Home » Torx Pan Head Screws (GB2672-2017 / ISO 14583) - Steel (4.8) - Bright Zinc Plated

Torx Pan Head Screws (GB2672-2017 / ISO 14583) - Steel (4.8) - Bright Zinc Plated

Torx Pan Head Screws — GB/T 2672-2017 / ISO 14583 | Steel Class 4.8 — Bright Zinc Plated (Cr3)

FULLERKREG general-purpose 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 low carbon steel C1008 with a bright zinc Cr3 (trivalent chromium) plating, these Class 4.8 fasteners offer a cost-effective solution for light-duty assemblies, consumer products, furniture, and general industrial applications where moderate strength and good corrosion protection are required. The RoHS-compliant Cr3 passivation ensures compliance with modern environmental regulations.

  • Material: Low Carbon Steel C1008
  • Surface Treatment: Bright Zinc Plated, Trivalent Chromium Passivation (Cr3 / Cr-III)
  • Strength Grade: Class 4.8
  • 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 ~18
M2.5 0.45 5.00 4.70 1.75 1.57 1.93 T8 0.90 2.50 ~35
M3 0.50 6.00 5.70 2.00 1.82 2.18 T10 1.10 3.00 ~60
M3.5 0.60 7.00 6.64 2.40 2.18 2.62 T15 1.30 3.50 ~100
M4 0.70 8.00 7.64 2.70 2.46 2.94 T20 1.50 4.00 ~155
M5 0.80 9.50 9.14 3.30 3.02 3.58 T25 1.90 5.00 ~290
M6 1.00 12.00 11.57 4.00 3.70 4.30 T30 2.30 6.00 ~530
M8 1.25 16.00 15.57 5.30 4.92 5.68 T40 3.00 8.00 ~1,250
M10 1.50 20.00 19.48 6.50 6.05 6.95 T50 3.80 10.00 ~2,800

* Unit weight values are approximate reference values for nominal length L=12mm. Low carbon 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 4.8 Low Carbon Steel

Property Requirement (Class 4.8)
Tensile Strength (Rm) Min. 420 MPa
Yield Strength (Rp0.2 / ReL) Min. 340 MPa
Elongation after fracture (A) Min. 14%
Hardness (Vickers) 130 – 220 HV
Material Low Carbon Steel C1008
Heat Treatment None (cold formed)

Surface Treatment — Bright Zinc Plated Cr3 (Trivalent Chromium Passivation)

Property Bright Zinc Cr3
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

Class 4.8 vs Higher Grades — When to Choose

Grade Tensile Strength Material Typical Use Cost
4.8 (this product) 420 MPa min. Low carbon steel C1008 Light-duty, consumer goods, furniture, general assembly Most economical
8.8 800 MPa min. Medium carbon / alloy steel General structural, machinery Moderate
10.9 1040 MPa min. Alloy steel 10B21, Q&T High-stress automotive, industrial Higher
A2-70 (Stainless) 700 MPa min. SUS304 Corrosion-resistant environments Higher

Selection Guide

Application Recommended Specification Reason
Consumer electronics & home appliances M2 – M5, Class 4.8, Bright Zinc Cr3 Economical, bright appearance, RoHS-compliant, Torx drive prevents cam-out on assembly lines
Furniture & cabinetry hardware M4 – M6, Class 4.8, Bright Zinc Cr3 Sufficient strength for light structural joints; bright zinc finish suits visible hardware
Plastic enclosures & housings M2 – M4, Class 4.8, Bright Zinc Cr3 Low carbon steel reduces risk of thread stripping in plastic; compact pan head profile
Light industrial equipment M4 – M8, Class 4.8, Bright Zinc Cr3 Cost-effective fastening for non-critical joints; zinc Cr3 provides indoor corrosion protection
Toys & recreational products M3 – M5, Class 4.8, Bright Zinc Cr3 RoHS compliance essential; bright finish; Torx drive for tamper-resistance
General assembly & OEM production M2 – M10, Class 4.8, Bright Zinc Cr3 Broad size range, consistent quality, bulk availability, competitive pricing

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 higher torque transmission than Phillips or slotted drives with reduced cam-out risk.
  • Mechanical property requirements for Class 4.8 are defined in ISO 898-1 and the corresponding GB/T 3098.1.
  • Low carbon steel C1008 is cold-formed without heat treatment; suitable for non-critical and light-duty fastening applications.
  • 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: Strength grade 4.8 marking may be omitted on small sizes where head space is insufficient.

Product Gallery

FULLERKREG Torx Pan Head Screws — Steel Class 4.8, Bright Zinc Plated Cr3

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

Why FULLERKREG

  • 🏭 Direct Manufacturer — Factory-direct pricing with no middlemen, ensuring the most competitive wholesale rates
  • 📐 Standard Compliance — Strictly manufactured to GB/T 2672-2017 & ISO 14583, with full dimensional inspection
  • 🔬 Quality Assured — Class 4.8 hardness and dimensional reports 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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