Name: High Tensile Hex Bolts, Six Sided Head, Secure Fastening
Brand: Caliber Enterprise
Availability: InStock
Rating: 4 (19 reviews)

Question 1

What is a high tensile bolt?

Accepted Answer

A high tensile bolt is a fastener made from alloy steel or medium carbon steel that has been heat treated to increase its strength. These bolts are built to withstand high stress and heavy loads without bending or failing. They are widely used in construction, industrial machinery, automotive systems and structural frameworks where dependable strength is required.

Question 2

What is the HT bolt specification?

Accepted Answer

HT (High Tensile) bolts are manufactured according to standards such as ISO 898-1, DIN 933, ASTM A325 and IS 1367. Common strength grades include 8.8, 10.9 and 12.9, where the first number indicates tensile strength in MPa (e.g., 800 MPa for Grade 8.8) and the second represents yield strength ratio. These bolts often feature coarse or fine threads and are made with black oxide, zinc or hot dip galvanized coatings for added protection.

Question 3

What bolt has the highest tensile strength?

Accepted Answer

Grade 12.9 bolts have the highest tensile strength among standard metric fasteners. They provide a minimum tensile strength of around 1,220 MPa and are typically made from alloy steel. These bolts are used in extremely demanding environments such as high performance automotive systems, industrial machinery and heavy structural assemblies where maximum strength and fatigue resistance are critical.