Custom Blue Zinc-Plated Carbon Steel Hex Head Bolt with Internal Hex Drive – Precision Threaded Fastener for Mechanical Assembly

This high-strength carbon steel bolt is engineered for precision fastening applications across mechanical and industrial equipment. The bolt features a combination of traditional hex head and internal hex (Allen) drive at the tail end, offering versatile installation options and robust torque handling.

Key Product Features:

• Material & Surface Finish
  Manufactured from high-quality carbon steel, the bolt is electroplated with a blue zinc coating, providing excellent corrosion resistance, improved appearance, and extended service life—suitable for indoor and semi-outdoor environments.

• Hexagonal Head Design
  The bolt head is shaped with clean, symmetrical six flat sides for secure grip with wrenches or sockets. This allows for easy tightening in high-torque applications and facilitates tool access in tight spaces.

• Precision Threaded Shank
  The bolt shaft features uniform, tightly spaced threads with clear thread definition, ensuring smooth and secure mating with nuts or threaded holes. The threading conforms to industry standards (metric or imperial, customizable).

• Internal Hex Socket (Tail End)
  At the tail of the bolt is an internal hexagonal recess, allowing the bolt to be driven or removed using a hex key (Allen wrench). This feature is especially valuable in confined spaces or recessed installations where traditional tools cannot reach.

Applications Include:

• Machinery assembly and maintenance

• Automotive and engine parts

• Equipment frame or housing fastening

• Electronic enclosures and control panels

• Industrial-grade mechanical connections

Whether used as a primary structural fastener or for precision assembly, this hybrid-head bolt delivers dependable performance, installation flexibility, and durability in demanding environments.

Our Manufacturing Capabilities

We are a professional manufacturer of custom bolts, screws, and specialty fasteners. Leveraging CNC machining, cold forging, and precision threading technology, we can produce high-quality components tailored to your specifications.

Core Capabilities:

• Material Options:
  Carbon steel, alloy steel, stainless steel (304/316), brass, aluminum, titanium, etc.

• Thread Types Supported:
  Metric (M), Unified (UNC/UNF), BSW, custom threads (ACME, Trapezoidal, etc.)

• Head Styles Available:
  Hex head, socket cap, button head, flat head, pan head, round head, and more

• Drive Types:
  Slotted, Phillips, Torx, Allen (hex), custom tamper-proof designs

• Surface Treatments:
  Blue zinc plating, black oxide, nickel plating, Dacromet, hot-dip galvanizing, etc.

• Precision Tolerances:
  +/- 0.01mm on critical dimensions; threading per ISO/DIN/ANSI/JIS standards

• Batch Sizes:
  From small prototype runs to high-volume OEM production

• Quality Control:

  • 100% dimensional inspection

  • Salt spray corrosion testing

  • Hardness and material certification

  • Thread pitch and concentricity checks

Need custom bolts or specialty fasteners engineered for your project?
Send us your drawings, samples, or technical requirements—we offer full OEM/ODM support with fast response times and competitive pricing.