3/8-16 316 stainless steel Tri-Groove tamper-resistant security nuts
Dimensions of a 3/8-16 304 stainless steel Tri-Groove security nut
The difference between hex and tri-groove nuts
Tri-Groove tamper-resistant security nut installed on a threaded bolt against wood
Two 3/8-16 304 stainless steel Tri-Groove tamper-resistant security nuts
Five 3/8-16 304 stainless steel Tri-Groove tamper-resistant security nuts
Eight 3/8-16 304 stainless steel Tri-Groove tamper-resistant security nuts
Twelve 3/8-16 304 stainless steel Tri-Groove tamper-resistant security nuts
Twenty-five 3/8-16 304 stainless steel Tri-Groove tamper-resistant security nuts
Fifty 3/8-16 304 stainless steel Tri-Groove tamper-resistant security nuts
One hundred 3/8-16 304 stainless steel Tri-Groove tamper-resistant security nuts
3/8-16 316 stainless steel Tri-Groove tamper-resistant security nuts
Dimensions of a 3/8-16 304 stainless steel Tri-Groove security nut
The difference between hex and tri-groove nuts
Tri-Groove tamper-resistant security nut installed on a threaded bolt against wood
Two 3/8-16 304 stainless steel Tri-Groove tamper-resistant security nuts
Five 3/8-16 304 stainless steel Tri-Groove tamper-resistant security nuts
Eight 3/8-16 304 stainless steel Tri-Groove tamper-resistant security nuts
Twelve 3/8-16 304 stainless steel Tri-Groove tamper-resistant security nuts
Twenty-five 3/8-16 304 stainless steel Tri-Groove tamper-resistant security nuts
Fifty 3/8-16 304 stainless steel Tri-Groove tamper-resistant security nuts
One hundred 3/8-16 304 stainless steel Tri-Groove tamper-resistant security nuts

3/8"-16 Tri-Groove Security Nuts – 316 Stainless Steel

from $14.99

Industrial Security Fastener for Utilities & Commercial Applications

Protect equipment, fixtures, panels, signs, trailers, and other valuable property with durable 3/8"-16 Tri-Groove security nuts. Their specialized three-groove design helps discourage removal with ordinary tools, making them a practical choice for tamper-resistant and anti-theft applications.

Specifications

Thread Size: 3/8"-16 UNC
Material: Natural 316 Stainless Steel
Compatible Bolt Thread: 3/8"-16 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:

  • 3/8"-16 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

  • Available in multiple pack quantities

Pack Quantity:

Industrial Security Fastener for Utilities & Commercial Applications

Protect equipment, fixtures, panels, signs, trailers, and other valuable property with durable 3/8"-16 Tri-Groove security nuts. Their specialized three-groove design helps discourage removal with ordinary tools, making them a practical choice for tamper-resistant and anti-theft applications.

Specifications

Thread Size: 3/8"-16 UNC
Material: Natural 316 Stainless Steel
Compatible Bolt Thread: 3/8"-16 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:

  • 3/8"-16 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

  • Available in multiple pack quantities

Frequently Bought Together
#30 Black Oxide Tri-Groove Installation Socket for 5/16-18, 3/8-16, 7/16-14, M8 & M10 Security Nuts #30 black oxide Tri-Groove installation socket for tamper-resistant security nuts Two #30 black oxide Tri-Groove installation sockets Three #30 black oxide Tri-Groove installation sockets Four #30 black oxide Tri-Groove installation socket for tamper-resistant security nuts
#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 3/8-16 Tri-Groove security nuts require the #30 Tri-Groove Installation Socket for proper installation and removal.

  • They are commonly used on utility equipment, electrical enclosures, gates, signs, industrial machinery, trailers, and other applications where tamper-resistant fasteners help deter unauthorized removal.

  • No. Tri-Groove security nuts require the matching installation socket and cannot be installed or removed with standard wrenches or sockets.

  • These 3/8-16 Tri-Groove security nuts are manufactured from Zamak 5 zinc alloy for strength, durability, and corrosion resistance.