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18-8 Stainless Steel Socket Head Screws
Fully Threaded
Partially Threaded
Made from 18-8 stainless steel, these screws have good chemical resistance and may be mildly magnetic. Length is measured from under the head.Silver-plated stainless steel screws have mild lubricity so they thread smoothly.
Coarse threads are the industry standard; choose these screws if you don’t know the pitch or threads per inch. Fine threads are closely spaced to prevent loosening from vibration. They are not compatible with coarse threads.
Screws that meet ASME B1.1, ASME B18.3, ISO 21269, and ISO 4762 (formerly DIN 912) comply with standards for dimensions. Screws that meet ASTM B456 and ASTM F837 comply with standards for materials.
For technical drawings and 3-D models, click on a part number.
Head | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| Lg. | Threading | Thread Spacing  | Dia. | Ht. | Drive Size | Tensile Strength, psi | Specifications Met | Pkg. Qty. | Pkg. | |
2-56 | ||||||||||
Silver-Plated 18-8 Stainless Steel | ||||||||||
| 1/8" | Fully Threaded | Coarse | 9/64" | 0.086" | 5/64" | 70,000 | ASME B18.3, ASTM F837 | 5 | 000000000 | 00000 |
| 3/16" | Fully Threaded | Coarse | 9/64" | 0.086" | 5/64" | 70,000 | ASME B18.3, ASTM F837 | 5 | 000000000 | 0000 |
| 1/4" | Fully Threaded | Coarse | 9/64" | 0.086" | 5/64" | 70,000 | ASME B18.3, ASTM F837 | 5 | 000000000 | 0000 |
| 3/8" | Fully Threaded | Coarse | 9/64" | 0.086" | 5/64" | 70,000 | ASME B18.3, ASTM F837 | 5 | 000000000 | 0000 |
| 1/2" | Fully Threaded | Coarse | 9/64" | 0.086" | 5/64" | 70,000 | ASME B18.3, ASTM F837 | 5 | 000000000 | 0000 |
Head | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| Lg. | Threading | Thread Spacing | Dia. | Ht. | Drive Size | Tensile Strength, psi | Specifications Met | Pkg. Qty. | Pkg. | |
4-40 | ||||||||||
Silver-Plated 18-8 Stainless Steel | ||||||||||
| 1/4" | Fully Threaded | Coarse | 0.183" | 0.112" | 3/32" | 70,000 | ASME B18.3, ASTM F837 | 5 | 000000000 | 00000 |
| 3/8" | Fully Threaded | Coarse | 0.183" | 0.112" | 3/32" | 70,000 | ASME B18.3, ASTM F837 | 5 | 000000000 | 0000 |
| 1/2" | Fully Threaded | Coarse | 0.183" | 0.112" | 3/32" | 70,000 | ASME B18.3, ASTM F837 | 5 | 000000000 | 0000 |
| 5/8" | Fully Threaded | Coarse | 0.183" | 0.112" | 3/32" | 70,000 | ASME B18.3, ASTM F837 | 5 | 000000000 | 00000 |
| 3/4" | Fully Threaded | Coarse | 0.183" | 0.112" | 3/32" | 70,000 | ASME B18.3, ASTM F837 | 5 | 000000000 | 0000 |
Head | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| Lg. | Threading | Min. Thread Lg. | Thread Spacing | Dia. | Ht. | Drive Size | Tensile Strength, psi | Specifications Met | Pkg. Qty. | Pkg. | |
6-32 | |||||||||||
Silver-Plated 18-8 Stainless Steel | |||||||||||
| 1/4" | Fully Threaded | __ | Coarse | 0.226" | 0.138" | 7/64" | 70,000 | ASME B18.3, ASTM F837 | 5 | 000000000 | 00000 |
