Home » Torx Pan Head Screws (GB2672-2017 / ISO 14583) - Marine Stainless Steel (A4)

Torx Pan Head Screws (GB2672-2017 / ISO 14583) - Marine Stainless Steel (A4)

Torx Pan Head Screws — GB/T 2672-2017 / ISO 14583 | Marine Stainless Steel A4 (SUS316)

FULLERKREG A4 marine-grade 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). Constructed from A4 (SUS316) stainless steel with added molybdenum content, these fasteners offer superior resistance to chloride corrosion, pitting, and crevice corrosion — making them the preferred choice for marine, coastal, chemical, and food-processing environments where A2 stainless steel is insufficient.

  • Material: A4 Marine Stainless Steel (SUS316)
  • Surface Treatment: Passivated & Whitened
  • Strength Grade: A4-70
  • 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

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 ~36
M3 0.50 6.00 5.70 2.00 1.82 2.18 T10 1.10 3.00 ~61
M3.5 0.60 7.00 6.64 2.40 2.18 2.62 T15 1.30 3.50 ~102
M4 0.70 8.00 7.64 2.70 2.46 2.94 T20 1.50 4.00 ~158
M5 0.80 9.50 9.14 3.30 3.02 3.58 T25 1.90 5.00 ~295
M6 1.00 12.00 11.57 4.00 3.70 4.30 T30 2.30 6.00 ~540
M8 1.25 16.00 15.57 5.30 4.92 5.68 T40 3.00 8.00 ~1,270
M10 1.50 20.00 19.48 6.50 6.05 6.95 T50 3.80 10.00 ~2,850

* Unit weight values are approximate reference values for nominal length L=12mm. A4 (SUS316) density is approximately 7.98 g/cm³, slightly higher than A2. 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

A4 vs A2 — Why Choose Marine Grade?

Property A2 (SUS304) A4 (SUS316)
Chromium Content 17–19% 16–18%
Molybdenum Content None 2–3% (key differentiator)
Chloride Resistance Moderate Excellent
Pitting Resistance Moderate Superior
Crevice Corrosion Resistance Moderate Superior
Strength Grade A2-70 A4-70
Typical Applications Indoor, general purpose Marine, coastal, chemical, food-grade

Selection Guide

Application Recommended Specification Reason
Marine / boat fittings & deck hardware M4 – M8, A4-70, Passivated Molybdenum addition resists saltwater chloride attack and pitting
Coastal outdoor structures M4 – M10, A4-70, Passivated Long-term corrosion resistance in salt-laden air environments
Food processing & beverage equipment M3 – M8, A4-70 SUS316 meets hygiene requirements; resists acidic cleaning agents
Chemical plant & industrial equipment M4 – M10, A4-70 Resistance to a wide range of corrosive chemicals and process fluids
Swimming pool & water treatment facilities M4 – M8, A4-70, Passivated Chlorinated water resistance; prevents rust staining on surfaces
Precision electronics in humid environments M2 – M4, A4-70 Miniature size with enhanced corrosion protection over A2

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.
  • A4 stainless steel is defined in ISO 3506-1 as austenitic stainless steel with molybdenum addition (SUS316 / 316L equivalent).
  • Strength grade A4-70 indicates minimum tensile strength of 700 MPa per ISO 3506-1.
  • Marking: Products are marked with the manufacturer identification and strength grade A4-70 where size permits.

Product Gallery

FULLERKREG Torx Pan Head Screws — A4 Marine Stainless Steel, Passivated Finish

[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 Certified — A4 (SUS316) marine stainless steel with material test reports (MTR) and mill certificates available on request
  • 📦 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
Sorry, this collection is empty.
Continue shopping