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About Hex Head Screws and Bolts
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JIS Medium-Strength Steel Hex Head Screws
Made to Japanese Industrial Standards, these Class 8.8 steel screws are good for fastening most machinery and equipment. Their head is about 10% smaller than those made to ISO standards, so they fit into tighter spaces than other metric screws. To prevent corrosion in wet environments, these screws are plated with either clear zinc or zinc yellow chromate. Length is measured from under the head.
Match the thread spacing of mating components. Coarse threads are the industry standard; choose these screws if you don’t know the pitch. Fine threads are closely spaced to prevent loosening from vibration.
Head | |||||||||
|---|---|---|---|---|---|---|---|---|---|
| Lg., mm | Threading | Thread Spacing | Wd., mm | Ht., mm | Tensile Strength, psi | Specifications Met | Pkg. Qty. | Pkg. | |
Zinc-Plated Class 8.8 Steel | |||||||||
M8 × 1.25 mm | |||||||||
| 12 | Fully Threaded | Coarse | 12 | 5.5 | 110,000 | JIS B 1180 | 10 | 000000000 | 000000 |
| 16 | Fully Threaded | Coarse | 12 | 5.5 | 110,000 | JIS B 1180 | 10 | 000000000 | 00000 |
| 20 | Fully Threaded | Coarse | 12 | 5.5 | 110,000 | JIS B 1180 | 10 | 000000000 | 00000 |
| 25 | Fully Threaded | Coarse | 12 | 5.5 | 110,000 | JIS B 1180 | 10 | 000000000 | 00000 |
| 30 | Fully Threaded | Coarse | 12 | 5.5 | 110,000 | JIS B 1180 | 10 | 000000000 | 00000 |
| 40 | Fully Threaded | Coarse | 12 | 5.5 | 110,000 | JIS B 1180 | 5 | 000000000 | 0000 |
| 60 | Fully Threaded | Coarse | 12 | 5.5 | 110,000 | JIS B 1180 | 5 | 000000000 | 00000 |
M10 × 1.25 mm | |||||||||
| 20 | Fully Threaded | Fine | 14 | 7 | 110,000 | JIS B 1180 | 5 | 000000000 | 00000 |
| 25 | Fully Threaded | Fine | 14 | 7 | 110,000 | JIS B 1180 | 5 | 000000000 | 00000 |
| 30 | Fully Threaded | Fine | 14 | 7 | 110,000 | JIS B 1180 | 5 | 000000000 | 00000 |
| 35 | Fully Threaded | Fine | 14 | 7 | 110,000 | JIS B 1180 | 5 | 000000000 | 00000 |
| 70 | Fully Threaded | Fine | 14 | 7 | 110,000 | JIS B 1180 | 5 | 000000000 | 00000 |
M10 × 1.5 mm | |||||||||
| 20 | Fully Threaded | Coarse | 14 | 7 | 110,000 | JIS B 1180 | 5 | 000000000 | 00000 |
| 25 | Fully Threaded | Coarse | 14 | 7 | 110,000 | JIS B 1180 | 5 | 000000000 | 00000 |
| 30 | Fully Threaded | Coarse | 14 | 7 | 110,000 | JIS B 1180 | 5 | 000000000 | 00000 |
| 35 | Fully Threaded | Coarse | 14 | 7 | 110,000 | JIS B 1180 | 5 | 000000000 | 00000 |
Zinc Yellow-Chromate Plated Class 8.8 Steel | |||||||||
M8 × 1.25 mm | |||||||||
| 12 | Fully Threaded | Coarse | 12 | 5.5 | 110,000 | JIS B 1180 | 5 | 000000000 | 0000 |
| 16 | Fully Threaded | Coarse | 12 | 5.5 | 110,000 | JIS B 1180 | 5 | 000000000 | 0000 |
| 20 | Fully Threaded | Coarse | 12 | 5.5 | 110,000 | JIS B 1180 | 5 | 000000000 | 0000 |
