Torx Countersunk Screws (GB/T 2673-2000 / ISO 14581) — Stainless Steel A2

FULLERKREG Torx countersunk flat-head screws are manufactured to GB/T 2673-2000 and ISO 14581 standards. Featuring a 90° countersunk head with an internal Torx (TX) drive, these screws deliver superior torque transmission, reduced cam-out risk, and a flush-mount finish ideal for precision assemblies. Available in A2 (SUS 304) stainless steel with a passivated & whitened surface, strength grade A2-70.

Product Specifications

Attribute	Detail
Product Name	Torx Countersunk Flat Head Screws
Standard	GB/T 2673-2000 / ISO 14581
Drive Type	Torx (TX) Internal Drive
Head Type	Countersunk (Flat Head), 90° included angle
Material	A2 Stainless Steel (SUS 304)
Surface Treatment	Passivated & Whitened (Bright Finish)
Strength Grade	A2-70
Size Range	M2 – M10
Length Range	3 mm – 80 mm
Brand	FULLERKREG

Product Photo Gallery

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Dimensional Drawing

Per GB/T 2673-2000 / ISO 14581 — Countersunk head with 90° included angle, Torx recess depth t, head diameter dk, head height k, thread pitch p.

• Head angle: 90° (±1°)
• Torx recess: TX drive per ISO 10664
• Thread: Metric coarse thread per ISO 68-1
• Thread tolerance: 6g
• Head tolerance: h13

Dimensional Data

Thread d	Pitch p (mm)	TX Drive	Head Dia. dk max (mm)	Head Dia. dk min (mm)	Head Height k max (mm)	Head Height k min (mm)	Recess Depth t min (mm)	Recess Depth t max (mm)	Min. Thread Length b (mm)	Unit Weight (g / 100 pcs)
M2	0.40	TX6	3.80	3.50	1.20	0.96	0.70	1.00	12	—
M2.5	0.45	TX8	4.70	4.40	1.50	1.21	0.85	1.20	14	—
M3	0.50	TX10	5.60	5.30	1.65	1.35	1.00	1.40	16	—
M4	0.70	TX20	7.50	7.14	2.20	1.86	1.30	1.80	20	—
M5	0.80	TX25	9.20	8.84	2.50	2.16	1.50	2.10	22	—
M6	1.00	TX30	11.00	10.57	3.00	2.61	1.80	2.50	24	—
M8	1.25	TX40	14.50	14.07	4.00	3.54	2.30	3.20	28	—
M10	1.50	TX50	18.00	17.57	5.00	4.54	2.80	3.80	32	—

* All dimensions in mm. Tolerances per GB/T 2673-2000 / ISO 14581. Unit weight (g/100 pcs) to be updated upon batch confirmation.

Standard Length Range by Diameter

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

Selection Guide

Requirement	Recommendation
Flush surface finish required	Use countersunk head; ensure countersink angle matches 90°
High torque / anti-cam-out	Torx (TX) drive preferred over Phillips or slotted
Corrosion resistance (mild to moderate)	A2 (SUS 304) stainless steel, passivated
Food / medical / marine (light duty)	A2-70 suitable; consider A4 for severe marine environments
Thin material / sheet metal assembly	Select shorter length; verify countersink depth vs. material thickness
Structural / high-load application	Verify A2-70 tensile strength meets design load; consult engineer

Standard Reference

GB/T 2673-2000 is the Chinese national standard for countersunk head screws with Torx recess, technically equivalent to ISO 14581:2011. Key parameters defined by the standard:

• Head angle: 90° included angle (±1°)
• Drive recess: Torx (TX) per ISO 10664
• Thread: ISO metric coarse, tolerance class 6g
• Material designation: A2 (austenitic stainless steel, SUS 304 / 1.4301)
• Strength class: A2-70 (min. tensile strength 700 MPa for d ≤ M20)
• Surface: Passivated — no additional coating required for standard atmospheric corrosion resistance

Material & Mechanical Properties

Property	A2-70 Value
Material Grade	A2 (SUS 304 / 1.4301)
Min. Tensile Strength (Rm)	700 MPa
Min. 0.2% Proof Stress (Rp0.2)	450 MPa
Min. Elongation (A)	40%
Hardness	220 HV max
Corrosion Resistance	Excellent in atmospheric, mild chemical, and food-grade environments
Magnetic	Slightly magnetic after cold working
Operating Temperature	-196°C to +300°C

Packaging & Supply

Item	Detail
Standard Pack	100 pcs / bag, 1,000 pcs / box (varies by size)
MOQ	100 pcs (standard sizes); custom quantities available
Labeling	Size, standard, material, quantity — FULLERKREG brand label
Custom Packaging	Available on request (OEM / private label)
Lead Time	In-stock items: 1–3 business days; custom orders: 7–15 business days

Why FULLERKREG

🏭 Factory Direct — Manufactured in-house with full process control, no middlemen.
📐 Standard Compliant — Strictly per GB/T 2673-2000 / ISO 14581; third-party inspection available.
🔬 Material Certified — Mill certificates (MTC) provided; A2 SUS 304 composition verified per heat.
📦 Bulk Ready — Wholesale quantities from 100 pcs to millions; competitive tiered pricing.
🌍 Global Shipping — Export experience to 30+ countries; DDP / FOB / EXW terms available.
🔧 Technical Support — Engineering team available for selection guidance, drawings, and custom specs.