5/16-18 Zamak 5 Tri-Groove tamper-resistant security nut
Dimensions of the 5/16-18 Tri-Groove tamper-resistant security nut
Standard hex nut compared with a 5/16-18 Zamak 5 Tri-Groove tamper-resistant security nut
Tri-Groove tamper-resistant security nut installed on a threaded bolt against wood
Two 5/16-18 Zamak 5 Tri-Groove tamper-resistant security nuts
Five 5/16-18 Zamak 5 Tri-Groove tamper-resistant security nuts
Eight 5/16-18 Zamak 5 Tri-Groove tamper-resistant security nuts
Twelve 5/16-18 Zamak 5 Tri-Groove tamper-resistant security nuts
Twenty-five 5/16-18 Zamak 5 Tri-Groove tamper-resistant security nuts
Fifty 5/16-18 Zamak 5 Tri-Groove tamper-resistant security nuts
One hundred 5/16-18 Zamak 5 Tri-Groove tamper-resistant security nuts
5/16-18 Zamak 5 Tri-Groove tamper-resistant security nut
Dimensions of the 5/16-18 Tri-Groove tamper-resistant security nut
Standard hex nut compared with a 5/16-18 Zamak 5 Tri-Groove tamper-resistant security nut
Tri-Groove tamper-resistant security nut installed on a threaded bolt against wood
Two 5/16-18 Zamak 5 Tri-Groove tamper-resistant security nuts
Five 5/16-18 Zamak 5 Tri-Groove tamper-resistant security nuts
Eight 5/16-18 Zamak 5 Tri-Groove tamper-resistant security nuts
Twelve 5/16-18 Zamak 5 Tri-Groove tamper-resistant security nuts
Twenty-five 5/16-18 Zamak 5 Tri-Groove tamper-resistant security nuts
Fifty 5/16-18 Zamak 5 Tri-Groove tamper-resistant security nuts
One hundred 5/16-18 Zamak 5 Tri-Groove tamper-resistant security nuts

5/16-18 Tri-Groove Tamper-Resistant Security Nuts

from $9.99

Industrial Security Fastener for Utilities & Commercial Applications

Tri-Groove tamper-resistant security nuts are designed to help deter unauthorized removal using standard hand tools Their unique tri-groove design requires a matching installation socket, making them ideal for utilities, schools, municipalities, commercial facilities, trailers, gates, and other security applications.

Specifications

Thread Size: 5/16”-18 UNC
Material: Natural Zamak 5 Zinc Alloy
Compatible Bolt Thread: 5/16”-18 UNC
Matching Installation Socket: Requires a #30 Tri-Groove Installation Socket (Sold Separately)
Reusable: Yes, with the matching #30 Tri-Groove Installation Socket.
Typical Applications: Electrical Panels, Utility Equipment, Commercial Fixtures, Signage, Municipal & Industrial Installations

Features

  • Manufactured from Natural Zamak 5 Zinc Alloy

  • Designed for industrial security applications

  • Requires a #30 Tri-Groove Installation Socket (Sold Separately)

  • Helps deter unauthorized removal

  • Suitable for indoor and outdoor installations

What’s Included

Each package includes:

  • 5/16”-18 Tri-Groove tamper-resistant nuts

  • Quantity varies by the option selected

Installation Notes

  • Requires a #30 Tri-Groove Installation Socket (sold separately)

  • Not compatible with standard hex sockets or wrenches

  • Confirm the bolt thread size before ordering

Important Notes

  • Intended for security applications rather than frequent removal

  • Product appearance may vary slightly by production batch

  • Choose the quantity needed from the product options

Pack Quantity:

Industrial Security Fastener for Utilities & Commercial Applications

Tri-Groove tamper-resistant security nuts are designed to help deter unauthorized removal using standard hand tools Their unique tri-groove design requires a matching installation socket, making them ideal for utilities, schools, municipalities, commercial facilities, trailers, gates, and other security applications.

Specifications

Thread Size: 5/16”-18 UNC
Material: Natural Zamak 5 Zinc Alloy
Compatible Bolt Thread: 5/16”-18 UNC
Matching Installation Socket: Requires a #30 Tri-Groove Installation Socket (Sold Separately)
Reusable: Yes, with the matching #30 Tri-Groove Installation Socket.
Typical Applications: Electrical Panels, Utility Equipment, Commercial Fixtures, Signage, Municipal & Industrial Installations

Features

  • Manufactured from Natural Zamak 5 Zinc Alloy

  • Designed for industrial security applications

  • Requires a #30 Tri-Groove Installation Socket (Sold Separately)

  • Helps deter unauthorized removal

  • Suitable for indoor and outdoor installations

What’s Included

Each package includes:

  • 5/16”-18 Tri-Groove tamper-resistant nuts

  • Quantity varies by the option selected

Installation Notes

  • Requires a #30 Tri-Groove Installation Socket (sold separately)

  • Not compatible with standard hex sockets or wrenches

  • Confirm the bolt thread size before ordering

Important Notes

  • Intended for security applications rather than frequent removal

  • Product appearance may vary slightly by production batch

  • Choose the quantity needed from the product options

Frequently Bought Together
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#30 Black Oxide Tri-Groove Installation Socket for 5/16-18, 3/8-16, 7/16-14, M8 & M10 Security Nuts
from $44.00
Pack Quantity:
#30 Chrome Tri-Groove Installation Socket for 5/16-18, 3/8-16, 7/16-14, M8 & M10 Security Nuts #30 chrome-plated Tri-Groove installation socket for tamper-resistant security nuts #30 chrome-plated Tri-Groove installation socket for tamper-resistant security nuts #30 chrome-plated Tri-Groove installation socket for tamper-resistant security nuts #30 chrome-plated Tri-Groove installation socket for tamper-resistant security nuts
#30 Chrome Tri-Groove Installation Socket for 5/16-18, 3/8-16, 7/16-14, M8 & M10 Security Nuts
from $44.00
Quantity:

Frequently Asked Questions

  • These 5/16-18 Tri-Groove security nuts require the #30 Tri-Groove Installation Socket.

  • They are commonly used to secure equipment, signs, utility enclosures, gates, electrical cabinets, and industrial machinery.

  • No. These security nuts require the matching Tri-Groove installation socket for proper installation and removal.

  • These 5/16-18 Tri-Groove security nuts are manufactured from Zamak 5 zinc alloy for strength, durability, and corrosion resistance.