Home » Torx Pan Head Screws (GB2672-2017 / ISO 14583) - Alloy Steel (10.9) - Zinc Cr3

Torx Pan Head Screws (GB2672-2017 / ISO 14583) - Alloy Steel (10.9) - Zinc Cr3

Torx Pan Head Screws — GB/T 2672-2017 / ISO 14583 | Alloy Steel Class 10.9 — Zinc Plated Cr3 (Trivalent)

FULLERKREG high-strength Torx pan head screws (hexalobular socket pan head screws) are manufactured to GB/T 2672-2017 and the equivalent international standard ISO 14583:2011(MOD). Made from alloy steel 10B21 with a trivalent chromium (Cr3) zinc plating, these fasteners deliver Class 10.9 tensile strength combined with enhanced corrosion protection and RoHS-compliant surface treatment — the preferred choice for automotive, electronics, and industrial applications requiring both high strength and environmental compliance.

  • Material: Alloy Steel 10B21
  • Surface Treatment: Zinc Plated, Trivalent Chromium Passivation (Cr3 / Cr-III)
  • Strength Grade: Class 10.9
  • Drive Type: Torx / Hexalobular (T-drive)
  • Head Type: Pan Head
  • Standards: GB/T 2672-2017 / ISO 14583:2011(MOD)
  • Size Range: M2 – M10
  • Thread: Metric coarse thread (ISO 68-1), tolerance class 6g
  • RoHS Compliance: Yes — Cr3 trivalent passivation contains no hexavalent chromium (Cr6+)

Dimensional Data (GB/T 2672-2017 / ISO 14583)

All dimensions in mm. Data verified against GB/T 2672-2017 and ISO 14583:2011 standard tables.

Thread
d		 Pitch
p (mm)		 Head Dia.
dk max (mm)		 Head Dia.
dk min (mm)		 Head Height
k nom (mm)		 Head Height
k min (mm)		 Head Height
k max (mm)		 Torx
Size		 Drive Depth
t min (mm)		 Shank Dia.
ds max (mm)		 Unit Weight
(g / 100 pcs)*
M2 0.40 4.00 3.70 1.50 1.35 1.65 T6 0.70 2.00 ~19
M2.5 0.45 5.00 4.70 1.75 1.57 1.93 T8 0.90 2.50 ~36
M3 0.50 6.00 5.70 2.00 1.82 2.18 T10 1.10 3.00 ~62
M3.5 0.60 7.00 6.64 2.40 2.18 2.62 T15 1.30 3.50 ~103
M4 0.70 8.00 7.64 2.70 2.46 2.94 T20 1.50 4.00 ~160
M5 0.80 9.50 9.14 3.30 3.02 3.58 T25 1.90 5.00 ~298
M6 1.00 12.00 11.57 4.00 3.70 4.30 T30 2.30 6.00 ~545
M8 1.25 16.00 15.57 5.30 4.92 5.68 T40 3.00 8.00 ~1,280
M10 1.50 20.00 19.48 6.50 6.05 6.95 T50 3.80 10.00 ~2,870

* Unit weight values are approximate reference values for nominal length L=12mm. Alloy steel density approx. 7.85 g/cm³; zinc plating adds negligible weight. Actual weight varies by length. Contact FULLERKREG for precise weight data by length.

Shank Length Tolerance (ISO 14583 / GB/T 2672-2017)

Nominal Length l (mm) Tolerance +/- (mm)
4 – 6 0.20
6 – 10 0.25
10 – 16 0.30
16 – 25 0.35
25 – 35 0.40
35 – 50 0.50
50 – 60 0.60

Mechanical Properties — Class 10.9 Alloy Steel

Property Requirement (Class 10.9)
Tensile Strength (Rm) Min. 1040 MPa
Yield Strength (Rp0.2) Min. 940 MPa
Elongation after fracture (A) Min. 9%
Hardness (Vickers) 320 – 380 HV
Hardness (Rockwell) 33 – 39 HRC
Material Alloy Steel 10B21 (boron-alloyed)
Heat Treatment Quenched & Tempered

Surface Treatment — Zinc Cr3 (Trivalent Chromium Passivation)

