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Wing Nut: Sand-Cast in Brass, Drilled and Tapped
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18. Ukwakira 2026NO
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Wing Nut: Sand-Cast in Brass, Drilled and Tapped

A wing nut has two wings so it can be turned by hand without tools. The standard (ASME B18.6.9) sorts them by how they are made: cold forged, hot forged, die cast or stamped from sheet. In a workshop the cast kind can be made by sand casting brass from a wooden pattern, then drilling and tapping the hole. Method and sizes are ours. The picture: our drawing.
Hagati
1 day

Amabwiriza

1

Make the pattern

Saw and file a hardwood pattern: a round boss 16 mm across and 12 mm high with two flat wings rising from opposite sides, 40 mm tip to tip. Taper every face a little so it draws from the sand. Make several nuts at once from one mould.

Ibikoresho bikenewe:

Igihimba cy'Igiti GikomeyeIgihimba cy'Igiti Gikomeye
Umucumita w'ImigororwaUmucumita w'Imigororwa
Amakariso MenshiAmakariso Menshi
Ikigereranyo cya Digitale cy'Amasentimetero 6Ikigereranyo cya Digitale cy'Amasentimetero 6
2

Ram the mould

Ram the patterns up in the flask, draw them, and cut a sprue and runners to each cavity.

Ibikoresho bikenewe:

Umucanga wo guteraUmucanga wo gutera
Agasanduku ko kubumbamoAgasanduku ko kubumbamo
Isuka NtoyaIsuka Ntoya
3

Melt and pour

Melt the brass in a clay crucible in the furnace and pour the mould full in one go. Let it cool.

Ibikoresho by'iyi ntambwe:

Ikirundo cy'umuringa w'umuhondoIkirundo cy'umuringa w'umuhondo300 g
AmakaraAmakara1 as required

Ibikoresho bikenewe:

Ikirahure cy'Ibumba KirekireIkirahure cy'Ibumba Kirekire
Itanura ry'amatafariItanura ry'amatafari
UmuvubaUmuvuba
Amakoro y'Icyombo GishongeshaAmakoro y'Icyombo Gishongesha
Uturindantoki two gukomeza ibyumaUturindantoki two gukomeza ibyuma
Ikanzu y'uruhuIkanzu y'uruhu
Ingabo y'IsuraIngabo y'Isura
4

Clean up

Shake out, saw off the runners and file the wings smooth and the boss faces flat.

Ibikoresho bikenewe:

Umucumita w'IbyumaUmucumita w'Ibyuma
Ifatiro ry'AmezaIfatiro ry'Ameza
Amakariso MenshiAmakariso Menshi
5

Drill and tap

Drill the boss through square to its face with the tapping drill for M8 (6.8 mm), then tap M8 with cutting oil. Check it runs on M8 threaded rod.

Ibikoresho bikenewe:

Icyuma Cyivumbura GihagazeIcyuma Cyivumbura Gihagaze
Ibyuma Byinshi byo GucukuraIbyuma Byinshi byo Gucukura
Ifatiro ry'AmezaIfatiro ry'Ameza
Agakoresho ko gukata imizingo y'ibyumaAgakoresho ko gukata imizingo y'ibyuma
Igifashi cyo guhindukiza umuyoboro wo hasiIgifashi cyo guhindukiza umuyoboro wo hasi
Amavuta yo gukataAmavuta yo gukata
Inkoni ifite imirongoInkoni ifite imirongo
Amadarubindi y'umutekanoAmadarubindi y'umutekano

Ibikoresho

2

Ibikoresho bikenewe

23

Iki gishushanyo gikora

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Brass Fittings: Sand-Cast on a Core, Then Tapped

Brass Fittings: Sand-Cast on a Core, Then Tapped

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