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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 Sockets
Black-Oxide Steel
 |  |  |
Square Drive | 1" Hex Drive Size, Standard Clearance | Tri-Groove Socket |
Standard Clearance | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
Drive Size | OD | Socket Shape | For Drive Style | For Fastener Type | For Screw Size (Head Dia.) | For Nut Size (Dia.) | Overall Lg. | Each | |||
1/4" Square Drive | |||||||||||
| No. 4 | 31/64" | Tri-Groove | Tri-Groove | Screws | No. 4 Rounded (0.13") No. 6 Flat (0.268") | — | 1" | 7393A34 | 000000 | ||
| No. 6 | 31/64" | Tri-Groove | Tri-Groove | Screws | No. 6, No. 8 Rounded (0.208") No. 8, No. 10 Flat (0.372") | — | 1" | 7393A35 | 00000 | ||
| No. 10 | 31/64" | Tri-Groove | Tri-Groove | Screws and Nuts | 1/4", No. 10, No. 12 Rounded (0.334") 1/4" Flat (0.492") | No. 6, No. 8 (0.406") | 1" | 7393A36 | 00000 | ||
3/8" Square Drive | |||||||||||
| No. 20 | 47/64" | Tri-Groove | Tri-Groove | Screws and Nuts | 5/16" Rounded (0.585") | No. 10, 1/4" (0.661") | 1" | 7393A37 | 00000 | ||
| No. 30 | 31/32" | Tri-Groove | Tri-Groove | Nuts | — | 3/8", 5/16" (0.864") | 1 1/4" | 7393A38 | 00000 | ||
| No. 40 | 31/32" | Tri-Groove | Tri-Groove | Nuts | — | 1/2" (0.93") | 1 1/4" | 7393A101 | 00000 | ||
1" Hex Drive Size | |||||||||||
| 1" | 1 5/8" | Tri-Groove | Tri-Groove | Nuts | — | M16, M20 (0.625", 16 mm, 18 mm, 0.75", 20 mm) | 2" | 7393A43 | 000000 | ||
Steel
| |
Square Drive | Tri-Groove Socket |
Hex Drive Size—Hex-drive sockets are specialty sockets that require the use of another 1" socket when used with a ratchet wrench.
Standard Clearance | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|
Drive Size | OD | Socket Shape | For Drive Style | For Fastener Type | For Nut Size (Dia.) | Overall Lg. | Each | |||
1/2" Square Drive | ||||||||||
| 1/2" | 1 1/4" | Tri-Groove | Tri-Groove | Nuts | 1/2", M12, M14 (12 mm, 0.5", 14 mm) | 1 1/4" | 7393A42 | 000000 | ||
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
 |
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 | ||
Tri-Groove Socket Sets
Black-Oxide Steel
 | |
No. of Pieces | Components Included | Includes | Socket Shape | Drive Size | Each | |||
|---|---|---|---|---|---|---|---|---|
1/4" Square Drive | ||||||||
| 4 | 1 Drive Tool 3 Sockets | Standard: No. 4 (For No. 4 Standard Screws and No. 6 Countersunk Screws) Standard: No. 6 (For Nos. 6 and 8 Standard Screws and Nos. 8 and 10 Countersunk Screws) Standard: No. 10 (For Nos. 10, 12, and 1/4" Standard Screws, 1/4" Countersunk Screws, and Nos. 6 and 8 Nuts) 8" Long Socket Screwdiver Handle | Tri-Groove | No. 4, No. 6, No. 10 | 7393A41 | 000000 | ||
