642AS0748

Screw

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Description:

Fastener Length: 43/64", Thread: 1/4-20, Head Width: 5/32", Thread Length: 31/64"

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642AS0748 Datasheet Features and Specification

Thread Class:
3a
Thread Direction:
Right-hand
Thread Length:
0.449 inches minimum and 0.489 inches maximum
Fastener Length:
0.636 inches minimum and 0.676 inches maximum
Head Style:
Flat countersunk undercut
Head Diameter:
0.4640 inches minimum and 0.5066 inches maximum
Head Height:
0.070 inches minimum and 0.073 inches maximum
Locking Feature:
Pellet threads
Internal Drive Style:
Hexagon
Thread Diameter:
0.250 inches
Width Across Flats:
0.1562 inches minimum and 0.1585 inches maximum
Thready Qty Per Inch (tpi):
20
Min. Tensile Strength (psi):
160000 pounds per square inch
Countersink Angle:
100.0 degrees nominal
Surface Finish:
32.0 microinches bearing surface of head
Surface Finish:
32.0 microinches grip
Surface Finish:
32.0 microinches threads
Special Features:
Furnished with one o ring
Material:
Iron alloy 660 overall
Material Specification:
Ams5732 assn std single material response overall or ams5737 assn std single material response overall
Surface Treatment:
Passivate overall
Surface Treatment Specification:
Qq-p-35,ty 1,ty 2,ty 3 or ty 6 fed spec single treatment response overall
Thread Series Designator:
Unjc
Quick Specs
Thread Size 1/4
Thread Qty 20
Material Iron
Length 43/64

Additional Information

SKU / Model: 642AS0748
NSN: 5305-01-078-5070
FSC: Screws / 5305
Pack Weight (Approx.) 0.000 lb
Minimum Qty (MOQ): 1 EA
Schedule B: 7318.15.6080
ECCN: 9A991
National Motor Freight: 093486, Bolts,nuts Or Screws, Noi (sub 3)
Download PDF Version
642AS0748_Military-Fasteners-com.pdf
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I placed this order late at 4:15 over the phone, 15 minutes past the cut off time.(Which rarely happens) It was critical for us to get the sparkplugs as a customer had called me and scheduled to bring his plane in the next day to have all his plugs replaced. My sales agent said she would personally go and pull the product so it would ship that day, and she did what she said. She saved me the embarrassment of telling my customer I forgot to order his parts on time and making him reschedule a maintenance visit. I am thankful you have people like her who really care about the customer and want to put in the extra effort for customer service. In my aircraft maintenance business I purchase everything I can first from Military Fasteners before I go looking for other venders. I use Military Fasteners because of the great customer service, free shipping (which is one day ground), large selection on hardware and materials, and competitive prices. I am a loyal customer and I order 2-3+ times a week. Thank you for the great service that your people provide at Military Fasteners.

5.0

Great service, I run a small GA workshop and I can count on Military Fasteners even though I'm in Australia, its quicker than getting it in Australia most of the time. The web site is great and simple to find the parts needed.

4.0

I have never gotten anything but the greatest, most prompt service from Military Fasteners.

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Fast, friendly and professional service that only Military Fasteners can provide with every order that I have placed with them.

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