Thread Locking for Adjustable Linkages
Jam nuts lock a threaded rod end, adjuster, or tube adapter after the desired length or alignment has been set. Use sufficient thread engagement and the correct tightening method for the assembly.
JAM NUTS
• Material: Carbon steel (zinc plated).
• Identification: Left hand jam nuts marked with groove or yellow zinc plated.
• Aluminum Option: Use "a" instead of "s" as suffix (e.g., jnr8a).
ISO 9001 Certified
SGS Verified
OEM / ODM Ready
0
SKUs in this series
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Primary size range
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Secondary size range
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Ask for Custom SupportProduct Definition
What Is JAM NUTS?
JAM NUTS are locking nuts used to secure the setting of threaded rod ends, tube adapters, adjusters, studs, and linkage components after the desired length or alignment has been established. They are small but important parts of an adjustable connection. Match thread size and direction, maintain sufficient engagement, and use an appropriate tightening and inspection method for the operating environment.
Typical Applications
Applications for JAM NUTS
Steering and Suspension Service
They are common in adjustable tie rods, control arms, and linkage assemblies where service technicians need to preserve a measured setting. Keep the locking interface accessible for inspection and maintenance.
Machine and Fixture Adjustment
Jam nuts can secure actuator links, fixture screws, and fabricated machine controls against vibration. Match thread size, material, and surface treatment to the mating hardware and operating environment.
Agricultural Hardware
Applied in rugged agricultural linkage hardware where repeat locking and adjustment are required.
OEM Assemblies
Used in repeat OEM threaded hardware programs that require zinc-plated locking nuts or optional aluminum alternatives.
Custom Fabrication
A practical choice for custom fabrication where RH and LH jam nuts are needed for adjustment and secure lock-down.
Product FAQ
Frequently Asked Questions
What are jam nuts used for?
Jam nuts are used to lock threaded assemblies in position after adjustment, especially on rod ends, tube adapters, and fabricated linkage hardware.
What material is used in this series?
This series uses carbon steel with zinc plating as standard. Aluminum versions are also available for select part numbers.
How are left-hand jam nuts identified?
Left-hand jam nuts are identified by groove or yellow zinc plating, as noted in the specification guide.
Is an aluminum option available?
Yes. Use an A suffix instead of S to specify the aluminum option, for example JNR8A.
Are metric sizes available?
Yes. Metric sizes are available on request even though the main size chart here lists standard inch UNF sizes.
How do I choose the correct jam nut?
Select by thread size first, then verify the H MAX, H MIN, and wrench dimensions required by the target assembly.