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Mechanical Fasteners

Hex Head Bolt

Double Ended Bolt

Round Head Bolt

Countersunk Head Bolt

Foundation Anchor Bolts

Self Tapping Metal Screws

Hexagon Lock Nut

Hex Flange Nut

Plain Washer

Spring Lock Washer

Bolt And Nut Assembly

Flange

Metal Self Drilling Screw

Spiral Wound Gasket

Steel Pipe Fitting

Pressure Vessel Dished Ends

Galvanized Seamless Steel Pipe

Forging And Casting

Compression Spring
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contact us
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Good price online

products details

Home > Products >
Hex Head Bolt
>
GB/T 5781-2025 Grade 4.8 Carbon Steel Hex Head Bolts Full Thread Hot Dip Galvanized Construction Fasteners
All Category

Mechanical Fasteners

Hex Head Bolt

Double Ended Bolt

Round Head Bolt

Countersunk Head Bolt

Foundation Anchor Bolts

Self Tapping Metal Screws

Hexagon Lock Nut

Hex Flange Nut

Plain Washer

Spring Lock Washer

Bolt And Nut Assembly

Flange

Metal Self Drilling Screw

Spiral Wound Gasket

Steel Pipe Fitting

Pressure Vessel Dished Ends

Galvanized Seamless Steel Pipe

Forging And Casting

Compression Spring
Contact Us
Fiona Hou
flrs@mechanical-fasteners.com
13384956386
Contact Now
GB/T 5781-2025 Grade 4.8 Carbon Steel Hex Head Bolts Full Thread Hot Dip Galvanized Construction Fasteners
  • name
  • name

GB/T 5781-2025 Grade 4.8 Carbon Steel Hex Head Bolts Full Thread Hot Dip Galvanized Construction Fasteners

Brand Name: FLRS or OEM
Model Number: FLRS-GB5781
MOQ: 1,000 Pieces
Price: USD 0.02-1.00 / Piece
Packaging Details: Plastic bags + cartons + plywood pallets (strapped and film-wrapped)
Payment Terms: T/T,L/C
Detail Information
Product Description
Detail Information
Place of Origin:
China
Certification:
ISO 9001
Standard:
GB/T 5781‑2025 (Hexagon Head Bolts, Product Grade C)
Material:
Carbon Steel
Property Class:
4.8
Thread:
Full Thread, Metric Coarse
Size Range:
M6 - M24
Head Style:
Hexagon Head
Surface Finish:
Plain, Zinc Plated, Hot Dip Galvanized
Tensile Strength:
400 MPa (min)
Yield Strength:
320 MPa (min)
Application:
Construction, Steel Structures, General Machinery
Supply Ability:
50 Tons per Month
Highlight:

Grade 4.8 Property Class

,

GB/T 5781 Standard Compliant

,

Hot Dip Galvanized Option

Product Description

GB/T 5781-2025 Hexagon Head Bolts Grade 4.8 Carbon Steel (Product Grade C)

Product Description

Attribute Specification
Product Name GB/T 5781-2025 Hexagon Head Bolt, Product Grade C
Standard GB/T 5781-2025 (Equivalent to ISO 4018:2022 / DIN 558)
Material Carbon Steel
Property Class 4.8
Thread Full Thread, Metric Coarse
Size Range M6 - M24 (Custom Sizes on Request)
Head Style Hexagon Head
Surface Finish Plain, Zinc Plated, Hot Dip Galvanized
Certification ISO 9001
Application Construction, Steel Structures, General Machinery
Available Packing Plastic bags + cartons + plywood pallets (strapped and film-wrapped)

Key Features

1. Grade 4.8 property class - minimum tensile strength 400 MPa and yield strength 320 MPa, a dependable choice for general-purpose fixing.
2. Full thread - the thread runs the whole length of the shank, so the bolt can be cut to size on site without losing grip.
3. Standard dimensions - manufactured to GB/T 5781-2025, interchangeable with ISO 4018:2022 and DIN 558 bolts of the same size.
4. Finish options - plain, zinc plated or hot dip galvanized, so you can pick the right corrosion protection for the job.
5. Economy grade C - made for non-critical connections, helps keep project cost under control.

Typical Applications

- Steel structure assembly and building frames.
- General machinery and equipment fixing.
- Scaffolding and temporary structures.
- Fencing, racks and storage systems.

Our Services

1. Quick response to inquiries, usually within 24 hours.
2. Full specification and size lists available on request.
3. Samples can be arranged before mass production.
4. On-time delivery with complete export documentation.
5. Customized packing, with photos sent before shipment.
6. Fair pricing with consistent quality.

