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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.
Shipping Notes
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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]
- Please click here for more details>>> Return & Exchange Policy
4.7 ★★★★★
Based on 16 reviews
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Product Reviews
★★★★★ 5
Great value for a one-time event! Perfect for graduation.
Color: Black, Size: Large, Color: Black, Size: Large
I bought this suit for my son's graduation, and it was exactly what we needed. Since he will probably only wear it once, I didn't want to spend a fortune at a high-end department store. For the price, the quality is surprisingly good; it looked sharp and he received a lot of compliments during the ceremony. We ordered a size Large (L) based on their sizing chart, and it was true to size and fit him perfectly. The fabric is lightweight but doesn't look cheap at all, making this a fantastic, excellent cost-benefit choice if you are looking for an option for a one-time event. Highly recommended!
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Reviewed in the United States on May 18, 2026
★★★★★ 5
Great for the price.
Color: Black, Size: Large, Color: Black, Size: Large
I’m 220lbs 6’1 athletic build. Arms/back couldn’t fit inside the jacket. Pants and vest fit fine though. I honestly should get stuff tailored considering my body competition. Good quality for the price worked for me.
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Reviewed in the United States on April 27, 2026
★★★★★ 4
XL sized suit review
Color: Light Blue, Size: X-Large
I ordered XL for my husband who is 6'1" and weighs 200 lbs. The pants' length was too long and we had to cut off two inches and get them hemmed. Jacket could be a little bigger in the mid section and shoulders but vest fit well. Could do without the fake handkerchief in the suit jacket pocket. Still liked the style and the color of the light blue suit.
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Reviewed in the United States on June 1, 2026
★★★★★ 5
Perfect for teens
Color: Black, Size: XX-Large
Great suit! Great quality for the price. Very impressed. Bought for my teens. Didn't want to spend a lot on something they won't wear more than a couple times before they grow again. This suit is great. A tad long in the arms and legs. But overall, its perfect. Fitting suit, but got a size larger for their comfort. Surprised at the quality, my mom was impressed and she knows suits.
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Reviewed in the United States on March 29, 2026
★★★★★ 5
Great suit!
Color: Black, Size: Medium
Looks super nice! For the price, it is definitely worth it. The fabric looks and feels great and the size range is good.
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Reviewed in the United States on May 9, 2026
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