Hi Nuts

A hi nut (high nut) is a taller-than-standard hex nut. The extra height gives more thread engagement — useful for developing full strength on a stud, chasing or protecting damaged threads, providing a longer grip on threaded rod, or acting as a coupling-style extension. Eugene Fastener & Supply stocks hi nuts in steel and stainless, in common threads.

Where a standard nut may not give enough engagement — soft base material, high load, or a few damaged threads to clear — a hi nut adds length without changing the wrench size pattern. By the piece or in bulk, same-day shipping before 2pm Pacific.

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Hi Nuts — Extra-Height Hex Nuts

Need these for a production run or a specific size?

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When to Use a Hi Nut

Reach for a hi nut when you need more thread engagement than a standard hex nut provides: full strength on a stud in soft material, a longer grip on all-thread, or to run past and protect a few damaged threads. For joining two full lengths of rod end to end, a coupling nut is the better choice; a hi nut is for added engagement on a single connection.

FAQ

What is a hi nut?

A hi nut is a high (tall) hex nut with more height than a standard hex nut, giving extra thread engagement. It is used for full strength on studs, longer grip on threaded rod, and chasing or protecting damaged threads.

What is the difference between a hi nut and a coupling nut?

Both are taller than a standard nut. A hi nut adds thread engagement on a single connection; a coupling nut is sized to join two separate pieces of threaded rod end to end with a center sight hole.

When do I need extra thread engagement?

In soft base materials, high-load joints, or when a stud is short on threads. More engagement spreads load over more threads and reduces the chance of stripping.

What materials are hi nuts available in?

Steel and stainless in common inch threads. Contact us for a specific size or material.

Why Buy from Eugene Fastener

  • By the piece or in bulk, with cross-reference help.
  • Same-day shipping on orders placed before 2pm Pacific.
  • Since 1969 — serving Pacific Northwest manufacturers, contractors, and equipment makers for over 55 years.

Browse all nut types or contact our sales team for sizing, cross-references, or bulk pricing. Eugene Fastener & Supply — serving the Pacific Northwest since 1969.

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