Home » DIN 934 Hex Nut - Black Grade 8

DIN 934 Hex Nut - Black Grade 8

DIN 934 Hex Nut - Medium Carbon Steel, Black Oxide, Class 8

FULLERKREG DIN 934 Class 8 Hexagon Nuts in medium carbon steel with black oxide surface treatment combine high-strength mechanical performance with a distinctive matte black appearance. Manufactured to DIN 934 / ISO 4032 at strength Class 8, these nuts are the preferred choice for structural, automotive, and industrial applications where both high clamping force and a professional black finish are required.

  • Material: Medium Carbon Steel (quenched and tempered)
  • Surface Treatment: Black Oxide (hot alkaline blackening)
  • Strength Class: Class 8 (ISO 898-2)
  • Standard: DIN 934 / ISO 4032
  • Thread: Metric Coarse (ISO 68-1)
  • Size Range: M1.6 to M64
  • Drive Type: Hexagon (6-sided)
  • Mating Bolt Class: 8.8
  • Appearance: Uniform matte black finish; no dimensional change from coating

Dimensional Data - DIN 934 Hex Nut Black Class 8

All dimensions in mm. Tolerances per DIN 934 / ISO 4032. Unit weight based on medium carbon steel density 7.85 g/cm3.

Thread Pitch (mm) s (mm) e (mm) m (mm) Weight (g/pc)
M1.6 0.35 3.20 3.70 1.30 0.07
M2 0.40 4.00 4.62 1.60 0.13
M2.5 0.45 5.00 5.77 2.00 0.26
M3 0.50 5.50 6.35 2.40 0.36
M3.5 0.60 6.00 6.93 2.80 0.54
M4 0.70 7.00 8.08 3.20 0.83
M5 0.80 8.00 9.24 4.00 1.58
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
M45 4.50 70.00 80.83 36.00 1601.00
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
M60 5.50 90.00 103.92 48.00 4050.00
M64 6.00 95.00 109.70 51.00 4942.00

s = Width Across Flats | e = Width Across Corners | m = Nut Height

Black Oxide Surface Treatment

FULLERKREG applies hot alkaline black oxide treatment to all Class 8 DIN 934 hex nuts, creating a uniform magnetite (Fe3O4) layer on the steel surface.

  • Coating Thickness: Less than 1 micron - zero dimensional change; thread tolerance fully maintained
  • Appearance: Uniform matte black finish; no flaking or peeling
  • Anti-Glare: Eliminates light reflection - ideal for optical and precision instrument assemblies
  • Corrosion Resistance: Mild protection; enhanced with post-treatment oil or wax coating
  • No Hydrogen Embrittlement Risk: Chemical conversion process - no electrolytic plating involved
  • RoHS Compliant: No heavy metals; environmentally safe process

Black Oxide vs. Zinc Plating

Property Black Oxide Zinc Plated Cr3
Appearance Matte black Bright silver-blue
Coating Thickness Less than 1 micron 5-12 microns
Salt Spray bare 2-4 hours 72+ hours
Salt Spray oiled 24-48 hours 120+ hours
Thread Fit Impact None Minor
Light Reflection None (anti-glare) High
Best For Tooling, optics, aesthetics Outdoor / corrosive environments

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: 6H per ISO 965-1
  • Mechanical properties: Class 8 per ISO 898-2 (proof load stress 800 MPa)
  • Hardness: 200-302 HV
  • Dimensional tolerance: Grade A for M1.6-M16; Grade B for M18-M64
  • Surface treatment: Hot alkaline black oxide; coating thickness less than 1 micron
  • Post-treatment: Oil or wax coating to enhance corrosion resistance

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 ISO 898-2
Material Condition Quenched and Tempered -
Density 7.85 g/cm3 -
Operating Temperature -50 to +300 deg C -

Chemical Composition - Medium Carbon Steel

Element C Mn P S Si
Content 0.25-0.55% 0.50-1.65% max 0.045% max 0.045% max 0.40%

Typical Applications

  • Precision Machinery and Tooling - CNC machines, jigs, fixtures where anti-glare and dimensional precision are critical
  • Optical and Photographic Equipment - Camera rigs, telescope mounts; black finish eliminates stray light reflection
  • Automotive and Motorsport - Engine bays, chassis, roll cages requiring black aesthetics with Class 8 strength
  • Structural Steel Construction - High-strength bolted connections with Class 8.8 bolt assemblies
  • Architectural and Decorative Metalwork - Exposed connections, furniture, interior design requiring a premium black finish
  • Electronics and Enclosures - Control panels, server racks where black hardware is specified

Product Gallery - DIN 934 Hex Nut Black 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 surface treatment 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, RoHS, REACH compliance documents on request
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