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Metric Stainless Steel Pan Head Screws with Spring Lock Washer
These stainless steel screws have good chemical resistance and may be mildly magnetic. A curved washer protects delicate surfaces while providing constant tension. They prevent loosening from small amounts of vibration. Also known as Square Cone Sems screws, the washer rotates freely but is permanently attached. All are passivated for added protection against oxidation and corrosion. Length is measured from under the head.
For technical drawings and 3-D models, click on a part number.
Washer | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| Lg., mm | Threading | Head Dia., mm | Head Ht., mm | OD, mm. | Thick., mm | Drive Size | Tensile Strength, psi  | Specifications Met | Pkg. Qty. | Pkg. | |
18-8 Stainless Steel | |||||||||||
M2.5 × 0.45 mm | |||||||||||
| 5 | Fully Threaded | 5.00 | 2.10 | 6.35 | 0.60 | No. 1 | 70,000 | __ | 10 | 000000000 | 000000 |
| 6 | Fully Threaded | 5.00 | 2.10 | 6.35 | 0.60 | No. 1 | 70,000 | __ | 10 | 000000000 | 00000 |
| 8 | Fully Threaded | 5.00 | 2.10 | 6.35 | 0.60 | No. 1 | 70,000 | __ | 10 | 000000000 | 00000 |
| 10 | Fully Threaded | 5.00 | 2.10 | 6.35 | 0.60 | No. 1 | 70,000 | __ | 10 | 000000000 | 00000 |
M3 × 0.5 mm | |||||||||||
| 5 | Fully Threaded | 5.60 | 2.40 | 7.80 | 0.63 | No. 1 | 70,000 | ASME B18.13 | 10 | 000000000 | 0000 |
| 6 | Fully Threaded | 5.60 | 2.40 | 7.80 | 0.63 | No. 1 | 70,000 | ASME B18.13 | 10 | 000000000 | 0000 |
| 8 | Fully Threaded | 5.60 | 2.40 | 7.80 | 0.63 | No. 1 | 70,000 | ASME B18.13 | 10 | 000000000 | 0000 |
| 10 | Fully Threaded | 5.60 | 2.40 | 7.80 | 0.63 | No. 1 | 70,000 | ASME B18.13 | 10 | 000000000 | 0000 |
| 12 | Fully Threaded | 5.60 | 2.40 | 7.80 | 0.63 | No. 1 | 70,000 | ASME B18.13 | 10 | 000000000 | 0000 |
M4 × 0.7 mm | |||||||||||
| 6 | Fully Threaded | 8.00 | 3.10 | 8.45 | 0.76 | No. 2 | 70,000 | ASME B18.13 | 10 | 000000000 | 0000 |
| 8 | Fully Threaded | 8.00 | 3.10 | 8.45 | 0.76 | No. 2 | 70,000 | ASME B18.13 | 10 | 000000000 | 0000 |
| 10 | Fully Threaded | 8.00 | 3.10 | 8.45 | 0.76 | No. 2 | 70,000 | ASME B18.13 | 10 | 000000000 | 0000 |
| 12 | Fully Threaded | 8.00 | 3.10 | 8.45 | 0.76 | No. 2 | 70,000 | ASME B18.13 | 10 | 000000000 | 0000 |
| 16 | Fully Threaded | 8.00 | 3.10 | 8.45 | 0.76 | No. 2 | 70,000 | ASME B18.13 | 10 | 000000000 | 0000 |
M5 × 0.8 mm | |||||||||||
| 8 | Fully Threaded | 9.50 | 3.70 | 9.75 | 0.94 | No. 2 | 70,000 | ASME B18.13 | 10 | 000000000 | 0000 |
| 10 | Fully Threaded | 9.50 | 3.70 | 9.75 | 0.94 | No. 2 | 70,000 | ASME B18.13 | 10 | 000000000 | 0000 |
| 12 | Fully Threaded | 9.50 | 3.70 | 9.75 | 0.94 | No. 2 | 70,000 | ASME B18.13 | 10 | 000000000 | 0000 |
| 16 | Fully Threaded | 9.50 | 3.70 | 9.75 | 0.94 | No. 2 | 70,000 | ASME B18.13 | 10 | 000000000 | 00000 |
| 20 | Fully Threaded | 9.50 | 3.70 | 9.75 | 0.94 | No. 2 | 70,000 | ASME B18.13 | 10 | 000000000 | 00000 |
M6 × 1 mm | |||||||||||
| 10 | Fully Threaded | 12.00 | 4.60 | 12.90 | 0.99 | No. 3 | 70,000 | ASME B18.13 | 10 | 000000000 | 00000 |
| 12 | Fully Threaded | 12.00 | 4.60 | 12.90 | 0.99 | No. 3 | 70,000 | ASME B18.13 | 10 | 000000000 | 00000 |
| 16 | Fully Threaded | 12.00 | 4.60 | 12.90 | 0.99 | No. 3 | 70,000 | ASME B18.13 | 10 | 000000000 | 00000 |
| 20 | Fully Threaded | 12.00 | 4.60 | 12.90 | 0.99 | No. 3 | 70,000 | ASME B18.13 | 10 | 000000000 | 00000 |
| 25 | Fully Threaded | 12.00 | 4.60 | 12.90 | 0.99 | No. 3 | 70,000 | ASME B18.13 | 10 | 000000000 | 00000 |
Stainless Steel Pan Head Screws with Spring Lock Washer
Made from stainless steel, these screws have good chemical resistance and may be mildly magnetic. A curved washer protects delicate surfaces while providing constant tension. They prevent loosening from small amounts of vibration. Also known as Square Cone Sems screws, the washer rotates freely but is permanently attached. All are passivated for added protection against oxidation and corrosion. Length is measured from under the head.
