FCH News

Square Nuts , Plain (ASME B18. 2.2)

Square Nuts are just four-sided nuts, but compared to standard hex nuts, square nuts have a greater surface in contact with the part being fastened, and therefore provide greater resistance to loosening. Square nuts are typically mated with square-headed bolts.

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SupplierLocTypeMaterialFinishSizeDescriptionQty 
GLFOHSquare NutSteelPlain3/4-103/4-10 hvy square nut stl pln b18.2.2 () () ()10
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GLFOHSquare NutSteelPlain1/2-131/2-13 hvy square nut stl pln b18.2.2 () () ()210
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GLFOHSquare NutGrade 8Plain3/4-103/4-10 hvy square nut gr 8 stl pln domestic b18.2.2 () () ()64
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GLFOHSquare NutSteelPlain1 1/4-71-1/4-7 square nut stl pln b18.2.2 () () ()48
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GLFOHSquare NutSteelPlain3/4-103/4-10 square nut stl pln b18.2.2 () () ()190
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GLFOHSquare NutSteelPlain3/8-163/8-16 square nut stl pln b18.2.2 () () ()2406
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GLFOHSquare NutSteelPlain5/16-185/16-18 square nut stl pln b18.2.2 () () ()1300
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GLFOHSquare NutSteelPlain5/8-115/8-11 square nut stl pln b18.2.2 () () ()2200
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GLFOHSquare Nut300 Stainless (A1,A2, 18-8,304,310 etc.)Plain#6-32#6-32 square nut 18-8 s/s b18.2.2 () () ()598
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GLFOHSquare Nut300 Stainless (A1,A2, 18-8,304,310 etc.)Plain#8-32#8-32 square nut 18-8 s/s b18.2.2 () () ()2200
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GLFOHSquare Nut300 Stainless (A1,A2, 18-8,304,310 etc.)Plain1/4-201/4-20 square nut 18-8 s/s b18.2.2 () () ()122
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GLFOHSquare NutSteelPlain1-81-8 sq nut stl pln b18.2.2 () () ()75
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BHAMALSquare NutSteelPlain1/2-131/2-13 reg. square nuts b18.2.285
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BHAMALSquare NutGrade 8Plain1-81-8 square nut gr 8 b18.2.210
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BHAMALSquare NutSteelPlain5/8-11 x 35/8-11x3 sq antiro t-hd w/nut c111 b18.2.275
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AbabaCASquare Nut300 Stainless (A1,A2, 18-8,304,310 etc.)Plain#10-3210-32 sq nut s/s b18.2.21100
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AbabaCASquare NutSteelPlain1 1/8-71 1/8-7 sq nut stl pln b18.2.25
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AbabaCASquare NutSteelPlain1 1/4-71 1/4-7 sq nut stl pln b18.2.21
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AbabaCASquare NutSteelPlain1 1/2-61 1/2-6 sq nut stl pln b18.2.24
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AbabaCASquare Nut300 Stainless (A1,A2, 18-8,304,310 etc.)Plain1/4-201/4-20 sq nut s/s b18.2.210750
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AbabaCASquare NutSteelPlain1/4-201/4-20 sq nut stl pln b18.2.24175
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AbabaCASquare Nut300 Stainless (A1,A2, 18-8,304,310 etc.)Plain5/16-185/16-18 sq nut s/s b18.2.21684
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AbabaCASquare NutSteelPlain3/8-163/8-16 sq nut stl pln b18.2.21312
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AbabaCASquare NutSteelPlain1/2-131/2-13 sq nut stl pln b18.2.2863
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AbabaCASquare NutSteelPlain5/8-115/8-11 sq nut stl pln b18.2.2100
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AbabaCASquare Nut300 Stainless (A1,A2, 18-8,304,310 etc.)Plain#6-326-32 sq nut s/s b18.2.21080
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AbabaCASquare NutSteelPlain3/4-103/4-10 sq nut stl pln b18.2.212
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AbabaCASquare Nut300 Stainless (A1,A2, 18-8,304,310 etc.)Plain#10-2410-24 sq nut s/s b18.2.2200
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AbabaCASquare NutSteelPlain5/16-185/16-18 sq nut stl pln b18.2.2600
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ASMCILSquare NutGrade 8Plain1/2-13coarse gr8 regular square nut med carb b18.2.221
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AbabaCASquare Nut300 Stainless (A1,A2, 18-8,304,310 etc.)Plain#10-3210-32 sq nut s/s b18.2.2100
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AbabaCASquare Nut300 Stainless (A1,A2, 18-8,304,310 etc.)Plain1/4-201/4-20 sq nut s/s b18.2.2300
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AbabaCASquare NutSteelPlain3/8-163/8-16 sq nut stl pln b18.2.2300
