568-278 BUNA 70 SQUARE CUT RINGS

This Buna-N NBR 70A Square Ring, item SH70278, is designed for buyers who need a clear specification match for static sealing and gland designs that call for a square-cut sealing profile. The item is specified by AS568-278; 11.984 inch (304.39 mm) ID x 0.139 inch (3.53 mm) CS; 12.262 inch (311.45 mm) OD, with 12 inch nominal ID; 1/8 inch nominal CS for cross-reference against common gland and replacement dimensions. Its Buna-N nitrile (NBR) material provides 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. Common purchasing identifiers for this product include the material name, O-ring type, dimensional size, hardness and intended sealing application. Those attributes make the item easier to compare for maintenance, OEM production, MRO replacement and reseller catalog use.