| 3/8" | Fully Threaded | __ | Coarse | 0.226" | 0.138" | 7/64" | 70,000 | ASME B18.3, ASTM F837 | 5 | 000000000 | 0000 |
| 1/2" | Fully Threaded | __ | Coarse | 0.226" | 0.138" | 7/64" | 70,000 | ASME B18.3, ASTM F837 | 5 | 000000000 | 0000 |
| 5/8" | Fully Threaded | __ | Coarse | 0.226" | 0.138" | 7/64" | 70,000 | ASME B18.3, ASTM F837 | 5 | 000000000 | 0000 |
| 3/4" | Fully Threaded | __ | Coarse | 0.226" | 0.138" | 7/64" | 70,000 | ASME B18.3, ASTM F837 | 5 | 000000000 | 0000 |
| 1" | Partially Threaded | 3/4" | Coarse | 0.226" | 0.138" | 7/64" | 70,000 | ASME B18.3, ASTM F837 | 5 | 000000000 | 0000 |
Head | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| Lg. | Threading | Min. Thread Lg. | Thread Spacing | Dia. | Ht. | Drive Size | Tensile Strength, psi | Specifications Met | Pkg. Qty. | Pkg. | |
8-32 | |||||||||||
Silver-Plated 18-8 Stainless Steel | |||||||||||
| 3/8" | Fully Threaded | __ | Coarse | 0.27" | 0.164" | 9/64" | 70,000 | ASME B18.3, ASTM F837 | 5 | 000000000 | 00000 |
| 1/2" | Fully Threaded | __ | Coarse | 0.27" | 0.164" | 9/64" | 70,000 | ASME B18.3, ASTM F837 | 5 | 000000000 | 0000 |
| 5/8" | Fully Threaded | __ | Coarse | 0.27" | 0.164" | 9/64" | 70,000 | ASME B18.3, ASTM F837 | 5 | 000000000 | 0000 |
| 3/4" | Fully Threaded | __ | Coarse | 0.27" | 0.164" | 9/64" | 70,000 | ASME B18.3, ASTM F837 | 5 | 000000000 | 0000 |
| 1" | Partially Threaded | 3/4" | Coarse | 0.27" | 0.164" | 9/64" | 70,000 | ASME B18.3, ASTM F837 | 5 | 000000000 | 00000 |
Head | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| Lg. | Threading | Min. Thread Lg. | Thread Spacing | Dia. | Ht. | Drive Size | Tensile Strength, psi | Specifications Met | Pkg. Qty. | Pkg. | |
10-24 | |||||||||||
Silver-Plated 18-8 Stainless Steel | |||||||||||
| 1/2" | Fully Threaded | __ | Coarse | 5/16" | 0.19" | 5/32" | 70,000 | ASME B18.3, ASTM F837 | 5 | 000000000 | 00000 |
| 3/4" | Fully Threaded | __ | Coarse | 5/16" | 0.19" | 5/32" | 70,000 | ASME B18.3, ASTM F837 | 5 | 000000000 | 0000 |
| 1" | Partially Threaded | 7/8" | Coarse | 5/16" | 0.19" | 5/32" | 70,000 | ASME B18.3, ASTM F837 | 5 | 000000000 | 00000 |
Head | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| Lg. | Threading | Min. Thread Lg. | Thread Spacing | Dia. | Ht. | Drive Size | Tensile Strength, psi | Specifications Met | Pkg. Qty. | Pkg. | |
10-32 | |||||||||||
Silver-Plated 18-8 Stainless Steel | |||||||||||
| 3/8" | Fully Threaded | __ | Fine | 5/16" | 0.19" | 5/32" | 70,000 | ASME B18.3, ASTM F837 | 5 | 000000000 | 00000 |
| 1/2" | Fully Threaded | __ | Fine | 5/16" | 0.19" | 5/32" | 70,000 | ASME B18.3, ASTM F837 | 5 | 000000000 | 0000 |
| 5/8" | Fully Threaded | __ | Fine | 5/16" | 0.19" | 5/32" | 70,000 | ASME B18.3, ASTM F837 | 5 | 000000000 | 0000 |
