The American Repertory of Arts, Sciences, and Manufactures
https://books.google.co.uk/books?id=H-crAQAAMAAJ
American Repertory - 1841
The lock-bolt has two notches cut in its upper part, one considerably longer than the other, being divided from each other by a small projection; there are likewise ...

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Note added at 46 mins (2015-06-15 18:03:21 GMT)
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pêne de la serrure - Traduction anglaise – Linguee
www.linguee.fr/francais-anglais/traduction/pêne de la serru...
verrou pour ouvrir le contenant, le pêne de la serrure glisse en position ... When the bolt works are disengaged to open the container, the lock bolt will slide [...].

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Note added at 53 mins (2015-06-15 18:10:17 GMT)
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from wiki

Barbe - Dents pratiquées à l'un des côtés du pêne d'une serrure, lesquelles étant accrochées par le panneton de la clef, ouvrent ou ferment la serrure selon qu'on tourne la clef - Il y à autant de barbes à un pêne que la serrure à de tours pour fermerS

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Note added at 58 mins (2015-06-15 18:15:37 GMT)
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oh
here
http://www.fvsb.de/asp/tbl_wb_moeb2.asp?wbpg=8

barbe = lath

Schlossfalle a) Fallenkopf, b) Fallenschaft c) Fallenschluss
gb Double shoot bolt a) bolt head, b) double shoot c) bolt lath
fr Pène de serrure a) tête de pène à demi-tour b) queue de pène c) barbe
es Picaporte a) cabeza de picaporte, b) pala c) cremallera
it Catenaccio a scatto e mandata a) testa b) corpo c) frastaglia

just checking

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Note added at 1 hr (2015-06-15 18:53:29 GMT)
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Lexique de la serrurerie — Wikipédia
fr.wikipedia.org/wiki/Lexique_de_la_serrurerie
Translate this page
La serrurerie, métier du serrurier s'occupe de serrures, quincailleries, et autres .... Bandelette - Voir Fer; ***Barbe - Dents pratiquées à l'un des côtés du pêne*** d'une ...

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Note added at 1 hr (2015-06-15 18:58:03 GMT)
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so,
barbes = teeth

Lexicon of locks and keys - Historical locks
www.historicallocks.com/en/site/h/historicallocks/dictionar...
Any part of a lock that transfers the movement of the key to the bolt. ...... The key was inserted through a hole in the door and the teeth on its bit moved the bolt.
Keys - Roman Locks
romanlocks.com/Keys.htm
Key 385 Iron with two parallel rows of three teeth, which is quite a lot for this ..... The Celts did use primitive locks, bolts and keys, but not many have turned up.

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Note added at 1 hr (2015-06-15 19:00:07 GMT)
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so

final answer

bolt with two teeth/barbs