| 25 | Fully Threaded | Coarse | 12 | 5.5 | 110,000 | JIS B 1180 | 5 | 000000000 | 0000 |
| 30 | Fully Threaded | Coarse | 12 | 5.5 | 110,000 | JIS B 1180 | 5 | 000000000 | 0000 |
| 35 | Fully Threaded | Coarse | 12 | 5.5 | 110,000 | JIS B 1180 | 5 | 000000000 | 0000 |
| 40 | Fully Threaded | Coarse | 12 | 5.5 | 110,000 | JIS B 1180 | 5 | 000000000 | 0000 |
| 45 | Fully Threaded | Coarse | 12 | 5.5 | 110,000 | JIS B 1180 | 5 | 000000000 | 0000 |
| 50 | Fully Threaded | Coarse | 12 | 5.5 | 110,000 | JIS B 1180 | 5 | 000000000 | 00000 |
| 60 | Fully Threaded | Coarse | 12 | 5.5 | 110,000 | JIS B 1180 | 5 | 000000000 | 00000 |
| 70 | Fully Threaded | Coarse | 12 | 5.5 | 110,000 | JIS B 1180 | 5 | 000000000 | 00000 |
M10 × 1.25 mm | |||||||||
| 20 | Fully Threaded | Fine | 14 | 7 | 110,000 | JIS B 1180 | 5 | 000000000 | 00000 |
| 25 | Fully Threaded | Fine | 14 | 7 | 110,000 | JIS B 1180 | 5 | 000000000 | 00000 |
| 30 | Fully Threaded | Fine | 14 | 7 | 110,000 | JIS B 1180 | 5 | 000000000 | 00000 |
| 35 | Fully Threaded | Fine | 14 | 7 | 110,000 | JIS B 1180 | 5 | 000000000 | 00000 |
| 40 | Fully Threaded | Fine | 14 | 7 | 110,000 | JIS B 1180 | 5 | 000000000 | 00000 |
| 45 | Fully Threaded | Fine | 14 | 7 | 110,000 | JIS B 1180 | 5 | 000000000 | 00000 |
| 50 | Fully Threaded | Fine | 14 | 7 | 110,000 | JIS B 1180 | 5 | 000000000 | 00000 |
| 60 | Fully Threaded | Fine | 14 | 7 | 110,000 | JIS B 1180 | 5 | 000000000 | 00000 |
| 70 | Fully Threaded | Fine | 14 | 7 | 110,000 | JIS B 1180 | 5 | 000000000 | 00000 |
JIS High-Strength Steel Flanged Hex Head Screws
Fully Threaded
Partially Threaded
Made to Japanese Industrial Standards, these Class 10.9 steel screws can be used in high-stress applications, such as valves, pumps, motors, and automotive suspension systems. They are at least 25% stronger than medium-strength steel screws. The flange distributes pressure where the screw meets the surface, eliminating the need for a separate washer. The zinc plating provides corrosion resistance in wet environments. Head height includes the flange. Length is measured from under the flange.
Match the thread spacing of mating components. Coarse threads are the industry standard; choose these screws if you don’t know the pitch. Fine and extra-fine threads are closely spaced to prevent loosening from vibration; the finer the thread, the better the resistance.
Head, mm | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| Lg., mm | Threading | Min. Thread Lg., mm | Thread Spacing | Wd. | Ht. | Flange Dia., mm | Tensile Strength, psi | Specifications Met | Pkg. Qty. | Pkg. | |
Zinc-Plated Class 10.9 Steel | |||||||||||
M5 × 0.8 mm | |||||||||||
| 8 | Fully Threaded | __ | Coarse | 8 | 5 | 12 | 150,000 | JIS B 1189 Type 2 | 25 | 000000000 | 000000 |
| 10 | Fully Threaded | __ | Coarse | 8 | 5 | 12 | 150,000 | JIS B 1189 Type 2 | 25 | 000000000 | 00000 |
