Polyshrink™
Two options for Polyshrink™ are available: Standard – up to 230°F / 110°C, and high-temp HT – up to 428°F / 220°C. U-bolts can also be ordered without Polyshrink™.

What is a Nu-Bolt®?
1. Coated fasteners: Carbon-steel U-bolts and nuts are available coated with hot-dipped galvanized or SermaGard™. ArmorGalv® is also available, as are 316 SS U-bolts.

2. I-Rod® material is a durable, half-round thermoplastic with high compressive strength and little-to-no creep over time. I-Rod® and I-Rod® UV+ (white) can be used up to 181°F (83ºC), I-Rod® HT (amber) up to 340°F (171ºC) and I-Rod® PEEK (tan) up to 480°F (249ºC).

3. Choose gripping or non-gripping U-bolts: Gripping Nu-Bolts® do not allow pipe movement; Non-gripping Nu-Bolts® allow movement due to thermal expansion and contraction. XL Nu-Bolts® are non-gripping with slightly larger dimensions to prevent coating damage during pipe movement. 

4. Polyshrink™ is a UV-stable, cross-linked polyolefin applied over the shank of the U-bolt to protect the pipe’s coating during installation.  Standard Polyshrink™ temps: Up to 110ºC (230ºF); Hi-Temp: Up to 220ºC (428ºF).