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AbabaCASquare NutSteelPlain1/2-131/2-13 sq nut stl pln b18.2.2100
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AbabaCASquare NutSteelPlain5/8-115/8-11 sq nut stl pln b18.2.250
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Alma BoltMISquare NutSteelPlain7/8-97/8-9 square nut b18.2.2324
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Alma BoltMISquare NutSteelPlain1/2-131/2-13 plain finish square nut b18.2.22467
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SIIINSquare NutSteelPlain1-81-8 plain square nut b18.2.2125
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SIIINSquare NutGrade 2Plain3/4-103/4-10 square nuts grade 2 plain b18.2.2100
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SIIINSquare NutGrade APlain5/8-115/8-11 grade a plain finish steel regular square nut b18.2.246
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Wink FastVASquare Nut300 Stainless (A1,A2, 18-8,304,310 etc.)Plain#4-4018.8 (a2) 18-8 304 steel square nut 4-40 per asme/ansi b18.2.210237
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JET FITTINGCASquare NutSteelPlain1/2-131/2-13 heavy square nut steel plain 50NQHP b18.2.2163
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JET FITTINGCASquare NutGrade 2Plain5/8-115/8-11 sq nuts grade 2 pln ARS200625C b18.2.2400
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IRFNCSquare NutGrade 2Plain1 1/4-71-1/4-7 square nut grade 2 b18.2.2 sae j995 steel plain180
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StandardMASquare Nut316, 317, A4 StainlessPlain1/2-131/2-13 square nut 316 stainless steel b18.2.216640
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StandardMASquare NutBrassPlain1/2-131/2-13 square nut brass b18.2.28350
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StandardMASquare NutBrassPlain3/8-163/8-16 square nut brass b18.2.227432
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StandardMASquare NutBrassPlain5/16-185/16-18 square nut brass b18.2.211657
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StandardMASquare NutBrassPlain#6-326-32 square nut brass b18.2.2-16800
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StandardMASquare Nut316, 317, A4 StainlessPlain1/4-201/4-20 square nut 316 stainless steel b18.2.243450
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StandardMASquare Nut316, 317, A4 StainlessPlain#4-404/40 square nut 316 stainless steel b18.2.2121160
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StandardMASquare Nut300 Stainless (A1,A2, 18-8,304,310 etc.)Plain3/8-243/8-24 square nut 18-8 stainless steel b18.2.23121
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StandardMASquare NutBrassPlain#10-3210-32 square nut brass b18.2.28150
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StandardMASquare Nut300 Stainless (A1,A2, 18-8,304,310 etc.)Plain1/4-281/4-28 square nut 18-8 stainless steel b18.2.21890
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StandardMASquare Nut300 Stainless (A1,A2, 18-8,304,310 etc.)Plain7/16-147/16-14 square nut 18-8 stainless steel b18.2.21174
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StandardMASquare Nut316, 317, A4 StainlessPlain#10-3210-32 square nut 316 stainless steel b18.2.239050
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StandardMASquare NutBrassPlain#10-2410-24 square nut brass b18.2.29968
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StandardMASquare NutBrassPlain#4-404-40 square nut brass b18.2.219977
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StandardMASquare Nut300 Stainless (A1,A2, 18-8,304,310 etc.)Plain7/16-207/16-20 square nut 18-8 stainless steel b18.2.22829
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StandardMASquare Nut300 Stainless (A1,A2, 18-8,304,310 etc.)Plain#10-2410-24 square nut 18-8 stainless steel b18.2.246292
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StandardMASquare Nut316, 317, A4 StainlessPlain#8-328-32 square nut 316 stainless steel b18.2.2-69750
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StandardMASquare Nut316, 317, A4 StainlessPlain3/8-163/8-16 square nut 316 stainless steel b18.2.22710
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StandardMASquare Nut316, 317, A4 StainlessPlain5/16-185/16-18 square nut 316 stainless steel b18.2.292310
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QFCTXSquare NutSteelPlain3/4 x 6 1/23/4x6 1/2 t-o sb w/fin & sq nt b18.2.21164
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QFCTXSquare NutSteelPlain1/4-201/4-20 square nut a563 a plain finish b18.2.254
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QFCTXSquare NutSteelPlain5/165/16nc plain square nut 321032 b18.2.2152
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QFCTXSquare NutSteelPlain3/8-163/8-16 square nut plain b18.2.2900
