Technical Specifications

DIN 7991 / ISO 10642 / GB/T 70.3 / ASME B18.3 Hex Socket Countersunk Head Screws 8.8, 10.9, 12.9 / A2-70, A4-70 Plain, Black Oxide, Zinc Plated, HDG, Geomet
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DIN 7991 / ISO 10642 / GB/T 70.3 / ASME B18.3 Hex Socket Countersunk Head Screws 8.8, 10.9, 12.9 / A2-70, A4-70 Plain, Black Oxide, Zinc Plated, HDG, Geomet
DIN 7991 / ISO 10642 / GB/T 70.3 / ASME B18.3 Hex Socket Countersunk Head Screws 8.8, 10.9, 12.9 / A2-70, A4-70 Plain, Black Oxide, Zinc Plated, HDG, Geomet
DIN 7991 / ISO 10642 / GB/T 70.3 / ASME B18.3 Hex Socket Countersunk Head Screws 8.8, 10.9, 12.9 / A2-70, A4-70 Plain, Black Oxide, Zinc Plated, HDG, Geomet

Standard

DIN 7991 / ISO 10642 / GB/T 70.3 / ASME B18.3

Specification

M3 - M24

Material

Carbon Steel / Stainless Steel (A2,A4)

Property Class

8.8, 10.9, 12.9 / A2-70, A4-70

Finish

Plain, Black Oxide, Zinc Plated, HDG, Geomet

Product Description

Fully threaded or partially threaded as per requirement

Technical Data & Drawings
Model: DIN 7991 / ISO 10642 / GB/T 70.3 / ASME B18.3 Hex Socket Countersunk Head Screws pdf
Dimension CodeSpecification (mm)
d
P
L
L (max)
L (min)
dk (max)
dk (min)
e (min)
k (max)
s (min)
s (max)
t (max)
t (min)

Technical Specifications

DIN 7991-1986 Hex Socket Countersunk Head Screws
Product No.
DIN 7991
Product Specification
M3 * 8
Product Standard
DIN 7991-1986
Material Grade
—
Unit
mm
Mechanical Property
8.8 / ISO 898-1
Dimension CodeSpecification (mm)Dimension CodeSpecification (mm)
dDiameterM3PPitch0.5
LLength8L(max)Lmax8.29
L(min)Lmin7.71dk(max)dkmax6
dk(min)dkmin5.7e(min)emin2.3
k(max)kmax1.7s(min)smin2.02
s(max)smax2.1t(max)tmax1.2
t(min)tmin0.95
Other Requirements
Technical Conditions
MaterialTypeSteelGeneral Technical ConditionsDIN 267-1
Grade
ThreadTolerance6gMechanical PropertyClass8.8
StandardDIN 13-12、DIN 13-15StandardISO 898-1
ToleranceProduct GradeASurface TreatmentPlating: DIN 267-9 如需其他表面处理，应由供需双方协议
StandardISO 4759-1
Surface RoughnessDIN 267-2Surface DefectDIN 267-19
Acceptance & PackingDIN 267-5Reference Weight per 1000 (kg)

Packaging & Delivery

  • Inner Packaging

Small box packaging (100-1000 pcs/box) or bulk plastic bags.

  • Outer Packaging

Standard export cartons (approx. 20-25kg/carton).

  • Palletization

Fumigation-free wooden pallets with stretch film wrapping.

  • Logistics Services

Supports FOB, CIF, DDP; Shanghai/Ningbo ports .

Quality & Certificates

  • Quality Inspection

100% thread Go/No-go gauge testing.

Tensile strength and hardness testing for high-grade bolts.

Salt spray test for corrosion resistance evaluation.

  • Certifications

ISO 9001:2015 Quality Management System.

MTR (Mill Test Report) provided for every batch.

CE / RoHS / SGS compliance available upon request.