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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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4.6 ★★★★★
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Product Reviews
★★★★★ 5
WOULD BUY AGAIN.
EASY TO PUT TOGETHER. WORKS EXATCLY AS i NEEDED. I USED ONLY 3 PANELS.
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Reviewed in the United States on April 29, 2026
★★★★★ 5
Great for closing off areas of my apt
Size: 6 Panel-120"W, Color: Beige
I love this...I ordered the larger size and it's great. It's a little wobbly however
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Reviewed in the United States on January 11, 2026
★★★★★ 5
Very nice!
Color: Black, Size: Four Panel
Great inexpensive screen! It was easy to put together and works perfectly for what it was purchased for.
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Reviewed in the United States on December 16, 2025
★★★★★ 5
It works perfectly for what I needed it for.
Color: Black, Size: Four Panel
Easy to assemble. Nice size in width and height. Perfect divider for our bedroom downstairs. Like the flexibility of having it straight or can use it in an accordion style.
Lightweight and sturdy.
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Reviewed in the United States on August 30, 2025
★★★★★ 4
Do NOY buy used.
4th time buying this, and thank god I did. Bought this last one as "used-like new"... instructions are missing, 4 screws are missing, the present ones were loose in the box, and the cloth panels are I-balled-them-up-and-used-them-to-play-basketball wrinkled. Do NOT buy this used. It's only because I had leftover parts and previous knowledge that I was able to assemble this.
On to product. Super lightweight, easy assembly, looks pretty clean up close and from a distance. Panels stay on bars via velcro. This is not a sturdy screen, so it's not for a kid's room. But if you want a room divider that has no other job than to divide with quiet dignity, it works.
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Reviewed in the United States on March 31, 2024