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About Nuts, Materials, and Finishes
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Low-Strength Steel Thin Hex Nuts

Also known as jam nuts, these are about half the height of standard hex nuts. Use them in low-clearance applications or jam one against another nut to hold it in place. About half the strength of medium-strength steel thin nuts, use them for light duty fastening applications, such as securing access panels. Some of these screws meet ISO and DIN dimensional standards.
Nuts with fine and extra-fine thread spacing are less likely to loosen from vibration than nuts with coarse thread spacing.
Zinc-plated and zinc yellow-chromate plated steel nuts resist corrosion in wet environments.
The distinctive coloring on blue-dyed steel nuts makes them easy to distinguish from inch-size nuts.
Nuts that meet ISO 4035 (formerly DIN 439B) adhere to international standards for dimensions and material composition to ensure compatibility with other products and tools. Although the DIN 439B standards are no longer active, they are commonly referenced globally.
For technical drawings and 3-D models, click on a part number.
Thread | ||||||||
---|---|---|---|---|---|---|---|---|
Size | Pitch, mm | Spacing | Wd., mm | Ht., mm | Specifications Met | Pkg. Qty. | Pkg. | |
Zinc-Plated Steel—Class 04 | ||||||||
M2 | 0.4 | Coarse | 4 | 1.2 | DIN 439B, ISO 4035 | 100 | 000000000 | 00000 |
M2.5 | 0.45 | Coarse | 5 | 1.6 | DIN 439B, ISO 4035 | 100 | 000000000 | 0000 |
M3 | 0.5 | Coarse | 5.5 | 1.8 | DIN 439B, ISO 4035 | 100 | 000000000 | 0000 |
M3.5 | 0.6 | Coarse | 6 | 2 | DIN 439B, ISO 4035 | 100 | 000000000 | 00000 |
M4 | 0.7 | Coarse | 7 | 2.2 | DIN 439B, ISO 4035 | 100 | 000000000 | 0000 |
M5 | 0.5 | Fine | 8 | 2.7 | DIN 439B, ISO 4035 | 25 | 000000000 | 00000 |
M5 | 0.8 | Coarse | 8 | 2.7 | DIN 439B, ISO 4035 | 100 | 000000000 | 0000 |
M6 | 0.75 | Fine | 10 | 3.2 | DIN 439B, ISO 4035 | 25 | 000000000 | 00000 |
M6 | 1 | Coarse | 10 | 3.2 | DIN 439B, ISO 4035 | 100 | 000000000 | 0000 |
M7 | 1 | Coarse | 11 | 3.5 | DIN 439B, ISO 4035 | 100 | 000000000 | 00000 |
M8 | 1 | Fine | 13 | 4 | DIN 439B, ISO 4035 | 100 | 000000000 | 0000 |
M8 | 1.25 | Coarse | 13 | 4 | DIN 439B, ISO 4035 | 100 | 000000000 | 0000 |
M10 | 1 | Extra Fine | 17 | 5 | DIN 439B, ISO 4035 | 100 | 000000000 | 00000 |
M10 | 1.25 | Fine | 17 | 5 | DIN 439B, ISO 4035 | 100 | 000000000 | 00000 |
