Home » Pozi Pan Head Screws (GB818-2016 / ISO 7045) - Steel (4.8) - Bright Zinc Plated

Pozi Pan Head Screws (GB818-2016 / ISO 7045) - Steel (4.8) - Bright Zinc Plated

Pozi Pan Head Screws (GB818-2016 / ISO 7045) — Steel Class 4.8, Bright Zinc Plated (Cr3)

FULLERKREG supplies precision-manufactured Pozi (Pozidriv) pan head machine screws conforming to GB818-2016 and ISO 7045. Produced in low-carbon steel to property class 4.8 with a bright zinc plating (Zinc Cr3, trivalent chromate passivation) surface finish, these screws offer reliable corrosion protection, a bright silver appearance, and excellent value for general-purpose industrial and commercial fastening applications.

Product Overview

Product Name Pozi Pan Head Machine Screws
Drive Type Pozidriv (Pozi / Type Z)
Head Type Pan Head (Cylindrical low-profile domed head)
Standards GB818-2016 / ISO 7045
Material Low-Carbon Steel
Property Class 4.8
Surface Treatment Bright Zinc Plated — Trivalent Chromate (Cr3) Passivation, RoHS Compliant
Coating Thickness ≥ 5 µm (standard); ≥ 8 µm available on request
Salt Spray Resistance ≥ 72 hours (white rust) per ISO 9227
Size Range M2 – M10
Length Range 3 mm – 80 mm
Thread Metric Coarse Thread (ISO 68-1)
Tolerance 6g (thread) per ISO 965-1
RoHS Compliance Yes — Cr3 (trivalent) chromate, hexavalent chromium (Cr6) free
Brand FULLERKREG

Product Gallery

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Dimensional Data (GB818-2016 / ISO 7045)

All dimensions in millimeters (mm). Verified against GB818-2016 and ISO 7045 standard tables. Note: nominal dimensions apply to the uncoated part; zinc plating adds ≤ 0.013 mm per side to head and shank diameters.

Thread
d		 Pitch
p (mm)		 Head Dia.
dk max (mm)		 Head Height
k max (mm)		 Drive No.
(Pozi)		 Drive Depth
m min (mm)		 Drive Width
b ref (mm)		 Length Range
l (mm)		 Unit Weight
(g / pc, ref.)
M2 0.40 4.0 1.6 Z1 0.7 2.3 3 – 20 0.07 – 0.46
M2.5 0.45 5.0 2.0 Z1 0.8 2.8 3 – 25 0.14 – 0.87
M3 0.50 6.0 2.4 Z1 1.0 3.5 4 – 30 0.23 – 1.55
M3.5 0.60 7.0 2.6 Z2 1.2 3.9 5 – 35 0.41 – 2.58
M4 0.70 8.0 3.1 Z2 1.4 4.6 5 – 40 0.62 – 4.35
M5 0.80 10.0 3.7 Z2 1.6 5.7 6 – 50 1.14 – 8.80
M6 1.00 12.0 4.6 Z3 2.0 6.8 8 – 60 2.28 – 16.10
M8 1.25 16.0 6.0 Z3 2.5 9.2 10 – 80 5.70 – 39.50
M10 1.50 20.0 7.5 Z4 3.0 11.5 12 – 80 11.40 – 67.50

* Unit weight values are reference only, calculated for carbon steel (density ≈ 7.85 g/cm³) including zinc coating. Actual weight may vary slightly by length and manufacturing tolerance. Full per-length weight tables available on request.

Available Length Series by Thread Size

Thread Standard Lengths Available (mm)
M2 3, 4, 5, 6, 8, 10, 12, 16, 20
M2.5 3, 4, 5, 6, 8, 10, 12, 16, 20, 25
M3 4, 5, 6, 8, 10, 12, 16, 20, 25, 30
M3.5 5, 6, 8, 10, 12, 16, 20, 25, 30, 35
M4 5, 6, 8, 10, 12, 16, 20, 25, 30, 35, 40
M5 6, 8, 10, 12, 16, 20, 25, 30, 35, 40, 45, 50
M6 8, 10, 12, 16, 20, 25, 30, 35, 40, 45, 50, 55, 60
M8 10, 12, 16, 20, 25, 30, 35, 40, 45, 50, 55, 60, 70, 80
M10 12, 16, 20, 25, 30, 35, 40, 45, 50, 55, 60, 70, 80

