Home » DIN 934 Hex Nut - Hot Dip Galvanized (ISO-FIT) Grade 8

DIN 934 Hex Nut - Hot Dip Galvanized (ISO-FIT) Grade 8

DIN 934 Hex Nut - Medium Carbon Steel, Hot Dip Galvanized ISO-FIT, Class 8

FULLERKREG DIN 934 Class 8 Hexagon Nuts in medium carbon steel with hot dip galvanized (HDG) ISO-FIT surface treatment deliver maximum corrosion protection for outdoor, structural, and heavy industrial applications. Manufactured to DIN 934 / ISO 4032 at strength Class 8 and galvanized to ISO 10684, these nuts feature an over-tapped thread (ISO-FIT) to accommodate the thick zinc coating while maintaining a standard 6AZ thread fit with galvanized bolts. The hot dip galvanizing process provides a metallurgically bonded zinc-iron alloy layer with outstanding long-term corrosion resistance.

  • Material: Medium Carbon Steel (quenched and tempered)
  • Surface Treatment: Hot Dip Galvanized (HDG), ISO-FIT over-tapped thread
  • Strength Class: Class 8 (ISO 898-2)
  • Standard: DIN 934 / ISO 4032; Galvanizing per ISO 10684
  • Thread: Metric Coarse, over-tapped 6AZ per ISO 965-4 (ISO-FIT)
  • Size Range: M6 to M64
  • Drive Type: Hexagon (6-sided)
  • Mating Bolt Class: 8.8 (galvanized)
  • Corrosion Life: 50+ years in moderate environments; 25+ years in industrial/marine

Dimensional Data - DIN 934 Hex Nut Hot Dip Galvanized ISO-FIT Class 8

All dimensions in mm. Tolerances per DIN 934 / ISO 4032. Thread over-tapped to 6AZ per ISO 965-4 to accommodate HDG coating. Unit weight based on medium carbon steel density 7.85 g/cm3, excluding coating.

Thread Pitch (mm) s (mm) e (mm) m (mm) Weight (g/pc)
M6 1.00 10.00 11.55 5.00 3.06
M8 1.25 13.00 15.01 6.50 6.72
M10 1.50 17.00 19.64 8.00 13.30
M12 1.75 19.00 21.94 10.00 21.70
M14 2.00 22.00 25.40 11.00 34.60
M16 2.00 24.00 27.71 13.00 51.40
M18 2.50 27.00 31.18 15.00 79.10
M20 2.50 30.00 34.64 16.00 106.80
M22 2.50 32.00 36.95 18.00 146.20
M24 3.00 36.00 41.57 19.00 193.80
M27 3.00 41.00 47.34 22.00 291.50
M30 3.50 46.00 53.12 24.00 414.80
M33 3.50 50.00 57.74 26.00 553.60
M36 4.00 55.00 63.51 29.00 751.20
M39 4.00 60.00 69.28 31.00 968.40
M42 4.50 65.00 75.06 34.00 1264.00
M48 5.00 75.00 86.60 38.00 1994.00
M52 5.00 80.00 92.38 42.00 2645.00
M56 5.50 85.00 98.15 45.00 3308.00
M64 6.00 95.00 109.70 51.00 4942.00

s = Width Across Flats | e = Width Across Corners | m = Nut Height. Thread over-tapped to 6AZ tolerance for HDG coating.

Hot Dip Galvanizing - ISO-FIT Explained

Hot dip galvanizing (HDG) immerses the nuts in molten zinc at approximately 450 degrees C, creating a metallurgically bonded zinc-iron alloy coating. The ISO-FIT designation means the internal thread is over-tapped to a wider 6AZ tolerance (per ISO 965-4) before galvanizing, ensuring the thick zinc coating does not interfere with thread assembly.