M10 | 1.5 | Coarse | 17 | 5 | DIN 439B, ISO 4035 | 100 | 000000000 | 00000 |
M12 | 1 | Extra Fine | 19 | 6 | DIN 439B, ISO 4035 | 25 | 000000000 | 0000 |
M12 | 1.25 | Extra Fine | 19 | 6 | DIN 439B, ISO 4035 | 50 | 000000000 | 0000 |
M12 | 1.5 | Fine | 19 | 6 | DIN 439B, ISO 4035 | 25 | 000000000 | 0000 |
M12 | 1.75 | Coarse | 19 | 6 | DIN 439B, ISO 4035 | 50 | 000000000 | 00000 |
M14 | 1.25 | Extra Fine | 22 | 7 | DIN 439B, ISO 4035 | 10 | 000000000 | 00000 |
M14 | 1.5 | Fine | 22 | 7 | DIN 439B, ISO 4035 | 25 | 000000000 | 0000 |
M14 | 2 | Coarse | 22 | 7 | DIN 439B, ISO 4035 | 25 | 000000000 | 00000 |
M16 | 1 | Extra Fine | 24 | 8 | DIN 439B, ISO 4035 | 5 | 000000000 | 00000 |
M16 | 1.5 | Fine | 24 | 8 | DIN 439B, ISO 4035 | 10 | 000000000 | 0000 |
M16 | 2 | Coarse | 24 | 8 | DIN 439B, ISO 4035 | 25 | 000000000 | 00000 |
M18 | 1.5 | Fine | 27 | 9 | DIN 439B, ISO 4035 | 10 | 000000000 | 0000 |
M18 | 2.5 | Coarse | 27 | 9 | DIN 439B, ISO 4035 | 10 | 000000000 | 0000 |
M20 | 1.5 | Extra Fine | 30 | 10 | DIN 439B, ISO 4035 | 10 | 000000000 | 0000 |
M20 | 2.5 | Coarse | 30 | 10 | DIN 439B, ISO 4035 | 10 | 000000000 | 00000 |
M22 | 1.5 | Fine | 32 | 11 | DIN 439B, ISO 4035 | 10 | 000000000 | 00000 |
M22 | 2.5 | Coarse | 32 | 11 | DIN 439B, ISO 4035 | 1 | 000000000 | 0000 |
M24 | 1.5 | Extra Fine | 36 | 12 | DIN 439B, ISO 4035 | 5 | 000000000 | 00000 |
M24 | 2 | Fine | 36 | 12 | DIN 439B, ISO 4035 | 5 | 000000000 | 00000 |
M24 | 3 | Coarse | 36 | 12 | DIN 439B, ISO 4035 | 5 | 000000000 | 00000 |
M27 | 2 | Fine | 41 | 13.5 | DIN 439B, ISO 4035 | 1 | 000000000 | 0000 |
M27 | 3 | Coarse | 41 | 13.5 | DIN 439B, ISO 4035 | 5 | 000000000 | 00000 |
M30 | 2 | Fine | 46 | 15 | DIN 439B, ISO 4035 | 1 | 000000000 | 0000 |
M30 | 3.5 | Coarse | 46 | 15 | DIN 439B, ISO 4035 | 1 | 000000000 | 0000 |
M36 | 3 | Fine | 55 | 18 | DIN 439B, ISO 4035 | 1 | 000000000 | 00000 |
M36 | 4 | Coarse | 55 | 18 | DIN 439B, ISO 4035 | 1 | 000000000 | 00000 |
M42 | 4.5 | Coarse | 65 | 21 | DIN 439B, ISO 4035 | 1 | 000000000 | 00000 |
M48 | 5 | Coarse | 75 | 24 | DIN 439B, ISO 4035 | 1 | 000000000 | 00000 |
Zinc Yellow-Chromate Plated Steel—Class 04 | ||||||||
M4 | 0.7 | Coarse | 7 | 2.2 | DIN 439B, ISO 4035 | 100 | 000000000 | 0000 |
M5 | 0.8 | Coarse | 8 | 2.7 | DIN 439B, ISO 4035 | 100 | 000000000 | 0000 |
M6 | 1 | Coarse | 10 | 3.2 | DIN 439B, ISO 4035 | 100 | 000000000 | 0000 |
M8 | 1 | Fine | 13 | 4 | DIN 439B, ISO 4035 | 25 | 000000000 | 00000 |
