MS9557-21

Military Standard Machine Bolt

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Description:

Fastener Length: 1-7/16", Thread: 1/4-28, Thread Length: 13/16",

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MS9557-21 Datasheet Features and Specification

Thread Class:

Thread Direction:

Right-hand

Thread Length:

0.740 inches minimum and 0.820 inches maximum

Fastener Length:

1.428 inches minimum and 1.448 inches maximum

Head Style:

Double hexagon w/hole

Head Height:

0.290 inches minimum and 0.310 inches maximum

Width Between Flats:

0.313 inches nominal

Extended Washer Diameter:

0.428 inches minimum and 0.448 inches maximum

Extended Washer Thickness:

0.060 inches minimum

Thread Diameter:

0.250 inches

Grip Length:

0.628 inches minimum and 0.688 inches maximum

Features Provided:

Finished head

Thready Qty Per Inch (tpi):

Min. Tensile Strength (psi):

130000 pounds per square inch

Hardness Rating:

24.0 rockwell c minimum overall and 35.0 rockwell c maximum overall

Minimum Yield Strength:

85000 pounds per square inch

Surface Finish:

32.0 microinches bearing surface of head

Surface Finish:

32.0 microinches grip

Surface Finish:

32.0 microinches threads

Material:

Iron alloy 660 overall

Material Specification:

Ams 5731 assn std single material response overall

Thread Series Designator:

Unjf

Quick Specs

Thread Size	1/4
Thread Qty	28
Material	Iron
Length	1-7/16

Additional Information

SKU / Model:	MS955721
NSN:	5306-01-288-9338
FSC:	Bolts / 5306
Product Series:	MS9557
Pack Weight (Approx.)	0.131 lb
Minimum Qty (MOQ):	5
ECCN:	EAR99
National Motor Freight:	093486, Bolts,nuts Or Screws, Noi (sub 3)
Download PDF Version MS9557-21_Military-Fasteners-com.pdf