what factors?
A standard parts sheet contains enough information about the standard parts so that they may be...
A standard parts sheet contains enough information about the standard parts so that they may be...
A standard parts sheet contains drawings of all purchased parts.
A standard parts sheet contains drawings of all purchased parts.
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Study Notes
Thread Characteristics
- Major diameter refers to the largest diameter of a thread.
- Minor diameter indicates the smallest diameter of a thread.
Thread Measurement Units
- Pitch is measured in either millimeters or inches per thread.
Common Thread Forms
- Two most frequent thread forms are unified and metric screw threads.
Thread Cutting Techniques
- External threads can be cut using a die or lathe.
- Internal threads are created with a tap.
- A tap drill is essential for manufacturing internal threads.
Unified National Thread Designations
- In 1/4 - 20 UNC, "20" signifies 20 threads per inch, resulting in a pitch of 1/20.
- "UN" in 1/2 - 13 UNC indicates it is a Unified National thread form.
- In 3/8 - 24 UNF, "F" denotes fine thread series.
Thread Classes and Types
- In 5/8 - 24 UNEF -- 2A - RH, "2" denotes a thread class for normal production fit.
- "B" in 1 - 8 UNC -- 3B - RH represents internal threads.
- "LH" in 1/2 - 20 UNF -- 2B - LH indicates left-handed threads.
- "#10" in #10 - 24 UNC corresponds to the major diameter.
Metric Thread Designations
- "M" in M5 x 0.8 signifies a metric thread form.
- The number "4" in M4 x 0.7 reflects the major diameter.
- In M12 x 1.25, "1.25" indicates pitch, which is 1.25 mm per thread.
- "4h6h" in M6 x 1 -- 4h6h -- RH represents the tolerance class.
- M20 x 1.5 is identified as a fine thread in comparison to M20 x 2.5.
Thread Symbolization
- The schematic thread symbol includes lines drawn at both the crest and the root of the thread.
- Simplified thread symbols employ a hidden line to depict the minor diameter on external threads.
Tap Drill and Clearance Hole Specifications
- When using a taper tap, the tap drill depth extends 3 times the pitch beyond the thread depth.
- The tap drill diameter closely matches the minor diameter of the thread.
- The clearance hole diameter for bolts or screws depends on the major diameter and the desired fit.
Standard Parts Sheet
- Standard parts sheets include sufficient information for purchasing standard parts.
- It is incorrect to claim that these sheets contain drawings of all purchased parts.
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