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Description
UNIFIED NATIONAL COURSE UNC TAPSSutton Tools manufactures high quality UNC (Unified National Course) thread taps designed for specialized engineering, automotive, and aerospace applications where custom or fine pitch thread configurations are required. Here is the exact breakdown of what #8 32 means: 1. The "#8" Represents the Major Diameter The first number specifies the nominal outside diameter of the screw thread. For sizes smaller than 1 4 inch, the UTS system uses a numbering
Sutton Tools manufactures high-quality UNC (Unified National Course) thread taps designed for specialized engineering, automotive, and aerospace applications where custom or fine-pitch thread configurations are required.
Here is the exact breakdown of what #8-32 means:
1. The "#8" Represents the Major Diameter
The first number specifies the nominal outside diameter of the screw thread. For sizes smaller than 1/4 inch, the UTS system uses a numbering scale from #0 to #12.
- Physical Dimension: A #8 screw has a major outer diameter of 0.164 inches (approximately 4.17 mm).
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The Formula: You can calculate the diameter of machine screw numbers using the formula:
Diameter =(Screw Number X 0.013) + 0.060
Diameter =(8 X 0.013)+0.060 = 0.164 inches
2. The "32" Represents the Threads Per Inch (TPI)
The second number defines the thread pitch count.
- Thread Count: There are exactly 32 individual thread crests per inch of axial screw length.
- Thread Pitch: The distance from one thread peak to the next is 1/32 of an inch, which is 0.03125 inches (or 0.794 mm).
3. Thread Series Designation (UNC)
An #8-32 thread belongs to the UNC (Unified National Coarse) thread series. It is the most common thread pitch for a #8 screw size. (By contrast, the less common fine-thread version is a #8-36 UNF).
1. Taper Tap (Starter Tap)
The Taper Tap is designed to initiate the threading process.
- The Tip Chamfer: It features a long, gradual taper spanning 7 to 10 threads at the tip.
- The Purpose: Because of the long taper, the tool enters the pre-drilled hole effortlessly and ensures the thread starts perfectly straight and aligned. It distributes the cutting force across many teeth, making it very easy to turn.
- Limitation: It will not cut full, usable threads near the bottom of a hole because the tip is tapered down.
2. Plug Tap (Intermediate / Second Tap)
The Plug Tap is the most versatile and frequently used style of the three.
- The Tip Chamfer: It features a moderate taper spanning 3 to 5 threads at the tip.
- The Purpose: In open through-holes, a plug tap can often be used all by itself to cut the entire thread in one pass. In a blind hole, it is used second—following the Taper Tap—to cut the threads much deeper toward the floor.
- Limitation: Like the taper, it still leaves the bottom 3 to 5 threads incomplete.
3. Bottoming Tap (Finisher Tap)
The Bottoming Tap is used exclusively to finish a blind hole.
- The Tip Chamfer: It features a very short, aggressive taper of only 1 to 2 threads at the tip.
- The Purpose: It is used as the final step after the hole has already been pre-threaded by the Taper and Plug taps. It allows you to cut full, functional threads all the way down to the very floor of a dead-end hole.
- Limitation: Never try to start a fresh thread with a bottoming tap. Because it has almost no alignment lead-in, it takes immense force to turn, is highly likely to start crooked, and will easily snap.
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Exchange/Return Notes
- We offer a 30-day return/exchange service after receiving.
- Final sale items are not eligible for returns or exchanges.
- To process your return/exchange, please contact us at [email protected]
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Product Reviews
★★★★★ 1
Nothing but big for me, I need a small size
Color: White, Size: Medium
Good but very big for me I need S size
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Reviewed in the United States on August 31, 2025
★★★★★ 4
Buy them !
Color: Black, Size: X-Large
Great
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Reviewed in the United States on August 21, 2025
★★★★★ 5
Love Em!
Color: Black, Size: 3X-Small, Color: Black, Size: 3X-Small
Love it, already made a review for the blazer but the pants are just as fancy and fit great.
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Reviewed in the United States on November 9, 2025
★★★★★ 3
Great for a costume, but not for every day
Color: White, Size: Medium
I'm not sure what I was really expecting, but these pants made me feel like I was in the song zoot suit riot and/or Dick Tracy was trying to find me. They honestly just feel very costume-ish as opposed to being something dressy. I couldn't see myself wearing these to a job interview, which is kind of my standard for what qualifies as "dress clothes." However, they do fit quite well in the waist the and down the leg. I have a wide variety of clothing options, but I even find it difficult to pair anything with these pants.
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Reviewed in the United States on November 26, 2025
★★★★★ 5
The pinstripes
Color: Black, Size: Medium
Love the style!
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Reviewed in the United States on August 11, 2025