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SKU: HBG8BPO-38X114
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Conquest 3/8" x 1-1/4" Grade 8 Indented Flange Bolt - Plain

Diameters

1/4" 5/16" 3/8" 7/16" 1/2" 5/8" 3/4"

Lengths

1/2" 5/8" 3/4" 1" 1-1/4" 1-1/2" 1-3/4" 2" 2-1/4" 2-1/2" 2-3/4" 3" 3-1/4" 3-1/2" 3-3/4" 4" 4-1/2" 5" 5-1/2" 6"
$067
Ships Nov 11 when you order now

Description

3/8" x 1-1/4" Conquest Grade 8 Indented Flange Bolt

When pairing a nut with a hex bolt, the material and finish must match. If these do not match, the nut will not fit the bolt.

The 3/8" Conquest Grade 8 Indented Flange Bolt is a high-performance fastener designed for serious structural and mechanical applications. Precision-engineered from tough Grade 8 alloy steel, it offers exceptional tensile strength and durability where reliability is non-negotiable.

Flange Bolts for Structural Connections

This bolt features an integrated indented flange head that acts as a built-in washer, distributing clamping force more evenly and reducing the need for additional hardware. The plain finish offers a cost-effective option for indoor or low-exposure environments, where corrosion resistance isn’t critical.

Key Features

  • Grade 8 Alloy Steel: Provides superior tensile and yield strength for high-load demands.
  • Indented Flange Head: Expands the load area, reducing surface damage and eliminating washer needs.
  • Plain Finish: Ideal for interior use or protected installations where coating isn’t necessary.
  • Coarse Thread (16 TPI): Enables quick, reliable fastening with excellent grip.
  • Precision Machined Threads: Ensures smooth thread engagement and consistent holding power.

Common Applications

  • Structural steel bolting in commercial and industrial construction
  • Assembly and maintenance of agricultural and heavy-duty machinery
  • Automotive frame, suspension, and chassis installations
  • Industrial machinery builds and repairs requiring high-strength fastening
  • OEM hardware replacement in equipment where tensile reliability is critical

Installation Tips

  • Always use with matching Grade 8 nuts to maintain load capacity and thread compatibility
  • Torque to spec per ASTM A354 or SAE J429 guidelines to prevent thread damage or bolt failure
  • Inspect threads before installation; clean and align properly to ensure smooth engagement
  • Do not overtighten, built-in flange provides proper load distribution without additional washers
  • Use in dry, protected environments to maximize bolt lifespan with plain finish

California Residents: WARNING

Specifications
Diameter: 3/8"
Length: 1-1/4"
Thread Length: Fully Threaded
Thread Type: Coarse
Threads Per Inch: 16
Head Type: Hex Head
Material: Alloy Steel
Finish: Plain
Type: Grade 8
Product Weight: 0.06 lbs.
Manufacturer Name: Conquest Fasteners
Quantity: 1 Bolt
Additional Info: • SAE J429
• X9- ASTM Equivalent: A354 Grade BD

Reviews
(12)

Customer Reviews

Based on 12 reviews
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(12)
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M
Mark Henderson
Flange bolts are great

I use flange bolts for almost every application. The additional clamping power and not digging into softer metals.

D
Dusty Chavis
Fast and easy

Well, this is the first time I really has ever ordered boats online and it was such an easy process through this company that I wouldn’t go. Any anywhere else to purchase anything but right here. Thank you for such a well organized and customer oriented company.

t
todd sykes

Great prices! My go to place for bolts etc.

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Our Iowa-based 23,000 square foot manufacturing facility was carefully crafted for the high quality, custom production of tie-down straps and chains, lifting slings, cargo nets, and more. Your vision brought to life.

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