bolts › close tolerance bolts
NAS1993-4T
Close Tolerance Bolt
Description
Reduced Head Bolt
Specifications
| Countersink Angle | 99.0 degrees minimum and 101.0 degrees maximum |
|---|---|
| Country of Origin | USA |
| Fastener Length | 0.573 inches minimum and 0.603 inches maximum |
| Grip | 0.250 in |
| Grip Diameter | 0.1885 inches minimum and 0.1895 inches maximum |
| Grip Length | 0.240 inches minimum and 0.260 inches maximum |
| Hardness Rating | 39.0 rockwell c minimum and 43.0 rockwell c maximum |
| Head Angle | 100 º |
| Head Diameter | 0.252 inches minimum and 0.305 inches maximum |
| Head Height | 0.068 inches minimum and 0.078 inches maximum |
| Head Style | Flat countersunk undercut |
| Head Type | Reduced |
| Industry Standards/Certification | NAS1993 |
| Internal Drive Style | Offset cruciform (torque set) |
| Length | 0.588 in, 19/32 |
| Material | Steel |
| Material Specification | Mil-s-5000 mil spec 1st material response or mil-s-6049 mil spec 2nd material response or ams6322 mil spec 2nd material response |
| NIIN | 01-136-3544 |
| NSN | 5305-01-136-3544 |
| Specification Data | 80205-nas1993 professional/industrial association standard |
| Surface Treatment | Cadmium and chromate |
| Surface Treatment Specification | Qq-p-416,type 2 class 2 fed spec single treatment response |
| Thread Class | 3a |
| Thread Diameter | 0.190 |
| Thread Direction | Right-hand |
| Thread Length | 0.313 inches minimum and 0.363 inches maximum |
| Thread Qty | 32 |
| Thread Qty Per Inch (tpi) | 32 |
| Thread Series Designator | UNJF |
| Thread Size | 0.1900-32, 10 |
| Weight | 0.0044 lb |
Other sizes
Parts that share this base number, ordered by size. Always verify the full specification before substituting.
- NAS1993-3T
- NAS1993-4T
- NAS1993-5T
- NAS1993-7T
Cross-reference
No interchangeable or dimensionally similar parts are on record for NAS1993-4T. Try the cross-reference lookup to search by a different part number.
Catalog data updated 2026-07-05. Report a data error