Qi Sheng supplies a complete range of industrial nuts for OEM manufacturers, distributors, and project buyers. Our nut categories cover common assembly and maintenance needs—such as hex nuts, flange nuts, cap nuts, lock nuts, coupling nuts, square nuts, wing nuts, tee nuts, and weld nuts.
We support specification-based sourcing by thread standard (metric/imperial), size range, strength grade, material selection (e.g., carbon steel, stainless steel), and corrosion-resistant finishes. If you are matching an existing fastener set, we can help confirm nut type, thread, and application fit to ensure reliable assembly performance.
For fast quoting, please share: nut type, thread size, material/grade, finish, quantity, and any required standard.

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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.
DIN 6923 Hex Flange Nut
Hex flange nut for secure and stable fastening in machinery and equipment.

DIN 6923 Hex Flange Nut

  1. Complies with ISO 4161, DIN 6923, ANSI B18.2.2; integrated washer-type locking fasteners
  2. Material: Carbon steel (45#), stainless steel (304/316), brass; strength grades 4.8–12.9
  3. Structure: Hexagonal body + integral flange (with anti-slip serrations) + coarse/fine internal thread
  4. Surface treatments: Zinc plating, black oxide, hot-dip galvanizing, passivation
  5. Size M2–M36 (matches standard bolts)
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)
DIN 935 Hexagon Slotted and Castle Nut
DIN 935 Hexagon Slotted and Castle Nut

DIN 935 Hexagon Slotted and Castle Nut

  1. Complies with ISO 8673, DIN 935, ANSI B18.2.2; high-reliability anti-loosening fasteners
  2. Material: Carbon steel (45#), alloy steel (42CrMo), stainless steel (304/316); strength grades 4.8–12.9
  3. Structure: Hexagonal body + top axial slots (3–6 slots) + internal coarse/fine thread
  4. Surface treatments: Zinc plating, black oxide, passivation, hot-dip galvanizing
  5. Size M5–M36 (matches bolts with cotter pin holes)
DIN1587 Hexagon Domed Cap Nuts
Hexagon domed cap nuts with internal threading for secure fastening.

DIN1587 Hexagon Domed Cap Nuts, High Type

  1. Complies with ISO 4033, DIN 1587 (high type), ANSI B18.2.2; high-protection decorative fasteners
  2. Material: Carbon steel (45#), stainless steel (304/316), brass; strength grades 4.8–9
  3. Structure: Hexagonal body + high domed closed top (taller than low-type) + internal coarse/fine thread
  4. Surface treatments: Zinc plating, black oxide, passivation, chrome plating
  5. Size M2–M36 (matches standard bolts)
DIN315 Wing Nuts Butterfly Nut
DIN315 Wing Nuts Butterfly Nut

DIN315 Wing Nuts Butterfly Nut

  1. Complies with ISO 3161, DIN 315, ANSI B18.17; hand-operated quick-lock fasteners
  2. Material: Carbon steel, stainless steel (304), plastic, brass; strength grades 4.8–8.8
  3. Structure: Double wing-shaped head (for hand twisting) + internal coarse/fine thread
  4. Surface treatments: Zinc plating, black oxide, passivation
  5. Size M3–M16 (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)
DIN557 Square Nut
Three DIN557 square nuts for mechanical assembly and fastening.

DIN557 Square Nut

  1. Complies with ISO 8992, DIN 557, ANSI B18.2.2; universal anti-rotation locking fasteners
  2. Material: Carbon steel (45#), stainless steel (304/316), brass; strength grades 4.8–12.9
  3. Structure: Square profile + standard thickness + internal coarse/fine thread
  4. Surface treatments: Zinc plating, black oxide, passivation, hot-dip galvanizing
  5. Size M2–M36 (matches standard bolts)
DIN562 Square Thin Nut
Square thin nut for mechanical fastening applications.

DIN562 Square Thin Nut

  1. Complies with ISO 4036, DIN 562, ANSI B18.2.2; space-saving anti-rotation fasteners
  2. Material: Carbon steel (45#), stainless steel (304/316), brass; strength grades 4.8–10.9
  3. Structure: Square profile + thin thickness (1/2–2/3 of standard square nuts) + internal thread
  4. Surface treatments: Zinc plating, black oxide, passivation
  5. Size M2–M24 (matches standard bolts)
DIN6334 Long Hex Coupling Nut
DIN6334 Long Hex Coupling Nut

DIN6334 Long Hex Coupling Nut

  1. Complies with ISO 8673, DIN 6334, ANSI B18.2.2; bolt extension/docking fasteners
  2. Material: Carbon steel (45#), stainless steel (304/316), alloy steel (42CrMo); strength grades 4.8–12.9
  3. Structure: Long hexagonal body + full-through internal thread (coarse/fine) + end chamfers (for guiding)
  4. Surface treatments: Zinc plating, black oxide, passivation, hot-dip galvanizing
  5. Size M4–M36, length 10–100mm (longer than standard nuts)
DIN6926 Hexagon Flange Nylon Lock Nut
High-quality DIN6926 nylon lock nut with flange for secure fastening.

DIN6926 Hexagon Flange Nylon Lock Nut

  1. Complies with ISO 10511, DIN 6926, ANSI B18.16.6; integrated anti-loosening & pressure-dispersing fasteners
  2. Material: Carbon steel (45#), stainless steel (304/316), brass; strength grades 4.8–10.9
  3. Structure: Hexagonal body + integral flange (with anti-slip serrations) + internal nylon insert + coarse/fine thread
  4. Surface treatments: Zinc plating, black oxide, passivation
  5. Size M2–M36 (matches standard bolts)