Tamperproof One Way Bolt Set - Y4900 and Y4901, Mounting Hardware by SafetySign.com

Tamperproof One Way Bolt Set

Use with any U-channel and Fiberglass Posts
Tamperproof One Way Bolt Set
Item #:
Y4900 and Y4901
Learn More Size:  
Learn More
Material:  
Packaging:  
Pricing See Complete Pricing Tables Y4900
Pkgs
Price Per Pkg:
Per Bolt Set
1+
$3.75
($1.88/ea)
Need a quote for a large order? Call 800-274-6271 or .
Qty:
Total Price: $3.75
✓ Added to Cart
Special freight arrangements are necessary. Learn more
Tamperproof One Way Bolt Sets are an ideal solution for helping to prevent theft of traffic, parking and property signs. Each set contains two 5/16” diameter one-way bolts, two breakaway nuts, two zinc coated washers, and two nylon washers for the sign face. These bolts can be used to mount signs with 3/8” mounting holes on U-Channel posts, composite posts, and square posts. 2" bolts are required for 1.12 lbs./ft. U-Channel posts and our composite fiberglass posts. 2-1/2" bolts are required for 1-3/4” square posts and 2 lbs./ft. U-channel posts with or without the addition of our sign saver plates. 3” bolts are required to mount signs on 2” square posts. A 5/8" socket and ratchet wrench will be needed to tighten the breakaway nuts down until they shear.
5/16 x 2″
Material Packaging Sku Quantity/Price
1+
Aluminum Sold in Packages of 2 - Includes 2 one-way bolts, 2 break away nuts, 2 nylon washers, 2 zinc plated washers Y4900 $3.75
5/16 x 2½″
Material Packaging Sku Quantity/Price
1+
Aluminum Sold in Packages of 2 - Includes 2 one-way bolts, 2 break away nuts, 2 nylon washers, 2 zinc plated washers Y4901 $3.95
Special Freight Arrangement: Due to the size of this product, freight shipping will be required. You may contact our customer service team for a quote or you can place your order and a customer service representative will contact you about freight shipping charges. If you would like to use your own freight carrier, please include your freight carrier account in the special instructions box at the bottom of the checkout page before placing your order. A customer service representative will be in contact with you if there are any questions.

Phone: 800-274-6271
Fax: 800-279-6897
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5/16″ Tamperproof Bolt Set

Tamperproof one-way bolts are an affordable solution for securing your signs and helping to prevent theft of your traffic, parking, and property signs. The unique design of the bolt head and breakaway nuts allows the both the bolts and nuts to be installed while making them almost impossible to remove without cutting tools.

What size bolts should I use with my U-Channel post?

POST SIZE Recommended Bolt Size
to Mount 1 Sign
with Sign Saver Plates
Recommended Bolt Size
to Mount 2 Signs
Back-to-Back with Sign Saver Plates
4 ft. U-Channel Post (2 lbs./ft.) 5/16″ × 2½″ 5/16″ × 2½″
6 ft. U-Channel Post (1.12 lbs./ft.) 5/16″ × 2″ 5/16″ × 2″
6 ft. U-Channel Post (2 lbs./ft.) 5/16″ × 2½″ 5/16″ × 2½″
8 ft. U-Channel Post (2 lbs./ft.) 5/16″ × 2½″ 5/16″ × 2½″
10 ft. U-Channel Post (2 lbs./ft.) 5/16″ × 2½″ 5/16″ × 2½″
12 ft. U-Channel Post (2 lbs./ft.) 5/16″ × 2½″ 5/16″ × 2½″

What size bolts should I use with my square post?

POST SIZE Recommended Bolt Size
to Mount 1 Sign
Recommended Bolt Size
to Mount 2 Signs Back-to-Back
6 ft. × 1¾″ Square Post 5/16″ × 2½″ 5/16″ × 2½″
8 ft. × 1¾″ Square Post 5/16″ × 2½″ 5/16″ × 2½″
8 ft. × 2″ Square Post 5/16″ × 3″ 5/16″ × 3″
10 ft. × 1¾″ Square Post 5/16″ × 2½″ 5/16″ × 2½″
12 ft. × 2″ Square Post 5/16″ × 3″ 5/16″ × 3″

What size bolts should I use with my fiberglass composite post?

POST SIZE Recommended Bolt Size
to Mount 1 Sign
Recommended Bolt Size
to Mount 2 Signs Back-to-Back
7 ft. Fiberglass Post 5/16″ × 2″ 5/16″ × 2″
8 ft. Fiberglass Post 5/16″ × 2″ 5/16″ × 2″

Installing Tamperproof Bolts

Tools required:

  1. Our Y4965 screwdriver with for one-way bolts.
  2. ⅝″ socket and ratchet wrench

Installation instructions:

  1. Place the sign on the square post where it meets your height requirement and line up the mounting holes with the holes on the post.
  2. Using our Y4901 or Y3551 bolt sets, insert a washer over the 5/16″ bolts and then insert the bolts into the mounting holes of the sign and through the post.
  3. Insert a washer on the other end of the bolt followed by the breakaway nut with the cone end facing the post.
  4. Tighten the nut down until it shears from the cone.

Optional:

  1. Add a pair of our ribbed sign saver plates that prevents the possibility of sign dimpling during bolt tightening.
Tamper resistant sign mounting hardware
Size Diameter Length Available Materials
5/16 x 2″ 5/16″ 2″
  • Aluminum
5/16 x 2½″ 5/16″ 2½″
  • Aluminum
Material Available
Sizes
Aluminum A lightweight durable metal material that will not rust, chip or crack. It's ability to resist corrosion makes it one of the best materials for outdoor use.
  • 5/16 x 2″
  • 5/16 x 2½″
 
None
Engineering Grade
High Intensity Prismatic
Diamond Grade
  NoneEngineering GradeHigh Intensity PrismaticDiamond Grade
ATSM D956 Type Type I Type IV Type IX
Brightness Standard Material 3x More 10x More
Night-Time Visibility 500' 1,000' 1,500'
Reflectivity
     
     
     
     

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