FULLY THREADED STUD BOLT GRADE 8.8 METRIC H.D.G (HOT DIP GAVANIZED)

Fully threaded rods, DIN 975/6, high tensile (Grade 8.8), Grade 8.8

DIN 976 Full Thread Stud

Full thread studs are threaded the entire length, similar to a piece of threaded rod or “all-thread”. Right hand threaded, both ends can accept a nut or installation into a tapped hole.

Material

Class 8.8 metric studs provide a medium strength, high tensile fastening solution. Pair with Class 8 or stronger nuts.

1. What is a Grade 8.8 Fully Threaded Stud Bolt?

A Grade 8.8 fully threaded stud bolt is a high-strength carbon steel fastener with full-length external threads. It is commonly used in construction, machinery, automotive, and structural applications due to its high tensile strength and good toughness.

2.Standards & Specifications:

  • ISO 898-1 (Mechanical properties of fasteners)

  • DIN 976 (Metric fully threaded stud bolts)

  • ASTM A324 (High-strength steel bolts)

  • BS 3692 (British Standard for bolts and nuts)

3. Available Sizes & Coatings:

Thread Sizes:

  • Metric: M6 to M100

  • Imperial: ¼” to 4”

Coatings:

  • Plain (Uncoated) – Standard use, may require lubrication

  • Zinc Plated (Electro-Galvanized) – Moderate corrosion resistance

  • Hot-Dip Galvanized (HDG) – Strong corrosion resistance for outdoor use

  • Black Oxide – Improves lubrication and minor corrosion resistance

  • PTFE Coating – Chemical and weather resistance

6. Applications of Grade 8.8 Stud Bolts:

Structural & Construction Projects – Bridges, buildings, steel structures
Automotive & Heavy Equipment – Engine assembly, suspension systems
Machinery & Manufacturing – High-strength connections
Oil & Gas Industry – Equipment subjected to high loads
Power Plants & Energy Sector – Turbines, pressure vessels

7. Grade 8.8 vs. Other Bolt Grades comparison.

Property Grade 8.8 Grade 10.9 Grade 12.9 Grade 4.6 (Mild Steel)
Tensile Strength (MPa) 800 – 1000 1040 – 1240 1220 – 1400 400 – 500
Yield Strength (MPa) ≥ 640 ≥ 940 ≥ 1080 240
Hardness (HRC) 22 – 32 32 – 39 39 – 44 12 – 20
Corrosion Resistance Moderate Moderate Low Low

  • Grade 8.8: Medium-high strength, widely used.

  • Grade 10.9 & 12.9: Higher strength for critical applications.

  • Grade 4.6: Low strength, used in non-load-bearing applications.

8. Grade 8.8 Stud Bolt Marking.

  • Marking: “8.8” is usually stamped on the bolt head or nut.

  • Black oxide or zinc-plated finish (unless otherwise specified).