For technical drawings and 3-D models, click on a part number.
Washer | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| Lg. | Threading | Head Dia. | Head Ht. | OD | Thick. | Drive Size | Tensile Strength, psi | Specifications Met | Pkg. Qty. | Pkg. | |
18-8 Stainless Steel | |||||||||||
4-40 | |||||||||||
| 3/16" | Fully Threaded | 0.219" | 0.080" | 0.250" | 0.015" | No. 1 | 70,000 | ASME B18.13 | 10 | 000000000 | 00000 |
| 1/4" | Fully Threaded | 0.219" | 0.080" | 0.250" | 0.015" | No. 1 | 70,000 | ASME B18.13 | 25 | 000000000 | 0000 |
| 5/16" | Fully Threaded | 0.219" | 0.080" | 0.250" | 0.015" | No. 1 | 70,000 | ASME B18.13 | 25 | 000000000 | 0000 |
| 3/8" | Fully Threaded | 0.219" | 0.080" | 0.250" | 0.015" | No. 1 | 70,000 | ASME B18.13 | 25 | 000000000 | 0000 |
| 7/16" | Fully Threaded | 0.219" | 0.080" | 0.250" | 0.015" | No. 1 | 70,000 | ASME B18.13 | 25 | 000000000 | 0000 |
| 1/2" | Fully Threaded | 0.219" | 0.080" | 0.250" | 0.015" | No. 1 | 70,000 | ASME B18.13 | 25 | 000000000 | 00000 |
| 5/8" | Fully Threaded | 0.219" | 0.080" | 0.250" | 0.015" | No. 1 | 70,000 | ASME B18.13 | 25 | 000000000 | 00000 |
| 3/4" | Fully Threaded | 0.219" | 0.080" | 0.250" | 0.015" | No. 1 | 70,000 | ASME B18.13 | 10 | 000000000 | 0000 |
| 1" | Fully Threaded | 0.219" | 0.080" | 0.250" | 0.015" | No. 1 | 70,000 | ASME B18.13 | 10 | 000000000 | 0000 |
6-32 | |||||||||||
| 3/16" | Fully Threaded | 0.270" | 0.097" | 0.320" | 0.025" | No. 2 | 70,000 | ASME B18.13 | 10 | 000000000 | 0000 |
| 1/4" | Fully Threaded | 0.270" | 0.097" | 0.320" | 0.025" | No. 2 | 70,000 | ASME B18.13 | 25 | 000000000 | 0000 |
| 5/16" | Fully Threaded | 0.270" | 0.097" | 0.320" | 0.025" | No. 2 | 70,000 | ASME B18.13 | 25 | 000000000 | 0000 |
| 3/8" | Fully Threaded | 0.270" | 0.097" | 0.320" | 0.025" | No. 2 | 70,000 | ASME B18.13 | 25 | 000000000 | 0000 |
| 7/16" | Fully Threaded | 0.270" | 0.097" | 0.320" | 0.025" | No. 2 | 70,000 | ASME B18.13 | 10 | 000000000 | 00000 |
| 1/2" | Fully Threaded | 0.270" | 0.097" | 0.320" | 0.025" | No. 2 | 70,000 | ASME B18.13 | 25 | 000000000 | 0000 |
| 5/8" | Fully Threaded | 0.270" | 0.097" | 0.320" | 0.025" | No. 2 | 70,000 | ASME B18.13 | 10 | 000000000 | 00000 |
| 3/4" | Fully Threaded | 0.270" | 0.097" | 0.320" | 0.025" | No. 2 | 70,000 | ASME B18.13 | 10 | 000000000 | 0000 |
| 1" | Fully Threaded | 0.270" | 0.097" | 0.320" | 0.025" | No. 2 | 70,000 | ASME B18.13 | 10 | 000000000 | 0000 |
