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Slotted Machine Screws Turned from Round Bar
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Yenziwe ngu-

Forge

11. uMfumfu 2026NO
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Slotted Machine Screws Turned from Round Bar

Small machine screws with a slotted cheese head are turned from round bar: the head is the bar's own diameter, the shank is turned down and threaded, and a slot is sawn across the head. The example is M4 to ISO 1207: head 7 mm across and 2.6 mm high, slot 1.2 mm wide and at least 1.1 mm deep.
Ophakathi
15 minutes per screw

Imiyalelo

1

Turn the head diameter

Chuck mild steel round bar and turn the end to 7 mm for a length of 20 mm more than the screw.

Izinto zokwakha zalesi sinyathelo:

Induku eyindilinga yensimbi ethambileInduku eyindilinga yensimbi ethambile0.2 imitha

Amathuluzi adingekayo:

Umshini Wokuphendula InsimbiUmshini Wokuphendula Insimbi
Isibambi somshini wokuphenda esinemilomo emithathuIsibambi somshini wokuphenda esinemilomo emithathu
Isethi yamathuluzi e-lathe (HSS)Isethi yamathuluzi e-lathe (HSS)
I-Caliper Yedijithali Yamayintshi Ayi-6I-Caliper Yedijithali Yamayintshi Ayi-6
Izibuko zokuphephaIzibuko zokuphepha
Uwoyela wokusikaUwoyela wokusika
2

Turn the shank

Turn the shank a little under 4 mm, leaving 2.6 mm of head plus the parting width. Chamfer the end.

Amathuluzi adingekayo:

Isethi yamathuluzi e-lathe (HSS)Isethi yamathuluzi e-lathe (HSS)
I-Caliper Yedijithali Yamayintshi Ayi-6I-Caliper Yedijithali Yamayintshi Ayi-6
3

Thread M4

With the lathe off, cut the M4 x 0.7 thread with the die and oil.

Amathuluzi adingekayo:

Isethi yokusika izikulufuIsethi yokusika izikulufu
Isibambo sokusika ngaphandleIsibambo sokusika ngaphandle
Uwoyela wokusikaUwoyela wokusika
4

Part off

Part the screw off 2.6 mm behind the shank shoulder and round the head's edge with a file.

Amathuluzi adingekayo:

Insimbi yokuhlukanisa emshinini wokuphothaInsimbi yokuhlukanisa emshinini wokuphotha
Iqoqo LamafayelaIqoqo Lamafayela
5

Saw the slot

Hold the screw in soft vise jaws and saw a slot straight across the head, 1.2 mm wide and at least 1.1 mm deep. Deburr it.

Amathuluzi adingekayo:

Isaha SensimbiIsaha Sensimbi
Isibambo SebhentshiIsibambo Sebhentshi
Iqoqo LamafayelaIqoqo Lamafayela
I-Caliper Yedijithali Yamayintshi Ayi-6I-Caliper Yedijithali Yamayintshi Ayi-6
6

Troubleshooting

Machine screw troubleshooting.

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Izinto

1

Amathuluzi Adingekayo

12

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