THREADS & FASTENERS - Exercise: Fastener tables and clearance holes

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Ex: Fastener tables and clearance holes

 

The objective of this exercise is to familiarize you with looking up information in the fastener tables.

 

Fill in the following information related to clearance holes and fasteners.

 

What is the normal fit clearance hole diameter for the following nominal bolt sizes?

 

Nominal size Clearance hole Check
1/4
3/4

 

 

A 5/16 - 18 UNC - Socket Head Cap Screw needs to go through a piece of metal in order to screw into a plate below. The head of the screw should be flush with the surface. Fill in the following table for a normal fit clearance hole. Refer to the Appendix in the Engineering Graphics Essentials Book.

 

  Enter Answer Check
Max. Head diameter
Max. Height of head
Clearance hole diameter
Counterbore diameter
Counterbore depth

 

 

An M8 x 1.25 Flat Countersunk Head Metric Cap Screw needs to go through a piece of metal in order to screw into a plate below. The clearance hole needs to be close and the head needs to go below the surface. What should the countersink diameter and clearance hole diameter be? Fill in the following table for a normal fit clearance hole. Refer to the Appendix in the Engineering Graphics Essentials Book.

 

  Enter Answer Check
Major diameter
Head diameter
Countersink diameter
Clearance hole diameter

 

 

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