1-12JNR16S-2 JNL16S-2 Jam Nut
JAM NUTS Product Overview
JNR16S-2 / JNL16S-2 is a 1-12 jam nut (also called a lock nut or half nut) with hex width (W max) = 0.575″ and height (H max) = 1.5″.
Used to lock rod end position on a threaded shank after the rod end has been adjusted. Thread the rod end to the desired position, then spin the jam nut against the end fitting or tube adapter to prevent back-off under vibration. Carbon steel, zinc plated (silver). Left-hand jam nuts (JNL prefix) are yellow zinc plated for visual identification. Anodized aluminum option available (substitute ‘A’ for ‘S’ in suffix).
Left-hand version: JNL16S-2. Aluminum anodized version available (e.g., JNR16S-2A). Sold individually. Metric jam nut sizes available on request.
JAM NUTS Series — Full Size Range
All available sizes in the JAM NUTS series. Can’t find your size? Contact us for custom dimensions.
| Right Hand | Left Hand | Threads UNF-2B | H MAX | H MIN | W MAX | W MIN |
|---|---|---|---|---|---|---|
| JNR3S | JNL3S | 10-32 | 0.375 | 0.364 | 0.139 | 0.127 |
| JNR4S | JNL4S | 1/4-28 | 0.438 | 0.428 | 0.163 | 0.150 |
| JNR5S | JNL5S | 5/16-24 | 0.500 | 0.489 | 0.195 | 0.180 |
| JNR6S | JNL6S | 3/8-24 | 0.562 | 0.551 | 0.227 | 0.210 |
| JNR7S | JNL7S | 7/16-20 | 0.688 | 0.675 | 0.260 | 0.240 |
| JNR8S | JNL8S | 1/2-20 | 0.750 | 0.736 | 0.323 | 0.302 |
| JNR10S | JNL10S | 5/8-18 | 0.938 | 0.922 | 0.387 | 0.363 |
| JNR10S-1 | JNL10S-1 | 5/8-18 | 0.750 | 0.736 | 0.387 | 0.363 |
| JNR12S | JNL12S | 3/4-16 | 1.125 | 1.088 | 0.446 | 0.398 |
| JNR14S | JNL14S | 7/8-14 | 1.312 | 1.269 | 0.510 | 0.458 |
| JNR16S | JNL16S | 1 1/4-12 | 1.875 | 1.625 | 0.575 | 0.530 |
| JNR16S-1 | JNL16S-1 | 1-14 | 1.500 | 1.450 | 0.575 | 0.519 |
| JNR16S-2 | JNL16S-2 | 1-12 | 1.500 | 1.450 | 0.575 | 0.519 |
Every Unit Inspected Before Shipment
Raw Material Inspection
Material certifications verified. Composition confirmed by spectrometer before machining begins.
Thread Gauge Inspection
100% go/no-go gauge check on all threaded sections. Zero tolerance on dimensional non-conformance.
Load Capacity Test
Static and dynamic load tests run on representative samples from each production batch.
Dimensional Measurement
CMM verification of critical dimensions — ball diameter, bore, thread pitch, and body length.
Surface Inspection
Visual and tactile inspection for burrs, scratches, surface cracks, and plating defects.
Articulation Test
Misalignment angle and torque measured to confirm liner performance meets specification.
Heat Treatment Verify
Hardness tests confirm proper heat treatment on chromoly steel bodies and bearing balls.
Batch Documentation
Full traceability from raw material heat number to finished part. COC and inspection reports available.
Where JAM NUTS Are Used
More from the JAM NUTS Series
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JAM NUTS 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.