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Hex Bolts Turned from Hex Bar
A hex bolt is hex bar with most of its length turned round and threaded: the part left hexagonal is the head. Held in a three-jaw chuck, the bar's flats become the spanner flats with no further work. Sizes follow ISO 4017; the notebook lists M6 to M10.
These are mild steel bolts. They are not a high-strength grade such as 8.8, which needs heat-treated alloy steel.
Intermediate
20 minutes per bolt
Instructions
1
1
Sizes
Sizes
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2
2
Chuck and face
Chuck and face
Grip the hex bar in the three-jaw chuck with the bolt's length plus head plus 10 mm sticking out, and face the end square.
Materials for this step:
Mild Steel Hex Bar0.3 meterTools needed:
Metal Lathe
Lathe Chuck 3-Jaw
Lathe Tool Set (HSS)
Safety Glasses3
3
Turn the shank
Turn the shank
Turn the shank round to a little under the nominal size, for the bolt's length, leaving the head's height plus the parting width as hex. Chamfer the end.
Materials for this step:
Cutting Oil5 mlTools needed:
Lathe Tool Set (HSS)
Digital Caliper 6-Inch4
4
Thread it
Thread it
With the lathe off and the chuck free to turn by hand, start the die square on the shank with oil and cut the thread to the length you need.
Materials for this step:
Cutting Oil5 mlTools needed:
Tap and Die Set
Die Stock5
5
Part off
Part off
Part the bolt off at the head height from the shank shoulder.
Tools needed:
Parting ToolMetal Lathe6
6
Finish the head
Finish the head
Grip the bolt by its shank in soft jaws, face the head and chamfer its corners. Test with a nut.
Tools needed:
Metal LatheLathe Tool Set (HSS)
Hex Nut7
7
Troubleshooting
Troubleshooting
Bolt turning troubleshooting.
Flow
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Materials
2- 0.3 meterPlaceholder
- 10 mlPlaceholder
Tools Required
9- Placeholder
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