304 SS Serrated Flange Hex Bolts UNC 1/4-20 5/16-18 3/8-16 10pcs
304 SS Serrated Flange Hex Bolts UNC 1/4-20 5/16-18 3/8-16 10pcs
Details
JARBLUE 304 Stainless Steel Serrated Flange Hex Bolts — UNC 1/4-20, 5/16-18 & 3/8-16
Upgrade your fastening projects with these heavy-duty 304 stainless steel serrated flange hex cap screws. The integrated serrated flange washer head distributes clamping load evenly and bites into the mating surface to resist loosening — no separate lock washer needed. Whether you're assembling machinery, automotive components, or structural fixtures, these UNC machine screws deliver reliable, corrosion-resistant holding power.
Key Features
- Material: Grade 304 stainless steel — excellent corrosion and rust resistance for indoor and outdoor use
- Thread Standard: UNC (Unified National Coarse) — 1/4-20, 5/16-18, and 3/8-16
- Length Range: 3/8" to 2 inches — versatile sizing for a wide range of applications
- Head Style: External hex (hexagon head) with integrated serrated flange washer — provides superior vibration resistance without extra hardware
- Surface Finish: Natural / untreated stainless finish
- Standard: GB5787
- Package: 10 pieces per pack
- Drive: External hex drive — use a standard hex/socket wrench or spanner for fast, secure installation
Specifications at a Glance
| Spec | Detail |
|---|---|
| Material | 304 Stainless Steel |
| Thread Sizes | 1/4-20 | 5/16-18 | 3/8-16 (UNC) |
| Length | 3/8" – 2" |
| Head Style | Hex with Serrated Flange |
| Surface | Untreated / Natural |
| Standard | GB5787 |
| Quantity | 10 Pieces |
| Brand | JARBLUE |
| Country of Origin | Made in China |
Common Applications
- Automotive and engine assemblies
- Machinery and equipment fabrication
- Structural steel and metalwork
- Marine and outdoor installations
- DIY and workshop projects
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Learn more: OSHA guidance on hand and power tools
Frequently Asked Questions
Q: What is the advantage of a serrated flange hex bolt over a standard hex bolt?
A: The serrated (toothed) flange on these hex bolts acts like a built-in lock washer. The serrations grip the mating surface when tightened, preventing loosening from vibration or dynamic loads — eliminating the need for a separate flat or split washer in most applications.
Q: Are these bolts suitable for outdoor or marine use?
A: Yes. Made from 304 stainless steel, these UNC flange hex bolts offer strong resistance to corrosion, oxidation, and moisture, making them well-suited for outdoor, marine, and high-humidity environments.
Q: What tools do I need to install these bolts?
A: These bolts feature a standard external hexagon head, so they can be driven with a hex socket wrench, open-end spanner, or combination wrench in the appropriate size for 1/4-20, 5/16-18, or 3/8-16 thread sizes.
Q: What length options are available for each thread size?
A: Length options range from 3/8 inch to 2 inches across the available UNC thread sizes (1/4-20, 5/16-18, and 3/8-16). Please select your required thread size and length combination when ordering.
Production & Packaging Notice
To maintain high stock availability and fast shipping times, our items are sourced from multiple verified manufacturing facilities. While the core quality, materials, and product specifications remain identical, you may notice slight variations in the packaging design, manufacturing origin, or the wording of the printed instructions.
Materials + Care
We prioritize quality in selecting the materials for our items, choosing premium fabrics and finishings that ensure durability, comfort, and timeless appeal.
Shipping + Returns
We strive to process and ship all orders in a timely manner, working diligently to ensure that your items are on their way to you as soon as possible.