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Steel Torx Flat Head Thread-Cutting Screws
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Keep drivers from slipping as you cut threads and secure components with countersunk holes. These Torx screws have a six-lobe recess that’s also known as a star drive. Because they remove material, they take less effort to install and put less stress on your workpiece than thread-forming screws. Their flat, beveled head sits flush in holes.
Length is measured from the top of the head.
Zinc-Plated Steel—A common choice for areas with occasional exposure to moisture.
Black Phosphate-Coated Steel—More corrosion resistant than black-oxide steel, these screws are suitable for environments with some moisture. They have a dark, matte coating for a finished look.
Head | ||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Lg. | Dia. | Ht. | Tapping Screw Type | Drive Size | Approx. Threads per In. | Countersink Angle | Flat Head Profile | Drill Bit Size | Shank Cross Section | Pkg. Qty. | Pkg. | |||
Zinc-Plated Steel | ||||||||||||||
No. 6 Screw Size | ||||||||||||||
| 3/8" | 0.262" | 0.083" | F | T10 | 32 | 82° | Standard | 31 Ga. | Round | 50 | 90390A136 | 000000 | ||
| 1/2" | 0.262" | 0.083" | F | T10 | 32 | 82° | Standard | 31 Ga. | Round | 50 | 90390A137 | 00000 | ||
| 3/4" | 0.262" | 0.083" | F | T10 | 32 | 82° | Standard | 31 Ga. | Round | 100 | 90390A138 | 00000 | ||
No. 8 Screw Size | ||||||||||||||
| 1/2" | 0.312" | 0.1" | F | T15 | 32 | 82° | Standard | 26 Ga. | Round | 100 | 90390A139 | 00000 | ||
| 3/4" | 0.312" | 0.1" | F | T15 | 32 | 82° | Standard | 26 Ga. | Round | 50 | 90390A141 | 00000 | ||
No. 10 Screw Size | ||||||||||||||
| 5/8" | 0.362" | 0.116" | F | T20 | 24 | 82° | Standard | 17 Ga. | Round | 50 | 90390A142 | 00000 | ||
| 3/4" | 0.362" | 0.116" | F | T20 | 24 | 82° | Standard | 17 Ga. | Round | 50 | 90390A143 | 00000 | ||
| 1" | 0.362" | 0.116" | F | T20 | 24 | 82° | Standard | 17 Ga. | Round | 25 | 90390A144 | 00000 | ||
No. 12 Screw Size | ||||||||||||||
| 1" | 0.412" | 0.132" | F | T25 | 24 | 82° | Standard | 8 Ga. | Round | 25 | 90390A145 | 00000 | ||
1/4" Screw Size | ||||||||||||||
| 1/2" | 0.477" | 0.153" | F | T27 | 20 | 82° | Standard | 1 Ga. | Round | 25 | 90390A146 | 00000 | ||
| 5/8" | 0.477" | 0.153" | F | T27 | 20 | 82° | Standard | 1 Ga. | Round | 25 | 90390A147 | 00000 | ||
| 3/4" | 0.477" | 0.153" | F | T27 | 20 | 82° | Standard | 1 Ga. | Round | 25 | 90390A148 | 00000 | ||
| 1" | 0.477" | 0.153" | F | T27 | 20 | 82° | Standard | 1 Ga. | Round | 25 | 90390A149 | 00000 | ||
| 1 1/4" | 0.477" | 0.153" | F | T27 | 20 | 82° | Standard | 1 Ga. | Round | 25 | 90390A151 | 00000 | ||
| 1 1/2" | 0.477" | 0.153" | F | T27 | 20 | 82° | Standard | 1 Ga. | Round | 25 | 90390A152 | 00000 | ||
Black Phosphate-Coated Steel | ||||||||||||||
No. 10 Screw Size | ||||||||||||||