M8 | 1.25 | Coarse | 13 | 4 | DIN 439B, ISO 4035 | 100 | 000000000 | 00000 |
M10 | 1.25 | Fine | 17 | 5 | DIN 439B, ISO 4035 | 25 | 000000000 | 0000 |
M10 | 1.5 | Coarse | 17 | 5 | DIN 439B, ISO 4035 | 50 | 000000000 | 00000 |
M12 | 1.5 | Fine | 19 | 6 | DIN 439B, ISO 4035 | 25 | 000000000 | 0000 |
M12 | 1.75 | Coarse | 19 | 6 | DIN 439B, ISO 4035 | 50 | 000000000 | 00000 |
M14 | 1.5 | Fine | 22 | 7 | DIN 439B, ISO 4035 | 25 | 000000000 | 0000 |
M14 | 2 | Coarse | 22 | 7 | DIN 439B, ISO 4035 | 10 | 000000000 | 0000 |
M16 | 1.5 | Fine | 24 | 8 | DIN 439B, ISO 4035 | 10 | 000000000 | 0000 |
M16 | 2 | Coarse | 24 | 8 | DIN 439B, ISO 4035 | 25 | 000000000 | 00000 |
M18 | 1.5 | Fine | 27 | 9 | DIN 439B, ISO 4035 | 5 | 000000000 | 0000 |
M20 | 1.5 | Extra Fine | 30 | 10 | DIN 439B, ISO 4035 | 10 | 000000000 | 0000 |
M20 | 2.5 | Coarse | 30 | 10 | DIN 439B, ISO 4035 | 10 | 000000000 | 00000 |
M22 | 1.5 | Fine | 32 | 11 | DIN 439B, ISO 4035 | 5 | 000000000 | 0000 |
M30 | 2 | Fine | 46 | 15 | DIN 439B, ISO 4035 | 1 | 000000000 | 0000 |
Blue Dyed Steel—Class 04 | ||||||||
M6 | 1 | Coarse | 10 | 3.2 | DIN 439B, ISO 4035 | 50 | 000000000 | 0000 |
M8 | 1.25 | Coarse | 13 | 4 | DIN 439B, ISO 4035 | 50 | 000000000 | 0000 |
M10 | 1.5 | Coarse | 17 | 5 | DIN 439B, ISO 4035 | 50 | 000000000 | 0000 |
M12 | 1.75 | Coarse | 19 | 6 | DIN 439B, ISO 4035 | 25 | 000000000 | 0000 |
M16 | 2 | Coarse | 24 | 8 | DIN 439B, ISO 4035 | 10 | 000000000 | 0000 |
M20 | 2.5 | Coarse | 30 | 10 | DIN 439B, ISO 4035 | 10 | 000000000 | 00000 |
M24 | 3 | Coarse | 36 | 12 | DIN 439B, ISO 4035 | 1 | 000000000 | 0000 |
Steel—Class 04 | ||||||||
M4 | 0.7 | Coarse | 7 | 2.2 | DIN 439B, ISO 4035 | 100 | 000000000 | 0000 |
M5 | 0.8 | Coarse | 8 | 2.7 | DIN 439B, ISO 4035 | 100 | 000000000 | 0000 |
M6 | 1 | Coarse | 10 | 3.2 | DIN 439B, ISO 4035 | 100 | 000000000 | 0000 |
M8 | 1 | Fine | 13 | 4 | DIN 439B, ISO 4035 | 50 | 000000000 | 00000 |
M8 | 1.25 | Coarse | 13 | 4 | DIN 439B, ISO 4035 | 100 | 000000000 | 0000 |
M10 | 1.25 | Fine | 17 | 5 | DIN 439B, ISO 4035 | 50 | 000000000 | 00000 |
M10 | 1.5 | Coarse | 17 | 5 | DIN 439B, ISO 4035 | 100 | 000000000 | 00000 |
M12 | 1.5 | Fine | 19 | 6 | DIN 439B, ISO 4035 | 25 | 000000000 | 00000 |
M12 | 1.75 | Coarse | 19 | 6 | DIN 439B, ISO 4035 | 50 | 000000000 | 0000 |
M14 | 1.5 | Fine | 22 | 7 | DIN 439B, ISO 4035 | 50 | 000000000 | 00000 |
M16 | 1.5 | Fine | 24 | 8 | DIN 439B, ISO 4035 | 25 | 000000000 | 00000 |
