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Tamper-Resistant Drilled Spanner Pan Head Screws
A tamper-resistant drilled spanner drive makes these screws difficult to remove without special tools. They're 18-8 stainless steel for good chemical resistance. They may be mildly magnetic. All are passivated for added protection against oxidation and corrosion. For installation tools, see drilled spanner drivers and bits. Length is measured from under the head.
For technical drawings and 3-D models, click on a part number.
| Lg. | Threading | Head Dia. | Head Ht. | Drive Size | Tensile Strength, psi  | Specifications Met | Pkg. Qty. | Pkg. | |
18-8 Stainless Steel | |||||||||
|---|---|---|---|---|---|---|---|---|---|
10-24 | |||||||||
| 3/8" | Fully Threaded | 0.373" | 0.110" | No. 10 | 80,000 | ASME B18.6.3 | 25 | 000000000 | 000000 |
| 1/2" | Fully Threaded | 0.373" | 0.110" | No. 10 | 80,000 | ASME B18.6.3 | 25 | 000000000 | 00000 |
| 3/4" | Fully Threaded | 0.373" | 0.110" | No. 10 | 80,000 | ASME B18.6.3 | 25 | 000000000 | 00000 |
| 1" | Fully Threaded | 0.373" | 0.110" | No. 10 | 80,000 | ASME B18.6.3 | 25 | 000000000 | 00000 |
| 1 1/2" | Fully Threaded | 0.373" | 0.110" | No. 10 | 80,000 | ASME B18.6.3 | 25 | 000000000 | 00000 |
| 2" | Fully Threaded | 0.373" | 0.110" | No. 10 | 80,000 | ASME B18.6.3 | 10 | 000000000 | 0000 |
10-32 | |||||||||
| 1/4" | Fully Threaded | 0.373" | 0.110" | No. 10 | 80,000 | __ | 25 | 000000000 | 00000 |
| 3/8" | Fully Threaded | 0.373" | 0.110" | No. 10 | 80,000 | ASME B18.6.3 | 25 | 000000000 | 00000 |
| 1/2" | Fully Threaded | 0.373" | 0.110" | No. 10 | 80,000 | ASME B18.6.3 | 25 | 000000000 | 00000 |
| 3/4" | Fully Threaded | 0.373" | 0.110" | No. 10 | 80,000 | ASME B18.6.3 | 25 | 000000000 | 00000 |
| 1" | Fully Threaded | 0.373" | 0.110" | No. 10 | 80,000 | ASME B18.6.3 | 25 | 000000000 | 00000 |
| 1 1/2" | Fully Threaded | 0.373" | 0.110" | No. 10 | 80,000 | ASME B18.6.3 | 25 | 000000000 | 00000 |
| 2" | Fully Threaded | 0.373" | 0.110" | No. 10 | 80,000 | ASME B18.6.3 | 10 | 000000000 | 0000 |
Metric Tamper-Resistant Drilled Spanner Pan Head Screws
These screws have a drilled spanner drive, making them difficult to remove without special tools. Made from 18-8 stainless steel, they have good chemical resistance and may be mildly magnetic. For installation tools, see drilled spanner drivers and bits. Length is measured from under the head.
Passivated stainless steel screws provide added protection against oxidation and corrosion.
For technical drawings and 3-D models, click on a part number.
| Lg., mm | Threading | Head Dia., mm | Head Ht., mm | Drive Size | Finish | Tensile Strength, psi | Pkg. Qty. | Pkg. | |
18-8 Stainless Steel | |||||||||
|---|---|---|---|---|---|---|---|---|---|
M5 × 0.8 mm | |||||||||
| 8 | Fully Threaded | 9.98 | 3.00 | No. 10 | Passivated | 80,000 | 25 | 000000000 | 000000 |
| 10 | Fully Threaded | 9.98 | 3.00 | No. 10 | Passivated | 80,000 | 25 | 000000000 | 00000 |
| 12 | Fully Threaded | 9.98 | 3.00 | No. 10 | Passivated | 80,000 | 25 | 000000000 | 00000 |
| 16 | Fully Threaded | 9.98 | 3.00 | No. 10 | Passivated | 80,000 | 25 | 000000000 | 00000 |
| 20 | Fully Threaded | 9.98 | 3.00 | No. 10 | Passivated | 80,000 | 25 | 000000000 | 00000 |
Extra-Wide Tamper-Resistant Drilled Spanner Truss Head Screws
An extra-wide truss head distributes holding pressure to reduce the likelihood of crushing thin materials. These screws have a drilled spanner drive that makes them difficult to remove without special tools. For installation tools, see drilled spanner drivers and bits. Screws are 18-8 stainless steel for good chemical resistance. They may be mildly magnetic. Length is measured from under the head.
Passivated stainless steel screws provide added protection against oxidation and corrosion.
