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.
1-12RELATED PRODUCT
JNR16S-2 JNL16S-2 Jam Nut
Part No.: JNR16S-2
· Thread-adjustment and fabrication hardware series
✓ ISO 9001 Certified
✓ SGS Verified
✓ 26+ Years Factory
✓ OEM / ODM Ready
Threads 1-12
H MAX 1.500 in.
H MIN 1.450 in.
Carbon steel zinc plated standard
LH nuts marked by groove or yellow zinc
Aluminum option available with A suffix
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).
⚡ Typically responds within 24 hours
MOQ:50 pcs / model
Lead Time:7–15 days
Sample:Free (excl. freight)
Payment:T/T · PayPal · L/C
Overview
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.
Size Chart
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 |
Quality Control
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.
Applications
Where JAM NUTS Are Used
Related Products
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FAQ
JAM NUTS Frequently Asked Questions
What is the JNR16S-2/JNL16S-2 jam nut used for?
The JNR16S-2/JNL16S-2 is a 1-12 jam nut (also called a lock nut or half nut), used to lock a rod end's position on a threaded shank — thread the rod end to the desired position, then spin the jam nut against the end fitting or tube adapter to keep it from backing off under vibration.
What are the thread size and height dimensions of the JNR16S-2/JNL16S-2 jam nut?
Thread is 1-12, hex width (W max) is 0.575 in, and height runs from H min 1.450 in up to H max 1.500 in.
What material is the JNR16S-2/JNL16S-2 jam nut made from, and how do I tell RH from LH by sight?
Standard construction is carbon steel, zinc plated to a silver finish. The left-hand nut, JNL16S-2, is yellow zinc plated instead, so it can be told apart from the silver right-hand JNR16S-2 at a glance on the shop floor.
What's the difference between JNR16S-2 and JNL16S-2?
JNR16S-2 is the right-hand thread version and JNL16S-2 is the left-hand thread version of the same 1-12 jam nut — order the pair that matches the thread hand on each end of your rod end or tube adapter.
Is an aluminum version of the JNR16S-2/JNL16S-2 jam nut available?
Yes. Substitute "A" for "S" in the suffix (e.g. JNR16S-2A) for an anodized aluminum version instead of the standard zinc-plated carbon steel.
Can I get the JNR16S-2/JNL16S-2 jam nut in a metric thread, and how is it sold?
This size is 1-12; metric jam nut sizes are available on request. Jam nuts are sold individually, so order the exact quantity of RH/LH nuts needed for each linkage assembly.