The Hex Tap Bolts are standard bolts that are fully threaded. They have a wide variety of applications and are versatile for maintenance and repair workers. The term “Tap Bolt” refers to a Hex Head Bolt that is threaded to the head. The added thread guarantees a fit to a variety of grip ranges for any job. Zirks' line of Hex Tap Bolts is found in Grade 5 and 8 to ensure the proper strength in every application.

Hex Tap Bolt – Grade 5

Versatile uses in maintenance and repair applications
Fully threaded to fit a variety of grip ranges
Available in fine thread
Diameter to 1”:
120,000 psi min tensile strength
85,000 psi min proof load strength
Rockwell hardness of Rc 25/34
Diameters less than 1”:
105,000 psi min tensile strength
74,000 psi min proof load strength
Rockwell hardness of Rc 19/30
Diameter sizes range from 1/4” to 1 1/4"
Meets ANSI B18.2.1 standards

Hex Tap Bolt – Grade 8

Versatile uses in maintenance and repair applications
Fully threaded to fit a variety of grip ranges
Available in fine thread
Rockwell hardness of Rc 33/39
All sizes:
150,000 psi min tensile strength
120,000 psi min proof load strength
Size range from 1/4” to 1 1/4"
Meets ANSI B18.2.1 standards

Serrated Flange Screws, Hex Flange Lock Bolts, or Whiz-lock Bolts are designed with a built-in washer underneath the head of the bolt — distributing the clamping load over a wider area. This eliminates the need for a separate washer, as it provides the same holding power. Engineered with quality in mind, Zirks' Flange Bolts are made to Property Class 10.9 standard to provide the durability and strength. These two-in-one bolts are popularly used to secure truck frames with ease, as well as many other applications.

Serrated Flange (Whiz-Lock™ Bolt, Whiz-Lock™ Screw) – Grade 8 and 120M case hardened

Built-in serrated washers prevent loosening in high-vibration applications
Teeth lock the bolt and stop it from backing out
120M case-hardened bolt creates durable teeth that won’t wear out
Grade 8 are through hardened to Rockwell hardness of Rc 33/39
Diameter sizes range from 1/4” to 5/8”
Meets ASME B18.2.1 standards

The Hex Tap Bolts are standard bolts that are fully threaded. They have a wide variety of applications and are versatile for maintenance and repair workers. The term “Tap Bolt” refers to a Hex Head Bolt that is threaded to the head. The added thread guarantees a fit to a variety of grip ranges for any job. Zirks' line of Hex Tap Bolts is found in Grade 5 and 8 to ensure the proper strength in every application.

Hex Tap Bolt – Grade 5

Versatile uses in maintenance and repair applications
Fully threaded to fit a variety of grip ranges
Available in fine thread
Diameter to 1”:
120,000 psi min tensile strength
85,000 psi min proof load strength
Rockwell hardness of Rc 25/34
Diameters less than 1”:
105,000 psi min tensile strength
74,000 psi min proof load strength
Rockwell hardness of Rc 19/30
Diameter sizes range from 1/4” to 1 1/4"
Meets ANSI B18.2.1 standards

Hex Tap Bolt – Grade 8

Versatile uses in maintenance and repair applications
Fully threaded to fit a variety of grip ranges
Available in fine thread
Rockwell hardness of Rc 33/39
All sizes:
150,000 psi min tensile strength
120,000 psi min proof load strength
Size range from 1/4” to 1 1/4"
Meets ANSI B18.2.1 standards

Serrated Flange Screws, Hex Flange Lock Bolts, or Whiz-lock Bolts are designed with a built-in washer underneath the head of the bolt — distributing the clamping load over a wider area. This eliminates the need for a separate washer, as it provides the same holding power. Engineered with quality in mind, Zirks' Flange Bolts are made to Property Class 10.9 standard to provide the durability and strength. These two-in-one bolts are popularly used to secure truck frames with ease, as well as many other applications.

Serrated Flange (Whiz-Lock™ Bolt, Whiz-Lock™ Screw) – Grade 8 and 120M case hardened

Built-in serrated washers prevent loosening in high-vibration applications
Teeth lock the bolt and stop it from backing out
120M case-hardened bolt creates durable teeth that won’t wear out
Grade 8 are through hardened to Rockwell hardness of Rc 33/39
Diameter sizes range from 1/4” to 5/8”
Meets ASME B18.2.1 standards

Serrated Flange Screws, Hex Flange Lock Bolts, or Whiz-lock Bolts are designed with a built-in washer underneath the head of the bolt — distributing the clamping load over a wider area. This eliminates the need for a separate washer, as it provides the same holding power. Engineered with quality in mind, Zirks' Flange Bolts are made to Property Class 10.9 standard to provide the durability and strength. These two-in-one bolts are popularly used to secure truck frames with ease, as well as many other applications.

Serrated Flange (Whiz-Lock™ Bolt, Whiz-Lock™ Screw) – Grade 8 and 120M case hardened

Built-in serrated washers prevent loosening in high-vibration applications
Teeth lock the bolt and stop it from backing out
120M case-hardened bolt creates durable teeth that won’t wear out
Grade 8 are through hardened to Rockwell hardness of Rc 33/39
Diameter sizes range from 1/4” to 5/8”
Meets ASME B18.2.1 standards

Serrated Flange Screws, Hex Flange Lock Bolts, or Whiz-lock Bolts are designed with a built-in washer underneath the head of the bolt — distributing the clamping load over a wider area. This eliminates the need for a separate washer, as it provides the same holding power. Engineered with quality in mind, Zirks' Flange Bolts are made to Property Class 10.9 standard to provide the durability and strength. These two-in-one bolts are popularly used to secure truck frames with ease, as well as many other applications.

Serrated Flange (Whiz-Lock™ Bolt, Whiz-Lock™ Screw) – Grade 8 and 120M case hardened

Built-in serrated washers prevent loosening in high-vibration applications
Teeth lock the bolt and stop it from backing out
120M case-hardened bolt creates durable teeth that won’t wear out
Grade 8 are through hardened to Rockwell hardness of Rc 33/39
Diameter sizes range from 1/4” to 5/8”
Meets ASME B18.2.1 standards