Essential Critical Infrastructure Business

November 25th, 2020

Metro Bolt & Fastener remains open as an Essential Critical Infrastructure Business

Dear Valued Customers and Suppliers:

Metro Bolt & Fastener is committed to monitoring the COVID-19 situation and following the guidance of federal and local government as we navigate this situation. The health, safety, and welfare of our customers, suppliers, and employees are of utmost importance to us. We will continue to follow enhanced cleaning, safety, social distancing, and other CDC recommended guidelines to protect our contacts and help mitigate spread.

We will remain open as an essential supplier to hospitals, municipalities, transportation, and other crucial infrastructures.

For more information on essential, critical infrastructure, please visit

Metro Bolt & Fastener will continue to offer normal shipping, delivery, and pickup options. However, if you wish to pick up your order, but do not want to enter the building, when you arrive please call 313-538-4800 and ask for delivery to your vehicle.

For suppliers, vendors, and shipping partners – we are accepting deliveries. Please call from your vehicle or truck prior to attempting entry. We are limiting the number of people admitted to the warehouse, for our safety and yours.

We thank you for your cooperation and support during this time.


CDC and MDHHS guidelines

In Process Control, Optical Comparator, Hardness Testing & Product Testing

six sigmaThe next time you purchase any product from Metro Bolt & Fastener, remember this; There are several quality test methods that are performed prior to your purchase. But first let's define what Metro Bolt & Fastener means when we say "Quality Control".

Quality, is a conformance with products' specifications. Control, is consistency with controlling the variables to ensure there are no defects. When we combine the two, Quality Control is a process of implementing product design dimensions and tolerances to produce products that are of consistently good quality within the design parameters. How do we ensure this happens? Lets' start here.


In Process Control

"In Process Control" consists of taking random samples throughout the manufacturing run and performing dimensional checks to ensure the equipment is running per plan.

Optical Comparator

An "Optical Comparator" machine is used to save time from preparing laboratory pieces and mounting them for microscopic examination.

Hardness Testing

"Hardness Testing" are readings made by indenting the surface of a material by penetrating a ball, diamond point or other shape into the material under a predetermined load.

Product Testing

At Metro Bolt & Fastener our product testing requires a minimum of three readings taken and an average calculated. All readings MUST be within the hardness values listed in the products specification.

Since the early 90's, quality systems have implemented various forms of 'prevent defect' control systems. The fastener industry employs in process testing and control, which has greatly reduced the occurrences of rejections. So the next time you purchase product from Metro Bolt & Fastener, you can be sure we've done our part to ensure you have the best materials to work with.

For more about this subject, you can visit the American Fastener Journal at these links.

American Fastener Journal -
Volume 31 - Number 2
Quality Test Methods -



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Our Location

We have a large, beautiful showroom with a friendly, highly knowledgeable staff (over 150+ years of combined knowledge). Come visit us for all of your fastener needs.
Metro Bolt & Fastener 19339 Glenmore
Redford, MI 48240
USA 1-313-538-4800