Heavy Hex Head Bolts | McMaster-Carr

Filter by

System of Measurement

Thread Size

Length

Fastener Strength Grade/Class

Grip Length

Threading

Material

Head Width

Finish

Hot-Dipped Galvanized

Specifications Met

Thread Length

Tensile Strength

Thread Type

Thread Spacing

Thread Fit

Unified Standard Class 2A

Unified Standard Class 2B

Unified Standard Class 3A

DFARS Specialty Metals

Thread Pitch

Hardness

U.S.–Mexico–Canada Agreement (USMCA) Qualifying

Head Height

RoHS

REACH

Export Control Classification Number (ECCN)

Component

Pipe Size

For Flange Class

827 Products

About Hex Head Screws and Bolts

Choose a hex head fastener with the right threading, thread size, material, and strength for your equipment.

Hex Head Screws

Medium-Strength Steel Heavy Hex
Head Screws for Structural Applications

The most commonly used heavy hex head screw, these medium-strength steel screws are strong enough to join I-beams and scaffolding. They meet ASTM A325 and ASTM F3125 standards for structural applications.

Metric High-Strength Steel Heavy Hex
Head Screws for Structural Applications

Designed for construction, these metric screws are often used to join I-beams and scaffolding. They’re Class 10.9 steel, which is at least 25% stronger than medium-strength steel.

High-Strength Steel Heavy Hex Head
Screws for Structural Applications

About 25% stronger than medium-strength steel heavy hex head screws, these screws hold up to the high stress of joining I-beams and scaffolds. Also known as structural bolts, they meet ASTM A490 and F3125 standards for structural applications.

18-8 Stainless Steel Heavy Hex Head
Screws for High-Pressure Applications

Made of 18-8 stainless steel, these Grade B8 screws resist corrosion from mild chemicals and water. Also known as pressure bolts, these screws meet the high-pressure and high-temperature regulations of ASTM A193.

Super-Corrosion-Resistant 316
Stainless Steel Heavy Hex Head
Screws for High-Pressure Applications

Made from 316 stainless steel, these Grade B8M screws are more corrosion resistant than 18-8 stainless steel screws. Also known as pressure bolts, these screws meet the high-pressure and high-temperature regulations of ASTM A193.

Steel Heavy Hex Head Screws
for High-Pressure Applications

Made of Grade B7 steel, these screws are nearly twice as strong as Grade B8 and Grade B8M stainless steel screws. Also known as pressure bolts, they meet the high-pressure and high-temperature regulations of ASTM A193 and are used to secure pressure tanks, valves, and flanges.

Steel Heavy Hex Head Screws for
Low-Temperature Applications

Made from Grade L7 steel, these screws don’t become brittle in the cold, so they stand up to impact even at temperatures as low as -150° F.

Stainless Steel Heavy Hex Screw
and Nut Kits for Pipe Flanges

Connect standard-size stainless steel pipe flanges with these kits—they come with screws and nuts in the right size and number to match the bolt holes. The screw heads are 10% wider than a standard hex head, so they spread force over a larger area, and you can tighten with more torque.

Steel Heavy Hex Screw and Nut Kits for Pipe Flanges

Join standard-sized steel and cast iron pipe flanges—these kits come with the screws and nuts in the right size and number to match the bolt holes. The screw heads and nuts are 10% wider than standard hex fasteners, so they spread force over a larger area, and you can tighten with more torque.

Hex Head Screws

Medium-Strength Steel Heavy HexHead Screws for Structural Applications

Metric High-Strength Steel Heavy HexHead Screws for Structural Applications

High-Strength Steel Heavy Hex HeadScrews for Structural Applications

18-8 Stainless Steel Heavy Hex HeadScrews for High-Pressure Applications

Super-Corrosion-Resistant 316Stainless Steel Heavy Hex Head Screws for High-Pressure Applications

Steel Heavy Hex Head Screwsfor High-Pressure Applications

Steel Heavy Hex Head Screws forLow-Temperature Applications

Stainless Steel Heavy Hex Screwand Nut Kits for Pipe Flanges

Steel Heavy Hex Screw and Nut Kits for Pipe Flanges

Medium-Strength Steel Heavy Hex
Head Screws for Structural Applications

Metric High-Strength Steel Heavy Hex
Head Screws for Structural Applications

High-Strength Steel Heavy Hex Head
Screws for Structural Applications

18-8 Stainless Steel Heavy Hex Head
Screws for High-Pressure Applications

Super-Corrosion-Resistant 316
Stainless Steel Heavy Hex Head
Screws for High-Pressure Applications

Steel Heavy Hex Head Screws
for High-Pressure Applications

Steel Heavy Hex Head Screws for
Low-Temperature Applications

Stainless Steel Heavy Hex Screw
and Nut Kits for Pipe Flanges