METRIC STANDARD PARTS 8 921 NUT STAMPED TYPE R TYPE NR TYPE SR GROUP UNIT THREAD SIZE PART NO TYPE PRIMEIUSE PKG M4 11502520 SR Phos M5 11501793 SR Phos M6 3 11503417 SR Zinc M6 3 11508466 SR Zinc Organic M16 x 2 11502517 R Phos 1 M8 X 1 25 11502513 R I Phos I 8 924 NUT FLAT HEAD TYPE A BLIND INSERT 5 GROUP UNIT THREAD SIZE LENGTH PART NO PRIME USE PKG I I8 1 25 18 11504055 ZINC 1 L L WAREHODSING AND DISTRIBUTION DIVISION OF GENERAL MOTORS CORPORATION 89 380