M16 | 2 | Coarse | 24 | 8 | DIN 439B, ISO 4035 | 25 | 000000000 | 0000 |
M18 | 1.5 | Fine | 27 | 9 | DIN 439B, ISO 4035 | 10 | 000000000 | 0000 |
M20 | 1.5 | Extra Fine | 30 | 10 | DIN 439B, ISO 4035 | 10 | 000000000 | 0000 |
M20 | 2.5 | Coarse | 30 | 10 | DIN 439B, ISO 4035 | 10 | 000000000 | 0000 |
M22 | 1.5 | Fine | 32 | 11 | DIN 439B, ISO 4035 | 10 | 000000000 | 0000 |
M24 | 1.5 | Extra Fine | 36 | 12 | DIN 439B, ISO 4035 | 5 | 000000000 | 00000 |
M24 | 2 | Fine | 36 | 12 | DIN 439B, ISO 4035 | 5 | 000000000 | 00000 |
M24 | 3 | Coarse | 36 | 12 | DIN 439B, ISO 4035 | 5 | 000000000 | 0000 |
M27 | 1.5 | Extra Fine | 41 | 13.5 | DIN 439B, ISO 4035 | 1 | 000000000 | 00000 |
M27 | 2 | Fine | 41 | 13.5 | DIN 439B, ISO 4035 | 1 | 000000000 | 0000 |
M30 | 2 | Fine | 46 | 15 | DIN 439B, ISO 4035 | 1 | 000000000 | 0000 |
M33 | 2 | Fine | 50 | 16.5 | DIN 439B, ISO 4035 | 1 | 000000000 | 00000 |
M36 | 3 | Fine | 55 | 18 | DIN 439B, ISO 4035 | 1 | 000000000 | 00000 |
M36 | 4 | Coarse | 55 | 18 | DIN 439B, ISO 4035 | 1 | 000000000 | 0000 |
M39 | 3 | Fine | 60 | 19.5 | DIN 439B, ISO 4035 | 1 | 000000000 | 00000 |
M42 | 3 | Fine | 65 | 21 | DIN 439B, ISO 4035 | 1 | 000000000 | 00000 |
M48 | 3 | Fine | 75 | 24 | DIN 439B, ISO 4035 | 1 | 000000000 | 00000 |
M48 | 5 | Coarse | 75 | 24 | DIN 439B, ISO 4035 | 1 | 000000000 | 00000 |
M45 | 3 | Fine | 70 | 22.5 | DIN 439B, ISO 4035 | 1 | 000000000 | 00000 |
M52 | 3 | Extra Fine | 80 | 26 | DIN 439B, ISO 4035 | 1 | 000000000 | 00000 |
M52 | 5 | Coarse | 80 | 26 | DIN 439B, ISO 4035 | 1 | 000000000 | 00000 |
Left-Hand Threaded Low-Strength Steel Thin Hex Nuts


These nuts tighten when turned to the left; once fastened, they resist loosening from counterclockwise motion. Also known as jam nuts, they are about half the height of standard hex nuts. Use them in low-clearance applications or jam one against another nut to hold it in place. About half the strength of medium-strength steel thin nuts, use them for light duty fastening applications, such as securing access panels.
Black-oxide steel nuts have a dark surface color and are mildly corrosion resistant in dry environments.
ISO 4035 (formerly DIN 439B) nuts are chamfered, so their edges are less sharp than DIN 936 nuts. This new ISO standard is functionally the same as the DIN standard it replaced, with slightly different tolerances for width.
For technical drawings and 3-D models, click on a part number.
