Electro-Galvanized Hex Bolt 1/2''-13×3.5'' Grade 2 AP-247

Product Overview: 1/2''-13×3.5'' Hex Bolt - Grade 2, Electro-galvanized AP-247

The AP-247 hex bolt delivers a highly reliable and economical fastening solution meticulously tailored for non-critical assemblies and general manufacturing applications. Forged from premium low-carbon steel, this fastener features a precision-applied electro-galvanized finish that presents a bright, clean, silver-like aesthetic while offering essential barrier protection against ambient moisture in dry, indoor environments. When handled, the bolt feels solid and precisely machined, with a smooth, burr-free shank that transitions flawlessly into uniform coarse threads, leaving absolutely no oily manufacturing residue on the assembly line. Designed to facilitate rapid, frictionless installation, it ensures consistent torque application and secure mating without unexpected binding or galling. Whether utilized in appliance construction, automotive interior framing, or light-duty machinery mounting, this component provides dependable holding power, strict dimensional consistency, and excellent long-term value for extensive production runs.

1/2"-13 (Thread Specification)

• 1/2" Diameter: The nominal major diameter of the bolt is precisely 0.5 inches (approx. 12.7 mm). Manufactured to comply strictly with ASME B18.2.1 dimensional tolerances, this ensures uniform load distribution and a precise, predictable fit within standardized clearance holes across various machinery components.

• 13 TPI (UNC): There are exactly 13 threads per inch (TPI), resulting in a thread pitch of approximately 1.95 mm. This specific geometry is rigorously verified using standard go/no-go gauges during quality control to guarantee dimensional accuracy and prevent costly assembly line delays.

• Thread Series & Compatibility: This is a UNC (Unified National Coarse) thread profile, the industry standard known for its exceptional resistance to cross-threading and galling. It facilitates faster assembly times and is engineered to mate flawlessly with standard 1/2"-13 hex nuts, flat washers, and spring lock washers, offering a comprehensive and secure fastening solution.

 3.5" (Length)

• The overall length of the threaded fastener is exactly 3-1/2 inches. This specific dimension provides ample reach for joining medium-to-thick materials, making it highly versatile for securing thick metal flanges, motor mounts, or multi-layered structural brackets in appliance and equipment manufacturing.

• Measurement Standard: For hex head bolts, this critical length is measured directly from under the head to the flat tip of the threaded body. This extended length guarantees sufficient protrusion to accommodate standard nut and double-washer configurations, ensuring full thread engagement which is vital for maintaining joint integrity under operational vibrations.

• Structural Alignment: The smooth, unthreaded shank portion transitions seamlessly into the threaded section. When installed in properly aligned clearance holes, this design helps distribute shear forces evenly across the grip length, significantly enhancing the overall stability and alignment of the assembled unit.

Grade 2 (Material & Strength)

• Grade 2 Classification: This fastener falls under the SAE J429 specification for low-carbon steel components. The material offers excellent ductility and reliable tensile performance, ensuring predictable behavior during torque application without the risk of sudden brittle failure.

• Characteristics & Applications: It serves as a fundamental, economical grade characterized by moderate strength. It is perfectly suited for general, non-critical applications—such as assembling general machinery, household appliances, and automotive interior accessories—where extreme stress, heavy vibrations, or excessive loads are not anticipated.

• Critical Safety Note: This is unequivocally not a high-strength structural bolt. It must never be utilized in critical load-bearing connections, heavy construction, or high-stress environments that strictly require the elevated mechanical properties of Grade 5, Grade 8, or ASTM A325/A490 heavy hex structural fasteners.

Electro-galvanized (Surface Finish)

• Plating Process: The hardware undergoes a highly controlled electro-galvanizing (zinc plating) treatment. This process utilizes an electrical current to deposit a uniform, thin layer of zinc across the complex geometry of the threads and head, ensuring complete coverage without altering the critical dimensional tolerances.

• Visual & Tactile Protection: The treatment yields a bright, silver-like finish that feels clean and smooth to the touch. It provides dependable corrosion resistance, acting as a sacrificial barrier against mild oxidation in dry, indoor environments, while fully complying with RoHS environmental directives and industrial electroplating standards.

• Environmental Limitations: While verified through standardized salt spray testing for indoor reliability, it is not suitable for harsh outdoor, marine, or high-humidity environments. Applications exposed to severe elements require more robust surface treatments, such as Hot-Dip Galvanizing or Zinc Flake coatings (like Delta-Tone), to prevent rapid degradation.

Procurement, Packaging & Supply Capabilities

When sourcing hardware for continuous production lines, logistical reliability is just as crucial as the physical specifications of the fastener. The AP-247 hex bolt series is supported by a robust manufacturing and supply chain infrastructure, specifically optimized to meet the rigorous demands of high-volume industrial procurement.

Standardized Packaging Logistics: To preserve the integrity of the precision threads and protect the bright electro-galvanized finish during global transit, all bolts are meticulously packed in heavy-duty, moisture-resistant corrugated cartons. These cartons are subsequently palletized, reinforced, and stretch-wrapped to create a stable, standardized logistical unit. This methodical packaging approach simplifies warehouse inventory management, prevents transit damage, and facilitates rapid unloading at your receiving docks. Furthermore, we support customized exterior labeling—including barcodes and internal part numbers—to integrate flawlessly with your automated inventory systems.

Production Capacity & OEM Customization: Leveraging advanced cold-heading technology and extensive raw material reserves, we maintain substantial inventory levels of standard 1/2"-13 sizes to guarantee predictable, stable lead times. For specialized manufacturing requirements, we offer comprehensive OEM customization services. This includes bespoke head mark stamping for proprietary brand identification or specific torque indicators. Our scalable production capacity ensures that whether you require a standard replenishment or a highly customized batch, your assembly lines will remain fully operational without component-related interruptions.