United StatesChange

355 Concrete Insert



  • Structural attachment in all grades of concrete
  • Knockout keeps interior empty during pour
  • Allows for horizontal rod adjustment up to 1-1/4”
  • 355N Insert Nut required for UL Listing and FM Approval
  • Conforms with Federal Specification WW-H-171 (Type 19), Manufacturers Standardization Society ANSI®/MSS-SP-58 (Type 18)


Part Number 3550000EG
Material Steel
Finish Electrogalvanized
Rod Size (RS) 3/8"
A 1 5/8"
B 3 9/16"
C 3"
Pipe Size 10" Max
Static Load (F) 1,200 lb
Certifications cULus
Standard Packaging Quantity 150 pc
UPC 78285635096
EAN-13 8711893090864
Rod should be threaded through the nut until it tightens against the top of the insert.
For installation, place knockout side down on concrete form and nail in place. Wire 12” piece of #4 reinforcing rod on both sides. After concrete pour, knockout can be removed with a screwdriver.
cULus® Listed for 3/8" rod size up to 4" pipe and 1/2", 5/8" and 3/4" rod sizes up to 6" pipe.
FM® Approved for 3/8", 1/2", 5/8", and 3/4" rod sizes up to 8" pipe.
Install in accordance with applicable code.

nVent, nVent CADDY, nVent ERICO, nVent ERIFLEX, and nVent LENTON are owned by nVent or its global affiliates. All other trademarks are the property of their respective owners. nVent reserves the right to change specifications without prior notice.

ANSI is a registered trademark of American National Standards Institute.
FM is a registered certification mark of FM Approvals LLC, LTD.
UL, UR, cUL, cUR, cULus and cURus are registered certification marks of UL LLC.