3/8-16 Square Head Bolts

Square Head Bolts were once the most common form of bolt, until they were replaced by hex head bolts. They are covered under ANSI Standard B18.2.1 and are now most commonly used for aesthetic purposes to provide a rustic look .

3,146 Square Head Bolt, showing 200, (click on any line for more information)

Buy Square Head Bolts from one of our FCH Network Partners
SupplierLocTypeMaterialFinishSizeDescriptionQty 
Zoro Tools Inc.Square Head BoltSteelPlain3/8-163/8-16 carbon steel square bolt die
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Buy Square Head Bolts from one of our FCH Network Members
B & K FASTPASquare Head BoltSteelPlain3/8-16 x 1 1/43/8-16 x 1 1/4 square bolts plain b18.2.16
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B & K FASTPASquare Head BoltSteelZinc/Clear3/8-16 x 1 1/43/8-16 x 1 1/4 square bolts zinc b18.2.1854
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B & K FASTPASquare Head BoltSteelPlain3/8-16 x 23/8-16 x 2 square bolts plain b18.2.1217
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B & K FASTPASquare Head BoltSteelPlain3/8-16 x 7 1/23/8-16 x 7 1/2 square bolts plain b18.2.162
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BHAMALSquare Head BoltGrade 5Zinc/Clear3/8-16 x 1 3/43/8-16 x 1 3/4 sq hd m/bolt gr 5 zn b18.2.1829
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BHAMALSquare Head BoltSteelGalvanized3/8-16 x 43/8-16 x 4 square head bolt hdg b18.2.143
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AmericanNYSquare Head BoltSteelZinc/Clear3/8-16 x 6square m/b zp44
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AmericanNYSquare Head BoltSteelBlack Oxide3/8-16 x 2square hd m/b black ox2380
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AmericanNYSquare Head BoltSteelZinc/Clear3/8-16 x 2 1/4square hd m/b pl500
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AmericanNYSquare Head BoltSteelZinc/Yellow3/8-16 x 2 1/2square hd m/b zy1000
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AmericanNYSquare Head BoltSteelPlain3/8-16 x 4 1/2square m/b50
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AmericanNYSquare Head BoltSteelBlack Oxide3/8-16 x 4 1/2square hd m/b black ox10
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AmericanNYSquare Head BoltSteelPlain3/8-16 x 3 1/2square bolt150
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AmericanNYSquare Head BoltSteelPlain3/8-16 x 5square m/b630
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AmericanNYSquare Head BoltSteelZinc/Clear3/8-16 x 2 1/4square m/s bolt pl1800
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AmericanNYSquare Head BoltSteelPlain3/8-16 x 2 1/4square hd bolt2100
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AmericanNYSquare Head BoltSteelZinc/Clear3/8-16 x 1 1/43/8-16 x 1-1/4 square machine bolt zinc plate300
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ZAL INDUSCASquare Head BoltSteelPlain3/8-16 x 3 1/23/8-16 x 3 1/2 sq hd mach bolt200
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ZAL INDUSCASquare Head BoltSteelPlain3/8-16 x 1 1/43/8-16 x 1 1/4 sq hd mach bolt299
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ZAL INDUSCASquare Head BoltSteelPlain3/8-16 x 1 1/23/8-16 x 1 1/2 sq hd mach bolt225
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ZAL INDUSCASquare Head BoltSteelZinc/Clear3/8-16 x 23/8-16 x 2 sq hd mach bolt pltd186
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YANKEENHSquare Head BoltSteelPlain3/8-16 x 43/8-16 x 4 square hd bolt364
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EndriesWISquare Head BoltSteelZinc/Clear3/8-16 x 2 1/23/8-16x2-1/2 square head machine bolt full thread zinc1717
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EndriesWISquare Head Bolt300 Stainless (A1,A2, 18-8,304,310 etc.)Plain3/8-16 x 2 1/23/8-16x2-1/2 18-8 stainless steel square head machine bolt full thread2018
