Qi Sheng hex nuts are the most commonly used nuts for general fastening with bolts and threaded rods. The six-sided shape allows easy installation with standard wrenches and sockets, making hex nuts widely applied in construction, machinery, and maintenance work.
We offer hex nuts in various thread standards and sizes, with options for different strength grades, materials, and surface finishes to suit indoor or outdoor environments. Bulk supply and OEM packaging are available for B2B buyers.
Send your required thread size, grade/material, finish, and quantity for a quotation.

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Heavy hex nuts used in industrial fastening applications.

ASTM A194 2H Heavy Hex Nuts

Engineered for extreme pressure and high-temperature service, the ASTM A194 2H Heavy Hex Nut by Qi Sheng delivers maximum joint integrity for critical B2B industrial applications. Manufactured from quenched and tempered carbon steel, it is the standard fastening solution for flanges, valves, and pressure vessels.

  1. High-Temperature Performance: Designed to maintain strength and structural stability in high-heat environments.
  2. Heavy-Duty Strength: Quenched and tempered medium carbon steel ensures exceptional proof load capabilities.
  3. Perfect Compatibility: The ideal mating nut for high-strength ASTM A193 Grade B7 stud bolts and hex bolts.
  4. Wider Across-Flats: Heavy hex design provides a larger bearing surface area to distribute clamp load safely.
  5. Primary Industries: Oil & Gas, Petrochemical Refineries, Power Generation, and Heavy Structural Engineering.
Heavy hex nuts used in industrial fastening applications.

ASTM A563 Heavy Hex Nuts

Engineered for robust structural connections, the ASTM A563 Heavy Hex Nut by Qi Sheng provides exceptional load distribution and fastening security for heavy-duty B2B applications. Manufactured from premium carbon and alloy steel, it is the standard choice for civil engineering, commercial buildings, and infrastructure projects.

  1. Structural Integrity: The designated mating nut for high-strength structural bolts (such as ASTM A325 and A490).
  2. Heavy Hex Profile: Wider across-flats dimension provides a larger bearing surface to safely distribute high clamping loads.
  3. Versatile Grades: Available in multiple grades (Grade A, C, DH) to meet varying tensile strength requirements.
  4. Weather Resistance: Optional Hot-Dip Galvanized (HDG) coating ensures long-lasting protection in harsh outdoor environments.
  5. Primary Industries: Construction, Bridge Building, Solar PV Infrastructure, and Heavy Manufacturing.
Hex Nut for Mechanical Fastening.
Hex Nut for DIN 934 standard, high-quality steel, corrosion-resistant finish.

DIN 934 Hex Nut

  1. Complies with ISO 4032, DIN 934, ANSI B18.2.2; universal standard locking fasteners
  2. Material: Carbon steel (45#), stainless steel (304/316), brass; strength grades 4.8–12.9
  3. Structure: Hexagonal profile + standard thickness + coarse/fine internal thread
  4. Surface treatments: Zinc plating, black oxide, passivation, hot-dip galvanizing
  5. Size M2–M36 (matches standard bolts)
DIN439 Hexagon Thin Nut
DIN439 Hexagon Thin Nut

DIN439 Hexagon Thin Nut

Hexagon Thin Nut

  1. Complies with ISO 4035, DIN 439, ANSI B18.2.2; space-saving locking fasteners
  2. Material: Carbon steel (45#), stainless steel (304/316), brass; strength grades 4.8–10.9
  3. Structure: Hexagonal profile + thin thickness (1/2–2/3 of standard nuts) + internal thread
  4. Surface treatments: Zinc plating, black oxide, passivation;\
  5. Size M2–M24 (matches standard bolts)
Heavy Hex Nut
Heavy Hex Nut

Heavy Hex Nut

  1. Complies with ISO 4032, DIN 934 (heavy type), ANSI B18.2.2; heavy-duty locking fasteners
  2. Material: Carbon steel (45#), alloy steel (42CrMo), stainless steel (304/316); strength grades 8.8–12.9
  3. Structure: Hexagonal profile (wider across flats) + increased thickness + coarse/fine internal thread
  4. Surface treatments: Zinc plating, black oxide, hot-dip galvanizing, passivation
  5. Size M6–M36 (matches heavy hex bolts)
High-quality stainless steel hex socket screw thread insert nuts for secure fastening.
Hex socket screw thread insert nut for secure fastening.

Hex Socket Screw Thread Insert Nut

  1. Complies with ISO 8787, DIN 8140, ANSI B18.29.2; thread reinforcement insert fasteners
  2. Material: Carbon steel, stainless steel (304/316), brass
  3. Surface treatments: Zinc plating, passivation, nickel plating
  4. Structure: Hex socket (for installation torque) + external thread/knurled body + internal precision thread
  5. Size: Internal thread M3–M20, external thread matching, length 6–30mm (for soft materials like aluminum, plastic, wood)