Description
Jam Nut / Lock Nut Manufacturer & Supplier
MKM Fasteners offers premium-quality Jam Nuts / Lock Nuts designed for precision fastening applications that demand reliability and strength. These nuts are thinner than standard hex nuts and are typically used as a secondary nut to lock a primary nut in place, preventing loosening due to vibration or dynamic loads.
Our Jam Nuts are manufactured in compliance with DIN 439 and ANSI B18.2.2 dimensional standards and meet ISO 3506-2 and ASTM F 594 mechanical standards, ensuring high performance in both metric and inch sizes. They are available in SS 304 / SS 304L (A2 grades) and SS 316 / SS 316L (A4 grades)—ideal for general and corrosive environments such as marine, chemical, or outdoor installations.
These nuts come with proof stress ratings ranging from 250 MPa to 350 MPa for metric threads and 85 ksi to 100 ksi for inch threads, making them suitable for light to moderate load-bearing applications.
Specifications:
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Thread Types: Metric & Inch
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Material: SS 304 / SS 304L (A2), SS 316 / SS 316L (A4)
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Size Range: M5 to M12 & 1/4″ to 1/2″
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Marking Grades: A2-025, A2-035, A4-025, A4-035 (Metric)
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ASTM Grades: F594 C, D, G, H (Inch)
MKM Fasteners ensures every Jam Nut / Lock Nut is tested for quality and performance, providing secure and vibration-resistant connections in demanding environments. Whether used in machinery, construction, or automotive systems, our lock nuts provide lasting reliability and corrosion resistance.
Choose MKM Fasteners – your trusted source for durable and standardized stainless steel fastening solutions.
JAM NUT / LOCK NUT
| THREAD TYPE | DIMENSIONAL STANDARD | MECHANICAL STANDARD | MARKING | PROOF STRESS | MATERIAL | SIZE RANGE |
|---|---|---|---|---|---|---|
| METRIC | DIN 439 | ISO 3506 -2 | A2-025 | Min 250 Mpa | SS 304 / SS 304L | Range: M5-M12 & 1/4″ to 1/2″ |
| A2-035 | Min 350 Mpa | |||||
| A4-025 | Min 250 Mpa | SS 316 / SS 316L | ||||
| A4-035 | Min 350 Mpa | |||||
| INCHES | ANSI B18.2.2 | ASTM F 594 | F594 C | Min 100 ksi | SS 304 / SS 304L | |
| F594 D | Min 85 ksi | |||||
| F594 G | Min 100 ksi | SS 316 / SS 316L | ||||
| F594 H | Min 85 ksi |



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