Thread Size | Thread Pitch, mm | Wd. | Ht. | Specifications Met | Pkg. Qty. | Pkg. | |
Black-Oxide Steel—Class 04 | |||||||
---|---|---|---|---|---|---|---|
M3 | 0.5 | 5.5mm | 1.8mm | ASTM A108, DIN 439B, ISO 4035 | 1 | 000000000 | 00000 |
M5 | 0.5 | 8mm | 2.7mm | ASTM A108, DIN 439B, ISO 4035 | 1 | 000000000 | 0000 |
M5 | 0.8 | 8mm | 2.7mm | ASTM A108, DIN 439B, ISO 4035 | 1 | 000000000 | 0000 |
M6 | 0.75 | 10mm | 3.2mm | ASTM A108, DIN 439B, ISO 4035 | 1 | 000000000 | 0000 |
M8 | 1 | 13mm | 4mm | ASTM A108, DIN 439B, ISO 4035 | 1 | 000000000 | 0000 |
M8 | 1.25 | 13mm | 4mm | ASTM A108, DIN 439B, ISO 4035 | 1 | 000000000 | 0000 |
M10 | 1 | 17mm | 5mm | ASTM A108, DIN 439B, ISO 4035 | 1 | 000000000 | 0000 |
M10 | 1.5 | 17mm | 5mm | ASTM A108, DIN 439B, ISO 4035 | 1 | 000000000 | 0000 |
M12 | 1.75 | 19mm | 6mm | ASTM A108, DIN 439B, ISO 4035 | 1 | 000000000 | 0000 |
M14 | 1.5 | 22mm | 7mm | ASTM A108, DIN 439B, ISO 4035 | 1 | 000000000 | 0000 |
M16 | 1.5 | 24mm | 8mm | ASTM A108, DIN 439B, ISO 4035 | 1 | 000000000 | 0000 |
M16 | 2 | 24mm | 8mm | ASTM A108, DIN 439B, ISO 4035 | 1 | 000000000 | 0000 |
M18 | 1.5 | 27mm | 9mm | ASTM A108, DIN 439B, ISO 4035 | 1 | 000000000 | 0000 |
M18 | 2.5 | 27mm | 9mm | ASTM A108, DIN 439B, ISO 4035 | 1 | 000000000 | 0000 |
M20 | 1.5 | 30mm | 10mm | ASTM A108, DIN 439B, ISO 4035 | 1 | 000000000 | 00000 |
M20 | 2.5 | 30mm | 10mm | ASTM A108, DIN 439B, ISO 4035 | 1 | 000000000 | 00000 |
M22 | 1.5 | 32mm | 11mm | ASTM A108, DIN 439B, ISO 4035 | 1 | 000000000 | 00000 |
M22 | 2.5 | 32mm | 11mm | ASTM A108, DIN 439B, ISO 4035 | 1 | 000000000 | 00000 |
M24 | 1.5 | 36mm | 12mm | ASTM A108, DIN 439B, ISO 4035 | 1 | 000000000 | 00000 |
M27 | 1.5 | 41mm | 13.5mm | ASTM A108, DIN 439B, ISO 4035 | 1 | 000000000 | 00000 |
M27 | 2 | 41mm | 13.5mm | ASTM A108, DIN 439B, ISO 4035 | 1 | 000000000 | 00000 |
M30 | 1.5 | 46mm | 15mm | ASTM A108, DIN 439B, ISO 4035 | 1 | 000000000 | 00000 |
M30 | 2 | 46mm | 15mm | ASTM A108, DIN 439B, ISO 4035 | 1 | 000000000 | 00000 |
M30 | 3.5 | 46mm | 15mm | ASTM A108, DIN 439B, ISO 4035 | 1 | 000000000 | 00000 |
M33 | 3.5 | 50mm | 16.5mm | ASTM A108, DIN 439B, ISO 4035 | 1 | 000000000 | 00000 |
Metric Low-Strength Steel Thin Square Nuts

About half the strength and two-thirds the height of medium-strength steel square nuts, use these metric nuts in light duty, low-clearance applications. Also known as square jam nuts, they’re commonly jammed together to hold each other in place. Their flat, broad sides make them easy to grip with a wrench and keep them from rotating in channels and square holes. Compared to hex nuts, a greater area is in contact with the fastened surface. A zinc plating protects these nuts from corrosion in wet environments.
These nuts meet DIN 562, an international standard that signifies their material and dimensions are compatible with other products and tools.
For technical drawings and 3-D models, click on a part number.