Technical Specifications

DIN 7982 / ISO 7050 / GB/T 846 / ASME B18.6.3 Flat Head Tapping Screws Case Hardened, HV 450 min; A2-70/A4-70 Zinc Plated (Blue/White/Yellow), Black Zinc, Plain (SS)
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DIN 7982 / ISO 7050 / GB/T 846 / ASME B18.6.3 Flat Head Tapping Screws Case Hardened, HV 450 min; A2-70/A4-70 Zinc Plated (Blue/White/Yellow), Black Zinc, Plain (SS)
DIN 7982 / ISO 7050 / GB/T 846 / ASME B18.6.3 Flat Head Tapping Screws Case Hardened, HV 450 min; A2-70/A4-70 Zinc Plated (Blue/White/Yellow), Black Zinc, Plain (SS)
DIN 7982 / ISO 7050 / GB/T 846 / ASME B18.6.3 Flat Head Tapping Screws Case Hardened, HV 450 min; A2-70/A4-70 Zinc Plated (Blue/White/Yellow), Black Zinc, Plain (SS)

Standard

DIN 7982 / ISO 7050 / GB/T 846 / ASME B18.6.3

Specification

ST 2.2 - ST 9.5

Material

Case Hardened Steel, Stainless Steel (A2/A4)

Property Class

Case Hardened, HV 450 min; A2-70/A4-70

Finish

Zinc Plated (Blue/White/Yellow), Black Zinc, Plain (SS)

Product Description

90° countersunk head. Type C (Pointed tip) or Type F (Flat tip).

Technical Data & Drawings
Model: DIN 7982 / ISO 7050 / GB/T 846 / ASME B18.6.3 Flat Head Tapping Screws pdf
Dimension CodeSpecification (mm)
d
P
L
L (max)
L (min)
a (max)
dk (max)
dk (min)
k
No.
M
t (min)
t (max)

Technical Specifications

DIN 7982-1990 Flat Head Tapping Screws
Product No.
DIN 7982
Product Specification
ST2.2 * 6.5
Product Standard
DIN 7982-1990
Material Grade
—
Unit
mm
Mechanical Property
—
Dimension CodeSpecification (mm)Dimension CodeSpecification (mm)
dDiameterST2.2PPitch0.8
LLength6.5L(max)Lmax6.79
L(min)Lmin6.21a(max)amax0.8
dk(max)dkmax4.3dk(min)dkmin4
kHead Height1.3No.No.1
MM2.5t(min)tmin1.02
t(max)tmax1.32
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

Precision Fastening for Seamless Surfaces

1. Building Finishings & Interior Design

   Aluminum Window & Door Hardware:
    • Recommended: ST3.5 * 19 / ST4.2 * 25 | Stainless Steel A2 (SS304) | Plain or Powder Coated
    • Technical Insight: The 90-degree countersunk head sits flush with the hinge or handle surface, preventing snagging while providing a clean, aesthetic finish in architectural aluminum profiles.
   Cabinetry & Furniture Assembly:
    • Recommended: ST3.9 * 16 / ST4.8 * 32 | Carbon Steel | Zinc Plated (Blue/White)
    • Technical Insight: Ideal for joining thin wood panels to metal frames. The hardened tapping thread creates its own mating thread, significantly reducing assembly time compared to pre-drilled machine screws.

2. Electrical Enclosures & Consumer Electronics

   Control Panel Faceplate Mounting:
    • Recommended: ST2.9 * 9.5 / ST3.5 * 13 | Stainless Steel A2 or A4 | Polished
    • Technical Insight: Countersunk heads ensure that equipment stays flush, which is critical for panels requiring overlay membranes or touch interfaces. A4 (SS316) is suggested for outdoor or marine control boxes.
   PCB & Internal Component Securing:
    • Recommended: ST2.2 * 6.5 / ST2.9 * 9.5 | Carbon Steel | Black Zinc or Nickel Plated
    • Technical Insight: Small-diameter DIN 7982 screws are perfect for plastic housings. The sharp thread geometry provides high pull-out resistance without cracking the plastic boss.

3. HVAC & Sheet Metal Fabrication

   Ductwork & Ventilation Housing:
    • Recommended: ST4.2 * 13 / ST4.8 * 19 | Carbon Steel | Case Hardened & Zinc Plated
    • Technical Insight: Hardened steel threads allow the screw to penetrate thin-gauge galvanized sheets. The flat head design minimizes airflow resistance and prevents dust accumulation on the surface.
   External Air Conditioning Brackets:
    • Recommended: ST4.8 * 38 / ST5.5 * 50 | Stainless Steel A2-70 | Plain
    • Technical Insight: For vibration-prone outdoor units, the flush head prevents the fastener from interfering with the unit's casing, while SS304 ensures the connection remains rust-free despite exposure to the elements.

4. Marine & Automotive Interiors

   Boat Deck Fittings & Trim:
    • Recommended: ST4.2 * 25 / ST4.8 * 38 | Stainless Steel A4-80 (SS316) | Mirror Polished
    • Technical Insight: In high-salinity environments, A4 grade is mandatory. The countersunk design is essential for safety on deck, ensuring no protruding bolt heads cause tripping hazards.
   Vehicle Dashboard & Interior Plastic Trims:
    • Recommended: ST3.5 * 16 / ST4.2 * 20 | Carbon Steel | Black Phosphated
    • Technical Insight: Black phosphating provides a non-reflective surface that blends into automotive interiors, while the tapping thread ensures a tight grip in vibration-heavy environments.

Packaging & Delivery

Inner Packaging

   Packed in small transparent PE bags or branded color boxes. Typical quantity 500 or 1,000 pcs per unit.

Outer Carton

   Standard 25 kg neutral export cartons or customized EternalFast cartons.

Logistics

   Shanghai / Ningbo Port.

Quality & Certificates

Surface Hardness Test

   For case-hardened steel, we ensure a surface hardness of 450-750 HV for optimal tapping performance.

Drilling Performance

   100% test on steel plate penetration time according to DIN standards.

Material Traceability

   Full MTC (EN 10204 3.1) and RoHS compliance certification provided.