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About Rounded Head Screws
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Metric Stainless Steel Pan Head Screws with Internal-Tooth Lock Washer
Made from stainless steel, these screws have good chemical resistance and may be mildly magnetic. They’re passivated for added protection against oxidation and corrosion. The washer has sharp internal teeth that dig into surfaces to resist large amounts of vibration while the smooth outside edge provides a finished look. Also known as Sems screws, the washer rotates freely but is permanently attached. 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 | |||||||||||
M3 × 0.5 mm | |||||||||||
| 20 | Fully Threaded | 5.60 | 2.40 | 6.50 | 0.45 | No. 1 | 70,000 | JIS B 1188-D | 10 | 000000000 | 000000 |
| 25 | Fully Threaded | 5.60 | 2.40 | 6.50 | 0.45 | No. 1 | 70,000 | JIS B 1188-D | 10 | 000000000 | 00000 |
M4 × 0.7 mm | |||||||||||
| 5 | Fully Threaded | 7.00 | 2.75 | 8.50 | 0.60 | No. 2 | 70,000 | JIS B 1188-D | 25 | 000000000 | 00000 |
M5 × 0.8 mm | |||||||||||
| 12 | Fully Threaded | 10.00 | 3.80 | 10.00 | 0.60 | No. 2 | 70,000 | JIS B 1188-D | 10 | 000000000 | 00000 |