Aircraft Spruce Canada
Brantford, ON Canada
Corona, CA | Peachtree City, GA
Chicago, IL | Wasilla, AK
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AN4-51 Drilled Bolt
MFR Model# 31725-1
| Dash No. | Nominal Length | Grip Length | AN4C Stainless Drilled | AN4C Stainless Undrilled |
|---|---|---|---|---|
| -51 | 5-5/32 | 4-11/16 | -- | -- |
Overview
|
Hex head aircraft bolts are made of high-strength type 4037 or 8740 alloy steel (type 8740 is most commonly used). The bolts are centerless ground and threaded after heat treatment. Minimum tensile strength 125,000 PSI. Cadmium plated per specification QQ-P-416A, Type II, Class 3. Available with shank drilled for cotter pin or undrilled for stop nut application, and with or without drilled head for safety wire. Specify bolts to have undrilled shank by adding letter "A" after the dash number. For bolts with drilled head add letter "H" after the AN number. See illustrated examples. "C" represents Type 431 Stainless Steel (contains iron which is magnetic). The length of AN aircraft bolts is measured from under the head to the end of the shank. The "grip" is the unthreaded portion of the shank. See table for conversion of length and/or grip to proper AN callout. 15% discount on qty of 50-99 20% discount on qty of 100+ Note: Drilled bolts listed above are drilled shank only. To order drilled head only or both drilled head and shank bolts, please use our AN Bolt Selector by clicking the link below. Click here for the AN Bolt Selector |
Reference Chart
Reference Chart
Reviews
It’s a bolt. Works good. Lasts a long time
Although the bolts came from three different places, in 3 different shipments, they all arrived on time and were all correct. Whatever system you used to pull that off seems to be working.. Thanks,
Supplied as requested
Always great service, correct parts and fast shipping. Thanks
👍
Very good quality bolts from Aircraft Spruce
Great service on a great a product line.
Bolt was as advertised and is working great.
as usual.
The grip and thread length needed was unusual and not available locally. There were plastic sleeves protecting the threads during shipment, nice touch. The bolts fit perfectly!
Q&A
Please note, Aircraft Spruce Canada's personnel are not certified aircraft mechanics and can only provide general support and ideas, which should not be relied upon or implemented in lieu of consulting an A&P or other qualified technician. Aircraft Spruce Canada assumes no responsibility or liability for any issue or problem which may arise from any repair, modification or other work done from this knowledge base. Any product eligibility information provided here is based on general application guides and we recommend always referring to your specific aircraft parts manual, the parts manufacturer or consulting with a qualified mechanic.
The discount schedule for large quantities are: 50-100 = 15% / 100+ = 20%. Package quantities are usually 25 but we can sort them however you prefer as long as you mention it in special instructions at checkout.
Use the AN Bolt Selector page. Keyword search "AN Bolt Selector" on our website and click the first result, then use the drop down selections on the page to choose the bolts you need.
