HEX LAG SCREWS / LAG BOLTS (DIN 571)

HEX LAG SCREWS / LAG BOLTS (DIN 571)
Hex Lag screws,  commonly known as lag bolts, lag screws are some of the toughest fasteners.

These extremely sturdy fasteners are usually used to connect heavy lumber or other heavy materials that are bearing an intense load.These screws differ from normal wood, self-drilling or sheet metal screws.
Most lag screws are at least one inch long and ¼-inch thick.

Lag screws require a hole to be drilled first. Lag screws also use a nut to add extra strength and security to help hold things together. Used for intense load applications, lag screws can support a much heavier load than the average sheet metal or wood screw.

To install lag screws, the first step is to make sure that all of the materials involved in the application are aligned. To keep the materials in place once they are aligned, use clamps to hold. Once everything is secure, drill a pilot hole using a bit with a slightly smaller diameter than the lag screw that will be used. When drilling the hole, make sure to drill all the way through the area where the screw will eventually be.

Lag screws are also only available with hex heads while more common wood and sheet metal screws are available in multiple head types. With the sole option of a hex head, installation of the screw will require a nut driver or ratchet. A right driver bit and a power drill can be used to finish the tightening of the lag screw. The hex head lag screw is designed that way since hex headed fasteners are made to hold up in applications where a lot of torque is necessary.

Lag screws have sharp lead thread points and are available in Steel/Zinc, Stainless Steel, and Steel/Hot Dip Galvanized.

INTERNATIONAL STANDARDS

  • DIN 571
  • ANSI/ASME b18.2.1

APPLICATIONS

LAG screws or hex lag bolts are always used to the heavy lumber or wooden material connecting or other heavy materials that neededto bearthe extreme load.

MATERIAL

Material Available:

  • LOW CARBON STEEL : C1006 - C1045
  • STAINLESS STEEL: SUS304, SUS316, SUS410
  • GRADE 8.8: C1018 - C1022, 10B21
  • MILD STEEL / MID CARBON STEEL: C1035 - C1045
  • ALLOY STEEL: SCM435 - SCM440 (Grade 10.9, Grade 12.9)
  • Material according to customer’s specifications

SIZE RANGE

INCH Diameter: 1/ 4" - 5/ 8 " x Length: up to 8 " 

METRIC Diameter: M6 - M16 x Length: up to 200mm

SURFACE TREATMENT

SURFACE TREATMENT TYPES:

  • PLAIN ; NON-PLATED
  • HEAT TREATMENT
  • ZINC PLATED – WHITE ZINC / YELLOW ZINC / BLACK ZINC
  • Zinc trivalent coatings Cr3+ (Meet RoHS standards)
  • Zinc hexavalent zinc plating Cr6+
  • Nickel plating
  • Black Oxide
  • Black Phosphate
  • Hot Dip Galvanised
  • GEOMET® 500
  • DACROMET®
  • Passivation
  • All electro-plating, electro-coating and surface treatment specifications can meet customer's requirements.