screws › close tolerance screws
NAS1154-27
Close Tolerance Screw
Description
flat head
Specifications
| Countersink Angle | Between 99 degrees and 101 degrees |
|---|---|
| Distance From Head Largest Bearing Surface To Shank Hole Center | 1.863 inches first hole and 1.903 inches first hole |
| Fastener Length | Between 1.989 inches and 2.019 inches |
| Grip Diameter | Between 0.2485 inches and 0.2495 inches |
| Grip Length | Between 1.678 inches and 1.698 inches |
| Hardness Rating | 36.0 rockwell c and 40.0 rockwell c |
| Head Diameter | Between 0.449 inches and 0.507 inches |
| Head Style | Flat countersunk |
| Internal Drive Style | Offset cruciform (torque set) |
| Material | Steel |
| Min. Tensile Strength (psi) | 160000 pounds per square inch |
| Shank Unthreaded Hole Diameter | 0.076 inches first hole and 0.086 inches first hole |
| Specification Data | 80205-nas1154 professional/industrial association standard |
| Surface Finish | 32 microinches bearing surface of head, 32.0 microinches threads |
| Surface Treatment | Cadmium and chromate |
| Surface Treatment Specification | Cl2 federal specification single treatment response ty2 qq-p-416 |
| Thread Class | 3a |
| Thread Diameter | 0.25 |
| Thread Direction | Right-hand |
| Thread Length | Between 0.291 inches and 0.341 inches |
| Thread Qty | 28 |
| Thread Qty Per Inch (tpi) | 28 |
| Thread Series | UNJF |
| Thread Series Designator | Unjf (fine thread with external controlled root radius) |
Cross-reference
No interchangeable or dimensionally similar parts are on record for NAS1154-27. Try the cross-reference lookup to search by a different part number.
Catalog data updated 2026-07-05. Report a data error