Grade: 4.8grade, 8.8grade, 10.9grade

Standard: T/CECS 10390-2024

Material: Q235, 304L, 316L

Diameter: M6, M8

Product Detail | Technical Information | Packaging

Product Detail

Shanghai Metal Corporation is a professional manufacturer and supplier of Knocking Type Back Bolt with high quality and reasonable price.

Knocking Type Back Bolt are high-performance mechanical fasteners designed for secure structural connections in modern construction. Primarily used in curtain wall systems, they provide reliable anchoring for stone cladding (granite, marble), metal panels, and decorative elements through their unique expansion mechanism. These bolts feature immediate load-bearing capacity after installation, eliminating curing time required by chemical alternatives. Manufactured from corrosion-resistant 304/316L stainless steel or specially coated variants, they offer excellent durability in harsh environments. With tensile strength up to 15kN (M8 size) and superior vibration resistance, they outperform conventional expansion bolts in seismic applications. Their mechanical expansion principle ensures stable performance in dynamic conditions while maintaining material integrity. Widely applied in high-rise buildings, bridges, and tunnels, knock-in anchors combine installation efficiency with long-term structural reliability, making them the preferred choice for architects and engineers in demanding construction projects worldwide.

If you want to know more about Knocking Type Back Bolt price please feel free to contact us, we will reply you within 24 hours.

1. Standard: T/CECS 10390-2024
2. Diameter: M6, M8
3. Grade: 4.8grade, 8.8grade, 10.9grade, etc
4. Material: Q235, 304L, 316L
5. Surface Treatment: Passivation, Brightness, Galvanizing

1. Principle of mechanical expansion
2. Instant carrying capacity
3. Precise depth control
4. Anti seismic and anti loosening

1. Excellent tensile/shear performance
2. Adapt to complex substrates
3. High safety and load-bearing capacity
4. Strong corrosion resistance

1. Home decoration
2. Engineering construction
3. Mechanical equipment
4. Bridge engineering

Technical Information of Knocking Type Back Bolt:

Specifications	Thread nominal	Nominal length(mm)	Outer diameter of casing(mm)	Anchor depth(mm)	Flat pad thickness(mm)
M6*32	M6	32	10.5	15	1.5
M8*32	M8	32	12.5	15	1.5
M8*35	M8	35	12.5	15	1.5
M8*40	M8	40	12.5	17	1.5

Type	Bolt diameter	Tensile design value (kN)	Shear design value (kN)
M6 series	M6	4	8
M8 series	M8	8 or 15	15

Type	Drill diameter (mm)	Hole diameter (mm)	Effective anchoring depth (mm)	Applicable substrate thickness (mm)	Installation torque (Nm)
M6 series	11	14	6~30	≥20	10~15
M8 series	13	16	10~30	≥20	20

Packaging of Knocking Type Back Bolt:

Shanghai Metal Products are packed and labeled according to the regulations and customer's requests. Great care is taken to avoid any damage which might be caused during storage or transportation. In addition, clear labels are tagged on the outside of the packages for easy identification of the product I. D. and quality information.

1) Shanghai Metal Standard

2) Customization

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Knocking Type Back Bolt

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