| 1 1/4" | 0.362" | 0.116" | F | T20 | 24 | 82° | Standard | 17 Ga. | Round | 50 | 90390A111 | 00000 | ||
1/4" Screw Size | ||||||||||||||
| 1/2" | 0.477" | 0.153" | F | T30 | 20 | 82° | Standard | 1 Ga. | Round | 25 | 90390A112 | 00000 | ||
| 3/4" | 0.477" | 0.153" | F | T30 | 20 | 82° | Standard | 1 Ga. | Round | 25 | 90390A113 | 00000 | ||
| 1" | 0.477" | 0.153" | F | T30 | 20 | 82° | Standard | 1 Ga. | Round | 100 | 90390A535 | 00000 | ||
| 1 1/4" | 0.477" | 0.153" | F | T30 | 20 | 82° | Standard | 1 Ga. | Round | 100 | 90390A540 | 00000 | ||
| 1 1/2" | 0.477" | 0.153" | F | T30 | 20 | 82° | Standard | 1 Ga. | Round | 50 | 90390A545 | 00000 | ||
| 1 3/4" | 0.477" | 0.153" | F | T30 | 20 | 82° | Standard | 1 Ga. | Round | 50 | 90390A114 | 00000 | ||
| 2" | 0.477" | 0.153" | F | T30 | 20 | 82° | Standard | 1 Ga. | Round | 50 | 90390A550 | 00000 | ||
| 2 1/4" | 0.477" | 0.153" | F | T30 | 20 | 82° | Standard | 1 Ga. | Round | 50 | 90390A551 | 00000 | ||
| 2 1/2" | 0.477" | 0.153" | F | T30 | 20 | 82° | Standard | 1 Ga. | Round | 50 | 90390A552 | 00000 | ||
| 2 3/4" | 0.477" | 0.153" | F | T30 | 20 | 82° | Standard | 1 Ga. | Round | 25 | 90390A115 | 00000 | ||
| 3" | 0.477" | 0.153" | F | T30 | 20 | 82° | Standard | 1 Ga. | Round | 25 | 90390A554 | 00000 | ||
| 3 1/2" | 0.477" | 0.153" | F | T30 | 20 | 82° | Standard | 1 Ga. | Round | 25 | 90390A555 | 00000 | ||
| 4" | 0.477" | 0.153" | F | T30 | 20 | 82° | Standard | 1 Ga. | Round | 25 | 90390A556 | 00000 | ||
| 4 1/2" | 0.477" | 0.153" | F | T30 | 20 | 82° | Standard | 1 Ga. | Round | 1 | 90390A116 | 0000 | ||
| 5" | 0.477" | 0.153" | F | T30 | 20 | 82° | Standard | 1 Ga. | Round | 1 | 90390A117 | 0000 | ||
| 6" | 0.477" | 0.153" | F | T30 | 20 | 82° | Standard | 1 Ga. | Round | 1 | 90390A118 | 0000 | ||
5/16" Screw Size | ||||||||||||||
| 3/4" | 0.597" | 0.191" | F | T40 | 18 | 82° | Standard | L | Round | 10 | 90390A119 | 00000 | ||
| 1" | 0.597" | 0.191" | F | T40 | 18 | 82° | Standard | L | Round | 50 | 90390A121 | 00000 | ||
| 1 1/4" | 0.597" | 0.191" | F | T40 | 18 | 82° | Standard | L | Round | 50 | 90390A122 | 00000 | ||
| 1 1/2" | 0.597" | 0.191" | F | T40 | 18 | 82° | Standard | L | Round | 50 | 90390A123 | 00000 | ||
| 1 3/4" | 0.597" | 0.191" | F | T40 | 18 | 82° | Standard | L | Round | 50 | 90390A124 | 00000 | ||
| 2" | 0.597" | 0.191" | F | T40 | 18 | 82° | Standard | L | Round | 50 | 90390A591 | 00000 | ||
| 2 1/4" | 0.597" | 0.191" | F | T40 | 18 | 82° | Standard | L | Round | 25 | 90390A592 | 00000 | ||
| 2 1/2" | 0.597" | 0.191" | F | T40 | 18 | 82° | Standard | L | Round | 25 | 90390A593 | 00000 | ||
| 3" | 0.597" | 0.191" | F | T40 | 18 | 82° | Standard | L | Round | 25 | 90390A595 | 00000 | ||
| 3 1/2" | 0.597" | 0.191" | F | T40 | 18 | 82° | Standard | L | Round | 5 | 90390A125 | 00000 | ||
| 4" | 0.597" | 0.191" | F | T40 | 18 | 82° | Standard | L | Round | 1 | 90390A126 | 0000 | ||