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QFCTXSquare NutSteelPlain3/8-163/8-16 square nut plain b18.2.2186
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QFCTXSquare NutSteelPlain3/8-163/8-16 square nut plain b18.2.2704
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QFCTXSquare NutSteelPlain1/2-131/2-13 square nut plain b18.2.240
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QFCTXSquare NutSteelPlain1/2-131/2-13 square nut plain b18.2.23000
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QFCTXSquare NutGrade 5Plain1/2-131/2-13 hvy square nut grade 5 plain b18.2.236
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QFCTXSquare NutSteelPlain1/2-131/2-13 sq nut overtapped .021 plain b18.2.2490
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QFCTXSquare NutSteelPlain3/4-103/4-10 square nut plain tap oversized b18.2.2203
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QFCTXSquare NutSteelPlain3/4-103/4-10 square nut plain tap oversized b18.2.2601
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QFCTXSquare NutSteelPlain3/4-103/4-10 square nut plain tap oversized b18.2.21410
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QFCTXSquare NutSteelPlain1-81-8 square nut plain b18.2.225
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QFCTXSquare Nut300 Stainless (A1,A2, 18-8,304,310 etc.)Plain#10-2410-24 square nut 304 18-8 304 steel b18.2.2216
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QFCTXSquare Nut300 Stainless (A1,A2, 18-8,304,310 etc.)Plain1/2-131/2-13 square nut 18-8 s/s b18.2.25935
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QFCTXSquare Nut300 Stainless (A1,A2, 18-8,304,310 etc.)Plain1/2-131/2-13 square nut 18-8 s/s b18.2.2386
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QFCTXSquare Nut300 Stainless (A1,A2, 18-8,304,310 etc.)Plain1/2-131/2-13 square nut 18-8 s/s domestic b18.2.2230
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QFCTXSquare NutSteelPlain1/2-131/2-13 square nut tapped oversize plain b18.2.21150
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QFCTXSquare NutSteelPlain1/2-131/2-13 square nut tapped oversize plain finish domestic b18.2.221
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B & K FASTPASquare NutAluminumPlain1/4-201/4-20 aluminum square nuts b18.2.2500
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B & K FASTPASquare NutSteelPlain1/2-131/2-13 heavy square nuts plain b18.2.2131
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B & K FASTPASquare NutSteelPlain1-81-8 heavy square nuts plain b18.2.23
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B & K FASTPASquare NutSteelPlain1 1/8-71 1/8-7 heavy square nuts plain b18.2.21
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B & K FASTPASquare NutSteelPlain1 1/41 1/4 heavy square nuts plain b18.2.254
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B & K FASTPASquare NutSteelPlain2-4 1/22-4 1/2 heavy square nuts plain b18.2.29
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B & K FASTPASquare NutSteelPlain3/4-103/4-10 l.h. square nuts plain b18.2.2298
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B & K FASTPASquare NutSteelPlain#5-405/40 square nuts plain b18.2.23800
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B & K FASTPASquare NutSteelPlain1/4-201/4-20 square nuts plain b18.2.21200
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B & K FASTPASquare NutSteelPlain5/16-185/16-18 square nuts plain b18.2.246832
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B & K FASTPASquare NutSteelPlain3/8-163/8-16 square nuts plain b18.2.2304
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B & K FASTPASquare NutSteelPlain7/16-147/16-14 square nuts plain b18.2.226296
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B & K FASTPASquare NutSteelPlain1/2-131/2-13 square nuts plain b18.2.21583
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B & K FASTPASquare NutSteelPlain5/8-115/8-11 square nuts plain b18.2.2933
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B & K FASTPASquare NutSteelPlain3/4-103/4-10 square nuts plain b18.2.2230
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B & K FASTPASquare NutSteelPlain7/8-97/8-9 square nuts plain b18.2.21744
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B & K FASTPASquare NutGrade 8Plain9/16-189/16-18 square track nuts gr 8 plain b18.2.224
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B & K FASTPASquare Nut300 Stainless (A1,A2, 18-8,304,310 etc.)Plain1/2-13 11/161/2-13 square nuts stainless 11/16 thk b18.2.24325
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BHAMGASquare NutGrade 2Plain1 x a1831 a183 grade 2 square nuts b18.2.270
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BHAMGASquare NutSteelPlain3/43/4 4140 square nuts b18.2.291
