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related-product-inchJSI-7-37 / JSX-7-37 is a male-male inch jack screw adjuster with 7/16-20 threads at both ends. Thread length = 1.375″, hex size = 0.688″ across flats, total length = 3.688″, hex height = 0.438″.
The JSI (carbon steel, zinc plated) and JSX (4130 chromoly steel) jack screws thread into rod end bodies at both ends with a central hex for length adjustment. One end has right-hand thread; the other is left-hand — turning the hex extends or shortens the assembly without removing either end. Used in toe links, push rods, throttle rods, and any linkage requiring fine-increment length adjustment without disassembly.
Carbon steel version: JSI-7-37. 4130 chromoly version: JSX-7-37. Special lengths and thread combinations available in volume. Metric equivalent is the JSIM series.
All available sizes in the JACK SCREW JSI series. Can’t find your size? Contact us for custom dimensions.
| Carbon Steel | Chromoly Steel | Thread Right/Left | Thread Length | Hex Size | Total Length | Hex Height |
|---|---|---|---|---|---|---|
| JSI-3-14 | JSX-3-14 | 10-32 | 0.563 | 0.313 | 1.402 | 0.156 |
| JSI-3-19 | JSX-3-19 | 10-32 | 0.750 | 0.375 | 1.940 | 0.190 |
| JSI-4-18 | JSX-4-18 | 1/4-28 | 0.750 | 0.438 | 1.776 | 0.156 |
| JSI-4-26 | JSX-4-26 | 1/4-28 | 1.000 | 0.438 | 2.550 | 0.250 |
| JSI-5-23 | JSX-5-23 | 5/16-18 | 1.000 | 0.500 | 2.309 | 0.189 |
| JSI-5-27 | JSX-5-27 | 5/16-18 | 1.000 | 0.500 | 2.673 | 0.313 |
| JSI-6-21 | JSX-6-21 | 3/8-24 | 0.868 | 0.563 | 2.125 | 0.219 |
| JSI-6-26 | JSX-6-26 | 3/8-24 | 1.125 | 0.563 | 2.589 | 0.219 |
| JSI-6-27 | JSX-6-27 | 3/8-24 | 1.100 | 0.563 | 2.680 | 0.219 |
| JSI-6-33 | JSX-6-33 | 3/8-24 | 1.250 | 0.563 | 3.250 | 0.375 |
| JSI-7-29 | JSX-7-29 | 7/16-20 | 1.250 | 0.563 | 2.870 | 0.250 |
| JSI-7-37 | JSX-7-37 | 7/16-20 | 1.375 | 0.688 | 3.688 | 0.438 |
| JSI-8-29 | JSX-8-29 | 1/2-20 | 1.252 | 0.750 | 2.938 | 0.313 |
| JSI-8-34 | JSX-8-34 | 1/2-20 | 1.500 | 0.750 | 3.433 | 0.313 |
| JSI-8-40 | JSX-8-40 | 1/2-20 | 1.500 | 0.750 | 4.000 | 0.500 |
| JSI-10-37 | JSX-10-37 | 5/8-18 | 1.625 | 0.750 | 3.745 | 0.375 |
| JSI-10-41 | JSX-10-41 | 5/8-18 | 1.750 | 0.750 | 4.075 | 0.375 |
| JSI-10-50 | JSX-10-50 | 5/8-18 | 1.875 | 0.938 | 4.985 | 0.625 |
| JSI-12-40 | JSX-12-40 | 3/4-16 | 1.750 | 0.875 | 4.042 | 0.422 |
| JSI-12-46 | JSX-12-46 | 3/4-16 | 2.000 | 0.875 | 4.638 | 0.422 |
| JSI-12-55 | JSX-12-55 | 3/4-16 | 2.250 | 1.125 | 5.500 | 0.500 |
| JSI-12-60 | JSX-12-60 | 3/4-16 | 2.250 | 1.125 | 6.000 | 0.750 |
| JSI-12-65 | JSX-12-65 | 3/4-16 | 2.250 | 1.125 | 6.500 | 1.250 |
| JSI-12-75 | JSX-12-75 | 3/4-16 | 2.250 | 1.125 | 7.500 | 2.250 |
| JSI-12-86 | JSX-12-86 | 3/4-16 | 4.000 | 0.875 | 8.638 | 0.422 |
| JSI-14-66 | JSX-14-66 | 7/8-14 | 2.375 | 1.313 | 6.625 | 0.875 |
| JSI-16-80 | JSX-16-80 | 1 1/4-12 | 2.875 | 1.875 | 8.000 | 1.000 |
| JSI-16-1-80 | JSX-16-1-80 | 1-14 | 2.875 | 1.500 | 8.000 | 1.000 |
| JSI-16-2-58 | JSX-16-2-58 | 1-12 | 2.500 | 1.500 | 5.750 | 0.750 |
| JSI-16-2-80 | JSX-16-2-80 | 1-12 | 2.875 | 1.500 | 8.000 | 1.000 |
Material certifications verified. Composition confirmed by spectrometer before machining begins.
100% go/no-go gauge check on all threaded sections. Zero tolerance on dimensional non-conformance.
Static and dynamic load tests run on representative samples from each production batch.
CMM verification of critical dimensions — ball diameter, bore, thread pitch, and body length.
Visual and tactile inspection for burrs, scratches, surface cracks, and plating defects.
Misalignment angle and torque measured to confirm liner performance meets specification.
Hardness tests confirm proper heat treatment on chromoly steel bodies and bearing balls.
Full traceability from raw material heat number to finished part. COC and inspection reports available.
Share your part number, required quantity, and any special material or packaging requirements. We respond within 24 hours.
The JSI-7-37/JSX-7-37 is a male-male inch jack screw adjuster with 7/16-20 threads at both ends, used in toe links, push rods, throttle rods, and other linkage assemblies that need fine-increment length adjustment without disassembly.
Yes, both ends are threaded 7/16-20, but one end is right-hand and the other is left-hand — turning the central hex extends or shortens the assembly without unthreading either end, the same way a turnbuckle works.
Thread length is 1.375 in per end, hex size is 0.688 in across flats, hex height is 0.438 in, and overall total length is 3.688 in.
The JSI-7-37 is carbon steel, zinc plated, and the JSX-7-37 is 4130 chromoly steel — same dimensions, two base-material options for this size.
Thread the mating rod ends into the JSI-7-37/JSX-7-37 until you're close to your target length, then rotate the central hex — because one end is right-hand and the other left-hand, this draws both rod ends in or pushes them out together without unthreading either side.
Yes. The JSIM series is the metric equivalent of this inch jack screw, and SYZ can produce special lengths and thread combinations in volume — confirm your target thread size and total length when requesting a quote.
