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Tamper-Resistant Tri-Groove-Drive Steel Round Head Screws
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Good luck trying to force off these screws. The tri-groove drive has a sloped shape with three notches that makes it nearly impossible to grip without a tri-groove driver. They're often found on electrical boxes, machine control panels, and critical equipment where unauthorized access is a concern.
Length is measured from under the head.
Zinc-Plated Steel—A common choice for areas with occasional exposure to moisture.
Power Tool Bits—Pair these bits with your power tools to turn screws more quickly than manual tools.
Screws | Power Tool Bits | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
Head | |||||||||||
Lg. | Dia. | Ht. | Threading | Tensile Strength, psi | Pkg. Qty. | Pkg. | Each | ||||
Zinc-Plated Steel | |||||||||||
6-32 | |||||||||||
| 3/8" | 0.26" | 0.12" | Fully Threaded | 80,000 | 50 | 90058A146 | 000000 | 7309A22 | 000000 | ||
| 1/2" | 0.26" | 0.12" | Fully Threaded | 80,000 | 50 | 90058A148 | 00000 | 7309A22 | 00000 | ||
| 3/4" | 0.26" | 0.12" | Fully Threaded | 80,000 | 50 | 90058A151 | 00000 | 7309A22 | 00000 | ||
8-32 | |||||||||||
| 3/8" | 0.28" | 0.148" | Fully Threaded | 80,000 | 50 | 90058A192 | 00000 | 7309A22 | 00000 | ||
| 1/2" | 0.28" | 0.148" | Fully Threaded | 80,000 | 50 | 90058A194 | 00000 | 7309A22 | 00000 | ||
| 3/4" | 0.28" | 0.148" | Fully Threaded | 80,000 | 50 | 90058A197 | 00000 | 7309A22 | 00000 | ||
| 1" | 0.28" | 0.148" | Fully Threaded | 80,000 | 50 | 90058A199 | 00000 | 7309A22 | 00000 | ||
| 1 1/4" | 0.28" | 0.148" | Fully Threaded | 80,000 | 50 | 90058A201 | 00000 | 7309A22 | 00000 | ||
| 1 1/2" | 0.28" | 0.148" | Fully Threaded | 80,000 | 50 | 90058A203 | 00000 | 7309A22 | 00000 | ||
10-24 | |||||||||||
| 1/2" | 0.375" | 0.15" | Fully Threaded | 80,000 | 50 | 90058A242 | 00000 | 7309A22 | 00000 | ||
| 3/4" | 0.375" | 0.15" | Fully Threaded | 80,000 | 50 | 90058A245 | 00000 | 7309A22 | 00000 | ||
| 1" | 0.375" | 0.15" | Fully Threaded | 80,000 | 25 | 90058A247 | 0000 | 7309A22 | 00000 | ||
| 1 1/2" | 0.375" | 0.15" | Fully Threaded | 80,000 | 25 | 90058A251 | 0000 | 7309A22 | 00000 | ||
10-32 | |||||||||||
| 1/2" | 0.375" | 0.15" | Fully Threaded | 80,000 | 50 | 90058A829 | 00000 | 7309A22 | 00000 | ||
| 3/4" | 0.375" | 0.15" | Fully Threaded | 80,000 | 50 | 90058A831 | 00000 | 7309A22 | 00000 | ||
| 1" | 0.375" | 0.15" | Fully Threaded | 80,000 | 50 | 90058A833 | 00000 | 7309A22 | 00000 | ||
| 1 1/2" | 0.375" | 0.15" | Fully Threaded | 80,000 | 25 | 90058A836 | 0000 | 7309A22 | 00000 | ||
1/4"-20 | |||||||||||
| 1/2" | 0.375" | 0.155" | Fully Threaded | 80,000 | 50 | 90058A538 | 00000 | 7309A23 | 00000 | ||
| 3/4" | 0.375" | 0.155" | Fully Threaded | 80,000 | 50 | 90058A540 | 00000 | 7309A23 | 00000 | ||
| 1" | 0.375" | 0.155" | Fully Threaded | 80,000 | 25 | 90058A542 | 0000 | 7309A23 | 00000 | ||
| 1 1/2" | 0.375" | 0.155" | Fully Threaded | 80,000 | 25 | 90058A546 | 0000 | 7309A23 | 00000 | ||
| 2" | 0.375" | 0.155" | Fully Threaded | 80,000 | 25 | 90058A550 | 00000 | 7309A23 | 00000 | ||
| 2 1/2" | 0.375" | 0.155" | Partially Threaded | 80,000 | 10 | 90058A552 | 0000 | 7309A23 | 00000 | ||
5/16"-18 | |||||||||||
| 5/8" | 0.57" | 0.275" | Fully Threaded | 80,000 | 25 | 90058A580 | 00000 | 7309A24 | 00000 | ||
| 3/4" | 0.57" | 0.275" | Fully Threaded | 80,000 | 25 | 90058A581 | 00000 | 7309A24 | 00000 | ||
| 1" | 0.57" | 0.275" | Fully Threaded | 80,000 | 25 | 90058A583 | 00000 | 7309A24 | 00000 | ||
Tri-Groove Bits
 |
Overall | |||||||
|---|---|---|---|---|---|---|---|
For Screw Size | Lg. | Dia. | Material | Each | |||
For Power Tools | |||||||
1/4" Quick-Change Hex Shank Size | |||||||
| No. 1, No. 2, No. 3, No. 4 | 1 3/8" | 3/8" | Steel | 7309A21 | 000000 | ||
| No. 5, No. 6, No. 7, No. 8, No. 9, No. 10, No. 11 | 1 1/4" | 1/2" | Steel | 7309A22 | 00000 | ||
| No. 8, No. 9, No. 10, No. 11, No. 12, 1/4" | 1 1/4" | 7/8" | Steel | 7309A23 | 00000 | ||
| No. 12, 5/16" | 1 1/4" | 3/4" | Steel | 7309A24 | 00000 | ||
Tri-Groove Bit Sets
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The bits in these sets turn tri-groove screws. They're commonly used to fasten signs, lighting fixtures, and other types of public property.
Quick-Change Hex Shank—Lock these bits directly into power tools. They won't wobble as much as bits paired with an adapter, so they are the best choice for high-precision tasks.
High-Speed Steel—Harder and more heat resistant than plain steel. These bits withstand the intense friction of high-speed power tools without deforming or softening.
Components Included | Bits Included | Material | Container Type | Each | |||
|---|---|---|---|---|---|---|---|
For Power Tools | |||||||
1/4" Quick-Change Hex Shank Size | |||||||
| 4 Bits | Tri-Groove: 0.375" O'all Dia. for No. 1-No. 8 (1 3/8" O'all Lg.) Tri-Groove: 0.5" O'all Dia. for No. 5-No. 11 (1 1/4" O'all Lg.) Tri-Groove: 0.75" O'all Dia. for No. 12-No. 13, 5/16" (1 1/4" O'all Lg.) Tri-Groove: 0.875" O'all Dia. for No. 8-No. 12, 1/4" (1 1/4" O'all Lg.) | High-Speed Steel | Plastic Pouch | 7309A25 | 000000 | ||
