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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).
-
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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★★★★★ 3
Runs large for a slim fit
Color: Black 02, Size: Large
I followed the size guide and ended up with an item that was to large in all areas. It did not fit like a slim fit. The fabric is odd and does not feel great against the skin. I love the design. I really wish it would have worked.
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Reviewed in the United States on April 30, 2026
★★★★★ 5
Prom 2026
Color: Blue 02, Size: Medium, Color: Blue 02, Size: Medium
Perfect fit true to size
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Reviewed in the United States on April 29, 2026
★★★★★ 4
Not true to size but great quality.
Color: Black 02, Size: Medium
I bought a medium for my son who normally wears medium. It was extremely big. The quality and arm length was good.
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Reviewed in the United States on May 5, 2026
★★★★★ 5
Show stopper!
Size: X-Small, Color: Blue-2 Pieces, Size: X-Small, Color: Blue-2 Pieces
This jacket is everything! My son wore it to his football banquet and it looked amazing. I was worried because he is big for his age and although he can wear men sizes, they can sometimes be too long in the arms. This jacket did not disappoint. It fit his arms well, buttoned up nice and was a great length. It was a nice feel and was not overbearing and thick, but made well. He did a lot of moving around but had no issue with feeling tight it’s certain movements or any rip. I would definitely recommend, money well spent. For reference, my son is 5’1 and 125 pounds. We got a size XS.
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Reviewed in the United States on April 15, 2025
★★★★★ 5
Perfect for Prom
Size: Large, Color: Black-2 Pieces
Pants fit a little big but perfect for alterations needed! Great quality
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Reviewed in the United States on April 20, 2026