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JAM NUT / LOCK NUT

  • Category: Thin Nuts / Locking Fasteners
  • Material: Stainless Steel 304 / 304L, Stainless Steel 316 / 316L
  • Size Range: M5 to M12 | ¼″ to ½″
  • Thread Type: Metric & Inch (UNC/UNF)
  • Dimensional Standards: Metric: DIN 439, Inch: ANSI B18.2.2
  • Marking: As per ISO 3506-2 / ASTM F594
  • Proof Stress: 250–350 MPa (Metric) | 85–100 ksi (Inch)
Categories: , Product ID: 6754

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:

  • Thread Types: Metric & Inch

  • Material: SS 304 / SS 304L (A2), SS 316 / SS 316L (A4)

  • Size Range: M5 to M12 & 1/4″ to 1/2″

  • Marking Grades: A2-025, A2-035, A4-025, A4-035 (Metric)

  • 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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