Hex Head Bolts (incl. Hex Flange) M8×40 8.8 Carbon Steel Zinc Plated

Specifications

Standard: GB/T 5782-2025 / GB/T 5783-2025 / GB/T 5785-2025 / GB/T 5786-2016 / GB/T 5789-1986
SKU: HB-001843
Nominal Diameter: M8
Length: 40 mm
Material: Carbon Steel
Grade: 8.8
Finish: Zinc Plated
Thread Pitch: 1.25
Unit Weight: 25 g/pc Total kit weight including all components
Type: Kit

Unit weight is a geometric estimate (base metal, coating excluded; HDG ≈ +4.5%); trade settlement by actual weight.

Quantity (pcs)Request a Quote

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Standard Basis

GB/T 5782-2025 / GB/T 5783-2025 / GB/T 5785-2025 / GB/T 5786-2016 / GB/T 5789-1986

Common equivalents below; confirm dimensions and drawing before substitution.

Spec Range

M8 × 40mm · 同族 201 个规格

This SKU is sourced per order; other lengths/materials in this family below.

Material & Grade

Carbon Steel · 8.8

Quenched & tempered, Rm≥800 MPa (Rp0.2=640), standard high-strength

Surface & Finish

Zinc Plated

Electro zinc: indoor rust protection, cost-first

Kit Contents (BOM)

Component SKU	Size	Material	Qty
HB-000274	M8×40	Carbon Steel	1
HN-000047	M8	Carbon Steel	1
FW-000052	M8	Carbon Steel	1

Standard Equivalents

Equivalence is based on published standard-family information (Identical = interchangeable; Equivalent = dimensions/tolerances may differ, verify drawings before substitution).

System	Standard	Equivalence	Note
GB	GB/T 5783-2025	Identical	Chinese hex head bolt standard family
DIN	DIN 933	Equivalent	Common commercial equivalent; confirm thread/detail on order
ISO	ISO 4017	Equivalent	Common commercial equivalent; confirm thread/detail on order
ГОСТ	ГОСТ Р ИСО 4017-2013	Equivalent	RF national standard adopting ISO 4017 (full thread hex bolt)
EN	EN 15048	Equivalent	EN 15048 covers non-preloaded structural bolting ASSEMBLIES (bolt + nut + washer set), not single bolts. This site supplies the bolt component to GB/T 5783 (size basis ISO 4014 / ISO 4017); set requirements are confirmed per drawing.
GB	GB/T 5782-2025	Identical	Chinese partially threaded hex bolt standard family
ISO	ISO 4014	Equivalent	Common commercial equivalent; confirm thread length on order
DIN	DIN 931	Equivalent	Common commercial equivalent; confirm thread length on order
ГОСТ	ГОСТ Р ИСО 4014-2013	Equivalent	RF national standard adopting ISO 4014 (partially threaded hex bolt)
GB	GB/T 5789-1986	Identical	Chinese hex flange bolt standard family
ISO	ISO 4162	Related standard	ISO 4162 is the small series (smaller dc and s, e.g. M12 dc 24.7 / s 15); different dimensional system, not interchangeable
DIN	DIN 6921	Related standard	dc identical size by size; s and k differ from M12 up (M12 s 18 vs 16, M14 21 vs 18, M16 24 vs 21); not interchangeable

Need another standard? Custom quote to your drawing →

Where It Fits

Heavy-Duty / Structural

8.8 quenched & tempered, equipment erection, structural joints, vibration duty

Custom to Drawing

Lengths/materials/grades not listed can be manufactured to drawing or standard

FAQ

MOQ and lead time?

Sourced per order or made to drawing. MOQ and lead time are confirmed at quote time by quantity, material and finish. Other sizes in this family are listed above; unlisted specs can be sourced to your drawing.

Can material or grade be substituted?

Current grade: Quenched & tempered, Rm≥800 MPa (Rp0.2=640), standard high-strength. Swapping grade/material changes strength and corrosion resistance (e.g. 8.8→10.9 raises strength, 304→316 raises chloride resistance), re-check design load and environment before substitution.

How do I choose the finish?

Electro zinc: indoor rust protection, cost-first. Other finishes (HDG, Dacromet, electro zinc) can be quoted on the same size.

Other Sizes in this Family

201 sizes total · current M8×40

M8 42 sizesOpen ▾

M8×12

Carbon Steel · 8.8 · Zinc Plated

Hex Head Bolts (incl. Hex Flange) M8×40 8.8 Carbon Steel Zinc Plated

Kit Contents (BOM)

Standard Equivalents

Where It Fits

Related Reading

FAQ

Other Sizes in this Family