| 12 | Fully Threaded | __ | Coarse | 8 | 5 | 12 | 150,000 | JIS B 1189 Type 2 | 25 | 000000000 | 00000 |
| 16 | Fully Threaded | __ | Coarse | 8 | 5 | 12 | 150,000 | JIS B 1189 Type 2 | 25 | 000000000 | 00000 |
| 20 | Fully Threaded | __ | Coarse | 8 | 5 | 12 | 150,000 | JIS B 1189 Type 2 | 25 | 000000000 | 00000 |
| 25 | Fully Threaded | __ | Coarse | 8 | 5 | 12 | 150,000 | JIS B 1189 Type 2 | 25 | 000000000 | 00000 |
| 30 | Fully Threaded | __ | Coarse | 8 | 5 | 12 | 150,000 | JIS B 1189 Type 2 | 25 | 000000000 | 00000 |
| 40 | Fully Threaded | __ | Coarse | 8 | 5 | 12 | 150,000 | JIS B 1189 Type 2 | 25 | 000000000 | 00000 |
M6 × 1 mm | |||||||||||
| 10 | Fully Threaded | __ | Coarse | 10 | 6 | 14 | 150,000 | JIS B 1189 Type 2 | 25 | 000000000 | 0000 |
| 12 | Fully Threaded | __ | Coarse | 10 | 6 | 14 | 150,000 | JIS B 1189 Type 2 | 50 | 000000000 | 0000 |
| 14 | Fully Threaded | __ | Coarse | 10 | 6 | 14 | 150,000 | JIS B 1189 Type 2 | 25 | 000000000 | 00000 |
| 16 | Fully Threaded | __ | Coarse | 10 | 6 | 14 | 150,000 | JIS B 1189 Type 2 | 50 | 000000000 | 0000 |
| 20 | Fully Threaded | __ | Coarse | 10 | 6 | 14 | 150,000 | JIS B 1189 Type 2 | 50 | 000000000 | 0000 |
| 25 | Fully Threaded | __ | Coarse | 10 | 6 | 14 | 150,000 | JIS B 1189 Type 2 | 50 | 000000000 | 00000 |
| 30 | Partially Threaded | 18 | Coarse | 10 | 6 | 14 | 150,000 | JIS B 1189 Type 2 | 50 | 000000000 | 00000 |
| 35 | Partially Threaded | 18 | Coarse | 10 | 6 | 14 | 150,000 | JIS B 1189 Type 2 | 50 | 000000000 | 00000 |
| 40 | Partially Threaded | 18 | Coarse | 10 | 6 | 14 | 150,000 | JIS B 1189 Type 2 | 50 | 000000000 | 00000 |
M8 × 1.25 mm | |||||||||||
| 10 | Fully Threaded | __ | Coarse | 12 | 8 | 17.5 | 150,000 | JIS B 1189 Type 2 | 25 | 000000000 | 00000 |
| 12 | Fully Threaded | __ | Coarse | 12 | 8 | 17.5 | 150,000 | JIS B 1189 Type 2 | 25 | 000000000 | 0000 |
| 14 | Fully Threaded | __ | Coarse | 12 | 8 | 17.5 | 150,000 | JIS B 1189 Type 2 | 25 | 000000000 | 00000 |
| 16 | Fully Threaded | __ | Coarse | 12 | 8 | 17.5 | 150,000 | JIS B 1189 Type 2 | 25 | 000000000 | 0000 |
| 18 | Fully Threaded | __ | Coarse | 12 | 8 | 17.5 | 150,000 | JIS B 1189 Type 2 | 25 | 000000000 | 00000 |
| 20 | Fully Threaded | __ | Coarse | 12 | 8 | 17.5 | 150,000 | JIS B 1189 Type 2 | 25 | 000000000 | 0000 |
| 25 | Fully Threaded | __ | Coarse | 12 | 8 | 17.5 | 150,000 | JIS B 1189 Type 2 | 25 | 000000000 | 00000 |
| 30 | Fully Threaded | __ | Coarse | 12 | 8 | 17.5 | 150,000 | JIS B 1189 Type 2 | 25 | 000000000 | 00000 |
| 35 | Partially Threaded | 22 | Coarse | 12 | 8 | 17.5 | 150,000 | JIS B 1189 Type 2 | 25 | 000000000 | 00000 |
| 40 | Partially Threaded | 22 | Coarse | 12 | 8 | 17.5 | 150,000 | JIS B 1189 Type 2 | 25 | 000000000 | 00000 |
| 45 | Partially Threaded | 22 | Coarse | 12 | 8 | 17.5 | 150,000 | JIS B 1189 Type 2 | 25 | 000000000 | 00000 |
