Grainger 1/4" UNC hex nut 3PDG5, self-locking with nylon insert

Secure 1/4" UNC Hex Nut with Self-Locking Feature

The Grainger 1/4" UNC hex nut 3PDG5 with nylon insert is the right choice when you want to make bolted connections secure and resistant to vibration. Unlike a standard hex nut, this model features an integrated nylon insert that provides additional thread locking. This makes the nut particularly suitable for applications where shocks or movement could cause a connection to loosen unintentionally. That’s exactly why this self-locking nut is a practical solution for many technical, craft, and also photographic applications.

The 1/4" UNC thread is particularly interesting because it corresponds to the common standard photo thread. This size is used on many tripods, mounts, quick-release plates, camera accessories, and adapter solutions. So if you are looking for a durable nut with protection against loosening for photo accessories or other fastening solutions, this version is an excellent choice.

More grip thanks to integrated nylon insert

The integrated nylon insert ensures that the nut engages positively with the external thread when screwed on. This creates additional friction that makes it significantly more difficult for the nut to loosen prematurely due to vibrations or recurring movements. This is precisely what makes self-locking nuts with nylon inserts so popular when a connection needs to remain reliably secure over the long term.

The nut is reusable and is therefore also of interest for applications where components need to be loosened and reassembled as required. At the same time, you should note that this design is not intended for high temperatures, as the nylon insert is not heat-resistant. For many standard applications indoors, in workshops, or for accessory installations, however, it is a proven and practical solution.

Robust Grade 8 steel quality with yellow zinc-plated surface

Made from Grade 8 high-strength steel, the Grainger 3PDG5 hex nut provides a robust and durable basis for secure bolted connections. The yellow zinc-plated Zinc Yellow surface offers additional protection and gives the nut a hard-wearing finish for everyday use. This makes it suitable for many general assembly tasks as well as for special applications where a strong and long-lasting connection is required.

Thanks to the standard hex shape, you can easily install the nut using common tools. At the same time, it remains compact enough to be integrated into existing constructions or accessory solutions.

Technical specifications at a glance

The Grainger 1/4" UNC hex nut 3PDG5 is manufactured according to ASME B18.16.6 and impresses with practical dimensions. The width across flats is 7/16 inch, which corresponds to approximately 11.11 mm. The height is 5/16 inch, i.e. about 7.94 mm. This gives you a self-locking nut that can be mounted precisely while providing reliable locking performance.

• Product type: Hex nut, self-locking
• Model: Grainger 3PDG5
• Nut type: Hex
• Thread type: 1/4" UNC
• Thread size: 1/4"-20
• Note: 1/4" UNC is a standard photo thread
• Locking type: Nylon insert
• Thread form: Coarse thread
• Thread direction: Right-hand
• Material: Steel
• Strength class: Grade 8
• Width across flats: 7/16 inch (approx. 11.11 mm)
• Height: 5/16 inch (approx. 7.94 mm)
• Standard: ASME B18.16.6
• Reusable: Yes
• Application note: Not heat-resistant due to nylon insert

The product photos shown are for illustration purposes only and may differ from the actual scope of delivery; any accessories shown are not included in the scope of delivery.