10pcs UNC Grade 10.9 Black Hex Socket Mushroom Head Bolts

JARBLUE 10pcs UNC American Standard Grade 10.9 Black Hex Socket Round Head Screws

Upgrade your metalworking and assembly projects with these precision-engineered Grade 10.9 Carbon Steel Hex Socket Mushroom Head Bolts. Available in UNC American Standard sizes — 0#-80, 2#-56, 4#-40, 6#, 8#, and 10# — these black-finish bolts combine high tensile strength with a sleek, low-profile round (mushroom) head design. Perfect for machinery, electronics enclosures, automotive components, and DIY fabrication work.

Key Features

• Grade 10.9 Carbon Steel — High-strength construction for demanding applications
• UNC American Standard Thread — Compatible with standard US-spec components and assemblies
• Hex Socket (Allen) Drive — Enables high torque with a clean, recessed finish
• Round / Mushroom Head Profile — Low-profile head distributes clamping force evenly across surfaces
• Black Oxide Finish — Adds corrosion resistance and a professional matte appearance
• CE Certified — Meets relevant European conformity standards
• Pack of 10 — Convenient quantity for projects, repairs, and prototyping

Specifications

What Can You Use These For?

These versatile hex socket bolts are ideal for a wide range of applications including machine assembly, electronics housings, robotics, fixtures, model engineering, and precision metalworking. The mushroom head provides a larger bearing surface than a standard cap head, making it excellent where load distribution across thin or soft materials matters.

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Frequently Asked Questions

Q: What sizes are included in the JARBLUE UNC hex socket mushroom head bolt set?

A: These bolts are available in UNC American Standard sizes: 0#-80, 2#-56, 4#-40, 6#, 8#, and 10#. Each pack contains 10 pieces in the selected size, making them great for targeted repairs or project builds.

Q: What grade of steel are these hex socket bolts made from?

A: These bolts are manufactured from Grade 10.9 Carbon Steel, which is a high-tensile alloy offering excellent strength and durability under load — suitable for mechanical and structural fastening applications.

Q: What size Allen (hex) key do I need to drive these screws?

A: The required Allen key size depends on the bolt size you select. As a general guide, smaller sizes like 0# and 2# typically use a 0.05" (1.27mm) or 1/16" hex key, while larger sizes such as 8# and 10# use a 3/32" or 7/64" hex key. Always verify with a test fit before applying full torque.

Q: Are these bolts compatible with standard American UNC-threaded components?

A: Yes. These screws follow the Unified National Coarse (UNC) American Standard thread specification, ensuring compatibility with standard US-spec nuts, inserts, and threaded holes of the corresponding size.

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.