Part number 21-3 appears under 66 stock numbers

Manufacturers reuse part numbers across items. Each stock number below is its own federal item record — pick the one your drawing or solicitation cites.

3110-00-144-8561 — BEARING,BALL,ANNULAR · FSC 3110
3110-00-554-3246 — BEARING,BALL,ANNULAR · FSC 3110
5315-00-687-5218 — KEY,WOODRUFF · FSC 5315
5940-00-983-6090 — TERMINAL BOARD · FSC 5940
2940-00-006-6279 — FILTER ELEMENT,INTAKE AIR CLEANE · FSC 2940
7510-01-347-1456 — TAPE,PRESSURE SENSITIVE ADHESIVE · FSC 7510
6240-01-114-6349 — LAMP,INCANDESCENT · FSC 6240
5315-00-197-3411 — KEY,WOODRUFF · FSC 5315
3110-00-117-1569 — BEARING,ROLLER,JOURNAL · FSC 3110
5940-01-115-4455 — TERMINAL,LUG · FSC 5940
6685-01-085-2495 — GAGE,PRESSURE,DIAL INDICATING · FSC 6685
6685-01-118-2807 — GAGE,PRESSURE,DIAL INDICATING · FSC 6685
6685-01-112-5744 — GAGE,PRESSURE,DIAL INDICATING · FSC 6685
4730-00-984-2392 — TRAP,STEAM · FSC 4730
7510-00-884-3698 — TAPE · FSC 7510
4720-01-437-8059 — TUBING,NONMETALLIC · FSC 4720
4820-01-437-2948 — STEM,FLUID VALVE · FSC 4820
5935-00-493-1781 — ADAPTER,CONNECTOR · FSC 5935
5315-01-328-4105 — PIN,RETAINING · FSC 5315
3040-01-307-8344 — SHAFT,SHOULDERED · FSC 3040
5340-00-864-4685 — CAP-PLUG,PROTECTIVE,DUST AND MOI · FSC 5340
3455-01-410-8333 — CUTTER,MILLING,PLAIN · FSC 3455
6685-01-042-6723 — GAGE,PRESSURE,DIAL INDICATING · FSC 6685
5905-00-660-3519 — RESISTOR,VARIABLE,WIRE WOUND,NON · FSC 5905
5310-00-262-3608 — WASHER,LOCK · FSC 5310
2010-00-256-5463 — COUPLING,FLEXIBLE,FLANGED · FSC 2010
6605-00-248-0594 — COMPASS,MAGNETIC,MOUNTED · FSC 6605
5310-00-247-8633 — WASHER,FLAT · FSC 5310
5360-00-086-9219 — SPRING,HELICAL,COMPRESSION · FSC 5360
7025-01-266-5176 — OPTICAL READER,DATA ENTRY · FSC 7025
6250-01-201-2697 — LAMPHOLDER · FSC 6250
2530-01-180-7112 — CAP,GREASE · FSC 2530
5331-01-158-6432 — O-RING · FSC 5331
4730-00-795-2062 — COUPLING HALF,QUICK DISCONNECT · FSC 4730
6680-01-455-4818 — INDICATOR,SIGHT,LIQUID · FSC 6680
6680-01-438-5263 — INDICATOR,SIGHT,LIQUID · FSC 6680
6680-01-438-5262 — INDICATOR,SIGHT,LIQUID · FSC 6680
6680-01-438-2953 — INDICATOR,SIGHT,LIQUID · FSC 6680
6680-01-438-2952 — INDICATOR,SIGHT,LIQUID · FSC 6680
6680-01-438-2951 — INDICATOR,SIGHT,LIQUID · FSC 6680
6680-01-438-1534 — INDICATOR,SIGHT,LIQUID · FSC 6680
6680-01-438-1533 — INDICATOR,SIGHT,LIQUID · FSC 6680
6680-01-438-1532 — INDICATOR,SIGHT,LIQUID · FSC 6680
6680-01-438-1531 — INDICATOR,SIGHT,LIQUID · FSC 6680
6680-01-437-8353 — INDICATOR,SIGHT,LIQUID · FSC 6680
6680-01-437-7779 — SHIELD,GAGE,SIGHT,LIQUID INDICAT · FSC 6680
6680-01-437-6278 — INDICATOR,SIGHT,LIQUID · FSC 6680
5999-00-132-0311 — HEAT SINK,ELECTRICAL-ELECTRONIC · FSC 5999
5306-00-078-6692 — BOLT,EYE · FSC 5306
7450-00-063-3980 — RECORDER-REPRODUCER,SOUND · FSC 7450

Showing the 50 best-attested of 66 stock numbers. Search for 21-3 to see the rest.