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ASME B18.6.7M Metric Machine Screws
Versatile small-diameter metric screws designed for fastening metal components, electronics, and light machinery in precision assemblies.
ASME B18.6.7M Metric Machine Screws cover a broad range of small-diameter fasteners used to join metal parts, secure electronic components, and assemble light machinery. Unlike structural bolts, machine screws are generally used with nuts or threaded into tapped holes and are available in a wide variety of head styles (pan, flat, oval, round) and drive types (slotted, Phillips, hex). They are essential in the manufacturing of computers, appliances, instruments, and automotive interiors. The ASME B18.6.7M standard specifies the dimensions, thread pitches, and tolerances for these smaller fasteners in metric units, ensuring they fit precisely into the delicate and tightly toleranced components of modern technology. Their versatility and availability in materials like stainless steel, brass, and nylon make them indispensable for applications requiring corrosion resistance, electrical insulation, or aesthetic matching.
| Nominal Size and Thread Pitch | DS | Sa | Ea | K | DA | R | |||
|---|---|---|---|---|---|---|---|---|---|
| Body Diameter | Hex Width Across Flats | Hex Width Across Corners | Head Height | Underhead Fillet | |||||
| Transition Dia | Radius | ||||||||
| Max | Min | Max | Min | Min | Max | Min | Max | Min | |
| ASME B18.6.7M - M2 × 0.4 | 2 | 1.65 | 3.2 | 3.02 | 3.38 | 1.6 | 1.3 | 2.6 | 0.1 |
| ASME B18.6.7M - M2.5 × 0.45 | 2.5 | 2.12 | 4 | 3.82 | 4.28 | 2.1 | 1.8 | 3.1 | 0.1 |
| ASME B18.6.7M - M3 × 0.5 | 3 | 2.58 | 5 | 4.82 | 5.4 | 2.3 | 2 | 3.6 | 0.1 |
| ASME B18.6.7M - M3.5 × 0.6 | 3.5 | 3 | 5.5 | 5.32 | 5.96 | 2.6 | 2.3 | 4.1 | 0.1 |
| ASME B18.6.7M - M4 × 0.7 | 4 | 3.43 | 7 | 6.78 | 7.59 | 3 | 2.6 | 4.7 | 0.2 |
| ASME B18.6.7M - M5 × 0.8 | 5 | 4.36 | 8 | 7.78 | 8.71 | 3.8 | 3.3 | 5.7 | 0.2 |
| ASME B18.6.7M - M6 × 1 | 6 | 5.21 | 10 | 9.78 | 10.95 | 4.7 | 4.1 | 6.8 | 0.3 |
| ASME B18.6.7M - M8 × 1.25 | 8 | 7.04 | 13 | 12.73 | 14.26 | 6 | 5.2 | 9.2 | 0.4 |
| ASME B18.6.7M - M10 × 1.5 | 10 | 8.86 | 16 | 15.73 | 17.62 | 7.5 | 6.5 | 11.2 | 0.4 |
| ASME B18.6.7M - M12 × 1.75 | 12 | 10.68 | 18 | 17.73 | 19.86 | 9 | 7.8 | 13.2 | 0.4 |
| ASME B18.6.7M - M10 × 1.5b | 10 | 8.86 | 15 | 14.73 | 16.5 | 7.5 | 6.5 | 11.2 | 0.4 |
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Frequently Asked Questions
- What does ASME B18.6.7M machine screws cover?
- ASME B18.6.7M is the metric dimensional standard for machine screws. It defines head dimensions, body diameter, thread length, total length, drive recess, and tolerances so any compliant machine screws interchanges with standard nuts, washers and wrenches across manufacturers.
- What size range is available for machine screws under ASME B18.6.7M?
- machine screws under ASME B18.6.7M covers M1.6 through M10 nominal diameter, various head styles. TorqBolt manufactures the full range in ASTM A193 Grades B7, B7M, B8, B8M and the full ASTM A320 cryogenic counterpart on customer specification.
- What is the metric/inch counterpart of ASME B18.6.7M machine screws?
- The companion specification for machine screws is ASME B18.6.3 inch machine screws. Both standards share equivalent functional dimensions but use the corresponding measurement system (inch vs metric ISO M-series).
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