| 5" | 0.597" | 0.191" | F | T40 | 18 | 82° | Standard | L | Round | 1 | 90390A127 | 0000 | ||
| 6" | 0.597" | 0.191" | F | T40 | 18 | 82° | Standard | L | Round | 1 | 90390A128 | 0000 | ||
3/8" Screw Size | ||||||||||||||
| 1" | 0.717" | 0.23" | F | T40 | 16 | 82° | Standard | T | Round | 5 | 90390A129 | 00000 | ||
| 1 1/4" | 0.717" | 0.23" | F | T40 | 16 | 82° | Standard | T | Round | 5 | 90390A131 | 00000 | ||
| 1 1/2" | 0.717" | 0.23" | F | T40 | 16 | 82° | Standard | T | Round | 10 | 90390A132 | 00000 | ||
| 2" | 0.717" | 0.23" | F | T40 | 16 | 82° | Standard | T | Round | 25 | 90390A133 | 00000 | ||
| 2 1/2" | 0.717" | 0.23" | F | T40 | 16 | 82° | Standard | T | Round | 1 | 90390A134 | 0000 | ||
| 3" | 0.717" | 0.23" | F | T40 | 16 | 82° | Standard | T | Round | 1 | 90390A135 | 0000 | ||
Steel Torx Flat Head Screws for Wood and Composite Wood
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The thin head reduces surface damage and leaves a smooth, near-invisible finish on decking and trim. These screws are also known as trim head screws. With a deep six-lobe opening, their Torx drive handles more torque than slotted, Phillips, and hex drives. The flat head creates a discreet look in countersunk holes and deters snags.
Drill a pilot hole slightly smaller than the screw to prevent splitting. Length is measured from the top of the head.
Green Corrosion-Resistant-Coated Steel—The dark-green coating resists rust at the level of stainless steel. All of these screws have passed a 1,500-hour salt spray test.
Head | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
Lg. | Dia. | Ht. | Drill Bit Size | Flat Head Profile | Approx. Threads per In. | Threading | Tapping Method | Pkg. Qty. | Pkg. | |||
Green Corrosion-Resistant-Coated Steel | ||||||||||||
No. 8 | ||||||||||||
| 2" | 0.323" | 0.125" | 5/32" | Narrow | 10 | Partially Threaded | Thread Cutting | 50 | 91520A323 | 000000 | ||
No. 9 | ||||||||||||
| 2 1/2" | 0.343" | 0.125" | 5/32" | Narrow | 9 | Partially Threaded | Thread Cutting | 50 | 91520A325 | 00000 | ||
| 3" | 0.343" | 0.125" | 5/32" | Narrow | 9 | Partially Threaded | Thread Cutting | 25 | 91520A326 | 00000 | ||
No. 10 | ||||||||||||
| 3 1/2" | 0.354" | 0.125" | 5/32" | Narrow | 8 | Partially Threaded | Thread Cutting | 25 | 91520A327 | 00000 | ||
Distortion-Free Screws for Composite Wood
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Head | |||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Lg. | Dia. | Ht. | Drill Bit Size | Rounded Head Profile | Approx. Threads per In. | Threading | Tapping Method | Tapping Screw Type | Pkg. Qty. | Pkg. | |||
18-8 Stainless Steel | |||||||||||||
No. 10 | |||||||||||||
| 2 1/2" | 0.317" | 0.087" | 3/32" | Narrow | 9 | Fully Threaded | Thread Cutting | 17 | 25 | 98419A330 | 000000 | ||
| 2 3/4" | 0.266" | 0.11" | 3/32" | Narrow | 13 | Fully Threaded | Thread Cutting | 17 | 25 | 98419A440 | 00000 | ||
