Technical Specifications

DIN 7504K / ISO 15480 / GB/T 15856.1 Hex Washer Head Self Drilling Screws Surface Hardness ≥ 560 HV ; Core Hardness 320-400 HV Zinc Plated (Blue/White/Yellow), Ruspert, Dacromet, Magni
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DIN 7504K / ISO 15480 / GB/T 15856.1 Hex Washer Head Self Drilling Screws Surface Hardness ≥ 560 HV ; Core Hardness 320-400 HV Zinc Plated (Blue/White/Yellow), Ruspert, Dacromet, Magni
DIN 7504K / ISO 15480 / GB/T 15856.1 Hex Washer Head Self Drilling Screws Surface Hardness ≥ 560 HV ; Core Hardness 320-400 HV Zinc Plated (Blue/White/Yellow), Ruspert, Dacromet, Magni
DIN 7504K / ISO 15480 / GB/T 15856.1 Hex Washer Head Self Drilling Screws Surface Hardness ≥ 560 HV ; Core Hardness 320-400 HV Zinc Plated (Blue/White/Yellow), Ruspert, Dacromet, Magni

Standard

DIN 7504K / ISO 15480 / GB/T 15856.1

Specification

ST2.9 - ST6.3

Material

Case Hardened Steel / Stainless Steel (304/316) + Steel Tip (Bi-metal)

Property Class

Surface Hardness ≥ 560 HV ; Core Hardness 320-400 HV

Finish

Zinc Plated (Blue/White/Yellow), Ruspert, Dacromet, Magni

Product Description

Hex drive with integrated washer (flange). Drill point #1 to #5 available.

Technical Data & Drawings
Model: DIN 7504K / ISO 15480 / GB/T 15856.1 Hex Washer Head Self Drilling Screws pdf
Dimension CodeSpecification (mm)
d
P
L
L (max)
L (min)
a (max)
h (min)
dc (max)
dc (min)
e (min)
k (max)
k (min)
r (max)
s (max)
s (min)
Drilling plate thickness (min)
Drilling plate thickness (max)
z (max)

Technical Specifications

DIN 7504K-1995 Hex Washer Head Self Drilling Screws
Product No.
DIN 7504K
Product Specification
ST2.9 * 9.5
Product Standard
DIN 7504K-1995
Material Grade
—
Unit
mm
Mechanical Property
—
Dimension CodeSpecification (mm)Dimension CodeSpecification (mm)
dDiameterST2.9PPitch1.1
LLength9.5L(max)Lmax9.79
L(min)Lmin9.21a(max)amax1.1
h(min)hmin0.4dc(max)dcmax6.3
dc(min)dcmin5.8e(min)emin4.28
k(max)kmax2.8k(min)kmin2.5
r(max)rmax0.4s(max)smax4
s(min)smin3.82Drillingplatethickness(min)Drillingplatethicknessmin0.7
Drillingplatethickness(max)Drillingplatethicknessmax1.9z(max)zmax6.25
hHeight0.4
Other Requirements
Technical Conditions
MaterialTypeSteelGeneral Technical Conditions
Grade
ThreadToleranceMechanical PropertyClass
StandardStandard
ToleranceProduct GradeSurface Treatment
Standard
Surface RoughnessSurface Defect
Acceptance & PackingReference Weight per 1000 (kg)

Industrial Applications

DIN 7504K Self-Drilling Screws with Hexagon Washer Head | Industrial Applications

1. Steel Structure & Roofing Systems

  • Metal Roof Panel Fastening:Recommended: ST4.8 * 25 / ST5.5 * 38 | Case Hardened Steel | Ruspert Coating (1000H Salt Spray)Technical Insight: Designed for fixing metal sheets to steel purlins without pre-drilling. The Ruspert coating offers superior acid rain resistance, essential for industrial roofing longevity.
  • Composite Sandwich Panel Installation:Recommended: ST5.5 * 75 / ST6.3 * 125 | Carbon Steel Grade 5 | Zinc Plated + EPDM WasherTechnical Insight: The integrated EPDM washer creates a watertight seal, preventing leakage and thermal bridging. The long drill point (Tek 5) can penetrate steel thicknesses up to 12mm in a single operation.

2. HVAC & Ductwork Systems

  • Ventilation Duct Assembly:Recommended: ST4.2 * 13 / ST4.8 * 19 | Stainless Steel A2 (SS304) | Bi-MetalTechnical Insight: Bi-metal construction (SS304 body with a carbon steel drill tip) combines the corrosion resistance of stainless steel with the drilling capacity needed for galvanized steel ducts, preventing "tea staining" in humid environments.
  • External AC Unit Brackets:Recommended: ST5.5 * 25 / ST5.5 * 32 | Grade 1022A Steel | Blue Zinc PlatedTechnical Insight: Provides a high-torque, vibration-resistant connection for outdoor equipment mounting. The hex head ensures no-slip driving with power tools on construction sites.

3. Solar Energy & Prefabricated Buildings

  • Solar Panel Rail Mounting (to Steel Beams):Recommended: ST6.3 * 25 / ST6.3 * 50 | Grade 10.9 Equivalent | Hot Dip Galvanized (HDG)Technical Insight: High-tensile self-drilling screws ensure the solar racking remains secure under extreme wind uplift. The hex washer head distributes the clamping force evenly across the aluminum rail.
  • Container House Chassis Assembly:Recommended: ST5.5 * 38 / ST6.3 * 45 | Case Hardened | Zinc PhosphatedTechnical Insight: Ideal for rapid assembly of light-gauge steel frames. Phosphating provides a stable surface for subsequent painting or coating of the modular unit.

4. Automotive & Transport Infrastructure

  • Truck Trailer Body Paneling:Recommended: ST4.8 * 16 / ST5.5 * 25 | Stainless Steel 410 (Hardenable) | PassivatedTechnical Insight: SS410 is magnetic and heat-treatable, allowing it to drill through tough steel frames while maintaining better corrosion resistance than carbon steel in transit environments.
  • Sound Barrier Wall Fixation:Recommended: ST6.3 * 32 / ST6.3 * 50 | Carbon Steel | Green/Grey GeometTechnical Insight: Geomet coating is chrome-free and hydrogen-embrittlement-free, making it the eco-friendly choice for public infrastructure projects requiring high durability and salt-spray resistance.

Packaging & Delivery

Packaging

Standard EternalFast heavy-duty 25kg cartons. Small-box packaging (500/1000 pcs) is available for retail markets in Europe and North America.

Palletizing

800-1000kg per pallet, plastic-wrapped with four corner protectors.

Logistics

Shanghai / Ningbo Port.


Quality & Certificates

Drilling Speed

Every batch must pass the 1,200 RPM / 1,800 RPM drilling test according to ISO 15480.

Corrosion Resistance

Zinc plated (48h SST) or Ruspert 1000h/2000h for high-corrosion environments.

Documentation

MTC 3.1, SGS Inspection Report, and RoHS Compliance.