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5/16 Castellated Nuts

Hex Castle Nuts or Castellated Nuts have notches on one end, which resemble the serrated tops of castle parapets. These nuts are used with a bolt with cross-drilled holes, so that a cotter pin can pass through the nut and into a hole in a bolt shank, thus preventing the nut from loosening. The notched end is turned down slightly, allowing the cotter pin to be bent around the nut. Often used in machinery, shafts and automotive applications.

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Search Results Sponsored by Perigee Manufacturing, your source for Castellated Nuts. For more results, visit   perigeemfg.com
SupplierLocTypeMaterialFinishSizeDescriptionQty 
PerigeeMICastle Nut (Hex)300 Stainless (A1,A2, 18-8,304,310 etc.)Cadmium/Yellow5/16-245/16-24 x 1/2 x 21/64 hex castellated airframe nut b18.2.21095
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PerigeeMICastle Nut (Hex)300 Stainless (A1,A2, 18-8,304,310 etc.)Cadmium/Yellow5/16-245/16-24 x 1/2 x 21/64 hex castellated airframe nut b18.2.24863
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PerigeeMICastle Nut (Hex)300 Stainless (A1,A2, 18-8,304,310 etc.)Plain5/16-245/16-24 x 1/2 x 3/16 hex castellated shear nut b18.2.22960
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PerigeeMICastle Nut (Hex)Grade APlain5/16-18 x 1/2 x 21/645/16-18 x 1/2 x 21/64 hex castle nut b18.2.248
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Buy Castellated Nuts from one of our FCH Network Members
CenturyFLCastle Nut (Hex)300 Stainless (A1,A2, 18-8,304,310 etc.)Cadmium/Yellow5/16-24an310c5 nut9
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CenturyFLCastle Nut (Hex)SteelCadmium/Yellow5/16-24an320-5 nut q2c5
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CenturyFLCastle Nut (Hex)300 Stainless (A1,A2, 18-8,304,310 etc.)Plain5/16-24an320c5 nut cstl shear26
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CenturyFLCastle Nut (Hex)SteelCadmium/Yellow5/16-24an310-5 castle nut5
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WeaverWACastle Nut (Hex)300 Stainless (A1,A2, 18-8,304,310 etc.)Plain5/16-185/16-18 castle nut 18-8 ss30
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METRO INDOHCastle Nut (Hex)SteelPlain5/16-24castle nut sae75
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HayesCACastle Nut (Hex)BrassPlain5/16-185/16-18 castle nut brass58
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HayesCACastle Nut (Hex)SteelZinc/Clear5/16-245/16-24 castle nut zinc75
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HayesCACastle Nut (Hex)300 Stainless (A1,A2, 18-8,304,310 etc.)Plain5/16-185/16-18 castle nut 18-8ss22
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YANKEENHCastle Nut (Hex)SteelZinc/Clear5/16-245/16-24 hex castle slotted nut zinc pltd34
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SWACOOHCastle Nut (Hex)Plain5/16-24castellated nut _x000d_thread 5/16-24 self locking hexagon non metallic insert locknut-castellated ms17825 series nut9
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AIHAZCastle Nut (Hex)SteelCadmium5/16-245/16-24 nylon insert castle lock nut steel cad12
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AIHAZCastle Nut (Hex)300 Stainless (A1,A2, 18-8,304,310 etc.)Plain5/16-245/16-24 unf 3a nut s/s 304ss AN310C512
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CNBILCastle Nut (Hex)SteelZinc/Clear5/16-245/16-24 castle nut zinc plated1371
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NAPPCOTXCastle Nut (Hex)300 Stainless (A1,A2, 18-8,304,310 etc.)Plain5/16-24hex castle nut s/s 18-8 5/16-24 115
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ACCURATEILCastle Nut (Hex)SteelPlain5/16-24castle nuts63
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NutsBoltsNECastle Nut (Hex)SteelPlain5/16-245/16-24 castle nut165
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LibertyILCastle Nut (Hex)SteelZinc/Clear5/16-24hex castle nut970