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BHAMGASquare NutSteelPlain1 3/81 3/8 4140 square nuts b18.2.216
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BHAMGASquare NutGrade 2HPlain1 3/81 3/8 a194-2h square nuts b18.2.233
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IRFNJSquare NutGrade 2Plain1 1/4-71-1/4-7 square nut grade 2 b18.2.2 sae j995 steel plain180
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Marine FastenersFLSquare Nut300 Stainless (A1,A2, 18-8,304,310 etc.)Plain5/16-185/16-18 square nut ss b18.2.263700
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Marine FastenersFLSquare Nut300 Stainless (A1,A2, 18-8,304,310 etc.)Plain#10-3210-32 square nut ss w/chamfer b18.2.2118000
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Marine FastenersFLSquare NutAluminumPlain#10-2410-24 square nut aluminum per print rev 1 b18.2.225950
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Marine FastenersFLSquare Nut300 Stainless (A1,A2, 18-8,304,310 etc.)Plain#4-404-40 square nut ss w/chamfer b18.2.277400
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Marine FastenersFLSquare Nut300 Stainless (A1,A2, 18-8,304,310 etc.)Plain#10-2410-24 square nut 18-8ss per print rev c b18.2.215220
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Marine FastenersFLSquare Nut316, 317, A4 StainlessPlain20-20 square nut 316 stainless b18.2.29200
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General FMISquare NutGrade 2Plain1/2-131/2-13 hvy sq nut gr 2 b18.2.21241
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General FMISquare Nut300 Stainless (A1,A2, 18-8,304,310 etc.)Plain#10-24#10-24 sst square nut b18.2.220500
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BHAMALSquare Nut300 Stainless (A1,A2, 18-8,304,310 etc.)Plain5/16-185/16-18 sq nut 300 ser ss b18.2.215
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BHAMALSquare Nut300 Stainless (A1,A2, 18-8,304,310 etc.)Plain#10-3210-32 square nut 300 ser ss b18.2.2191
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OSSCORISquare NutSteelPlain#10-3210-32 square nut b18.2.22,247
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OSSCORISquare NutSteelPlain1 1/8-71 1/8-7 square nut b18.2.271
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OSSCORISquare NutSteelPlain5/16-185/16-18 square nut b18.2.24,567
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OSSCORISquare NutSteelPlain7/8-97/8-9 square nut b18.2.238
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OSSCORISquare NutSteelPlain#8-328-32 square nut b18.2.29,065
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OSSCORISquare NutSteelPlain5/8-115/8-11 square nut b18.2.21,096
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QFCTXSquare Nut300 Stainless (A1,A2, 18-8,304,310 etc.)Plain1/4-201/4-20 square nut single chamfer 304 s/s b18.2.2198
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QFCTXSquare Nut300 Stainless (A1,A2, 18-8,304,310 etc.)Plain3/8-163/8-16 square nut 18-8 ss b18.2.280
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QFCTXSquare NutSteelPlain3/4-103/4-10 square nut b18.2.2800
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QFCTXSquare NutSteelPlain3/4-103/4-10 heavy square nut plain finish b18.2.2111
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QFCTXSquare Nut300 Stainless (A1,A2, 18-8,304,310 etc.)Plain5/165/16nc square nut st/st b18.2.260
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QFCTXSquare Nut300 Stainless (A1,A2, 18-8,304,310 etc.)Plain#10-2410/24 square nut 18-8ss b18.2.2510
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PerigeeMISquare NutSteelPlain3/4-10 x 1 1/8 x 21/323/4-10 x 1-1/8 x 21/32 square nut b18.2.2485
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PerigeeMISquare NutSteelPlain5/8-11 x 1 x 35/645/8-11 x 1 x 35/64 square nut b18.2.233
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PerigeeMISquare NutGrade APlain1/2-13 x 13/16 x 7/161/2-13 x 13/16 x 7/16 regular square nut b18.2.292
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JET FITTINGCASquare NutSteelPlain3/816nut square 3/816 steel plain b18.2.2900
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THRDFASTFLSquare NutSteelPlain1/4-20square nut b18.2.26,425
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THRDFASTFLSquare NutSteelPlain3/8-16square nut b18.2.21,460
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THRDFASTFLSquare NutSteelPlain1 1/4-7square nut b18.2.220
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THRDFASTOKSquare NutSteelPlain5/8-11square nut b18.2.2173
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THRDFASTTNSquare NutSteelPlain3/4-10square nut b18.2.256
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THRDFASTTNSquare NutSteelPlain1/2-13square nut b18.2.250
