Bolts · Core Product

Hex Bolt — DIN 933 / 931 Carbon Steel Bolt

Name: Hex Bolt
Brand: Donghuang Hardware

The most universal structural fastener. Q195 carbon steel hex bolts in grades 4.8 / 8.8, black or zinc plated, with metric and UNC threads — for construction, machinery and general industrial assembly.

DIN 933 DIN 931 Free Samples FOB / CIF / EXW

Hex Carbon Steel 4.8 / 8.8 Black / Zinc Metric / UNC

Hex bolts are the backbone of structural and mechanical connections. Our range covers DIN 933 (full thread) and DIN 931 (partial thread) configurations in Q195 carbon steel, finished black or zinc plated. Both metric and UNC threads are supported, so the same bolt fits DIN/GB/JIS and ANSI-spec projects.

Material	Carbon steel Q195
Grade	4.8 / 8.8
Surface	Black (Black Oxide) · Zinc Plated
Size Range	M6–M13 common (e.g. M6, M10, M12, M13, 18×80mm); full range Custom sizes available
Standard	DIN 933 (full thread) · DIN 931 (partial thread)
Thread	Metric and UNC (unified coarse)
MOQ	Contact us for MOQ
Application	Steel structures, formwork, machinery assembly, general industrial and infrastructure fixing

Grade selection

Grade 4.8 covers general-purpose connections; grade 8.8 is the high-strength workhorse for structural and load-bearing joints (tensile strength ≈ 800 MPa). Choose surface by environment: black oxide for indoor/dry use, zinc plated for general outdoor corrosion resistance.

ISO 9001 CE SGS Factory Direct

Certification numbers and validity available on request from our team.

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