Lag Screws

• Category: Fasteners

  Product Description

  These 5/16-inch × 3-inch lag screws are designed for fastening compatible garage door brackets, track components, operator hardware, and other mounting components to suitable wood framing.

  Each screw features a 7/16-inch high-profile hex washer head. The integrated washer-style bearing surface helps distribute clamping force across the mounted component, while the hex head allows installation with a compatible socket or nut driver.

  The 3-inch length provides additional penetration for applications where a shorter lag screw is not appropriate. Proper fastener length, pilot-hole size, edge distance, substrate condition, and load requirements must be confirmed before installation.

  This listing includes 500 lag screws.

  Product Specifications

  Specification	Details
  Product type	Lag screw
  Nominal diameter	5/16 inch
  Length	3 inches
  Head style	High-profile hex washer head
  Hex-head size	7/16 inch
  Product number / SKU	759LS
  Package quantity	500 screws
  Product category	Garage door fasteners
  Manufacturer	Not specified
  Material grade	Not specified
  Surface finish	Not specified

  Common Garage Door Uses

  These lag screws may be used for compatible mounting applications involving:

  • Garage door vertical-track brackets
  • Flag brackets
  • Jamb brackets
  • Header brackets
  • Operator mounting brackets
  • Center-support brackets
  • Perforated-angle mounting assemblies
  • Residential garage door hardware
  • Other compatible components secured to suitable wood framing

  The correct fastener depends on the component, substrate, required embedment depth, installation instructions, and expected load.

  Do not assume that one lag-screw size is suitable for every garage door installation.

  High-Profile Hex Washer Head

  The high-profile hex washer head provides:

  • A raised hex surface for socket engagement
  • An integrated washer-style bearing area
  • Improved load distribution compared with a narrow head
  • Convenient installation using a compatible 7/16-inch socket or driver
  • Strong clamping contact against compatible brackets and hardware

  Use a properly fitting six-point socket whenever possible. A loose or incorrectly sized tool can round the head and make removal difficult.

  Compatibility and Substrate Requirements

  These lag screws are intended for installation into suitable wood framing or another substrate specifically approved for lag-screw attachment.

  Before installation, confirm:

  • The mounting component accepts a 5/16-inch fastener
  • The screw length is appropriate for the assembly
  • Adequate solid framing exists behind the mounting surface
  • The screw will not contact wiring, plumbing, glass, or hidden building components
  • The substrate is sound and free from rot, splitting, or severe damage
  • The required embedment depth can be achieved
  • The fastener meets the hardware manufacturer’s installation requirements

  Drywall, plaster, foam, siding, thin trim, and similar finish materials are not structural mounting substrates.

  The screw must engage suitable framing or an approved structural anchoring system.

  Important Length and Clearance Notes

  The stated 3-inch dimension refers to the nominal screw length.

  Before installing a 3-inch lag screw, inspect the mounting area for concealed:

  • Electrical wiring
  • Water or gas lines
  • Drain pipes
  • Low-voltage wiring
  • Glass
  • Metal framing
  • Masonry
  • Other obstructions

  Do not use a longer screw simply to increase holding strength without confirming that the substrate and hidden conditions are appropriate.

  Pilot-Hole Guidance

  A correctly sized pilot hole may help:

  • Reduce wood splitting
  • Keep the screw aligned
  • Lower installation torque
  • Prevent fastener-head damage
  • Improve thread engagement
  • Reduce the chance of breaking the screw

  Pilot-hole diameter and depth depend on the wood species, moisture content, fastener construction, edge distance, and installation requirements.

  The pilot hole should be smaller than the outside thread diameter so the threads can engage the surrounding wood.

  Do not rely on one universal pilot-hole size for every material or application.

  Installation Notes

  Before installation:

  1. Confirm the mounting location and framing.
  2. Verify that the bracket accepts a 5/16-inch screw.
  3. Check for hidden electrical, plumbing, and mechanical components.
  4. Position and level the bracket or track component.
  5. Mark the mounting-hole locations.
  6. Drill an appropriate pilot hole where required.
  7. Start the lag screw straight.
  8. Tighten it using a properly fitting 7/16-inch socket or nut driver.
  9. Stop when the washer head seats firmly against the hardware.

  Do not continue tightening after the head has firmly seated. Excessive torque can strip the wood, deform the bracket, damage the screw, or reduce holding strength.

  An impact driver can generate substantial torque very quickly. Use controlled settings and finish tightening carefully.

  Important Matching Notes

  Before ordering, verify all relevant specifications:

  • 5/16-inch nominal diameter
  • 3-inch length
  • 7/16-inch hex-head size
  • High-profile washer-head design
  • Required package quantity
  • Mounting-hole diameter
  • Substrate type
  • Required embedment depth

  Do not select the screw based only on overall appearance. Similar fasteners may use different diameters, thread patterns, head profiles, materials, finishes, or strength ratings.

  The manufacturer, material grade, finish, and corrosion rating are not identified in this listing. Confirm those properties before using the screws in an application requiring a specific engineering or environmental rating.

  Package Contents

  • 500 lag screws
  • 5/16-inch nominal diameter
  • 3-inch nominal length
  • 7/16-inch high-profile hex washer head

  Washers, anchors, brackets, drill bits, sockets, drivers, and other installation hardware are not included unless specifically stated.

  Safety Warning

  Improperly installed garage door hardware can loosen, shift, or detach during operation.

  Before fastening garage door tracks, brackets, or operator components:

  • Confirm that solid framing is present
  • Follow the garage door or opener manufacturer’s instructions
  • Use the required number and type of fasteners
  • Keep the track and hardware correctly aligned
  • Do not mount structural hardware to drywall alone
  • Do not drill where concealed wiring or plumbing may be present
  • Do not reuse damaged, bent, stripped, or heavily corroded fasteners

  Garage door springs, cables, drums, bottom brackets, and related parts may remain under extreme tension. Do not loosen or reposition tensioned components while installing fasteners.

  Professional installation is recommended when the framing, required fastener strength, mounting location, or garage door hardware configuration cannot be positively verified.

   5/16" × 3" Garage Door Lag Screws – 7/16" Hex Head, 500-Pack

  5/16-inch × 3-inch garage door lag screws with a high-profile 7/16-inch hex washer head. Sold as a 500-piece box for compatible mounting applications.