Hex Lag Screws

Standards

Complies with ASTM A307 Gr A, ASTM A449 (high-strength steel screws) and SAE J429 (mechanical properties).

Materials

Carbon Steel:Common for general use, often coated for corrosion resistance.
Stainless Steel (Grades 304/316): For outdoor or corrosive environments.
Hot-Dip Galvanized Steel: Enhanced rust resistance for heavy-duty applications.

Thread Types

Coarse Threads: For wood and soft materials.
Fine Threads: Less common, used in metal-to-wood applications.

Applications

Structural wood connections (beams, decks, retaining walls).
Heavy timber framing, utility poles, and outdoor projects.

Surface Treatments

Zinc Plating:Basic corrosion protection.
Hot-Dip Galvanizing: Durable coating for harsh environments.
Ceramic Coatings: Heat and chemical resistance.

Classification

hex lag screws are available in two variations based on their head design: with a washer face and without a washer face. Here’s a detailed breakdown:

1. Hex Lag Screws with Washer Face
Design: The hexagonal head includes an integrated, flat washer-like face beneath it. This design spreads clamping force over a wider area, reducing surface damage (e.g., wood splitting or metal deformation).
Applications: Ideal for direct installation into wood, metal, or composite materials without requiring a separate washer. Commonly used in structural projects like timber framing or decking.
Standards: Often comply with ASTM A449 or SAE J429 for load-bearing applications.

2. Hex Lag Screws without Washer Face
Design: The hexagonal head lacks an integrated washer, requiring a separate flat washer for installation.
Applications: Used when flexibility in washer selection is needed (e.g., thicker washers for soft materials or corrosion-resistant washers for harsh environments).
Standards: Compatible with the same material standards (e.g., stainless steel grades 304/316 or hot-dip galvanized coatings).

Key Differences

Load Distribution: Washer-face screws provide built-in load distribution, while non-washer-face types rely on added washers.
Installation Efficiency: Washer-face screws save time by eliminating the need for a separate washer.
Material Compatibility: Non-washer-face screws allow customization (e.g., using nylon or copper washers for insulation or corrosion resistance).

Both types are widely used in construction, woodworking, and heavy-duty outdoor projects, with selection depending on structural needs and installation conditions.

Materials

Product Services

1.After-sales quality control: After finished product inspection, ensure that it meets customer requirements.

2.Cooperation services: We can provide customers with OEM and ODM services to customize products to ensure that customer requirements are met.