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Raw ProduNJCastle Nut (Hex)300 Stainless (A1,A2, 18-8,304,310 etc.)Plain5/16-18castle nuts 304 ss 5/16-18207
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Raw ProduNJCastle Nut (Hex)BrassPlain5/16-18castle nuts brass 5/16-1873
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Raw ProduNJCastle Nut (Hex)300 Stainless (A1,A2, 18-8,304,310 etc.)Plain5/16-24castle nuts 304 ss 5/16-2424
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Fastener OHCastle Nut (Hex)SteelPlain5/16-18 x 1.8castle nut 5/16-18 1.8 50
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WeaverWACastle Nut (Hex)SteelZinc/Clear5/16-245/16-24 castle nut zinc140
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MidStatesMICastle Nut (Hex)300 Stainless (A1,A2, 18-8,304,310 etc.)Plain5/16-18castle nut 18-850
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NorthernMNCastle Nut (Hex)Grade 5Plain5/16-24s/o 5/16-24 nf gr5 castle nut plain pkg65
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NorthernMNCastle Nut (Hex)Grade 5Zinc/Clear5/16-24nf gr5 castle nut pkg48
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HBBOLTCACastle Nut (Hex)300 Stainless (A1,A2, 18-8,304,310 etc.)Plain5/16-24castle nut 18-8113
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DeltaTXCastle Nut (Hex)SteelZinc/Clear5/16-24fin castle nut steel zinc nf 5/16-24 (FINE THREAD)3084
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DeltaTXCastle Nut (Hex)SteelZinc/Clear5/16-18fin castle nut steel zinc 5/16-18100
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CascadeORCastle Nut (Hex)SteelPlain5/16-24castle s b18.2.22100
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SISAZCastle Nut (Hex)SteelCadmium/Yellow5/16-24castle nut low-height steel cad ii plated AN320-5200
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Kanebridge ILCastle Nut (Hex)SteelZinc/Clear5/16-245/16-24 castle nut zinc7.500
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Kanebridge ILCastle Nut (Hex)SteelZinc/Clear5/16-185/16-18 castle nut zinc7.500
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Kanebridge ILCastle Nut (Hex)Grade 5Zinc/Clear5/16-245/16-24 castle nut grade 5 zinc7.500
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OSSCORICastle Nut (Hex)SteelPlain5/16-245/16-24 castle nut b18.2.295
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OSSCORICastle Nut (Hex)SteelZinc/Clear5/16-245/16-24 castle nut plated b18.2.23
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PerigeeMICastle Nut (Hex)300 Stainless (A1,A2, 18-8,304,310 etc.)Cadmium/Yellow5/16-245/16-24 x 1/2 x 21/64 hex castellated airframe nut b18.2.21095
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PerigeeMICastle Nut (Hex)300 Stainless (A1,A2, 18-8,304,310 etc.)Cadmium/Yellow5/16-245/16-24 x 1/2 x 21/64 hex castellated airframe nut b18.2.24863
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PerigeeMICastle Nut (Hex)300 Stainless (A1,A2, 18-8,304,310 etc.)Plain5/16-245/16-24 x 1/2 x 3/16 hex castellated shear nut b18.2.22960
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PerigeeMICastle Nut (Hex)Grade APlain5/16-18 x 1/2 x 21/645/16-18 x 1/2 x 21/64 hex castle nut b18.2.248
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PerigeeMICastle Nut (Hex)400 Stainless (405, 410,416,420,430 etc.)Passivated5/16-24 x 1/2 x 21/645/16-24 x 1/2 x 21/64 hex castle nut b18.2.2298
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THRDFASTFLCastle Nut (Hex)SteelPlain5/16nf-24 castle nut b18.2.286
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All SizeTXCastle Nut (Hex)SteelPlain5/16-185/16-18 slotted castle nut plain b18.2.24,690
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All SizeTXCastle Nut (Hex)SteelPlain5/16-245/16-24 slotted castle nut b18.2.23,571
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All SizeTXCastle Nut (Hex)SteelPlain5/16-245/16-24 slotted castle nut plain b18.2.2458
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