What sizes are stocked?

US/Inch hex bolts are available from 1/4" up to 2-1/2" diameter across Hex and Hex Flange styles. Many lengths and thread pitches are stocked for fast fulfillment.

Which grades and materials are available?

L9 (Made in USA), Grade 8, Grade A, Grade B, A307, plus 18-8 and 316 stainless. Finishes include HDG (hot-dip galvanized) and Zinc Yellow, with RoHS-compliant options.

Are MTRs and compliance documents available?

Yes. Material Test Reports are available on request for bulk cartons. CR+3 zinc, HDG, and plain finishes sold by Monster Bolts are RoHS compliant.

Do I need special nuts for HDG bolts?

Yes. Hot-dip galvanized bolts typically require properly sized HDG nuts to accommodate zinc coating thickness.

Bulk US / Inch Hex Bolts & Hex Flange Bolts – Grade 8, L9, A307, Stainless | MonsterBULKS

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MonsterBULKS Volume pricing • Carton integrity • Fast U.S. shipping • MTR on request

Bulk US / Inch Hex Bolts

Looking for large-volume, cost-effective US / Inch Hex Bolts for manufacturing or construction? This bulk collection includes Hex Bolts and Hex Flange Bolts, plus a robust L9 (Made in USA) high-strength line. Choose from Grade 8, Grade A, Grade B, A307, 18-8 and 316 stainless, with HDG (hot-dip galvanized) and Zinc Yellow finishes. Sizes run from 1/4" up to 2-1/2" diameter to cover everyday jobs through heavy industrial applications.

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Material Family

Quick Sizes

At Monster Bolts, we pair competitive bulk pricing with expert support. Need fewer than bulk quantities? Browse standard US Hex Bolt listings.

Notes: L9 is a high-strength, Made-in-USA line ideal for critical joints. HDG provides robust corrosion resistance (use correctly sized HDG nuts). Zinc Yellow offers enhanced appearance and moderate corrosion protection. Stainless options include 18-8 (general purpose) and 316 (marine/chemical). All CR+3 zinc, HDG, and plain finishes are RoHS compliant. MTRs available on request.

Shipping Note: Bulk shipping times can vary slightly based on inventory location and order size. Most orders ship quickly, but smaller bulk quantities may take a few extra days to process.