Home » DIN 7984 Low Head Socket Cap Screw Black Grade 8.8

DIN 7984 Low Head Socket Cap Screw Black Grade 8.8

FULLERKREG DIN 7984 Grade 8.8 Black Low Head Socket Cap Screws

FULLERKREG DIN 7984 Grade 8.8 Black Low Head Socket Cap Screws are medium-strength, cost-effective fasteners designed for general industrial applications where a low-profile head is required. Manufactured from 10B21 boron steel or 35# carbon steel with a black oxide surface treatment, these screws offer a professional appearance and moderate corrosion resistance at an economical price point. The reduced head height of DIN 7984 makes them ideal for assemblies where standard DIN 912 head height is too tall.

Product Specifications

  • Standard: DIN 7984
  • Strength Grade: 8.8
  • Material: 10B21 boron steel or 35# carbon steel
  • Tensile Strength: Min. 800 MPa
  • Yield Strength: Min. 640 MPa
  • Hardness: HRC 22–32 (HV 250–320)
  • Surface Treatment: Black oxide (blackening)
  • Thread Tolerance: 6g
  • Drive Type: Hexagon socket (Allen key)
  • Sizes Available: M3 – M20

Material — 10B21 Boron Steel / 35# Carbon Steel Chemical Composition (%)

FULLERKREG DIN 7984 Grade 8.8 low head cap screws are manufactured from 10B21 boron-alloyed steel or 35# medium carbon steel. All values are maximum unless a range is indicated.

Grade C Si (max) Mn P (max) S (max) B
10B21 0.18–0.23 ≤0.30 0.80–1.10 ≤0.030 ≤0.030 0.0005–0.003
35# Steel 0.32–0.39 0.17–0.37 0.50–0.80 ≤0.035 ≤0.035 —

Mechanical Properties — Grade 8.8 (DIN 7984)

The following mechanical properties apply to FULLERKREG DIN 7984 Grade 8.8 low head socket cap screws per ISO 898-1 requirements.

Property Requirement Unit
Tensile Strength (Rm) Min. 800 MPa
Yield Strength / Proof Load Stress (Rp0.2) Min. 640 MPa
Core Hardness 22–32 HRC
Surface Hardness (max) ≤36 HRC
Elongation after fracture (A) Min. 12 %
Reduction of area (Z) Min. 52 %
Thread Tolerance Class 6g —
Surface Treatment Black oxide (blackening) —

Key Features

  • Low profile head — reduced head height vs. DIN 912, ideal for space-constrained assemblies
  • Grade 8.8 strength — reliable medium-strength performance for general industrial use
  • 10B21 boron steel / 35# carbon steel — good machinability and consistent mechanical properties
  • Black oxide finish — professional appearance with moderate corrosion resistance
  • Cost-effective — economical choice for high-volume, non-critical fastening applications
  • ISO/TS16949 quality management — hardness test, tensile test, and PPAP report available on request

Applications

FULLERKREG DIN 7984 Grade 8.8 black low head cap screws are widely used in:

  • General machinery and equipment assembly
  • Furniture and fixture manufacturing
  • Electronics enclosures and thin-panel assemblies
  • Automotive interior and non-critical components
  • Industrial equipment and structural assemblies
  • Consumer products and appliances
  • Any application requiring a low-profile head with moderate strength

Dimensional Specifications — DIN 7984 (Unit: mm)

Thread (d) Pitch (p) Head Dia. dk Max. Head Dia. dk Min. Head Height k Max. Head Height k Min. Key Size s Key Depth t Min. Body Dia. ds Max. Body Dia. ds Min.
M3 0.5 5.68 5.32 1.65 1.35 2 0.7 3.00 2.86
M4 0.7 7.22 6.78 2.20 1.80 2.5 1.0 4.00 3.82
M5 0.8 8.72 8.28 2.75 2.25 3 1.1 5.00 4.82
M6 1.0 10.22 9.78 3.30 2.70 4 1.4 6.00 5.82
M8 1.25 13.27 12.73 4.40 3.60 5 2.0 8.00 7.78
M10 1.5 16.27 15.73 5.50 4.50 6 2.5 10.00 9.78
M12 1.75 18.27 17.73 6.60 5.40 8 3.0 12.00 11.73
M14 2.0 21.33 20.67 7.70 6.30 10 3.5 14.00 13.73
M16 2.0 24.33 23.67 8.80 7.20 10 4.0 16.00 15.73
M20 2.5 30.33 29.67 11.00 9.00 12 5.0 20.00 19.67

Packaging & Availability

  • Standard sizes M3 – M20 available in stock
  • Bulk carton packaging; custom packaging available
  • Custom lengths and special requirements accepted for large orders
  • PPAP report, material certificate, and test reports available on request

Download Specification

Quality Assurance

All FULLERKREG DIN 7984 Grade 8.8 black fasteners are manufactured under strict quality control procedures including:

  • Rockwell hardness test (HRC 22–32)
  • Tensile strength test (min. 800 MPa)
  • Dimensional inspection per DIN 7984
  • PPAP documentation available upon request

For wholesale pricing, bulk orders, or technical inquiries, please contact our sales team.

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