Tamperproof One Way Bolt Set
Use with any U-channel and Fiberglass Posts
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.
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5/16 x 2″
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| Material | Packaging | Sku | Quantity/Price | |
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| Aluminum | Sold in Packages of 2 - Includes 2 one-way bolts, 2 break away nuts, 2 nylon washers, 2 zinc plated washers | Y4900TS | $3.75 | |
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5/16 x 2½″
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| Material | Packaging | Sku | Quantity/Price | |
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| Aluminum | Sold in Packages of 2 - Includes 2 one-way bolts, 2 break away nuts, 2 nylon washers, 2 zinc plated washers | Y4901TS | $3.95 | |
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5/16 x 3″
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| Material | Packaging | Sku | Quantity/Price | |
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| Aluminum | Sold in Packages of 2 - Includes 2 one-way bolts, 2 break away nuts, 2 nylon washers, 2 zinc plated washers | Y3551 | $4.25 | |
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
Phone: 800-274-6271
Fax: 800-279-6897
SafetySign.com guarantees that we have the lowest price on every item we manufacture, plain and simple.
If you find a lower price, we'll match it!
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Frequently Purchased Together
Sign Bolting Set
Y4931, Y4899, Y3465, Y3550
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 |
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| 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″ |
| 10 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:
- Our Y4965 screwdriver with for one-way bolts.
- ⅝″ socket and ratchet wrench
Installation instructions:
- 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.
- Using our Y4901TS 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.
- Insert a washer on the other end of the bolt followed by the breakaway nut with the cone end facing the post.
- Tighten the nut down until it shears from the cone.
Optional:
- Add a pair of our ribbed sign saver plates that prevents the possibility of sign dimpling during bolt tightening.
| Size | Diameter | Length | Available Materials |
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| 5/16 x 2″ | 0.313″ | 2″ |
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| 5/16 x 2½″ | 0.313″ | 2 ½″ |
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| 5/16 x 3″ | 0.313″ | 3″ |
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| 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. |
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| None | Engineering Grade | High Intensity Prismatic | Diamond Grade | |
|---|---|---|---|---|
| ATSM D956 Type | – | Type I | Type IV | Type IX |
| Brightness | – | Standard | High | Maximum |
| Night-Time Visibility | – | 500' | 1,000' | 1,500' |
| Reflectivity |
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