568-345 BUNA 70 SQUARE CUT RINGS

Item SH70345 is a Buna-N NBR 70A Square Ring built for static sealing and gland designs that call for a square-cut sealing profile. The item is specified by AS568-345; 3.975 inch (100.97 mm) ID x 0.21 inch (5.33 mm) CS; 4.395 inch (111.63 mm) OD, with 4 inch nominal ID; 3/16 inch nominal CS for cross-reference against common gland and replacement dimensions. The Buna-N nitrile (NBR) compound is selected for oil, grease, fuel and general hydraulic fluid resistance in common industrial equipment. It is with a listed temperature range of -40°F (-40°C) to 250°F (121°C), which can help narrow material selection for heat, cold or process exposure. The black color and square profile provide a practical visual identifier during receiving, stocking and installation. The square-cut profile can help fill rectangular glands and provide broad contact for compatible static sealing designs. The each-unit format supports precise replacement, kitting, resale and job-specific purchasing. Key selection details include material, hardness, product type, cross-section, inside diameter, outside diameter and application. These specification details help customers and resellers compare the part by performance requirements rather than brand name alone.