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

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

1/2"-13 (Thread Specification)

• 1/2": The nominal major diameter of the bolt is 0.5 inches (approx. 12.7 mm).

• 13: There are 13 threads per inch (TPI), resulting in a pitch of approximately 1.95 mm.

• Thread Series: This is a UNC (Unified National Coarse) thread, the standard coarse thread series known for resistance to cross-threading and faster assembly.

 3.5" (Length)

• The overall length of the bolt is 3-1/2 inches.

• Measurement: For hex bolts, this length is measured from under the head to the tip.

Grade 2 (Material & Strength)

• Grade 2: This is an SAE J429 classification for low-carbon steel.

• Characteristics: It is a basic, economical grade with moderate strength. It is suitable for general, non-critical applications (e.g., general machinery, appliances, automotive accessories) where high stress or extreme loads are not expected.

• Note: It is not a high-strength structural bolt. Do not use in critical structural connections requiring Grade 5, Grade 8, or ASTM A325/A490.

Electro-galvanized (Surface Finish)

• Process: Electro-galvanizing (Zinc Plating) applies a thin zinc layer via electrical current.

• Protection: Provides a bright, silver-like finish with good corrosion resistance for dry, indoor environments.

• Limitation: It is not suitable for harsh outdoor, marine, or high-humidity environments. For those, Hot-Dip Galvanizing or Zinc Flake coatings (like Delta-Tone) are required.