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EndriesWISquare Head Bolt300 Stainless (A1,A2, 18-8,304,310 etc.)Plain3/8-16 x 43/8-16x4 stainless steel square head machine bolt48
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MESAFASTCASquare Head BoltSteelZinc/Clear3/8-16 x 1 1/2square bolt24.0
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MESAFASTCASquare Head BoltSteelZinc/Clear3/8-16 x 4 1/2square bolt93.0
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MESAFASTCASquare Head BoltSteelZinc/Clear3/8-16 x 2square bolt596.0
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ACCURATEILSquare Head BoltSteelZinc/Clear3/8-16 x 2 1/4bolt square machine f/t932
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ACCURATEILSquare Head BoltSteelZinc/Clear3/8-16 x 5 1/2bolt square machine1100
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ACCURATEILSquare Head BoltSteelZinc/Clear3/8-16 x 2 3/4bolt square machine750
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ACCURATEILSquare Head BoltSteelPlain3/8-16 x 2 3/4bolt square machine300
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ACCURATEILSquare Head BoltSteelZinc/Clear3/8-16 x 1 1/4bolt square machine34
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ACCURATEILSquare Head BoltSteelZinc/Clear3/8-16 x 1 1/2bolt square mach f/t34122
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ACCURATEILSquare Head BoltSteelZinc/Clear3/8-16 x 2bolt square machine f/t285
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ACCURATEILSquare Head BoltSteelPlain3/8-16 x 2 1/2bolt square machine1350
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ACCURATEILSquare Head BoltSteelZinc/Clear3/8-16 x 3bolt square machine f/t 3/8 blank320
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ACCURATEILSquare Head BoltSteelPlain3/8-16 x 4bolt square machine17
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ACCURATEILSquare Head BoltSteelPlain3/8-16 x 6bolt square machine (5 1/2 inches thread)242
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ACCURATEILSquare Head BoltSteelZinc/Clear3/8-16 x 7/8bolt square machine48700
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ACCURATEILSquare Head BoltSteelPlain3/8-16 x 8 1/2bolt square machine39
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ACCURATEILSquare Head BoltSteelZinc/Clear3/8-16 x 4 1/2bolt square machine400
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ACCURATEILSquare Head BoltSteelZinc/Clear3/8-16 x 1bolt square machine15501
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ACCURATEILSquare Head BoltSteelPlain3/8-16 x 1 3/4bolt square machine6000
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Purchase MOSquare Head BoltSteelZinc/Clear3/8-16 x 2 1/43/8-16 x 2 1/4 square hd bolt zinc313
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ASMCILSquare Head BoltGrade AGalvanized3/8-16 x 4a307 gra square hd m/b low carb hdg b18.2.1275
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ASMCILSquare Head BoltGrade AZinc/Clear3/8-16 x 1 1/43/8-16x1 1/4 a307 gra square hd machine bolt low carb zp600
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ASMCILSquare Head BoltGrade APlain3/8-16 x 63/8-16x6 (pt) coarse a307 gra square hd machine bolt low carb pln unc100
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ASMCILSquare Head BoltGrade AGalvanized3/8-16 x 1a307 gra square hd m/b low carb hdg21
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ASMCILSquare Head BoltGrade AGalvanized3/8-16 x 1 1/4a307 gra square hd m/b low carb hdg450
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ASMCILSquare Head BoltGrade AGalvanized3/8-16 x 1 1/2a307 gra square hd m/b low carb hdg200
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ASMCILSquare Head BoltGrade AGalvanized3/8-16 x 6a307 gra square hd m/b low carb hdg250
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ASMCILSquare Head BoltGrade AZinc/Clear3/8-16 x 6a307 gra square hd m/b low carb zp175
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ASMCILSquare Head BoltGrade APlain3/8-16 x 1 1/2(pt) coarse a307 gra square hd m/b low carb100