Surface Coating — Bright Zinc Plated (Cr3)

Parameter Specification Standard Reference
Plating Type Electrolytic Zinc (Bright) ISO 4042
Chromate Treatment Trivalent Chromate (Cr3) — Blue-bright / Silver ISO 4520 / RoHS
Coating Thickness ≥ 5 µm (standard); ≥ 8 µm on request ISO 4042 Class Fe/Zn 5
Salt Spray Resistance ≥ 72 h to white rust; ≥ 120 h available ISO 9227
Appearance Bright silver / blue-white, uniform finish —
RoHS Compliance Yes — Hexavalent chromium (Cr6) free EU RoHS 2011/65/EU
REACH Compliance Compliant — no SVHC above threshold EU REACH 1907/2006
Hydrogen Embrittlement Relief Baking at 200°C / 4 h post-plating (Class 4.8 — low risk) ISO 4042

Selection Guide

Application / Requirement Recommendation
General indoor / light outdoor assembly Class 4.8 BZP — cost-effective, adequate corrosion protection
Electronics enclosures & sheet metal M2–M4, short lengths; bright finish suits visible assemblies
Furniture & cabinetry M3–M5; pan head wide bearing surface prevents pull-through
Automotive interior / trim panels Cr3 BZP — RoHS compliant, no Cr6 concerns
High-torque / cam-out resistant drive Pozidriv (Pozi) — superior to Phillips under power tools
Flush or low-profile assembly Pan head — wide bearing surface, minimal protrusion above surface
Cost-sensitive bulk procurement Steel 4.8 BZP — most economical option in the GB818 / ISO 7045 range
Corrosive / marine / outdoor exposure Consider A2 or A4 stainless steel grades instead

Standard Notes

GB818-2016 is the Chinese national standard for cross recessed pan head screws, equivalent to and harmonized with ISO 7045:2011. Key standard provisions for this grade include:

  • Thread tolerance: 6g per ISO 965-1 (before plating); after plating per ISO 4042 allowance
  • Mechanical properties: Class 4.8 per ISO 898-1 — nominal tensile strength 400 MPa, proof load class 4
  • Pozidriv recess: Type Z (Pozi), conforming to ISO 4757
  • Head form: pan head with flat underside and rounded top profile
  • Fully threaded for lengths ≤ 38 mm (M3 and above); partially threaded for longer lengths per standard grip length tables
  • Surface coating: electrolytic zinc per ISO 4042; trivalent chromate (Cr3) passivation
  • Marking: not required for Class 4.8 sizes below M5

Mechanical Properties — Steel Class 4.8

Property Value / Specification Standard Reference
Property Class 4.8 ISO 898-1
Nominal Tensile Strength (Rm nom) 400 MPa ISO 898-1
Min. Tensile Strength (Rm min) 420 MPa ISO 898-1
Lower Yield Stress / Proof Load (Sp) 310 MPa ISO 898-1
Vickers Hardness 130 – 220 HV ISO 898-1
Material Low or medium carbon steel, no heat treatment required ISO 898-1
Density ≈ 7.85 g/cm³ —

Packaging & Supply

Thread Size Standard Pack Qty (pcs) MOQ (pcs) Bulk Packaging
M2 – M3 1,000 / 2,000 / 5,000 1,000 Poly bag in carton
M3.5 – M6 500 / 1,000 500 Poly bag in carton
M8 – M10 100 / 200 / 500 100 Poly bag in carton

* Custom packaging, labeling, and mixed-size kitting available for wholesale orders. Contact FULLERKREG for bulk pricing and lead times.

Why FULLERKREG

🏭 Direct Manufacturer — Produced in-house with full process control from wire drawing to zinc plating and finished fastener.
📐 Standard Compliance — Every batch manufactured and inspected to GB818-2016 / ISO 7045 dimensional and mechanical requirements.
🔬 Coating Quality Control — Salt spray testing per ISO 9227; coating thickness verified per ISO 4042 on every production lot.
📦 Wholesale Ready — Flexible MOQ, bulk pricing tiers, and OEM/private label options for distributors and industrial buyers.
🚢 Global Shipping — Export packaging and documentation (CO, packing list, inspection reports) for international orders.
✅ RoHS & REACH Compliant — Cr3 trivalent chromate only; full compliance documentation available on request.

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