Square MF Locknuts


These Thimble Eye Nuts are In-Stock and Ready to Ship!

Call Us at 714-676-8200 to Order


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Don’t see the Square MF Locknuts you want?

We will custom manufacture pole line accessories to your exact specifications.

Call us at 714-676-8200.

Square MF locknuts provide tight connections between bolts and nuts to prevent loosening over time.  The MF locknut can be used as a locking nut on the back of square. These concave square MF locknuts are designed to spin freely by hand. When tightened down over an existing nut, the arch is flattened causing a permanent set.  Hot dipped galvanized MF locknuts are tapped oversize to compensate for the corrosion resistant coating on the bolts.

Square MF Locknuts - Pole Line Hardware - Tengco

Square MF Locknut

HDG (Over Tapped)

MF Locknut Size Box Qty Lbs/M Tengco P/N
3/8 – 16 2000 12 PNF3816-H
1/2-13 2600 25.08 PNF1213-H
5/8-11 800 36.98 PNF5811-H
3/4-10 1000 54.32 PNF3410-H
7/8-9 800 70.84 PNF789-H
1-8 400 109.43 PNF18-H

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Since 1979 Tengco has supplied our customers with superior custom manufactured parts for a wide variety of industries and applications. Our mission is to provide quality products on time at competitive prices.

From standard nuts and bolts to specialty fasteners (including square MF locknuts), castings, forgings and stampings, our extensive product knowledge can help your organization maintain the highest standards for your custom parts.

Address: 14030 Bolsa Lane, Cerritos, CA 90703

Phone: (714) 676-8200

How Can Tengco Help You?

Tengco is a hardware distributor that provides global sourcing solutions for custom manufacturing.  We provide world class global sourcing, service and distribution.

Tengco is the perfect solution to your global sourcing needs.  We can provide anything from standard nuts and bolts to square MF locknuts and specialty fasteners, castings, forgings and stampings

We have been working with our customers for over 35 years to develop custom metal components for a wide variety of industries and applications.

Tengco is ISO 9001:2015 Certified through our midwest distribution center and the combination of our experienced engineering team, logistics team, customer service representatives and sales staff can help your organization maintain the highest standards for your custom parts.

Tengco supplies customers throughout the United States, Canada, Mexico, South America, Europe and Asia and we can’t wait to speak to you about how we can help your organization.

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Don't See What You Were Looking For?

Call us at 714-676-8200.  We can make your special item!

Our experienced engineers can help develop your custom forging, casting, stamping or machined part.