Aeronautical Standard Close Tolerance Bolt

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Fastener Length: 2-27/32", Thread: 1/4-24, Thread Length: 17/32", hexagon head, fine thread, AN175 series bolt

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AN175-26 Price:
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$19.14 Each
Pre-packaged bag qty: 5 ea
* Sold in increments of 5
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AN175-26 Datasheet Features and Specification

Thread Class:
Thread Direction:
Thread Length:
0.532 inches minimum
Fastener Length:
2.844 inches nominal
Head Style:
Head Height:
0.172 inches minimum and 0.204 inches maximum
Width Between Flats:
0.490 inches minimum and 0.502 inches maximum
Grip Diameter:
0.3112 inches minimum and 0.3117 inches maximum
Shank Unthreaded Hole Diameter:
0.076 inches nominal first hole
Thread Diameter:
0.312 inches
Grip Length:
2.312 inches nominal
Thready Qty Per Inch (tpi):
Min. Tensile Strength (psi):
125000 pounds per square inch
Hardness Rating:
26.0 rockwell c minimum overall and 32.0 rockwell c maximum overall
Distance From Head Largest Bearing Surface To Shank Hole Center:
2.671 inches nominal first hole
Surface Finish:
63.0 microinches bearing surface of head
Surface Finish:
63.0 microinches grip
Steel comp 8740 overall or steel comp 8630 overall or steel comp 8735 overall or steel comp 4037 overall or steel comp 4140 overall or steel comp 4130 overall
Material Specification:
Mil-s-6049 mil spec 1st material response overall or mil-s-6050 mil spec 2nd material response overall or mil-s-6098 mil spec 3rd material response overall or ams 6300 assn std 4th material response overall or mil-s-5626 mil spec 5th material response overall or mil-s-6758 mil spec 6th material response overall
Surface Treatment:
Cadmium overall and chromate overall
Surface Treatment Specification:
Qq-p-416 type 2 class 3 fed spec all treatment responses overall
Thread Series Designator:
Quick Specs
Thread Size 1/4
Thread Qty 24
Material Steel
Length 2-27/32

Additional Information

SKU / Model: AN17526
NSN: 5306-00-180-0478
FSC: Bolts / 5306
Product Series: AN175
Pack Weight (Approx.) 0.355 lb
Minimum Qty (MOQ): 5
Schedule B: 7318.15.2000
National Motor Freight: 093486, Bolts,nuts Or Screws, Noi (sub 3)
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Product code AN175-26

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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.


Great company!! Devin B attention to detail and friendliness made all the difference


Got my new Beacon light for 172R works fine. Always get good service from Military Fasteners... Keep up the good work!


AS Always fast and great service by all.