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ASMCILSquare Head BoltGrade APlain3/8-16 x 1(ft) coarse a307 gra square hd m/b low carb250
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ASMCILSquare Head BoltGrade AZinc/Clear3/8-16 x 1 1/2a307 gra square hd m/b low carb zp b18.2.1750
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ASMCILSquare Head BoltGrade AGalvanized3/8-16 x 3a307 gra square hd m/b low carb hdg b18.2.1350
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ASMCILSquare Head BoltGrade APlain3/8-16 x 2(pt) coarse a307 gra square hd m/b low carb250
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AbabaCASquare Head BoltSteelPlain3/8-16 x 5 1/23/8-16 x 5-1/2 sq hd bolt steel pln b18.2.1189
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AbabaCASquare Head BoltSteelPlain3/8-16 x 2 1/23/8-16 x 2 1/2 sq hd bolt steel pln b18.2.11
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ScrewsIncOHSquare Head BoltSteelPlain3/8-16 x 1 1/4500
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LippinCASquare Head BoltSteelPlain3/8-16 x 1square head bolt plain820
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JacksonMSSquare Head BoltGrade 2Zinc/Clear3/8-16 x 33/8-16 x 3 square head bolt gr. 2 zinc plated503
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Future FastenerTXSquare Head BoltSteelGalvanized3/8-16 x 3/43/8-16 x 3/4 square head bolt galv1,600
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Future FastenerTXSquare Head BoltSteelGalvanized3/8-16 x 3 1/23/8-16 x 3 1/2 sq hd machine bolt galv.
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JacksonMSSquare Head BoltGr ade 2Galvanized3/8-16 x 2 1/2square bolt hdg295
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JacksonMSSquare Head BoltGrade 2Plain3/8-16 x 1 1/4square bolt gr. 22445
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TownCountryARSquare Head BoltSteelZinc/Clear3/8-16 x 13/8-16 x 1 square head machine bolt zincinquire
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JET FITTINGCASquare Head BoltGrade APlain3/8-16 x 1 3/43/8-16x1-3/4 (pt) square bolt steel a307 plain b18.2.1250
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JET FITTINGCASquare Head BoltGrade APlain3/8-16 x 2 3/43/8-16x2 3/4 (pt) bolts square head bolts a307 grade a square head bolt plain (inch) b18.2.1400
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JET FITTINGCASquare Head BoltGrade APlain3/8-16 x 53/8-16x5 (pt) bolts square head bolts a307 grade a square head bolt plain (inch) b18.2.1150
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QFCTXSquare Head BoltGrade 2Zinc/Clear3/8-16 x 13/8-16x1 sq head bolt gr2 zinc b18.2.170
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SRFALSquare Head BoltGrade 2Galvanized3/8-16 x 2 1/2square hd bolt1,434
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SRFALSquare Head BoltGrade 2Plain3/8-16 x 3 1/2square hd bolt38
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SRFALSquare Head BoltGrade 2Plain3/8-16 x 4 1/4square hd bolt398
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SRFALSquare Head BoltGrade 2Plain3/8-16 x 5square hd bolt25
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SRFALSquare Head BoltGrade 2Zinc/Clear3/8-16 x 5square hd bolt14
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SRFALSquare Head BoltGrade 2Plain3/8-16 x 6square hd bolt25
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SRFALSquare Head BoltGrade 2Plain3/8-16 x 3/4square hd bolt-
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SRFALSquare Head BoltGrade 2Zinc/Clear3/8-16 x 7/8square hd bolt441
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SRFALSquare Head BoltGrade 2Galvanized3/8-16 x 1square hd bolt10
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SRFALSquare Head BoltGrade 2Zinc/Clear3/8-16 x 1 1/2square hd bolt88
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SRFALSquare Head BoltGrade 2Plain3/8-16 x 2square hd bolt-
