Nylon Threaded Inserts for Precast Concrete Utility Racking
Click and drag to rotate 3D model

Securely bolt utility racking to precast concrete structures with highly durable nylon threaded inserts. Resistant to corrosion, warping, conductivity, and heat, our BUI 5000 inserts are made of Minlon® Nylon 6/6 from DuPont Engineering Polymers. Order yours now or request complimentary test samples.
Advantages for precasters
- Designed for high pullout strength
- Precise bolt channels every time
- Insert stays immobile during pour
- No secondary prep for inside form
- Unaffected by casting heat
- Universal application for racking

Benefits for utilities
- Superior nylon durability
- Resistant to corrosion
- No warping over time
- Nonconductive and noncorrosive
- Field tested by multiple utilities
- Track record of 50+ years

See How It Works
Step-by-Step Instructions
Simple six step process can be managed by one person.
- 1Determine placement of racking on your precast concrete form.
- 2Drill 5/8” holes on the form where the racking will be secured.
- 3Hammer the tips of the nylon inserts into the predrilled form holes.
- 4Pour the concrete mix into your form around the inserts.
- 5Strip the form and watch the insert tips shear off automatically.
- 6Attach racking to the cast concrete using ½” bolts for the threaded insert holes.
Timesaving Breakaway Tip
Setting up threaded inserts on precast concrete forms can be a labor intensive process. Bell Utility Inserts makes mounting easy and efficient for just one worker in minimal time. Conveniently attached to our BUI 5000 product is a 13/16” extended tip with external ridges to secure the insert to your precast form. The tight fit ensures the insert remains level when pouring and vibrating the concrete mix. The tip automatically shears off as the mold is stripped. Quickly set up for the next pour.

The Nylon 6/6 Difference
Most precast concrete inserts are made of standard polymers. Bell Utility Inserts uses mineral filled Nylon 6/6 for superior mechanical strength, stiffness/toughness balance, chemical resistance, low warpage, and paintability. Nylon 6/6 reduces moisture in the sensitivity of raw products while offering high dimensional stability. Its thermal properties include a melting point far exceeding the recommended top curing levels for precast concrete.
Chemical Formula: (C12H22N2O2)N
Density: 1.140 gm/mL
Melting Point: 264oC (507oF)

Order Today.
Box of 500 Nylon Threaded ½” Inserts
BUI5000
You can place your order directly at 775-352-6328
About Us
Bell Utility Inserts provides highly durable nylon threaded racking inserts to precast concrete businesses manufacturing products for utility companies. Designed in conjunction with Bell Laboratories in the early 1970s, our BUI 1500 insert is made of the same Nylon 6/6 material used in the aerospace industry and was awarded the first patent for its mounting and breakaway qualities.
We’re located in Sparks, Nevada. Our products are made in the United States.