  • Coating Thickness: 45-85 microns (per ISO 10684); far thicker than electroplated coatings
  • Metallurgical Bond: Zinc-iron alloy layers fused to base steel - cannot peel or flake
  • Cathodic Protection: Sacrificial zinc layer protects base steel even at cut edges and scratches
  • ISO-FIT Thread: Over-tapped 6AZ tolerance per ISO 965-4; mates with standard galvanized bolts
  • Corrosion Life: 50+ years in rural/suburban; 25+ years in industrial/marine environments
  • No Hydrogen Embrittlement: Hot dip process - no risk of hydrogen embrittlement vs. electroplating

HDG vs. Other Surface Treatments - Comparison

Property Hot Dip Galvanized Zinc Plated Cr3 Black Oxide
Coating Thickness 45-85 microns 5-12 microns Less than 1 micron
Salt Spray 500+ hours 72-120 hours 2-48 hours
Corrosion Life 25-50+ years 3-10 years Months (oiled)
Bond Type Metallurgical (alloy) Electrolytic Chemical conversion
Thread Fit Over-tapped 6AZ (ISO-FIT) Standard 6H Standard 6H
Best For Outdoor / structural / marine General outdoor Tooling / aesthetics

Selection Guide - DIN 934 vs. Related Standards

Standard Profile Height Typical Use
DIN 934 / ISO 4032 Standard hex Normal ~0.8d General fastening - most common
DIN 439 / ISO 4035 Thin hex Low ~0.5d Jam nut / lock nut
DIN 985 / ISO 10511 Nylon insert lock nut Higher Vibration / reusable locking
DIN 936 Thin nut Very low ~0.4d Fine-pitch adjustment

Strength Class Comparison

Property Class 4 Class 6 Class 8 Class 10
Proof Load Stress 510 MPa 600 MPa 800 MPa 1040 MPa
Material Low carbon Med. carbon Med. carbon Q&T Alloy steel
Mating Bolt 4.6 / 4.8 5.8 / 6.8 8.8 10.9
Hardness 110-200 HV 150-302 HV 200-302 HV 272-353 HV

Standard Specification

  • Thread tolerance: 6AZ per ISO 965-4 (over-tapped for HDG coating)
  • Mechanical properties: Class 8 per ISO 898-2 (proof load stress 800 MPa)
  • Hardness: 200-302 HV
  • Dimensional tolerance: Grade A for M6-M16; Grade B for M18-M64
  • Galvanizing standard: ISO 10684; coating thickness 45-85 microns
  • Mating thread: Use with galvanized bolts tapped to 6AZ tolerance

Mechanical Properties - Class 8

Property Value Standard
Proof Load Stress 800 MPa ISO 898-2
Hardness 200-302 HV ISO 898-2
Mating Bolt Class 8.8 (galvanized) ISO 898-2
Material Condition Quenched and Tempered -
Galvanizing Temp. approx. 450 deg C molten zinc ISO 10684
Coating Thickness 45-85 microns ISO 10684

Chemical Composition - Medium Carbon Steel

Element C Mn P S Si
Medium Carbon Steel 0.25-0.55% 0.50-1.65% max 0.045% max 0.045% max 0.40%

Typical Applications

  • Structural Steel Construction - Outdoor bolted connections, steel frames, and building structures requiring long-term corrosion protection
  • Bridges and Civil Engineering - High-load structural joints in exposed outdoor environments
  • Transmission Towers and Utility Poles - Power line and telecommunications infrastructure
  • Marine and Coastal Infrastructure - Pier structures, offshore platforms, and coastal construction
  • Agricultural Equipment - Farm machinery and irrigation systems exposed to soil and moisture
  • Mining and Heavy Equipment - Outdoor and underground equipment in corrosive environments

Product Gallery - DIN 934 Hex Nut Hot Dip Galvanized ISO-FIT Class 8

       

Why Choose FULLERKREG?

  • Direct Manufacturer - No middlemen; factory-direct pricing on all standard and custom sizes
  • Strict Dimensional Control - 100% thread gauge inspection; CMM verification on critical dimensions
  • Material Traceability - Full mill certificates and galvanizing reports available per batch
  • Flexible MOQ and Packaging - Bulk bags, small boxes, or custom packaging; MOQ from 100 pcs
  • Global Shipping - Export experience to 50+ countries; DDP/FOB/CIF terms available
  • Fast Lead Times - Standard sizes in stock; custom sizes within 15-25 business days
  • Full Documentation - CoC, MTC, ISO 10684 galvanizing certificates on request
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