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IMPERIAL Knurled Socket Head Bolt Set

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Set of 55 IMPERIAL Knurled Socket Head Bolts in the Most Common Sizes
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updated May 31, 2026

Description

PDF

This set includes Knurled Socket Head Bolts in the following 55 IMPERIAL sizes (11 Thread Diameters × 5 Thread Lengths):

Thread Diameter

Len1

Len2

Len3

Len4

Len5

#4

#5

#6

#8

#10

1/4"

5/16"

3/8"

7/16"

1/2"

9/16"

1/4"

5/16"

3/8"

1/2"

5/8"

3/4"

1"

1-1/4"

1-1/2"

1-3/4"

2"

5/16"

3/8"

1/2"

5/8"

3/4"

1"

1-1/4"

1-1/2"

1-3/4"

2"

2-1/4"

3/8"

1/2"

5/8"

3/4"

1"

1-1/4"

1-1/2"

1-3/4"

2"

2-1/4"

2-1/2"

1/2"

5/8"

3/4"

1"

1-1/4"

1-1/2"

1-3/4"

2"

2-1/4"

2-1/2"

2-3/4"

5/8"

3/4"

1"

1-1/4"

1-1/2"

1-3/4"

2"

2-1/4"

2-1/2"

2-3/4"

3"

For each size, the corresponding STL file is available and can be downloaded by pressing the Download button.

🔹Example

For example,   40 - IMPERIAL Bolt Knurler Head 3-8 x 2 1-4 UNC.stl   indicates a bolt with:

  • 40= Progressive Number (used to keep the file list organized)

  • 3-8 = 3/8''  Thread diameter

  • 2 1-4 = 2-1/4''  Thread length

  • UNC = (Unified National Coarse)  Standard imperial thread commonly used for bolts and nuts.

🔹 Printing Notes

For smaller sizes or higher printing precision, a 0.1 mm layer height is recommended.

3D printed components have lower strength than metal parts and are intended for light-duty, non-structural applications.

You can find the full collection by clicking on this link:
https://www.printables.com/@AlexFreeNet_4570629/collections/3481128

Tags

diymechanicalengineeringhardwareworkshop

Model origin

The author marked this model as their own original creation.

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