| 50 | Partially Threaded | 22 | Coarse | 12 | 8 | 17.5 | 150,000 | JIS B 1189 Type 2 | 25 | 000000000 | 00000 |
| 60 | Partially Threaded | 22 | Coarse | 12 | 8 | 17.5 | 150,000 | JIS B 1189 Type 2 | 25 | 000000000 | 00000 |
| 65 | Partially Threaded | 24 | Coarse | 12 | 8 | 17.5 | 150,000 | JIS B 1189 Type 2 | 5 | 000000000 | 00000 |
| 70 | Partially Threaded | 24 | Coarse | 12 | 8 | 17.5 | 150,000 | JIS B 1189 Type 2 | 5 | 000000000 | 00000 |
M10 × 1.25 mm | |||||||||||
| 16 | Fully Threaded | __ | Fine | 14 | 10 | 21 | 150,000 | JIS B 1189 Type 2 | 25 | 000000000 | 00000 |
| 20 | Fully Threaded | __ | Fine | 14 | 10 | 21 | 150,000 | JIS B 1189 Type 2 | 25 | 000000000 | 00000 |
| 25 | Fully Threaded | __ | Fine | 14 | 10 | 21 | 150,000 | JIS B 1189 Type 2 | 25 | 000000000 | 00000 |
| 30 | Fully Threaded | __ | Fine | 14 | 10 | 21 | 150,000 | JIS B 1189 Type 2 | 10 | 000000000 | 0000 |
| 35 | Fully Threaded | __ | Fine | 14 | 10 | 21 | 150,000 | JIS B 1189 Type 2 | 10 | 000000000 | 0000 |
| 40 | Partially Threaded | 26 | Fine | 14 | 10 | 21 | 150,000 | JIS B 1189 Type 2 | 10 | 000000000 | 0000 |
| 45 | Partially Threaded | 26 | Fine | 14 | 10 | 21 | 150,000 | JIS B 1189 Type 2 | 10 | 000000000 | 0000 |
| 50 | Partially Threaded | 26 | Fine | 14 | 10 | 21 | 150,000 | JIS B 1189 Type 2 | 10 | 000000000 | 0000 |
| 60 | Partially Threaded | 26 | Fine | 14 | 10 | 21 | 150,000 | JIS B 1189 Type 2 | 10 | 000000000 | 00000 |
| 70 | Partially Threaded | 26 | Fine | 14 | 10 | 21 | 150,000 | JIS B 1189 Type 2 | 10 | 000000000 | 00000 |
| 80 | Partially Threaded | 26 | Fine | 14 | 10 | 21 | 150,000 | JIS B 1189 Type 2 | 10 | 000000000 | 00000 |
| 90 | Partially Threaded | 26 | Fine | 14 | 10 | 21 | 150,000 | JIS B 1189 Type 2 | 10 | 000000000 | 00000 |
| 100 | Partially Threaded | 26 | Fine | 14 | 10 | 21 | 150,000 | JIS B 1189 Type 2 | 10 | 000000000 | 00000 |
M12 × 1.25 mm | |||||||||||
| 20 | Fully Threaded | __ | Extra Fine | 17 | 11.5 | 25 | 150,000 | JIS B 1189 Type 2 | 10 | 000000000 | 0000 |
| 25 | Fully Threaded | __ | Extra Fine | 17 | 11.5 | 25 | 150,000 | JIS B 1189 Type 2 | 10 | 000000000 | 0000 |
| 30 | Fully Threaded | __ | Extra Fine | 17 | 11.5 | 25 | 150,000 | JIS B 1189 Type 2 | 10 | 000000000 | 00000 |
| 35 | Fully Threaded | __ | Extra Fine | 17 | 11.5 | 25 | 150,000 | JIS B 1189 Type 2 | 10 | 000000000 | 00000 |
| 40 | Partially Threaded | 30 | Extra Fine | 17 | 11.5 | 25 | 150,000 | JIS B 1189 Type 2 | 10 | 000000000 | 00000 |
| 45 | Partially Threaded | 30 | Extra Fine | 17 | 11.5 | 25 | 150,000 | JIS B 1189 Type 2 | 10 | 000000000 | 00000 |
| 50 | Partially Threaded | 30 | Extra Fine | 17 | 11.5 | 25 | 150,000 | JIS B 1189 Type 2 | 10 | 000000000 | 00000 |
| 55 | Partially Threaded | 30 | Extra Fine | 17 | 11.5 | 25 | 150,000 | JIS B 1189 Type 2 | 10 | 000000000 | 00000 |