8-32 | |||||||||||
| 1/4" | Fully Threaded | 0.322" | 0.115" | 0.383" | 0.030" | No. 2 | 70,000 | ASME B18.13 | 10 | 000000000 | 0000 |
| 3/8" | Fully Threaded | 0.322" | 0.115" | 0.383" | 0.030" | No. 2 | 70,000 | ASME B18.13 | 25 | 000000000 | 0000 |
| 1/2" | Fully Threaded | 0.322" | 0.115" | 0.383" | 0.030" | No. 2 | 70,000 | ASME B18.13 | 25 | 000000000 | 00000 |
| 5/8" | Fully Threaded | 0.322" | 0.115" | 0.383" | 0.030" | No. 2 | 70,000 | ASME B18.13 | 25 | 000000000 | 00000 |
| 3/4" | Fully Threaded | 0.322" | 0.115" | 0.383" | 0.030" | No. 2 | 70,000 | ASME B18.13 | 10 | 000000000 | 0000 |
| 1" | Fully Threaded | 0.322" | 0.115" | 0.383" | 0.030" | No. 2 | 70,000 | ASME B18.13 | 10 | 000000000 | 0000 |
10-24 | |||||||||||
| 3/8" | Fully Threaded | 0.373" | 0.133" | 0.446" | 0.032" | No. 2 | 70,000 | ASME B18.13 | 10 | 000000000 | 0000 |
| 1/2" | Fully Threaded | 0.373" | 0.133" | 0.446" | 0.032" | No. 2 | 70,000 | ASME B18.13 | 10 | 000000000 | 0000 |
| 3/4" | Fully Threaded | 0.373" | 0.133" | 0.446" | 0.032" | No. 2 | 70,000 | ASME B18.13 | 10 | 000000000 | 0000 |
| 1" | Fully Threaded | 0.373" | 0.133" | 0.446" | 0.032" | No. 2 | 70,000 | ASME B18.13 | 10 | 000000000 | 00000 |
10-32 | |||||||||||
| 1/4" | Fully Threaded | 0.373" | 0.133" | 0.446" | 0.032" | No. 2 | 70,000 | ASME B18.13 | 10 | 000000000 | 0000 |
| 3/8" | Fully Threaded | 0.373" | 0.133" | 0.446" | 0.032" | No. 2 | 70,000 | ASME B18.13 | 10 | 000000000 | 0000 |
| 1/2" | Fully Threaded | 0.373" | 0.133" | 0.446" | 0.032" | No. 2 | 70,000 | ASME B18.13 | 25 | 000000000 | 0000 |
| 5/8" | Fully Threaded | 0.373" | 0.133" | 0.446" | 0.032" | No. 2 | 70,000 | ASME B18.13 | 25 | 000000000 | 00000 |
| 3/4" | Fully Threaded | 0.373" | 0.133" | 0.446" | 0.032" | No. 2 | 70,000 | ASME B18.13 | 10 | 000000000 | 0000 |
| 1" | Fully Threaded | 0.373" | 0.133" | 0.446" | 0.032" | No. 2 | 70,000 | ASME B18.13 | 10 | 000000000 | 00000 |
Steel Pan Head Screws with Spring Lock Washer
Also known as Square Cone Sems screws, these screws have a curved washer that protects delicate surfaces while providing constant tension. They prevent loosening from small amounts of vibration. The washer rotates freely but is permanently attached. A zinc plating provides corrosion resistance in wet environments. Length is measured from under the head.
For technical drawings and 3-D models, click on a part number.
