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Ball Ø 0.687 / 5/16-24-2BQD315 is an inch quick-release ball joint with a 5/16-24-2B female socket and a 5/16-24-2A male stud. A stainless steel internal spring enables fast disconnect and reconnect without tools. Pin diameter A = 0.156 in., spring clearance C = 0.094 in., housing flange F = 0.531 in., ball housing G = 0.687 in., journal J = 0.437 in., body length L = 0.625 in., overall length M = 1.453 in., height N = 1.125 in., body width P = 0.605 in.
The QD series uses a carbon steel 1045 housing, a carbon steel 1045 ball stud, a carbon steel 1020 shell, and a stainless steel spring. Silver or yellow zinc plating is standard. The quick-disconnect feature suits applications where linkage arms are frequently detached for adjustment, maintenance, or seasonal service — including throttle linkages, agricultural implement controls, and OEM assemblies with regular field service.
Aluminum version available with ‘A’ prefix (e.g., AQD315). Left-hand thread version available by adding ‘LH’ suffix. Yellow zinc plating available on request. Internal-spring variant is the QI series.
All available sizes in the QD Series Quick Disconnect Ball Joint – Inner Spring series. Can’t find your size? Contact us for custom dimensions.
| PART NO. | D1 | D2 | A | C | F | G | J | L | M | N | P |
|---|---|---|---|---|---|---|---|---|---|---|---|
| QD187 | 10-32-2B | 10-32-2A | 0.125 | 0.063 | 0.438 | 0.438 | 0.313 | 0.438 | 1.094 | 0.906 | 0.438 |
| QD250 | 1/4-28-2B | 1/4-28-2A | 0.125 | 0.063 | 0.469 | 0.562 | 0.375 | 0.562 | 1.250 | 0.969 | 0.531 |
| QD315 | 5/16-24-2B | 5/16-24-2A | 0.156 | 0.094 | 0.531 | 0.687 | 0.437 | 0.625 | 1.453 | 1.125 | 0.605 |
| QD375 | 3/8-24-2B | 3/8-24-2A | 0.187 | 0.094 | 0.687 | 0.875 | 0.500 | 0.750 | 1.750 | 1.375 | 0.812 |
| QD500 | 1/2-20-2B | 1/2-20-2A | 0.250 | 0.094 | 0.875 | 1.125 | 0.625 | 1.000 | 2.530 | 2.030 | 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.
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The QD315 is an inch quick-release ball joint with a 5/16-24-2B female socket and a 5/16-24-2A male stud, built around a 0.687 in. ball. A stainless steel internal spring lets it disconnect and reconnect without tools, which suits throttle linkages, agricultural implement controls, and OEM assemblies that need frequent field service or seasonal disassembly.
Pin diameter (A) is 0.156 in., housing flange (F) is 0.531 in., ball housing (G) is 0.687 in., journal (J) is 0.437 in., body length (L) is 0.625 in., overall length (M) is 1.453 in., height (N) is 1.125 in., and body width (P) is 0.605 in.
The housing is Carbon Steel 1045, the ball stud is Carbon Steel 1045, the shell is Carbon Steel 1020, and the internal spring is Stainless Steel Spring. Standard surface finish is silver or yellow zinc plated.
A stainless steel internal spring lets the 5/16-24-2B socket and 5/16-24-2A stud snap apart and reconnect without tools, so linkage arms can be pulled for adjustment, maintenance, or seasonal service. SYZ also lists a QI series as the internal-spring variant of this ball joint family, so confirm with SYZ which spring configuration a given part number ships with if you need a specific one.
Yes. An aluminum version is available with an 'A' prefix (e.g. AQD315), and a left-hand thread version is available by adding an 'LH' suffix. Yellow zinc plating is available on request in place of the standard silver/yellow zinc finish.
Confirm thread hand (standard vs. LH suffix), body material (steel vs. aluminum 'A' prefix), and plating color (silver vs. yellow zinc), since the 5/16-24-2B/5/16-24-2A thread pair and 0.687 in. ball size are fixed for this part number.