For technical drawings and 3-D models, click on a part number.
| Lg. | Threading | Head Dia. | Head Ht. | Drive Size | Finish | Tensile Strength, psi | Specifications Met | Pkg. Qty. | Pkg. | |
18-8 Stainless Steel | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|
10-24 | ||||||||||
| 1/2" | Fully Threaded | 0.448" | 0.128" | No. 10 | __ | 70,000 | ASME B18.6.3 | 10 | 000000000 | 00000 |
| 3/4" | Fully Threaded | 0.448" | 0.128" | No. 10 | __ | 70,000 | ASME B18.6.3 | 10 | 000000000 | 0000 |
10-32 | ||||||||||
| 1/4" | Fully Threaded | 0.448" | 0.118" | No. 10 | Passivated | 70,000 | __ | 25 | 000000000 | 00000 |
| 3/8" | Fully Threaded | 0.448" | 0.118" | No. 10 | Passivated | 70,000 | __ | 25 | 000000000 | 00000 |
| 1/2" | Fully Threaded | 0.448" | 0.118" | No. 10 | Passivated | 70,000 | __ | 25 | 000000000 | 00000 |
| 3/4" | Fully Threaded | 0.448" | 0.128" | No. 10 | __ | 70,000 | ASME B18.6.3 | 10 | 000000000 | 0000 |
| 1" | Fully Threaded | 0.448" | 0.118" | No. 10 | Passivated | 70,000 | __ | 25 | 000000000 | 00000 |
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.
For technical drawings and 3-D models, click on a part number.
| Lg. | Threading | Min. Thread Lg. | Head Dia. | Head Ht. | Drive Size | Tensile Strength, psi | Pkg. Qty. | Pkg. | |
Zinc-Plated Steel | |||||||||
|---|---|---|---|---|---|---|---|---|---|
10-24 | |||||||||
| 1/2" | Fully Threaded | __ | 0.375" | 0.15" | No. 10 | 80,000 | 50 | 000000000 | 000000 |
| 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 |
Tamper-Resistant Drilled Spanner Flat Head Screws
These screws have a tamper-resistant drilled spanner drive, which makes them difficult to remove without special tools. For installation tools, see tamper-resistant drilled spanner drivers and bits. Made from 18-8 stainless steel, they have good chemical resistance and may be mildly magnetic. They’re angled under the head to sit flush within countersunk holes. Length is measured from the top of the head.
Passivated stainless steel screws provide added protection against oxidation and corrosion.
For technical drawings and 3-D models, click on a part number.
| Lg. | Threading | Min. Thread Lg. | Flat Head Profile | Head Dia. | Head Ht. | Drive Size | Finish | Tensile Strength, psi | Specifications Met | Pkg. Qty. | Pkg. | |
18-8 Stainless Steel | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
10-24 | ||||||||||||
| 3/8" | Fully Threaded | __ | Standard | 0.332" | 0.116" | No. 10 | Passivated | 70,000 | ASME B18.6.3 | 25 | 000000000 | 000000 |
| 1/2" | Fully Threaded | __ | Standard | 0.362" | 0.116" | No. 10 | Passivated | 70,000 | ASME B18.6.3 | 25 | 000000000 | 00000 |
| 5/8" | Fully Threaded | __ | Standard | 0.362" | 0.116" | No. 10 | Passivated | 70,000 | ASME B18.6.3 | 25 | 000000000 | 00000 |
| 3/4" | Fully Threaded | __ | Standard | 0.362" | 0.116" | No. 10 | Passivated | 70,000 | ASME B18.6.3 | 25 | 000000000 | 00000 |
| 1" | Fully Threaded | __ | Standard | 0.362" | 0.116" | No. 10 | Passivated | 70,000 | ASME B18.6.3 | 25 | 000000000 | 00000 |
| 1 1/4" | Fully Threaded | __ | Standard | 0.362" | 0.116" | No. 10 | Passivated | 70,000 | ASME B18.6.3 | 25 | 000000000 | 00000 |
| 1 1/2" | Fully Threaded | __ | Standard | 0.362" | 0.116" | No. 10 | Passivated | 70,000 | ASME B18.6.3 | 25 | 000000000 | 00000 |
| 2" | Fully Threaded | __ | Standard | 0.362" | 0.116" | No. 10 | Passivated | 70,000 | ASME B18.6.3 | 10 | 000000000 | 0000 |
10-32 | ||||||||||||
| 3/8" | Fully Threaded | __ | Standard | 0.385" | 0.116" | No. 10 | Passivated | 70,000 | ASME B18.6.3 | 25 | 000000000 | 00000 |
| 1/2" | Fully Threaded | __ | Standard | 0.362" | 0.116" | No. 10 | Passivated | 70,000 | ASME B18.6.3 | 25 | 000000000 | 00000 |
| 5/8" | Fully Threaded | __ | Standard | 0.385" | 0.116" | No. 10 | Passivated | 70,000 | ASME B18.6.3 | 25 | 000000000 | 00000 |
| 3/4" | Fully Threaded | __ | Standard | 0.362" | 0.116" | No. 10 | Passivated | 70,000 | ASME B18.6.3 | 25 | 000000000 | 00000 |
| 1" | Fully Threaded | __ | Standard | 0.362" | 0.116" | No. 10 | Passivated | 70,000 | ASME B18.6.3 | 25 | 000000000 | 00000 |
| 1 1/4" | Fully Threaded | __ | Standard | 0.362" | 0.116" | No. 10 | Passivated | 70,000 | ASME B18.6.3 | 25 | 000000000 | 00000 |
| 1 1/2" | Fully Threaded | __ | Standard | 0.362" | 0.116" | No. 10 | Passivated | 70,000 | ASME B18.6.3 | 25 | 000000000 | 00000 |
| 2" | Fully Threaded | __ | Standard | 0.362" | 0.116" | No. 10 | Passivated | 70,000 | ASME B18.6.3 | 10 | 000000000 | 0000 |
| 2 1/2" | Partially Threaded | 1 1/2" | Standard | 0.362" | 0.116" | No. 10 | Passivated | 70,000 | ASME B18.6.3 | 10 | 000000000 | 0000 |
Metric Tamper-Resistant Drilled Spanner Flat Head Screws
These screws have a tamper-resistant drilled spanner drive, which makes them difficult to remove without special tools. For installation tools, see tamper-resistant drilled spanner drivers and bits. Made from 18-8 stainless steel, they have good chemical resistance and may be mildly magnetic. All are passivated for added protection against oxidation and corrosion. They’re angled under the head to sit flush within countersunk holes. Length is measured from the top of the head.
