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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.
中级
20 minutes per bolt
说明
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.
此步骤所需材料：
低碳钢六角棒0.3 米所需工具：
金属车床
三爪车床卡盘
车床刀具套装（HSS）
安全眼镜3
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.
此步骤所需材料：
切削油5 毫升所需工具：
车床刀具套装（HSS）
6 英寸数显卡尺4
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.
此步骤所需材料：
切削油5 毫升所需工具：
丝锥板牙套装
板牙架5
5
Part off
Part off
Part the bolt off at the head height from the shank shoulder.
所需工具：
车床切断刀金属车床6
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.
所需工具：
金属车床车床刀具套装（HSS）
六角螺母7
7
Troubleshooting
Troubleshooting
Bolt turning troubleshooting.
Flow
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