Filter by
Drive Style
Thread Size
Material
Nut Type
Finish
Thread Direction
DFARS Specialty Metals
Export Control Classification Number (ECCN)
Thread Fit
About Nuts, Materials, and Finishes
More
Tamper-Resistant Tri-Groove Nuts

Tri-groove nuts are narrower than sloped and drilled spanner nuts to fit in tight spaces. Install with a tri-groove socket bit and either a drive handle or an open-end wrench (all sold separately). Use them to reduce the risk of unwanted removal for objects in public spaces such as signs, lighting fixtures, and displays.
Zinc-plated steel nuts are coated to protect the steel from corrosion in wet environments.
Zinc alloy nuts are lightweight and corrosion resistant in wet environments.
316 stainless steel nuts won’t corrode from water, chemicals, or salt spray.
For technical drawings and 3-D models, click on a part number.
Inch
Nuts | Tri-Groove Socket Bits | Drive Handles | Open-End Wrenches | ||||||||
---|---|---|---|---|---|---|---|---|---|---|---|
Thread Size | Dia. | Ht. | Pkg. Qty. | Pkg. | Each | Each | Each | ||||
Zinc-Plated Steel | |||||||||||
10-24 | 0.64" | 0.265" | 25 | 000000000 | 000000 | 0000000 | 000000 | 0000000 | 000000 | 000000 | 00 |
10-32 | 0.64" | 0.265" | 25 | 000000000 | 00000 | 0000000 | 00000 | 0000000 | 00000 | 000000 | 00 |
1/4"-20 | 0.64" | 0.265" | 25 | 000000000 | 00000 | 0000000 | 00000 | 0000000 | 00000 | 000000 | 00 |
5/16"-18 | 0.83" | 0.345" | 25 | 000000000 | 00000 | 0000000 | 00000 | 0000000 | 00000 | 000000 | 00 |
3/8"-16 | 0.83" | 0.345" | 25 | 000000000 | 00000 | 0000000 | 00000 | 0000000 | 00000 | 000000 | 00 |
316 Stainless Steel | |||||||||||
10-24 | 0.65" | 0.265" | 10 | 000000000 | 00000 | 0000000 | 00000 | 0000000 | 00000 | 000000 | 00 |
10-32 | 0.65" | 0.265" | 10 | 000000000 | 00000 | 0000000 | 00000 | 0000000 | 00000 | 000000 | 00 |
1/4"-20 | 0.66" | 0.265" | 10 | 000000000 | 00000 | 0000000 | 00000 | 0000000 | 00000 | 000000 | 00 |
1/4"-28 | 0.65" | 0.265" | 10 | 000000000 | 00000 | 0000000 | 00000 | 0000000 | 00000 | 000000 | 00 |
5/16"-18 | 0.83" | 0.345" | 10 | 000000000 | 00000 | 0000000 | 00000 | 0000000 | 00000 | 000000 | 00 |
5/16"-24 | 0.83" | 0.35" | 5 | 000000000 | 00000 | 0000000 | 00000 | 0000000 | 00000 | 000000 | 00 |
3/8"-16 | 0.83" | 0.345" | 10 | 000000000 | 00000 | 0000000 | 00000 | 0000000 | 00000 | 000000 | 00 |
3/8"-24 | 0.83" | 0.35" | 5 | 000000000 | 00000 | 0000000 | 00000 | 0000000 | 00000 | 000000 | 00 |
7/16"-14 | 0.83" | 0.34" | 1 | 000000000 | 0000 | 0000000 | 00000 | 0000000 | 00000 | 000000 | 00 |
1/2"-13 | 0.93" | 0.345" | 1 | 000000000 | 0000 | 00000000 | 00000 | 0000000 | 00000 | 000000 | 00 |
1/2"-20 | 0.93" | 0.345" | 1 | 000000000 | 0000 | 00000000 | 00000 | 0000000 | 00000 | 000000 | 00 |
5/8"-11 | 1.51" | 0.505" | 1 | 000000000 | 00000 | 0000000 | 000000 | 000000 | 00 | 0000000 | 000000 |
5/8"-18 | 1.51" | 0.505" | 1 | 000000000 | 00000 | 0000000 | 000000 | 000000 | 00 | 0000000 | 00000 |
3/4"-10 | 1.51" | 0.505" | 1 | 000000000 | 00000 | 0000000 | 000000 | 000000 | 00 | 0000000 | 00000 |
3/4"-16 | 1.51" | 0.505" | 1 | 000000000 | 00000 | 0000000 | 000000 | 000000 | 00 | 0000000 | 00000 |
Metric
Nuts | ||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|
Thread | Tri-Groove Socket Bits | Drive Handles | Open-End Wrenches | |||||||||
Size | Pitch, mm | Dia. | Ht. | Pkg. Qty. | Pkg. | Each | Each | Each | ||||
Zinc Alloy | ||||||||||||
M6 | 1 | 0.66" | 0.265" | 10 | 000000000 | 00000 | 0000000 | 000000 | 0000000 | 000000 | 000000 | 00 |
M8 | 1.25 | 0.83" | 0.345" | 10 | 000000000 | 0000 | 0000000 | 00000 | 0000000 | 00000 | 000000 | 00 |
316 Stainless Steel | ||||||||||||
M5 | 0.8 | 0.66" | 0.265" | 5 | 000000000 | 00000 | 0000000 | 00000 | 0000000 | 00000 | 000000 | 00 |
M6 | 1 | 0.66" | 0.265" | 5 | 000000000 | 00000 | 0000000 | 00000 | 0000000 | 00000 | 000000 | 00 |
M8 | 1 | 0.82" | 0.35" | 1 | 000000000 | 0000 | 0000000 | 00000 | 0000000 | 00000 | 000000 | 00 |
M8 | 1.25 | 0.82" | 0.35" | 5 | 000000000 | 00000 | 0000000 | 00000 | 0000000 | 00000 | 000000 | 00 |
M10 | 1.25 | 0.82" | 0.35" | 1 | 000000000 | 0000 | 0000000 | 00000 | 0000000 | 00000 | 000000 | 00 |
M10 | 1.5 | 0.82" | 0.35" | 1 | 000000000 | 0000 | 0000000 | 00000 | 0000000 | 00000 | 000000 | 00 |
M12 | 1.5 | 0.94" | 0.35" | 1 | 000000000 | 0000 | 00000000 | 00000 | 0000000 | 00000 | 000000 | 00 |
M12 | 1.75 | 0.94" | 0.35" | 1 | 000000000 | 0000 | 00000000 | 00000 | 0000000 | 00000 | 000000 | 00 |
M16 | 2 | 1.51" | 0.505" | 1 | 000000000 | 00000 | 0000000 | 000000 | 000000 | 00 | 0000000 | 000000 |