3M1278E4D7A

Bolt

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Description:

Fastener Length: 7/8", Hole Diameter: 5/64", Thread: 1/4-28, Thread Length: 27/64"

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3M1278E4D7A Datasheet Features and Specification

Thread Class:
3a
Thread Direction:
Right-hand
Thread Length:
0.425 inches nominal
Fastener Length:
0.8475 inches minimum and 0.8775 inches maximum
Head Style:
Flat countersunk
Head Diameter:
0.388 inches minimum and 0.395 inches maximum
Shoulder Diameter:
0.2802 inches minimum grip and 0.2807 inches maximum grip
Shoulder Length:
0.3775 inches nominal grip
Hole Diameter:
0.076 inches minimum and 0.086 inches maximum
Spline Minor Diameter:
0.1105 inches minimum and 0.1125 inches maximum
Spline Major Diameter:
0.1540 inches minimum and 0.1560 inches maximum
Internal Drive Style:
Torx
Thread Diameter:
0.2500 inches
Hole Quantity:
1
Hole Type:
Drilled
Features Provided:
Cetyl alcohol lubricant
Thready Qty Per Inch (tpi):
28
Countersink Angle:
99.0 degrees minimum and 101.0 degrees maximum
Criticality Code Justification:
Agav
Shoulder Shape:
Round grip
Part Name Assigned By Controlling Agency:
Eddie bolt aircraft
Material:
Nickel alloy 718 overall
Material Specification:
Ams5662 assn std single material response overall
Surface Treatment:
Passivate overall
Surface Treatment Specification:
Mil-l-87132 type 1 grade b mil spec single treatment response overall
Thread Series Designator:
Unjf
Quick Specs
Thread Size 1/4
Thread Qty 28
Material Nickel
Length 7/8

Additional Information

SKU / Model: 3M1278E4D7A
NSN: 5305-01-536-4447
FSC: Screws / 5305
Pack Weight (Approx.) 0.000 lb
Minimum Qty (MOQ): 1 EA
Schedule B: 7508.90.5000
ECCN: 9A991
National Motor Freight: 096640, Screws, Iron Or Steel
Download PDF Version
3M1278E4D7A_Military-Fasteners-com.pdf
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Props to my saleslady (whose name I have sadly forgotten) for her can do attitude. Fast and efficient yet friendly and thorough. The items arrived nicely padded with brown paper. Im so happy youve stopped using those hard-to-dispose-of styrofoam peanuts. Fast to ship reasonable prices. Just excellent all around!

4.0

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5.0

I have been satisfied overall with the service I get from Military Fasteners. I have never had an issue with any of my orders, they have been prompt and fulfilled error free.

5.0

At every point, Dania McLean's help was crucial and showed a great dedication to the business. She handled my questions with amazing skill right away, making sure every one of them received a comprehensive and perceptive answer. Her unwavering professionalism and contagious optimism, which made every interaction enjoyable, were what really stood out.

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