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These Great Old-Fashioned Square head lag bolts can give a much more traditional look.   Some of the square head lag bolts we sell are old stock and finish can vary from flat to glossy


500 piece discount = 20% off

1000 piece discount = 30% off

  • Plain Lag Bolts - grade 2, no finish, may have been oiled to keep from rusting.
  • Black Oxide, followed by an appropriate post-treatment, provides limited added corrosion protection to the surface of the metal, prolonging service and increasing the shelf-life of stored parts. 

Standard Thread Length - If you have a specific thread length you need please call to verify.  The minimum thread length shall be equal to one-half the nominal screw length plus 1/2" or 6”, whichever is less. Order your black lag bolts today!

Square Heads Lag Bolts

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Items 1 to 25 of 43 total

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  1. Square Socket Set

    standard square impact sockets set of 6 sockets
  2. 1/2" x 6" Square Lag - Black Oxide

    Square head lag bolts (ea.)
  3. 3/4" x 2.5" Square Lag - Plain

    3/4" x 2.5" square head lag bolts (ea.)
  4. 1/2" x 6" Square Lag - Plain

    Square head lag bolts (ea.)
  5. 7/16" x 5.25" Square Lag - Black Oxide

    Square head lag bolts (10 pcs.)
  6. 1/2" x 3" Square Lag - Black Oxide

    Square head lag bolts (25 pcs.)
  7. 3/8" x 4" Square Lag - Black Oxide

    Square head lag bolts (10 pcs.)
  8. 3/8" x 3.5" Square Lag - Black Zinc

    Square head lag bolts (10 pcs.)
  9. 5/16" x 5.5" Square Lag - Black Oxide

    Square head lag bolts (10 pcs.)
  10. 5/8" x 7" Square head lag bolts (ea.)

    Square head lag bolts (ea.)
  11. 1/2" x 2.5" Square Lags - Black Oxide

    Square head lag bolts (25 pcs.)
  12. 1/2" x 1.5" Square Lags - Black Oxide

    Square head lag bolts (25 pcs.)
  13. 1/2" x 1" Square Lags - Black Oxide

    Square head lag bolts (25 pcs.)
  14. 5/16" x 5" Square Lag - Black Oxide

    Square head lag bolts (10 pcs.)
  15. 3/16" x 7/8" Square head lag bolts - Big 3/8" head

    Square head lag bolts-3/8" head (10 pcs.)
  16. 1/4" x 5.5" Square Lag - Black Oxide

    Square head lag bolts (10 pcs.)
  17. 1/4" x 3" Square Lag - Black Oxide

    Square head lag bolts (100 pcs.)
  18. 1/4" x 2" Square Lag - Black Oxide

    Square head lag bolts (100 pcs.)
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Items 1 to 25 of 43 total

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