1/4"-28 Grade 18-8 NE Stainless Steel Nylon Insert Lock Nut / THREAD CLASS: 2B THREAD DIRECTION: RIGHT-HAND LOCKING FEATURE: PREVAILING TORQUE ALL NONMETALLIC DESIGN NUT STYLE: A12 HEXAGON NUT HEIGHT: 0.225 INCHES NOMINAL END ITEM IDENTIFICATION: MRAP-RG-31; MRAP - M-ATV UI WIDTH ACROSS FLATS: 0.430 INCHES MINIMUM AND 0.439 INCHES MAXIMUM THREAD SERIES: UNF THREAD QUANTITY PER INCH: 28 NOMINAL THREAD SIZE: 0.250 INCHES BEARING SURFACE TYPE: FLAT SPECIAL FEATURES: NUT OVERALL HEIGHT WITH LOCKING INSERT IS 0.298 INCHES MINIMUM AND 0.328 INCHES MAXIMUM; MATERIAL IS GRADE 18-8 STAINLESS STEEL; PREVAILING TORQUE DESIGN PER IFI 100/107, WITH A CLAMP LOAD OF 50 PERCENT OF GRADE A MATERIAL: PLASTIC NYLON LOCKING INSERT MATERIAL: STEEL COMP 302 NUT