Heavy-Duty Wood Fastening
Designed with coarse threads and a strong hex head, providing excellent holding power in timber and structural wood applications.
ASME/ANSI B 18.2.1-9 Lobed Head Screws
- Standard: ASME/ANSI B 18.2.1-15
- Material: Stainless Steel
- Thread Size: 10#,1/4 – (1-1/4)
- Surface Treatment: Plain, Zinc Plated
- Min Order: 5000pcs
- Sample: Free sample (after quote)
- Delivery time: 30 – 45 Days
Product Overview
Product Application
ASME B18.2.1-15 Hex Lag Screws (Table 15) define the dimensional requirements for inch-series hex head lag screws, also known as hex lag bolts or coach screws. These fasteners feature a hexagonal head for wrench tightening and coarse wood screw threads designed for direct installation into wood or wood-based materials.
Hex lag screws are widely used in wood construction, timber structures, outdoor applications, and heavy-duty fastening projects where high withdrawal resistance and reliable clamping force are required.
ASME B18.2.1 covers dimensional specifications for various inch-series bolts and screws, including lag screws, with Table 15 specifically providing hex lag screw dimensions.
Draw
Specification
Hex Lag Screws vs Wood Screws
Thread Design
- Hex Lag Screws
Feature deep, coarse threads for strong wood engagement and high pull-out resistance, ideal for heavy-duty fastening. - Wood Screws
Use finer threads for general woodworking applications with moderate holding strength.
Head Design
- Hex Lag Screws
Hex head design allows wrench tightening, providing higher torque and stronger clamping force. - Wood Screws
Various drive styles support easy installation with common hand tools. - Strength & Application
- Hex Lag Screws
Designed for structural wood connections, such as timber frames, decks, and heavy wood assemblies. - Wood Screws
Suitable for furniture, cabinets, and general woodworking projects requiring lighter fastening.
Installation
- Hex Lag Screws
Require pilot holes and wrench installation for maximum strength and stability. - Wood Screws
Usually allow faster installation with screwdrivers or power tools.
Key Difference
- Hex Lag Screws focus on strength and structural performance, while Wood Screws focus on convenience and general-purpose woodworking.
Product Advantages
High Torque Installation
The hexagonal head allows wrench or socket tightening, delivering higher installation torque compared with traditional slotted or Phillips wood screws.
Standardized Dimensions
Manufactured according to ASME B18.2.1 Table 15 dimensional requirements for consistent fit, interchangeability, and reliable performance.
Common Questions
What is ASME B18.2.1-15?
ASME B18.2.1-15 refers to Table 15 of ASME B18.2.1, which specifies dimensional requirements for inch-series hex lag screws
Are hex lag screws the same as lag bolts?
Yes. Hex lag screws are commonly called lag bolts in the construction industry, although technically they are classified as screws because they engage directly with the material without a nut.
Can hex lag screws be used without nuts?
Yes. They are designed to be installed directly into wood or similar materials without nuts.
Can ASME B18.2.1-9 Lobed Head Screw be customized?
Yes. Manufacturers can provide customized materials, coatings, lengths, thread specifications, and packaging according to project requirements.
