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Next Gen Hero > Blog > Technology > UNC and UNF Nut Dimensions
Technology

UNC and UNF Nut Dimensions

Maria Martinez
Last updated: 2022/12/17 at 8:37 AM
Maria Martinez 6 months ago
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In this article, we will be discussing the UNC and UNF Nut Dimensions in mm and inches. They follow the ISO standardization [ISO (the International Organization for Standardization)]. Let’s get right into it.

Contents
UNC and UNF ThreadsDifference Between UNC and UNF ThreadsDimensions in mm and inchesI. UNC – Unified Coarse ThreadsII. UNF – Unified National Fine Threads

UNC and UNF Threads

The UNC Thread stands for Unified National Coarse Thread, comparable to the ISO metric thread, and the UNF thread stands for Unified National Fine Thread.

UNF and UNC are symbols for the Unified Screw Thread Series, standardized with gauge and determined based on the number of threads per inch. Compared to UNC threads, UNF threads are Unified fine-pitch threads. Both UNF and UNC thread screws are utilized for fastening; however, they are primarily employed in various industries.

unc

Difference Between UNC and UNF Threads

UNF threads differ from UNC threads because they have fewer threads per unit of distance. Let’s see more differences between the two:

UNC ThreadUNF Thread
The UNC thread is better suited to handling higher tensile and impact forces because it has fewer teeth of the same length and a bigger cross-section size for each tooth.UNF threads are used when sealing is required because they have a narrower pitch and more teeth screwed into the same thread length.
A coarse screw thread is stronger and more interchangeable than a fine screw thread.A fine screw thread is slightly weaker than a coarse thread.
UNC bolts’ coarse threads are adaptable, durable, and frequently used in general-purpose, lower-tolerance applications.The UNF threads are better tight and have a lower helix angle. It is generally used for thin-walled parts and parts with higher anti-vibration requirements.
Greater tolerances, better production, and plating capabilities are all advantages of UNC threading over UNF threading.With tolerances and production, UNC takes over UNF threads.

Dimensions in mm and inches

I. UNC – Unified Coarse Threads

UNC threads according to ANSI B1.1:

Major Diameter
(inches)
Threads per inch
(tpi)
Major Diameter
(mm)
Major Diameter
(inches)
Tap Drill Size
(mm)
Pitch
(mm)
#1 – 64641.8540.0731.500.397
#2 – 56562.1840.0861.800.453
#3 – 48482.5150.0992.100.529
#4 – 40402.8450.1122.350.635
#5 – 40403.1750.1252.650.635
#6 – 32323.5050.1382.850.794
#8 – 32324.1660.1643.500.794
#10 – 24244.8260.1904.001.058
#12 – 24245.4860.2164.651.058
1/4″ – 20206.3500.2505.351.270
5/16″ – 18187.9380.3136.801.411
3/8″ – 16169.5250.3758.251.587
7/16″ – 141411.1120.4389.651.814
1/2″ – 131312.7000.50011.151.954
9/16″ – 121214.2880.56312.602.117
5/8″ – 111115.8750.62514.052.309
3/4″ – 101019.0500.75017.002.540
7/8″ – 9922.2250.87520.002.822
1″ – 8825.4001.00022.853.175
1 1/8″ – 7728.5751.12525.653.628
1 1/4″ – 7731.7501.25028.853.628
1 3/8″ – 6634.9251.37531.554.233
1 1/2″ – 6638.1001.50034.704.233
1 3/4″ – 5544.4501.75040.405.080
2″ – 4 1/24 1/250.8002.00046.305.644
2 1/4″ – 4 1/24 1/257.1502.25052.655.644
2 1/2″ – 4463.5002.50058.506.350
2 3/4″ – 4469.8502.75064.756.350
3″ – 4476.2003.00071.106.350
3 1/4″ – 4482.5503.25077.456.350
3 1/2″ – 4488.9003.50083.806.350
3 3/4″ – 4495.2503.75090.156.350
4″ – 44101.6004.00096.506.350

II. UNF – Unified National Fine Threads

UNF threads ANSI B1.1:

Major Diameter
(inches)
Threads per inch
(tpi)
Major Diameter
(mm)
Major Diameter
(inches)
Tap Drill Size
(mm)
Pitch
(mm)
#0 – 80801.5240.0601.250.317
#1 – 72721.8540.0731.550.353
#2 – 64642.1840.0861.900.397
#3 – 56562.5150.0992.150.453
#4 – 48482.8450.1122.400.529
#5 – 44443.1750.1252.700.577
#6 – 40403.5050.1382.950.635
#8 – 36364.1660.1643.500.705
#10 – 32324.8260.1904.100.794
#12 – 28285.4860.2164.700.907
1/4″ – 28286.3500.2505.500.907
5/16″ – 24247.9380.3136.901.058
3/8″ – 24249.5250.3758.501.058
7/16″ – 202011.1120.4389.901.270
1/2″ – 202012.7000.50011.501.270
9/16″ – 181814.2880.56312.901.411
5/8″ – 181815.8750.62514.501.411
3/4″ – 161619.0500.75017.501.587
7/8″ – 141422.2250.87520.401.814
1″ – 121225.4001.00023.252.117
1 1/8″ – 121228.5751.12526.502.117
1 1/4″ – 121231.7501.25029.502.117
1 3/8″ – 121234.9251.37532.752.117
1 1/2″ – 121238.1001.50036.002.117

Also, read ISO 4033 Nut Dimensions | All You Need To Know

Maria Martinez December 14, 2022
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Maria Martinez
By Maria Martinez
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Maria Martinez is a very ambitious young writer who is almost done with her first book. She has been busy writing novels, but she wants to expand her knowledge and learn how to self-publish. Maria always strives to learn and improve, so she will be a great asset to the next gen hero team.
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