screws › close tolerance screws
NAS1581C4T12
Close Tolerance Screw
Description
Fastener Length: 1-5/32", Thread: 1/4-28, Thread Length: 3/8"
Specifications
| Countersink Angle | 99.0 degrees minimum and 101.0 degrees maximum |
|---|---|
| Country of Origin | USA |
| Fastener Length | 1.138 inches minimum and 1.168 inches maximum |
| Grip Diameter | 0.2485 inches minimum and 0.2495 inches maximum |
| Grip Length | 0.74 inches minimum and 0.76 inches maximum |
| Head Diameter | 0.3504 inches minimum and 0.3988 inches maximum |
| Head Style | Flat countersunk |
| Internal Drive Style | Offset cruciform (torque set) |
| Length | 1 5/32 |
| Material | Steel |
| Material Specification | Cres 286 conform to ams5731,ams5732,ams5737 or ams5853 national std/spec single material response |
| Min. Tensile Strength (psi) | 3700 pounds per square inch |
| NIIN | 01-603-8744 |
| NSN | 5305-01-603-8744 |
| Part Name Assigned By Controlling Agency | Bolt,shear,100 deg flush reduced head,offset cruciform,offset cruciform-ribbed & dt slot,95 ksi fsu |
| Surface Treatment | Passivate |
| Surface Treatment Specification | Passivate iaw ams2700 method 1,type 2 or 8,class 1 national std/spec single treatment response |
| Thread Class | 3a |
| Thread Diameter | 0.250 |
| Thread Direction | Right-hand |
| Thread Length | 0.403 |
| Thread Qty | 28 |
| Thread Qty Per Inch (tpi) | 28 |
| Thread Series Designator | UNJF |
| Thread Size | 1/4 |
| Weight | 0.015 lb |
Other sizes
Parts that share this base number, ordered by size. Always verify the full specification before substituting.
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.
- NAS1581F4T12 NAS 1/4-28 · 0.073 in · Flat countersunk · Steel
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Catalog data updated 2026-07-05. Report a data error