| 3/4" | Fully Threaded | __ | Fine | 5/16" | 0.19" | 5/32" | 70,000 | ASME B18.3, ASTM F837 | 5 | 000000000 | 0000 |
| 1" | Partially Threaded | 7/8" | Fine | 5/16" | 0.19" | 5/32" | 70,000 | ASME B18.3, ASTM F837 | 5 | 000000000 | 00000 |
Head | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| Lg. | Threading | Min. Thread Lg. | Thread Spacing | Dia. | Ht. | Drive Size | Tensile Strength, psi | Specifications Met | Pkg. Qty. | Pkg. | |
1/4"-20 | |||||||||||
Silver-Plated 18-8 Stainless Steel | |||||||||||
| 1/2" | Fully Threaded | __ | Coarse | 3/8" | 1/4" | 3/16" | 70,000 | ASME B18.3, ASTM F837 | 5 | 000000000 | 00000 |
| 5/8" | Fully Threaded | __ | Coarse | 3/8" | 1/4" | 3/16" | 70,000 | ASME B18.3, ASTM F837 | 5 | 000000000 | 00000 |
| 3/4" | Fully Threaded | __ | Coarse | 3/8" | 1/4" | 3/16" | 70,000 | ASME B18.3, ASTM F837 | 5 | 000000000 | 00000 |
| 1" | Fully Threaded | __ | Coarse | 3/8" | 1/4" | 3/16" | 70,000 | ASME B18.3, ASTM F837 | 5 | 000000000 | 00000 |
| 1 1/4" | Partially Threaded | 1" | Coarse | 3/8" | 1/4" | 3/16" | 70,000 | ASME B18.3, ASTM F837 | 5 | 000000000 | 00000 |
| 1 1/2" | Partially Threaded | 1" | Coarse | 3/8" | 1/4" | 3/16" | 70,000 | ASME B18.3, ASTM F837 | 5 | 000000000 | 00000 |
Cleaned and Bagged 18-8 Stainless Steel Socket Head Screws for High Vacuum
Cleaned and double bagged in an ISO Class 5 (Fed. Std. Class 100) clean room, these screws are ready to use on chambers and components in high-vacuum systems. 18-8 stainless steel releases gas at a slower rate than other metals, allowing your system to achieve higher levels of vacuum. Screws are silver plated for lubricity, reducing wear over time. Length is measured from under the head.
For technical drawings and 3-D models, click on a part number.
Head | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| Lg. | Threading | Thread Spacing | Dia. | Ht. | Drive Size | Tensile Strength, psi | Environmental Rating | Specifications Met | Each | |
Silver-Plated 18-8 Stainless Steel | ||||||||||
4-40 | ||||||||||
| 1/2" | Fully Threaded | Coarse | 0.183" | 0.112" | 3/32" | 70,000 | Fed. Std. Class 100, ISO Class 5 | __ | 000000000 | 000000 |
| 3/4" | Fully Threaded | Coarse | 0.183" | 0.112" | 3/32" | 70,000 | Fed. Std. Class 100, ISO Class 5 | __ | 000000000 | 00000 |
| 1" | Fully Threaded | Coarse | 0.183" | 0.112" | 3/32" | 70,000 | Fed. Std. Class 100, ISO Class 5 | __ | 000000000 | 00000 |
6-32 | ||||||||||
| 1/2" | Fully Threaded | Coarse | 0.226" | 0.138" | 7/64" | 70,000 | Fed. Std. Class 100, ISO Class 5 | __ | 000000000 | 00000 |
| 3/4" | Fully Threaded | Coarse | 0.226" | 0.138" | 7/64" | 70,000 | Fed. Std. Class 100, ISO Class 5 | __ | 000000000 | 00000 |
| 1" | Fully Threaded | Coarse | 0.226" | 0.138" | 7/64" | 70,000 | Fed. Std. Class 100, ISO Class 5 | __ | 000000000 | 00000 |
8-32 | ||||||||||
| 1/2" | Fully Threaded | Coarse | 0.27" | 0.164" | 9/64" | 70,000 | Fed. Std. Class 100, ISO Class 5 | __ | 000000000 | 00000 |
