MCKAY CO HIN Decoder
Hull Identification Numbers beginning with TNH were assigned by the US Coast Guard to MCKAY CO of ARLINGTON, WA. The company is recorded as out of business since 1988 — common for older hulls, and useful to know when hunting parts or records. Enter the full 12-character HIN below for build date, model year, and serial — free, no account.
MIC
TNH
Location
ARLINGTON, WA
In business
since 1980
Status
Out of business (1988)
MCKAY CO built hulls across both HIN eras (1980–1988): boats before August 1984 carry legacy straight-year or model-year date codes; later hulls use the current month-letter format. The decoder handles all three.
Free · no account · the HIN is on the transom, upper starboard (right) corner
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MCKAY CO HIN FAQ
What does a MCKAY CO HIN look like?
It starts with the three characters "TNH" — the Manufacturer Identification Code the US Coast Guard assigned to MCKAY CO — followed by a 5-character hull serial and a 4-character date code, 12 characters total. MCKAY CO built hulls across both HIN eras (1980–1988): boats before August 1984 carry legacy straight-year or model-year date codes; later hulls use the current month-letter format. The decoder handles all three.
Is MCKAY CO still in business?
USCG records list MCKAY CO as out of business since 1988. That's common for older hulls — the HIN still decodes normally, and the out-of-business date helps date the boat and guides parts-hunting toward salvage and owner groups rather than a dealer network.
How do I decode the year on a MCKAY CO HIN?
On current-format HINs the last two characters are the model year and the 9th–10th encode the certification month and year. MCKAY CO built hulls across both HIN eras (1980–1988): boats before August 1984 carry legacy straight-year or model-year date codes; later hulls use the current month-letter format. The decoder handles all three. Enter the full 12-character HIN above and the decoder works it out, including the legacy formats.
Other builders in WA
Sources: USCG Manufacturer Identification Code database (uscgboating.org, refreshed monthly) · HIN format per 33 CFR 181 subpart C. Cite this page: CarWhere, "MCKAY CO HIN Decoder," carwhere.com/hin-decoder/tnh, last verified 2026-06-12.