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MS27039-4-28
Military Standard Machine Screw
Description
Fastener Length: 1-13/16", Thread: 1/4-28, Thread Length: 37/64", MS27039 series screw
Specifications
| Fastener Length | 1.766 inches minimum and 1.813 inches maximum |
|---|---|
| Hardness Rating | 26.0 rockwell c minimum and 32.0 rockwell c maximum |
| Head Diameter | 0.473 inches minimum and 0.492 inches maximum |
| Head Height | 0.162 inches minimum and 0.175 inches maximum |
| Head Style | Pan Head |
| Internal Drive Style | Cross recess type 1 |
| Length | 1 13/16 |
| Material | Steel |
| Min. Tensile Strength (psi) | 125000 pounds per square inch |
| Screw Material | Steel comp 4037 or steel comp 8630 |
| Screw Material Specification | Ams 6300 assn std 1st material response or mil-s-6050 mil spec 2nd material response |
| Screw Surface Treatment | Cadmium and chromate |
| Screw Surface Treatment Specification | Qq-p-416,type 2,class 3 fed spec single treatment response |
| Thread Class | 3a |
| Thread Diameter | 0.250 |
| Thread Direction | Right-hand |
| Thread Length | 0.501 inches minimum and 0.578 inches maximum |
| Thread Qty | 28 |
| Thread Qty Per Inch (tpi) | 28 |
| Thread Series Designator | UNF |
| Thread Size | 1/4 |
Cross-reference
Similar parts
Parts with matching key dimensions — often from a different standards family. Candidates for comparison only; verify the full specification before substituting.
- MS27039-4-17 MS 1/4-28 · 0.073 in · Pan Head · Steel
- MS27039-4-23 MS 1/4-28 · 0.073 in · Pan Head · Steel
- MS27039-4-24 MS 1/4-28 · 0.073 in · Pan Head · Steel
- MS27039-4-27 MS 1/4-28 · 0.073 in · Pan Head · Steel
- MS27039-4-30 MS 1/4-28 · 0.073 in · Pan Head · Steel
- MS27039C4-28 MS 1/4-28 · 0.073 in · Pan Head · Iron
- MS27039DD4-24 MS 1/4-28 · 0.073 in · Pan Head · Aluminum
- MS27039DD4-27 MS 1/4-28 · 0.073 in · Pan Head · Aluminum
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Catalog data updated 2026-07-05. Report a data error