screws › socket head cap screws
MS24678-21
Hexagon Socket Drilled Cap Screw
Description
Fastener Length: 5/8", Hole Diameter: 3/64", Thread: 1/4-28, Head Width: 3/16", Thread Length: 5/8"
Specifications
| Fastener Length | 0.595 inches minimum and 0.625 inches maximum |
|---|---|
| Finish | Plain |
| Hardness Rating | 38.0 rockwell c minimum and 45.0 rockwell c maximum |
| Head Diameter | 0.365 inches minimum and 0.375 inches maximum |
| Head Height | 0.244 inches minimum and 0.250 inches maximum |
| Head Style | Flat chamfer |
| Hole Configuration Style | Round internal hexagon |
| Hole Diameter | 0.047 |
| Hole Quantity | 3 |
| Hole Type | Drilled |
| Internal Drive Style | Hexagon |
| Length | 5/8 |
| Material | Steel |
| Min. Tensile Strength (psi) | 170000 pounds per square inch |
| Minimum Yield Strength | 150000 pounds per square inch |
| Nondefinitive Specification/Std Data | 6 type |
| Size | 1/4-28 |
| Surface Treatment | Cadmium and chromate |
| Surface Treatment Specification | Qq-p-416 ty 2 cl 3 fed spec single treatment response |
| Thread Class | 3a |
| Thread Diameter | 0.250 |
| Thread Direction | Right-hand |
| Thread Length | 0.524 inches minimum and 0.625 inches maximum |
| Thread Qty | 28 |
| Thread Qty Per Inch (tpi) | 28 |
| Thread Series Designator | UNF |
| Thread Size | 1/4 |
| Thread Type | N.F. - Fine |
| Width Across Flats | 0.1875 inches minimum and 0.1900 inches maximum |
Other sizes
Parts that share this base number, ordered by size. Always verify the full specification before substituting.
Cross-reference
Interchangeable
Parts that share a National Stock Number or are listed as an alternate for MS24678-21 — functionally equivalent.
- NAS1351-4H10P Listed alternate 28.00-28 · 5/8 in · Flat chamfer · Steel
Similar parts
Parts with matching key dimensions — often from a different standards family. Candidates for comparison only; verify the full specification before substituting.
- NAS1351N4H10 NAS 1/4-28 · 5/8 in · Flat chamfer · Iron
- NAS1351N4H10S NAS 1/4-28 · 5/8 in · Flat chamfer · Iron
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Catalog data updated 2026-07-05. Report a data error