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About Rounded Head Screws
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Tamper-Resistant Tri-Groove Rounded Head Screws
Difficult to remove without special tools, these screws have three grooves. For installation tools, see Tri-Groove bits and drivers. Screws are zinc plated for corrosion resistance in wet environments. Length is measured from under the head.
| Lg. | Threading | Min. Thread Lg. | Head Dia. | Head Ht. | Drive Size | Tensile Strength, psi  | Pkg. Qty. | Pkg. | |
Zinc-Plated Steel | |||||||||
|---|---|---|---|---|---|---|---|---|---|
6-32 | |||||||||
| 3/8" | Fully Threaded | __ | 0.26" | 0.12" | No. 6 | 80,000 | 50 | 000000000 | 000000 |
| 1/2" | Fully Threaded | __ | 0.26" | 0.12" | No. 6 | 80,000 | 50 | 000000000 | 00000 |
| 3/4" | Fully Threaded | __ | 0.26" | 0.12" | No. 6 | 80,000 | 50 | 000000000 | 00000 |
8-32 | |||||||||
| 3/8" | Fully Threaded | __ | 0.28" | 0.148" | No. 6 | 80,000 | 50 | 000000000 | 00000 |
| 1/2" | Fully Threaded | __ | 0.28" | 0.148" | No. 6 | 80,000 | 50 | 000000000 | 00000 |
| 3/4" | Fully Threaded | __ | 0.28" | 0.148" | No. 6 | 80,000 | 50 | 000000000 | 00000 |
| 1" | Fully Threaded | __ | 0.28" | 0.148" | No. 6 | 80,000 | 50 | 000000000 | 00000 |
| 1 1/4" | Fully Threaded | __ | 0.28" | 0.148" | No. 6 | 80,000 | 50 | 000000000 | 00000 |
| 1 1/2" | Fully Threaded | __ | 0.28" | 0.148" | No. 6 | 80,000 | 50 | 000000000 | 00000 |
10-24 | |||||||||
| 1/2" | Fully Threaded | __ | 0.375" | 0.15" | No. 10 | 80,000 | 50 | 000000000 | 00000 |
| 3/4" | Fully Threaded | __ | 0.375" | 0.15" | No. 10 | 80,000 | 50 | 000000000 | 00000 |
| 1" | Fully Threaded | __ | 0.375" | 0.15" | No. 10 | 80,000 | 25 | 000000000 | 0000 |
| 1 1/2" | Fully Threaded | __ | 0.375" | 0.15" | No. 10 | 80,000 | 25 | 000000000 | 0000 |
10-32 | |||||||||
| 1/2" | Fully Threaded | __ | 0.375" | 0.15" | No. 10 | 80,000 | 50 | 000000000 | 00000 |
| 3/4" | Fully Threaded | __ | 0.375" | 0.15" | No. 10 | 80,000 | 50 | 000000000 | 00000 |
| 1" | Fully Threaded | __ | 0.375" | 0.15" | No. 10 | 80,000 | 50 | 000000000 | 00000 |
| 1 1/2" | Fully Threaded | __ | 0.375" | 0.15" | No. 10 | 80,000 | 25 | 000000000 | 0000 |
1/4"-20 | |||||||||
| 1/2" | Fully Threaded | __ | 0.375" | 0.155" | No. 10 | 80,000 | 50 | 000000000 | 00000 |
| 3/4" | Fully Threaded | __ | 0.375" | 0.155" | No. 10 | 80,000 | 50 | 000000000 | 00000 |
| 1" | Fully Threaded | __ | 0.375" | 0.155" | No. 10 | 80,000 | 25 | 000000000 | 0000 |
| 1 1/2" | Fully Threaded | __ | 0.375" | 0.155" | No. 10 | 80,000 | 25 | 000000000 | 0000 |
| 2" | Fully Threaded | __ | 0.375" | 0.155" | No. 10 | 80,000 | 25 | 000000000 | 00000 |
| 2 1/2" | Partially Threaded | 1 1/2" | 0.375" | 0.155" | No. 10 | 80,000 | 10 | 000000000 | 0000 |
5/16"-18 | |||||||||
| 5/8" | Fully Threaded | __ | 0.57" | 0.275" | No. 20 | 80,000 | 25 | 000000000 | 00000 |
| 3/4" | Fully Threaded | __ | 0.57" | 0.275" | No. 20 | 80,000 | 25 | 000000000 | 00000 |
| 1" | Fully Threaded | __ | 0.57" | 0.275" | No. 20 | 80,000 | 25 | 000000000 | 00000 |
Tri-Groove Bits
Grip the indentations on the head of tri-groove fasteners. These bits have a groove in the shank to fit directly into power tools without an adapter.
Overall | |||||
|---|---|---|---|---|---|
| For Screw Size | Lg. | Dia. | Material | Each | |
1/4" Hex Shank Size for Power Tools | |||||
| No. 1, No. 2, No. 3, No. 4 | 1 3/8" | 3/8" | Steel | 0000000 | 000000 |
| No. 5, No. 6, No. 7, No. 8, No. 9, No. 10, No. 11 | 1 1/4" | 1/2" | Steel | 0000000 | 00000 |
| No. 8, No. 9, No. 10, No. 11, No. 12, 1/4" | 1 1/4" | 7/8" | Steel | 0000000 | 00000 |
| No. 12, 5/16" | 1 1/4" | 3/4" | Steel | 0000000 | 00000 |
Tri-Groove Bit Sets
Grip the indentations on the head of tri-groove fasteners. These bits have a groove in the shank and fit directly into power tools without an adapter.
| Components Included | Bits Included | Material | Bit Material | Container Type | Each | |
1/4" Hex Shank Size for Power Tools | ||||||
|---|---|---|---|---|---|---|
| 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.) | Steel | High-Speed Steel | Plastic Pouch | 0000000 | 000000 |