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If you know the exact part number, enter it in the search box. Most part numbers require an MS prefix (MS40S5-2S). If you are unsure of the part number, type the first 3 letters or numbers and put an * after it to broaden your search results. Or try our SITE MAP.


Aircraft fasteners cowling kits racing and 1/4 turn studs Made in USA

This website offers general information and easy access to our products. If you need detailed technical expertise, please contact our design team with specific requests.

#5 Series A-Spec Studs, Stainless (AirlocŪ compatible)
#5 Series A-Spec Studs, Stainless (AirlocŪ compatible)

Please select your preferred Head Style from the list below. After clicking the head style, you will be able to select your desired length. If you have any questions need assistance, please contact us. We will be glad to help.

Sizing Chart: All studs on this page have a head diameter of 9/16" (.563) and a shank diameter of approx. 1/4" (.265). For your reference, we have included a chart at the bottom of this page which shows the panel thickness ranges and corresponding stud lengths.

Price Breaks : The per each price is displayed with the product. Quantity based discount prices are automatically generated and shown when the item is added to the shopping cart. The breaks are at the following quantities: Each, 50, 100, 250, 500 and 1000. Please Contact Us for a quote on larger quantities.

* Each new stud will require a new cross pin and maybe a new grommet. So be sure to add them before checking out, and don't forget about the installation tools. We keep all of these items in stock to make your project go smoothly. If you have any questions or need additional information, please Contact Us.

Head diameter .560" shank diameter .265

Head diameter .560" shank diameter .265

Head diameter .560" shank diameter .265

Head diameter .560" shank diameter .265"

Reference Information

This drawing is for reference only. The chart below has the stud dash number in the far left column. This is the number that is stamped in the head of the stud. The next column shows the Total Material Thickness range (TMT) of each stud length. The next column shows the B dimension of the stud (blank length). The far right column shows the A dimension for each dash number so you can measure and replace an existing stud. * Please note: A-Spec studs only vary by .010" from size to size so it is important to measure very accurately when using them. Dimensions are in inches. For metric conversion, use this formula: Inches x 25.4 = mm.  mm ÷ 25.4 = Inches. If you have any questions or need anything else, please Contact Us.

    About us

    We appreciate the support from everyone that uses Genuine MilSpec Products, and over the years it has been that support which has led to our growth. We will continue to work hard to provide fast, friendly and dependable service that will earn your trust in the future.

    MilSpec makes no claims regarding suitability of any item for any application. It is the responsibility of the purchaser, or installer to ensure proper usage and regulatory compliance.

    All content Copyright 1993 - 2017© MilSpec Products, Inc., All Rights Reserved. Trademarks® referenced are the property of their respective owners and do not indicate affiliation with MilSpec.

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    MilSpec Products
    31537 Long Acres Dr.
    Sorrento, FL 32776
    352-735-0504 (fax)
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