Tags: 

hex head fasteners  

hexagon head bolt  

bolt with hex head

Good price online

Products Details

Home > Products >
Hex Head Bolt
>
GB/T 5781-2025 Grade 4.8 Carbon Steel Hex Head Bolts Full Thread Hot Dip Galvanized Construction Fasteners
All Category

Mechanical Fasteners

Hex Head Bolt

Double Ended Bolt

Round Head Bolt

Countersunk Head Bolt

Foundation Anchor Bolts

Self Tapping Metal Screws

Hexagon Lock Nut

Hex Flange Nut

Plain Washer

Spring Lock Washer

Bolt And Nut Assembly

Flange

Metal Self Drilling Screw

Spiral Wound Gasket

Steel Pipe Fitting

Pressure Vessel Dished Ends

Galvanized Seamless Steel Pipe

Forging And Casting

Compression Spring
GB/T 5781-2025 Grade 4.8 Carbon Steel Hex Head Bolts Full Thread Hot Dip Galvanized Construction Fasteners
  • name
  • name

GB/T 5781-2025 Grade 4.8 Carbon Steel Hex Head Bolts Full Thread Hot Dip Galvanized Construction Fasteners

Brand Name: FLRS or OEM
Model Number: FLRS-GB5781
MOQ: 1,000 Pieces
Price: USD 0.02-1.00 / Piece
Packaging Details: Plastic bags + cartons + plywood pallets (strapped and film-wrapped)
Payment Terms: T/T,L/C
Detail Information
Product Description
Detail Information
Place of Origin:
China
Brand Name:
FLRS or OEM
Certification:
ISO 9001
Model Number:
FLRS-GB5781
Standard:
GB/T 5781‑2025 (Hexagon Head Bolts, Product Grade C)
Material:
Carbon Steel
Property Class:
4.8
Thread:
Full Thread, Metric Coarse
Size Range:
M6 - M24
Head Style:
Hexagon Head
Surface Finish:
Plain, Zinc Plated, Hot Dip Galvanized
Tensile Strength:
400 MPa (min)
Yield Strength:
320 MPa (min)
Application:
Construction, Steel Structures, General Machinery
Minimum Order Quantity:
1,000 Pieces
Price:
USD 0.02-1.00 / Piece
Packaging Details:
Plastic bags + cartons + plywood pallets (strapped and film-wrapped)
Delivery Time:
7-15 days for stock sizes, 15-25 days for production
Payment Terms:
T/T,L/C
Supply Ability:
50 Tons per Month
Highlight:

Grade 4.8 Property Class

,

GB/T 5781 Standard Compliant

,

Hot Dip Galvanized Option

Product Description

GB/T 5781-2025 Hexagon Head Bolts Grade 4.8 Carbon Steel (Product Grade C)

Product Description

Attribute Specification
Product Name GB/T 5781-2025 Hexagon Head Bolt, Product Grade C
Standard GB/T 5781-2025 (Equivalent to ISO 4018:2022 / DIN 558)
Material Carbon Steel
Property Class 4.8
Thread Full Thread, Metric Coarse
Size Range M6 - M24 (Custom Sizes on Request)
Head Style Hexagon Head
Surface Finish Plain, Zinc Plated, Hot Dip Galvanized
Certification ISO 9001
Application Construction, Steel Structures, General Machinery
Available Packing Plastic bags + cartons + plywood pallets (strapped and film-wrapped)

Key Features

1. Grade 4.8 property class - minimum tensile strength 400 MPa and yield strength 320 MPa, a dependable choice for general-purpose fixing.
2. Full thread - the thread runs the whole length of the shank, so the bolt can be cut to size on site without losing grip.
3. Standard dimensions - manufactured to GB/T 5781-2025, interchangeable with ISO 4018:2022 and DIN 558 bolts of the same size.
4. Finish options - plain, zinc plated or hot dip galvanized, so you can pick the right corrosion protection for the job.
5. Economy grade C - made for non-critical connections, helps keep project cost under control.

Typical Applications

- Steel structure assembly and building frames.
- General machinery and equipment fixing.
- Scaffolding and temporary structures.
- Fencing, racks and storage systems.

Our Services

1. Quick response to inquiries, usually within 24 hours.
2. Full specification and size lists available on request.
3. Samples can be arranged before mass production.
4. On-time delivery with complete export documentation.
5. Customized packing, with photos sent before shipment.
6. Fair pricing with consistent quality.

Tags: 

hex head fasteners

hexagon head bolt

bolt with hex head

13359231060
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