Property Zinc Cr3 (Trivalent)
Passivation Type Trivalent chromium (Cr-III), no hexavalent Cr6+
RoHS Compliance Yes — fully compliant
REACH Compliance Yes
Appearance Bright silver / light blue iridescent
Zinc Plating Thickness Typically 5 – 12 μm
Salt Spray Resistance (base metal) Min. 72 hours (per ISO 9227)
Salt Spray Resistance (white rust) Min. 48 hours (per ISO 9227)
Standard Reference ISO 4042, GB/T 5267.1

Zinc Cr3 vs Other Surface Treatments

Surface Treatment Corrosion Resistance RoHS Appearance Typical Use
Zinc Cr3 (Trivalent) Good (72+ hrs salt spray) Yes Bright silver / blue iridescent Automotive, electronics, general industrial
Black Oxide Mild (oil-dependent) Yes Matte black Aesthetics-driven, indoor assemblies
Passivated (Stainless) Excellent (A2/A4) Yes Bright silver Corrosive environments, food-grade

Selection Guide

Application Recommended Specification Reason
Automotive body & chassis assemblies M4 – M10, Class 10.9, Zinc Cr3 RoHS-compliant zinc plating meets OEM environmental requirements; high clamping force
Consumer electronics & appliances M2 – M5, Class 10.9, Zinc Cr3 Bright appearance, RoHS compliance, Torx drive prevents cam-out in production lines
Power tools & electric motors M3 – M6, Class 10.9, Zinc Cr3 High tensile strength for dynamic loads; zinc coating protects against workshop humidity
Industrial machinery & equipment M5 – M10, Class 10.9, Zinc Cr3 Superior strength over 8.8 grade; zinc Cr3 provides corrosion protection in factory environments
Bicycle & sporting goods M4 – M6, Class 10.9, Zinc Cr3 High strength-to-weight ratio; bright silver finish suits visible components
Structural & load-bearing joints M6 – M10, Class 10.9, Zinc Cr3 Meets high preload requirements; Torx T30–T50 for precise torque control

Standard Notes

  • GB/T 2672-2017 is the Chinese national standard for hexalobular socket pan head screws, equivalent to and modified from ISO 14583:2011.
  • Covers sizes M2 through M10 with nominal lengths from 3 mm to 60 mm (size-dependent).
  • Thread tolerance: 6g per ISO 965-1.
  • Torx drive sizes follow ISO 10664. The hexalobular recess provides significantly higher torque transmission than Phillips or slotted drives.
  • Mechanical property requirements for Class 10.9 are defined in ISO 898-1 and the corresponding GB/T 3098.1.
  • Material 10B21 is a boron-alloyed steel optimized for cold heading and heat treatment to achieve Class 10.9 properties.
  • Zinc plating and Cr3 passivation comply with ISO 4042 and GB/T 5267.1. Trivalent chromium (Cr3) passivation contains no hexavalent chromium (Cr6+) and is fully RoHS and REACH compliant.
  • Marking: Products are marked with the manufacturer identification and strength grade 10.9 where size permits.

Product Gallery

FULLERKREG Torx Pan Head Screws — Alloy Steel Class 10.9, Zinc Cr3 Plated

[Product Image 1] [Product Image 2] [Product Image 3] [Product Image 4]

Why FULLERKREG

  • 🏭 Direct Manufacturer — Factory-direct pricing with no middlemen, ensuring competitive wholesale rates
  • 📐 Standard Compliance — Strictly manufactured to GB/T 2672-2017 & ISO 14583, with full dimensional inspection
  • 🔬 Material & Surface Certified — Class 10.9 hardness reports and Cr3 RoHS compliance certificates available on request
  • ♻️ RoHS & REACH Compliant — Trivalent Cr3 zinc plating meets EU and international environmental regulations
  • 📦 Bulk & Custom Orders — Flexible MOQ; custom packaging, labeling, and length combinations available
  • 🌍 Global Export — Experienced in international shipping with full export documentation support
  • ⚡ Fast Quotation — RFQ response within 24 hours for standard and non-standard specifications
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