Who is hayhaynes international? Haynes International, Inc., headquartered in Kokomo, Indiana, USA, is a leading developer, manufacturer and marketer of high-performance nickel-and cobalt-based alloys used in corrosion and high-temperature applications.Where are the haynes international offices located? Haynes International has offices in Kokomo, Arcadia, Hendersonville, Houston and in 12 other locations. How many offices does Haynes International have? Haynes International has 18 offices.How do i contact haynes customer service? If you have a Non-Technical question and you want to talk to a Haynes representative, you are able to contact us by phone. During normal business hours during the week (7:30AM to 4:30PM PST Monday-Thursday and through 3:30PM PST on Friday), you can call Haynes Customer Service at 1-800-442-9637 (US Customers).How do i get a copy of a haynes manual? For a Manual Online (Electronic version) Please email us at [email protected] or call (during regular business hours Monday-Thursday 7:30AM-4:30PM PST and through 3:30PM PST on Friday) at 1-800-442-9637. For a Printed Manual Please email us at [email protected]