OmniSynk Distribution Services

51B221-8

Screw, Close Tolerance

Part number
51B221-8
NSN
5305-00-802-4669
NIIN
00-802-4669
Item name
Screw, Close Tolerance
Manufacturer
Alcoa Global Fasteners Inc.
CAGE code
06950
FSC
5305
Unit of issue
EA
DEMIL code
A

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Technical characteristics

Thread Class
3A
Thread Direction
Right-hand
Thread Length
0.276 inches minimum
Fastener Length
0.761 inches minimum and 0.808 inches maximum
Head Style
Modified pan
Head Diameter
0.361 inches minimum and 0.381 inches maximum
Head Height
0.103 inches minimum and 0.118 inches maximum
Grip Diameter
0.1885 inches minimum and 0.1895 inches maximum
Internal Drive Style
Offset cruciform (torque set)
Nominal Thread Diameter
0.190 inches
Grip Length
0.485 inches minimum and 0.515 inches maximum
Thread Quantity per Inch
32
Minimum Tensile Strength
180000 pounds per square inch
Surface Finish
32.0 microinches grip
Material
Steel comp 4140 overall or steel comp E4340 overall or steel comp 6150 overall or steel comp 8735 overall or steel comp 8740 overall
Material Document and Classification
MIL-S-5626 mil spec 1ST material response overall or MIL-S-5000 mil spec 2ND material response overall or MIL-S-8503 mil spec 3RD material response overall or MIL-S-6098 mil spec 4TH material response overall or MIL-S-6049 mil spec 5TH material response overall
Surface Treatment
Cadmium overall and chromate overall
Surface Treatment Document and Classification
QQ-P-416, ty 2, cl 3 fed spec single treatment response overall
Thread Series Designator
UNF
Catalogue data is compiled from public DLA/FLIS sources and is provided for identification. Availability, condition and certification are confirmed on quotation. OmniSynk Distribution Services is a stocking distributor.

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