Fraisa, one of the best mills in the world.
They have what you want and more.
http://www.fraisausa.com/product.php?id_product=1118
Shaft 20D ( means 20 times the diameter ) for diameter 1.2mm, which comes closest to the 0,045" you want.
But 15D probably is the best for you:
http://www.fraisausa.com/product.php?id_product=1112
Try using Toolexpert from Fraisa, it is the most comprehensive material database and for all the mills and materials it gives the cutting speeds, which are directly usable, i never broke one mill and use them on a daily basis for my work.
http://www.fraisa.com/CH/EN/NAV/NEWS...rsion-1-7.aspx