Hex Lag Wood Screw Bolt

What items need to be inspected for Hex Lag Wood Screw Bolt? And how should they be inspected?Here are the contents and sampling standards of the daily inspections conducted by the factory.

1.Dimension measurement

The key dimensions of Hex Lag Wood Screw Bolt include the total length, the width of the opposite sides of the hexagonal head, the height of the hexagonal head, the pitch diameter, the shank diameter and the length.The measuring tools can include vernier calipers, thread gauge and projector.

2.Hardness testing

The surface of the screws needs to undergo carburizing treatment to achieve the effect of "hard outer and ductile inner".For each specification, take 3 samples and use a Vickers or Rockwell hardness tester to measure the surface hardness and the core hardness.

3.Thread integrity inspection

Use thread gauge to check whether the pitch diameter of the thread is within the tolerance range, and whether the thread profile is complete, and if there are any burrs or broken teeth.Inspect the surface of the thread with the naked eye or through a magnifying glass for any cracks or folding defects.

4.Torque and failure torque test

For each specification, 3 samples were taken and the maximum torque and breaking torque of the screws during the tightening process were measured using a torque tester.

5.Head strength test

For each specification, take 3 samples. Simulate the installation process by applying torque with the socket wrench, and check if the hexagonal head is deformed, slipping or cracked.

6.Material composition analysis

Use a spectral analyzer to test the chemical element composition of the screw material, ensuring that it meets the required material and alloy ratios as stipulated by the standards.

Usage scenario

Hex Lag Wood Screw Bolt are specifically designed for "heavy-duty wood connections". They can be used wherever it is necessary to securely fix wooden beams, columns, and metal components onto wood.

1.Wooden houses and wooden frame structures

The coarse threads of the hexagonal wood screws can firmly grip the wood fibers, and their anti-pulling force is several times that of ordinary nails. Moreover, when tightened with a wrench, the installation quality can be controlled.

2.Construction of terraces and decks

Hexagonal head wood screws are coated with hot-dip galvanizing or Dacromet coating, ensuring a long service life. The hexagonal heads can be tightened with a socket, making installation free from the worry of slipping.

3.Wooden stairs and handrails

The staircase bears the weight and impact of people, and thus requires extremely high uplift resistance. And hexagonal wood screws are much thicker than ordinary wood screws and possess extremely high uplift resistance.

4.Heavy wooden furniture and workbenches

Hex Lag Wood Screw Bolt with washers, when tightened, are very stable.

5.Connection between wood structure and concrete/steel structure

Hexagonal wood screws are inserted through the wooden beams and screwed into the expansion sleeves pre-embedded in the concrete or directly into the steel nuts, thus achieving a wood-concrete or wood-steel hybrid structure.