Heavy Hex Bolts

1,155 products

Heavy hex bolts are sold by the Bulk Box. Shop A325 and A490 heavy hex structural bolts, B7 alloy steel, A307 low carbon steel and 18-8 stainless heavy hex bolts from 1/2" to 2-1/2" diameter. Filter by diameter, length, grade and finish.

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What is a heavy hex bolt?

A heavy hex bolt has a larger hex head than a standard hex bolt of the same diameter. For example, a 1/2" heavy hex bolt takes a 7/8" wrench, while a standard 1/2" hex bolt takes a 3/4" wrench. The larger head gives more bearing surface. Heavy hex is the standard head for A325 and A490 structural bolts.

Choose the grade

  • A325 structural bolts: heavy hex structural bolts from 1/2" to 1-1/4" diameter, plain or hot-dip galvanized. See all structural bolts.
  • A490 heavy hex bolts: structural bolts from 5/8" to 1-1/4" diameter. A490 is a higher-strength structural grade than A325. A490 bolts are plain finish (A490 is not galvanized). Use the grade your drawings call for.
  • B7 alloy steel: heavy hex bolts in B7 steel from 1/2" to 1-1/4", in partial-thread and full-thread versions. For threaded rod in the same grade, see B7 studs.
  • A307 low carbon steel: general-purpose heavy hex bolts from 1/2" to 1-1/2", plain, zinc or hot-dip galvanized.
  • Large diameters: alloy steel from 1-1/8" to 2-1/2", and Grade 5 at 2", in lengths up to 18".
  • 18-8 stainless: 18-8 stainless, passivated (3/8" and 1/2").

Thread and size callouts

Heavy hex bolts are listed as diameter-threads per inch x length, for example 3/4"-10 x 3" or 1"-8 x 4". Most are coarse thread. Some larger sizes are 8-pitch, for example 1-1/4"-8. B7 bolts are listed as partial thread or full thread. Check the product title.

Finish

Finishes include plain, zinc and hot-dip galvanized steel. Stainless is passivated. Plain steel has no coating. Hot-dip galvanizing adds a thick zinc coating for outdoor and wet exposure. Use galvanized nuts and washers with galvanized bolts, and keep to one coating process: don't mix hot-dip and mechanically galvanized parts.

Length

Bolt length is measured from under the head to the end of the bolt. Stocked lengths run from 1-1/4" to 18" depending on diameter and grade.

Nuts and washers

Pair heavy hex bolts with heavy hex nuts. A heavy hex nut uses the same wrench size as the heavy hex bolt head on structural sizes. Add flat washers as the joint requires.

Bulk boxes

Heavy hex bolts are sold by the Bulk Box. Bulk box counts depend on size. Need volume pricing? See wholesale.

Heavy hex bolt grades and sizes

Grade / materialDiametersLengthsFinishes
A325 structural1/2" to 1-1/4"1-1/4" to 12"Plain, hot-dip galvanized
A490 structural5/8" to 1-1/4"1-1/2" to 10"Plain
B7 alloy steel1/2" to 1-1/4"1-1/2" to 10"Plain
A307 (low carbon steel)1/2" to 1-1/2"1-1/4" to 9"Plain, zinc, hot-dip galvanized
Alloy steel (large diameter)1-1/8" to 2-1/2"2-1/2" to 18"Plain
18-8 stainless3/8" to 1/2"2" to 2-1/4"Passivated

Heavy hex bolt FAQs

What is the difference between a heavy hex bolt and a hex bolt?

A heavy hex bolt has a larger head than a standard hex bolt of the same diameter. It needs a larger wrench, for example 7/8" instead of 3/4" on a 1/2" bolt. Heavy hex is the standard head for A325 and A490 structural bolts.

What is the difference between A325 and A490 heavy hex bolts?

Both are heavy hex structural bolts. A490 is the higher-strength grade. A325 is stocked from 1/2" to 1-1/4" diameter, plain or hot-dip galvanized. A490 is stocked from 5/8" to 1-1/4". A490 is plain finish only. Use the grade your drawings specify.

What size wrench fits a heavy hex bolt?

On structural sizes, 1/2" takes 7/8", 5/8" takes 1-1/16", 3/4" takes 1-1/4", 7/8" takes 1-7/16" and 1" takes 1-5/8". The matching heavy hex nut uses the same wrench. See the wrench size chart for more.

What sizes do heavy hex bolts come in?

Diameters run from 1/2" to 2-1/2" and lengths from 1-1/4" to 18", depending on grade. A325 runs 1/2" to 1-1/4". B7 and A490 run up to 1-1/4". Alloy steel covers 1-1/8" to 2-1/2".

Do you sell galvanized heavy hex bolts?

Yes. A325 structural bolts and A307 bolts come hot-dip galvanized. Use galvanized nuts from the same coating process.

Are heavy hex bolts sold in bulk?

Yes. Heavy hex bolts are sold by the bulk box; counts vary by size. See wholesale for volume pricing.

Related categories

Structural Bolts1,503 partsHex Bolts1,325 partsHeavy Hex Nuts377 partsB7 Studs225 partsFlat Washers1,872 partsHot-Dip Galvanized1,761 parts
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