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Tamperproof Attachment Hardware for Posts (2 bolts & 3 nuts): BoltGuard Anti-Theft Post Attachment Kit – 2 Bolts, 3 Tamperproof Nuts (K-KIT-BG) Learn More...

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Part# K-KIT-BG
Contents 2 steel one-way carriage bolts (5/16" x 2 1/2" long) with 3 Tamperproof Nuts (2 for Mounting, 1 for Installation)

Product Description

BoltGuard kit is equipped with 3 tamperproof nuts; 2 used to mount the sign and 1 for installing. Accompanied with 2, one-way security bolts for the optimal theft proof sign mounting solution.

  • Anti-theft hardware saves you time and money! Eliminate the need of replacing stolen signs with this low-cost invesment.
  • Sign mounting hardware is compatible with our signs (3/8" holes) and posts (u-channel and square).
  • Tamperproof nuts can be installed using a 7/8" wrench or an 8" adjustable wrench/pliers.
  • Tamperproof nut's bevelved edge and one-way security bolt prevents removal with ordinary tools. Sign can only be disengaged from the backside using the installaltion nut.
  • To install:
    1. Tighten first nut by hand onto the back of the sign post.
    2. Tighten the second nut, upside-down, on top of the first nut. The second nut locks with the first nut.
    3. Insert a wrench in between the two nuts and tighten until secure.
    4. When finished, remove second, top nut using a wrench leaving the first, bottom nut on the backside of the post. Save installation nut for next install or when you want to remove the sign.
0 Select Material:
Quantity / Price (Per Kit)
  • 2.5" x 0.3125"
  • Rigid Signs
  • Tamperproof Sign Attachment Hardware
Tamperproof Sign Attachment Hardware
May 11
(Hover for more details)
  • Kit is made of 2 one-way steel bolts and 3 tamperproof nuts made from 1008 case-hardened steel.
  • Bolts are 2.5" long and is designed to fit on our u-channel posts or square posts. Bolts are 5/16" in diameter and our compatible with our signs with 3/8" predrilled holes.
  • 3 tamperproof nuts are provided, 2 for mounting to your post and 1 for installation. Installation nut allows you to tighten bolt and securing sign to the post. Sign cannot be dismounted without using the 3rd installation nut.
  • One-way security bolts and beveled edge of the tamperproof nuts prevents removal with ordinary tools.
    More Material Details
0 Order Quantity:
Size:2.5" x 0.3125"
Material:Tamperproof Sign Attachment Hardware
Total Price
Per Kit
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Customer Reviews

Man User Icon
Apr 16, 2021

  Verified Purchase

Great item

Liked them.
Woman User Icon
Apr 13, 2021

  Verified Purchase

Accessories when needed

I appreciate the option to purchase additional parts when appropriate.
Woman User Icon
Apr 08, 2021

  Verified Purchase


Exactly what I needed.
Man User Icon
Apr 07, 2021

Size: 2.5" x 0.3125" Material Type: Sign Attachment Hardware - 2 Bolts & 3 Tamperproof Nuts   Verified Purchase

Worth it!

Great hardware! Really appreciate the extra nut. No one will mess with the sign now!
Woman User Icon
Apr 06, 2021

  Verified Purchase

These won't fall off!

These bolts worked great on a 2 x 2 metal post. Just had to drill the appropriate holes to mount the sign.