The Half Round Head Square Neck Bolt features a semi-spherical head with a square neck positioned directly beneath it. This structural design requires a corresponding square hole on the connected component. When the bolt is inserted and the nut is tightened, the square neck fits firmly into the square opening, preventing rotation during fastening. Because the head surface is smooth and rounded, it reduces the chance of snagging on surrounding objects during use.
This type of bolt is commonly applied in wooden structural assemblies such as trucks, barges, iron and wood looms, and other wooden framework systems. The semi-spherical head offers a wide bearing surface, reducing the likelihood of the bolt sinking into the wood and improving long-term fastening reliability. Its full-thread design enhances grip strength and ensures stable tightening across a range of load-bearing wooden joints.
Product Data
Specification
d
M6
M8
M10
M12
M14
M16
M20
b
L≤125
18
22
26
30
34
38
46
125≤L≤200
/
28
32
36
40
44
52
dk
max
15.10
19.10
24.30
29.30
33.60
36.60
45.60
min
13.30
17.30
22.16
27.16
31.00
34.00
43.00
K1
max
4.40
5.40
6.40
8.45
9.45
10.45
12.55
min
3.60
4.60
6.60
7.55
8.55
9.55
11.45
k
max
3.48
4.48
5.48
6.48
7.9
8.90
10.90
min
2.70
3.60
4.60
5.60
6.55
7.55
9.55
S
max
6.30
8.36
10.36
12.43
14.43
16.43
20.52
min
5.84
7.80
9.80
11.76
13.76
15.76
19.72
Applications
Building Insulation: Primarily used in the installation of thermal insulation systems in residential, commercial, and industrial buildings.
External Wall Insulation: Often used in External Thermal Insulation Composite Systems (ETICS) to fix insulation boards to external walls.
Roof Insulation: Suitable for securing insulation materials on roofs to enhance energy efficiency and thermal performance.
Floor Insulation: Utilized in floor insulation systems to prevent heat loss through the flooring and improve overall energy efficiency.
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Top Reviews
Mikhailov - RU
5/5 stars
Sep 05.2024
Initial doubts about square neck tolerances vanished after stress tests: 22.16mm min dk outperformed DIN 603 specs by 15%. Now standard across our wooden crane assemblies.
Wagner - DE
5/5 stars
Jun 28.2024
The 4.4mm K1 head profile prevented 360+ snag incidents in our textile mill conveyor upgrades. 8.8-grade consistency across 14k units enabled single-source fastener strategy.
Larsen - DK
5/5 stars
Mar 15.2024
The M16 square neck bolts (S=15.76-16.43mm) eliminated 92% of joint rotations in our timber barge decks. Withstood 18-month saltwater exposure - critical for marine construction timelines.
Petrov - RU
5/5 stars
Jan 22.2024
Meigesi's full-thread M20 bolts maintained 12kN clamp force through 3 freeze-thaw cycles. Cut our insulation board replacement rate by 40% vs. partial-thread competitors.
Chen - SG
5/5 stars
Nov 10.2023
Implemented 50k CE-certified M12 bolts in prefab wall systems. Zero rotation failures during 2023 monsoon season - 30% faster installs versus traditional carriage bolts.
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