For technical drawings and 3-D models, click on a part number.
| Lg., mm | Threading | Head Dia., mm | Head Ht., mm | Drive Size | Tensile Strength, psi | Pkg. Qty. | Pkg. | |
18-8 Stainless Steel | ||||||||
|---|---|---|---|---|---|---|---|---|
M5 × 0.8 mm | ||||||||
| 8 | Fully Threaded | 9.19 | 2.50 | No. 10 | 80,000 | 25 | 000000000 | 000000 |
| 10 | Fully Threaded | 9.19 | 2.50 | No. 10 | 80,000 | 25 | 000000000 | 00000 |
| 12 | Fully Threaded | 9.19 | 2.50 | No. 10 | 80,000 | 25 | 000000000 | 00000 |
| 16 | Fully Threaded | 9.19 | 2.50 | No. 10 | 80,000 | 25 | 000000000 | 00000 |
| 20 | Fully Threaded | 9.19 | 2.50 | No. 10 | 80,000 | 25 | 000000000 | 00000 |
Drilled Spanner Rounded Head Screws for Sheet Metal
Install and remove these screws with a tamper-resistant spanner driver. Made from 18-8 stainless steel, they are chemical resistant and may be mildly magnetic. They penetrate 0.025" and thinner sheet metal. Length is measured from under the head.
For technical drawings and 3-D models, click on a part number.
Head | ||||||||
|---|---|---|---|---|---|---|---|---|
| Lg. | Dia. | Ht. | Drive Size | Drill Bit Size | Approximate Threads per Inch | Pkg. Qty. | Pkg. | |
18-8 Stainless Steel | ||||||||
No. 10 | ||||||||
| 1/2" | 0.373" | 0.11" | No. 10 | No. 21 | 12 | 25 | 000000000 | 00000 |
| 3/4" | 0.373" | 0.11" | No. 10 | No. 21 | 12 | 25 | 000000000 | 0000 |
| 1" | 0.373" | 0.11" | No. 10 | No. 21 | 12 | 25 | 000000000 | 0000 |
| 1 1/4" | 0.373" | 0.11" | No. 10 | No. 21 | 12 | 25 | 000000000 | 00000 |
| 1 1/2" | 0.373" | 0.11" | No. 10 | No. 21 | 12 | 25 | 000000000 | 00000 |
| 2" | 0.373" | 0.11" | No. 10 | No. 21 | 12 | 10 | 000000000 | 0000 |
Drilled Spanner Flat Head Screws for Sheet Metal
Install and remove these screws with a tamper-resistant spanner driver. They're beveled under the head for a flush finish in countersunk holes. Made from 18-8 stainless steel, these screws are chemical resistant and may be mildly magnetic. They penetrate 0.025" and thinner sheet metal. Length is measured from the top of the head.
For technical drawings and 3-D models, click on a part number.
Head | ||||||||
|---|---|---|---|---|---|---|---|---|
| Lg. | Dia. | Ht. | Drive Size | Drill Bit Size | Approximate Threads per Inch | Pkg. Qty. | Pkg. | |
18-8 Stainless Steel | ||||||||
No. 10 | ||||||||
| 1/2" | 0.385" | 0.116" | No. 10 | No. 21 | 12 | 25 | 000000000 | 00000 |
| 3/4" | 0.385" | 0.116" | No. 10 | No. 21 | 12 | 25 | 000000000 | 00000 |
| 1" | 0.385" | 0.116" | No. 10 | No. 21 | 12 | 25 | 000000000 | 00000 |
| 1 1/2" | 0.385" | 0.116" | No. 10 | No. 21 | 12 | 25 | 000000000 | 00000 |
| 2" | 0.385" | 0.116" | No. 10 | No. 21 | 12 | 25 | 000000000 | 00000 |