screws › close tolerance screws
NAS8704-20
Close Tolerance Screw
Description
Fastener Length: 1-41/64", Thread: 1/4-28, Thread Length: 13/32
Specifications
| Countersink Angle | 100.0 degrees |
|---|---|
| Fastener Length | 1.624 inches minimum and 1.654 inches maximum |
| Grip Diameter | 0.2485 inches minimum and 0.2495 inches maximum |
| Grip Length | 1.240 inches minimum and 1.260 inches maximum |
| Head Diameter | 0.354 inches minimum and 0.399 inches maximum |
| Head Style | Flat countersunk |
| Internal Drive Style | High-torque |
| Length | 1 41/64 |
| Material | Iron |
| Specification Data | 81205-bacb30ll professional/industrial association standard |
| Surface Finish | 32.0 microinches grip, 32.0 microinches threads |
| Surface Treatment | Cadmium and chromate |
| 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 | 0.364 inches minimum and 0.414 inches maximum |
| Thread Qty | 28 |
| Thread Qty Per Inch (tpi) | 28 |
| Thread Series Designator | UNJF |
| Thread Size | 1/4 |
Other sizes
Parts that share this base number, ordered by size. Always verify the full specification before substituting.
- NAS8704-3
- NAS8704-4
- NAS8704-7
- NAS8704-12
- NAS8704-20
Cross-reference
No interchangeable or dimensionally similar parts are on record for NAS8704-20. Try the cross-reference lookup to search by a different part number.
Catalog data updated 2026-07-05. Report a data error