Washer | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| Lg. | Threading | Head Dia. | Head Ht. | OD | Thick. | Drive Size | Tensile Strength, psi | Specifications Met | Pkg. Qty. | Pkg. | |
Zinc-Plated Steel | |||||||||||
4-40 | |||||||||||
| 3/16" | Fully Threaded | 0.219" | 0.080" | 0.250" | 0.015" | No. 1 | 60,000 | ASME B18.13 | 25 | 000000000 | 000000 |
| 1/4" | Fully Threaded | 0.219" | 0.080" | 0.250" | 0.015" | No. 1 | 60,000 | ASME B18.13 | 25 | 000000000 | 00000 |
| 5/16" | Fully Threaded | 0.219" | 0.080" | 0.250" | 0.015" | No. 1 | 60,000 | ASME B18.13 | 25 | 000000000 | 00000 |
| 3/8" | Fully Threaded | 0.219" | 0.080" | 0.250" | 0.015" | No. 1 | 60,000 | ASME B18.13 | 25 | 000000000 | 00000 |
| 7/16" | Fully Threaded | 0.219" | 0.080" | 0.250" | 0.015" | No. 1 | 60,000 | ASME B18.13 | 25 | 000000000 | 00000 |
| 1/2" | Fully Threaded | 0.219" | 0.080" | 0.250" | 0.015" | No. 1 | 60,000 | ASME B18.13 | 25 | 000000000 | 00000 |
| 3/4" | Fully Threaded | 0.219" | 0.080" | 0.250" | 0.015" | No. 1 | 60,000 | ASME B18.13 | 25 | 000000000 | 00000 |
6-32 | |||||||||||
| 1/4" | Fully Threaded | 0.270" | 0.097" | 0.320" | 0.030" | No. 2 | 60,000 | ASME B18.13 | 100 | 000000000 | 0000 |
| 5/16" | Fully Threaded | 0.270" | 0.097" | 0.320" | 0.030" | No. 2 | 60,000 | ASME B18.13 | 25 | 000000000 | 00000 |
| 3/8" | Fully Threaded | 0.270" | 0.097" | 0.320" | 0.030" | No. 2 | 60,000 | ASME B18.13 | 100 | 000000000 | 00000 |
| 1/2" | Fully Threaded | 0.270" | 0.097" | 0.320" | 0.030" | No. 2 | 60,000 | ASME B18.13 | 25 | 000000000 | 0000 |
| 3/4" | Fully Threaded | 0.270" | 0.097" | 0.320" | 0.030" | No. 2 | 60,000 | ASME B18.13 | 25 | 000000000 | 00000 |
| 1" | Fully Threaded | 0.270" | 0.097" | 0.320" | 0.030" | No. 2 | 60,000 | ASME B18.13 | 10 | 000000000 | 00000 |
8-32 | |||||||||||
| 1/4" | Fully Threaded | 0.322" | 0.115" | 0.383" | 0.035" | No. 2 | 60,000 | ASME B18.13 | 50 | 000000000 | 00000 |
| 3/8" | Fully Threaded | 0.322" | 0.115" | 0.383" | 0.030" | No. 2 | 60,000 | ASME B18.13 | 100 | 000000000 | 0000 |
| 1/2" | Fully Threaded | 0.322" | 0.115" | 0.383" | 0.030" | No. 2 | 60,000 | ASME B18.13 | 100 | 000000000 | 00000 |
| 3/4" | Fully Threaded | 0.322" | 0.115" | 0.383" | 0.030" | No. 2 | 60,000 | ASME B18.13 | 10 | 000000000 | 0000 |
| 1" | Fully Threaded | 0.322" | 0.115" | 0.383" | 0.030" | No. 2 | 60,000 | ASME B18.13 | 10 | 000000000 | 00000 |
10-32 | |||||||||||
| 1/4" | Fully Threaded | 0.373" | 0.133" | 0.446" | 0.032" | No. 2 | 60,000 | ASME B18.13 | 25 | 000000000 | 00000 |
| 3/8" | Fully Threaded | 0.373" | 0.133" | 0.446" | 0.032" | No. 2 | 60,000 | ASME B18.13 | 25 | 000000000 | 00000 |
| 1/2" | Fully Threaded | 0.373" | 0.133" | 0.446" | 0.032" | No. 2 | 60,000 | ASME B18.13 | 25 | 000000000 | 00000 |
| 5/8" | Fully Threaded | 0.373" | 0.133" | 0.446" | 0.035" | No. 2 | 60,000 | ASME B18.13 | 25 | 000000000 | 00000 |
| 3/4" | Fully Threaded | 0.373" | 0.133" | 0.446" | 0.032" | No. 2 | 60,000 | ASME B18.13 | 25 | 000000000 | 00000 |
| 1" | Fully Threaded | 0.373" | 0.133" | 0.446" | 0.032" | No. 2 | 60,000 | ASME B18.13 | 25 | 000000000 | 00000 |
1/4"-20 | |||||||||||
| 3/8" | Fully Threaded | 0.492" | 0.175" | 0.508" | 0.039" | No. 3 | 60,000 | ASME B18.13 | 25 | 000000000 | 00000 |
| 1/2" | Fully Threaded | 0.492" | 0.175" | 0.508" | 0.039" | No. 3 | 60,000 | ASME B18.13 | 25 | 000000000 | 00000 |
| 3/4" | Fully Threaded | 0.492" | 0.175" | 0.508" | 0.039" | No. 3 | 60,000 | ASME B18.13 | 25 | 000000000 | 00000 |
| 1" | Fully Threaded | 0.492" | 0.175" | 0.508" | 0.039" | No. 3 | 60,000 | ASME B18.13 | 25 | 000000000 | 00000 |
| 1 1/2" | Fully Threaded | 0.492" | 0.175" | 0.508" | 0.039" | No. 3 | 60,000 | ASME B18.13 | 25 | 000000000 | 00000 |