| 3/4" | Fully Threaded | Coarse | 0.27" | 0.164" | 9/64" | 70,000 | Fed. Std. Class 100, ISO Class 5 | __ | 000000000 | 00000 |
| 1" | Fully Threaded | Coarse | 0.27" | 0.164" | 9/64" | 70,000 | Fed. Std. Class 100, ISO Class 5 | __ | 000000000 | 00000 |
10-32 | ||||||||||
| 1/2" | Fully Threaded | Fine | 5/16" | 0.19" | 5/32" | 70,000 | Fed. Std. Class 100, ISO Class 5 | __ | 000000000 | 00000 |
| 3/4" | Fully Threaded | Fine | 5/16" | 0.19" | 5/32" | 70,000 | Fed. Std. Class 100, ISO Class 5 | __ | 000000000 | 00000 |
| 1" | Fully Threaded | Fine | 5/16" | 0.19" | 5/32" | 70,000 | Fed. Std. Class 100, ISO Class 5 | __ | 000000000 | 00000 |
1/4"-20 | ||||||||||
| 1/2" | Fully Threaded | Coarse | 3/8" | 1/4" | 3/16" | 70,000 | Fed. Std. Class 100, ISO Class 5 | __ | 000000000 | 00000 |
| 3/4" | Fully Threaded | Coarse | 3/8" | 1/4" | 3/16" | 70,000 | Fed. Std. Class 100, ISO Class 5 | __ | 000000000 | 00000 |
| 1" | Fully Threaded | Coarse | 3/8" | 1/4" | 3/16" | 70,000 | Fed. Std. Class 100, ISO Class 5 | __ | 000000000 | 00000 |
M3 × 0.5 mm | ||||||||||
| 8mm | Fully Threaded | Coarse | 5.5mm | 3mm | 2.5 mm | 70,000 | Fed. Std. Class 100, ISO Class 5 | DIN 912, ISO 4762 | 000000000 | 00000 |
| 10mm | Fully Threaded | Coarse | 5.5mm | 3mm | 2.5 mm | 70,000 | Fed. Std. Class 100, ISO Class 5 | DIN 912, ISO 4762 | 000000000 | 00000 |
| 12mm | Fully Threaded | Coarse | 5.5mm | 3mm | 2.5 mm | 70,000 | Fed. Std. Class 100, ISO Class 5 | DIN 912, ISO 4762 | 000000000 | 00000 |
M4 × 0.7 mm | ||||||||||
| 8mm | Fully Threaded | Coarse | 7mm | 4mm | 3 mm | 70,000 | Fed. Std. Class 100, ISO Class 5 | DIN 912, ISO 4762 | 000000000 | 00000 |
| 10mm | Fully Threaded | Coarse | 7mm | 4mm | 3 mm | 70,000 | Fed. Std. Class 100, ISO Class 5 | DIN 912, ISO 4762 | 000000000 | 00000 |
| 12mm | Fully Threaded | Coarse | 7mm | 4mm | 3 mm | 70,000 | Fed. Std. Class 100, ISO Class 5 | DIN 912, ISO 4762 | 000000000 | 00000 |
M5 × 0.8 mm | ||||||||||
| 8mm | Fully Threaded | Coarse | 8.5mm | 5mm | 4 mm | 70,000 | Fed. Std. Class 100, ISO Class 5 | DIN 912, ISO 4762 | 000000000 | 00000 |
| 10mm | Fully Threaded | Coarse | 8.5mm | 5mm | 4 mm | 70,000 | Fed. Std. Class 100, ISO Class 5 | DIN 912, ISO 4762 | 000000000 | 00000 |
| 12mm | Fully Threaded | Coarse | 8.5mm | 5mm | 4 mm | 70,000 | Fed. Std. Class 100, ISO Class 5 | DIN 912, ISO 4762 | 000000000 | 00000 |
M6 × 1 mm | ||||||||||
| 8mm | Fully Threaded | Coarse | 10mm | 6mm | 5 mm | 70,000 | Fed. Std. Class 100, ISO Class 5 | DIN 912, ISO 4762 | 000000000 | 00000 |
| 10mm | Fully Threaded | Coarse | 10mm | 6mm | 5 mm | 70,000 | Fed. Std. Class 100, ISO Class 5 | DIN 912, ISO 4762 | 000000000 | 00000 |
| 12mm | Fully Threaded | Coarse | 10mm | 6mm | 5 mm | 70,000 | Fed. Std. Class 100, ISO Class 5 | DIN 912, ISO 4762 | 000000000 | 00000 |