Part Number: NAS1160-4-55 (Bolt shoulder hex hd close)Part Number: NAS1160-4-57D (Bolt shoulder hex hd close)Part Number: NAS1160-4-7 (Bolt shoulder hex hd close)Part Number: NAS1160-5-24 (Bolt shoulder hex hd close)Part Number: NAS1160-6-16 (Bolt shoulder hex hd close)Part Number: NAS1160-6-30D (Bolt shoulder hex hd close)Part Number: NAS1160-7-37 (Bolt shoulder hex hd close)Part Number: NAS1160-7-66 (Bolt shoulder hex hd close)Part Number: NAS1160A5-48 (Bolt shoulder hex hd close)