Cheese Head Screws (GB65-2016 / DIN 84) — Marine Stainless Steel A4 (SUS316)

FULLERKREG cheese head screws (slotted cylindrical head machine screws) are manufactured to GB65-2016 and DIN 84 standards. Produced in Marine Stainless Steel A4 (SUS316), property class A4-70, with a passivated & bright-finished surface. The addition of molybdenum in SUS316 provides superior resistance to chloride-induced pitting and crevice corrosion, making these screws the preferred choice for marine, offshore, chemical processing, and harsh outdoor environments.

Product Specifications

Standard	GB65-2016 / DIN 84
Head Type	Cheese Head (Slotted Cylindrical Head)
Drive Type	Slotted
Material	Marine Stainless Steel A4 (SUS316 / 1.4401)
Property Class	A4-70
Surface Treatment	Passivated & Bright (Whitened)
Size Range	M1.6 – M10
Length Range	2 mm – 100 mm
Thread	Metric Coarse Thread (ISO 68-1)
Availability	Stock & Custom Lengths — Wholesale / Bulk Supply

Dimensional Data (GB65-2016 / DIN 84)

All dimensions in mm. Tolerances per GB65-2016 / DIN 84.

Thread d	Pitch p (mm)	Head Dia. dk (max)	Head Height k (max)	Slot Width n (ref)	Slot Depth t (min)	Length Range l (mm)	Unit Weight (g / pc, ref)
M1.6	0.35	3.2	1.6	0.4	0.45	2 – 16	~0.07
M2	0.40	4.0	2.0	0.5	0.60	3 – 20	~0.13
M2.5	0.45	5.0	2.5	0.6	0.70	3 – 25	~0.25
M3	0.50	6.0	3.0	0.8	0.85	4 – 30	~0.44
M4	0.70	8.0	4.0	1.0	1.10	5 – 40	~1.05
M5	0.80	10.0	5.0	1.2	1.30	6 – 50	~2.10
M6	1.00	12.0	6.0	1.6	1.60	8 – 60	~3.80
M8	1.25	16.0	8.0	2.0	2.00	10 – 80	~9.00
M10	1.50	20.0	10.0	2.5	2.50	12 – 100	~17.50

* Unit weights are reference values for nominal length screws. Actual weight varies by length. Contact FULLERKREG for weight-by-length data sheets.

Standard Length Series (mm)

Thread	Available Lengths (mm)
M1.6	2, 3, 4, 5, 6, 8, 10, 12, 16
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
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, 65, 70, 80
M10	12, 16, 20, 25, 30, 35, 40, 45, 50, 55, 60, 65, 70, 80, 90, 100

Selection Guide

Application	Recommended Size	Notes
Marine & offshore structures	M4 – M10	Mo content resists chloride pitting in seawater
Chemical processing equipment	M3 – M10	Superior resistance to acids and chlorides
Pharmaceutical & food grade	M3 – M8	A4 meets stringent hygiene and leaching standards
Coastal & outdoor installations	M4 – M10	Long-term corrosion resistance in salt-laden air
Electronics & precision instruments	M1.6 – M4	Non-magnetic option for sensitive environments
Swimming pools & water treatment	M4 – M10	Resists chlorinated water corrosion

Standard Notes

GB65-2016 is the Chinese national standard for slotted cheese head screws, technically equivalent to DIN 84 (superseded by ISO 1207, but widely referenced in industry). Key points:

• Thread tolerance: 6g (external thread)
• Head diameter tolerance: h13 (dk)
• Slot dimensions per GB/T 5279 / DIN 84 Table
• Mechanical properties per ISO 3506-1 (A4-70)
• Corrosion resistance: ≥ 500 hours salt spray (neutral, per ISO 9227) — significantly exceeding A2 grade
• Passivation treatment removes free iron and enhances the chromium oxide layer for maximum corrosion resistance
• A4 (SUS316) contains 2–3% molybdenum, providing superior pitting resistance index (PRE ≥ 24) vs. A2 (SUS304)

A4 vs. A2 — Why Upgrade to Marine Grade?

Property	A2 (SUS304)	A4 (SUS316)
Molybdenum Content	None	2 – 3%
Pitting Resistance (PRE)	~18	≥ 24
Salt Spray Resistance	≥ 200 hrs	≥ 500 hrs
Chloride Resistance	Moderate	Excellent
Property Class	A2-50	A4-70
Tensile Strength	≥ 500 MPa	≥ 700 MPa
Recommended Environment	General / Indoor	Marine / Chemical / Outdoor

Material & Mechanical Properties

Property	Value
Material Grade	A4 (SUS316 / 1.4401)
Property Class	A4-70
Tensile Strength (Rm)	≥ 700 MPa
0.2% Proof Stress (Rp0.2)	≥ 450 MPa
Elongation (A)	≥ 20%
Hardness	≤ 280 HV
Molybdenum Content	2.0 – 3.0%
Magnetic	Slightly magnetic (work-hardened); less than A2
Operating Temperature	-196°C to +300°C
Salt Spray Resistance	≥ 500 hours (ISO 9227, neutral salt spray)

Product Gallery

Product images — to be added manually.

Why Choose FULLERKREG?

🏭 Direct Manufacturer — Factory-direct pricing with full traceability from raw material to finished fastener.
📐 Standard Compliance — Every batch produced and inspected to GB65-2016 / DIN 84 dimensional and mechanical requirements.
🔬 Material Certified — Mill certificates (MTC), RoHS/REACH compliance, and ISO 3506-1 test reports available on request.
📦 Bulk & Custom Orders — MOQ flexible for wholesale; custom lengths, packaging, and labeling available.
🚢 Global Shipping — Experienced in export documentation, HS code classification, and international logistics.
💬 Technical Support — Engineering team available for application consultation, torque/clamping force data, and corrosion resistance guidance.