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THRDFASTALSquare NutSteelPlain7/8-9square nut b18.2.2200
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THRDFASTALSquare NutSteelPlain1/2-13square nut b18.2.246
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THRDFASTMSSquare NutSteelPlain3/4-10square nut b18.2.210
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THRDFASTMSSquare NutSteelPlain#4 sq base red silcone b18.2.29
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THRDFASTMSSquare NutSteelPlain#4 sq base red silcone hi temp b18.2.227
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THRDFASTMSSquare NutRubber, Buna-N, Neoprene etc.Plain#1sq black epdm retro fit b18.2.24
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THRDFASTMSSquare NutRubber, Buna-N, Neoprene etc.Plain#3 sq base black-epdm flash b18.2.27
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THRDFASTMSSquare NutRubber, Buna-N, Neoprene etc.Plain#5 sq base black-epdm flash b18.2.250
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KBSTNSquare NutGrade 5Plain1-81-8 heavy square nut gr 5 b18.2.2182
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KBSTNSquare NutSilicon BronzePlain1/2-131/2-13 regular squarenut sili brze b18.2.2446
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KBSTNSquare Nut300 Stainless (A1,A2, 18-8,304,310 etc.)Plain5/8-115/8-11 regular squarenut s/s b18.2.250
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KBSTNSquare NutSteelPlain9/16-189/16-18 sq track nut b18.2.2100
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KBSTNSquare NutSteelPlain3/4-163/4-16 sq track nut b18.2.2198
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KBSTNSquare NutSteelPlain1 3/4-51-3/4-5 heavy square nut b18.2.252
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KBSTNSquare Nut300 Stainless (A1,A2, 18-8,304,310 etc.)Plain3/8-163/8-16 regular squarenut s/s b18.2.21,735
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KBSTNSquare NutSteelPlain2 1/4-4 1/22 1/4-4.5 heavy square nut b18.2.224
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KBSTNSquare Nut300 Stainless (A1,A2, 18-8,304,310 etc.)Plain1/2-131/2-13 regular squarenut s/s b18.2.21,182
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KBSTNSquare NutBrassPlain1/2-131/2-13 regular squarenut brass b18.2.22,986
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KBSTNSquare NutBrassPlain3/8-163/8-16 regular squarenut brass b18.2.21,725
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THRDFASTFLSquare NutSteelPlain3/8-16heavy square nut b18.2.2233
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THRDFASTFLSquare NutSteelPlain5/8-11square nut b18.2.217
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THRDFASTOKSquare NutSteelPlain3/8-16square nut b18.2.2230
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THRDFASTALSquare NutSteelPlain7/8-9square nut b18.2.2155
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THRDFASTOKSquare NutSteelPlain5/8-11square nut tapped .02 oversize b18.2.21
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THRDFASTALSquare NutSteelPlain1/2-13square nut b18.2.210
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THRDFASTALSquare NutSteelPlain1 1/2-6square nut b18.2.281
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THRDFASTFLSquare NutSteelPlain7/8-9square nut b18.2.250
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THRDFASTOKSquare NutGrade 2HPlain1 3/4-82h hvy hex nut w/.0025 squareness tolerance b18.2.2115
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THRDFASTMSSquare NutSteelPlain1-8square nut b18.2.238
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THRDFASTALSquare Nut300 Stainless (A1,A2, 18-8,304,310 etc.)Plain5/16-1818-8 ss square nut b18.2.214
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THRDFASTALSquare NutSteelPlain1 1/8-7square nut b18.2.232
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THRDFASTFLSquare NutSteelPlain3/4-10heavy square nut b18.2.252
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THRDFASTALSquare NutSteelPlain1 1/4-7square nut b18.2.2158
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WSBKYSquare NutGrade 2Plain1-8nut sq gr2 (pl) 1-8 b18.2.21,750
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All SizeTXSquare NutSteelPlain1/4-201/4-20 square nut b18.2.24,503
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All SizeTXSquare NutSteelPlain3/4-103/4-10 square nut plain b18.2.2227
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All SizeTXSquare NutSteelPlain#8-328-32 square nut b18.2.210,800
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All SizeTXSquare NutSteelPlain7/8-97/8-9 square nut b18.2.273
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