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RCFastAZSquare Head BoltGrade 5Plain3/8-16 x 1/2per print (bolt, sq hd, gr5, l.h., smoothface, )inquire
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HodellOHSquare Head BoltSteelGalvanized3/8-16 x 1 1/43/8-16 x 1 1/4 square hd mach bolt hdg300
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HodellOHSquare Head BoltSteelGalvanized3/8-16 x 13/8-16 x 1 square head machine bolt hdg83
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HodellOHSquare Head BoltSteelGalvanized3/8-16 x 1 1/23/8-16 x 1 1/2 square hd mach bolt hdg400
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BHAMTXSquare Head BoltSteelGalvanized3/8-16 x 1 3/4square hdg8,203
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BHAMTXSquare Head BoltGrade AGalvanized3/8-16 x 4 1/2a307 square hd mach bolt hdg257
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ASFCORPMISquare Head BoltGrade AZinc/Clear3/8-16 x 3 1/23/8-16 x 3 1/2 sq hd blt a307 gr a tri zn fe/zn 5an340
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BIG BOLTILSquare Head BoltGrade 5Plain3/8-16 x 12bolt & c/s square boltsquare b18.2.1500
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BIG BOLTILSquare Head BoltGrade 5Plain3/8-16 x 4bolt & c/s square boltsquare b18.2.1500
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BIG BOLTILSquare Head BoltGrade 8Plain3/8-16 x 10bolt & c/s square boltsquare b18.2.1500
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BIG BOLTILSquare Head BoltGrade 5Plain3/8-16 x 10bolt & c/s square boltsquare b18.2.1500
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BIG BOLTILSquare Head BoltGrade 5Plain3/8-16 x 16bolt & c/s square boltsquare b18.2.1500
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BIG BOLTILSquare Head BoltSteelPlain3/8-16 x 4 1/4bolt & c/s square boltsquare b18.2.12582
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BIG BOLTILSquare Head BoltGrade 5Plain3/8-16 x 1 1/2bolt & c/s square boltsquare b18.2.13100
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BIG BOLTILSquare Head BoltGrade 8Plain3/8-16 x 6bolt & c/s square boltsquare b18.2.1500
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BIG BOLTILSquare Head BoltGrade 8Plain3/8-16 x 8bolt & c/s square boltsquare b18.2.1500
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BIG BOLTILSquare Head BoltGrade 5Plain3/8-16 x 2 1/4bolt & c/s square boltsquare b18.2.112000
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BIG BOLTILSquare Head BoltGrade 5Plain3/8-16 x 8bolt & c/s square boltsquare b18.2.1500
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BIG BOLTILSquare Head BoltGrade 5Plain3/8-16 x 2bolt & c/s square boltsquare b18.2.12600
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BIG BOLTILSquare Head BoltGrade 5Plain3/8-16 x 1bolt & c/s square boltsquare b18.2.15000
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BIG BOLTILSquare Head BoltGrade 5Plain3/8-16 x 6bolt & c/s square boltsquare b18.2.13800
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OBRIENOHSquare Head BoltSteelPlain3/8-16 x 2 1/2square hd bolt338
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OBRIENOHSquare Head BoltSteelPlain3/8-16 x 1 1/4square hd bolt275
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OBRIENOHSquare Head BoltSteelPlain3/8-16 x 1square hd mach bolt750
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MidStatesMISquare Head BoltGrade 2Plain3/8-16 x 3 3/4square hd bolt49
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MidStatesMISquare Head BoltGrade 2Plain3/8-16 x 5 1/23/8-16x5-1/2 square hd bolt132
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THRDFASTFLSquare Head BoltSteelGalvanized3/8-16 x 11square hd bolt hdg b18.2.1108
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THRDFASTFLSquare Head BoltGrade 5Plain3/8-16 x 2gr5 square hd bolt b18.2.110
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THRDFASTFLSquare Head BoltSteelPlain3/8-16 x 2 1/2square hd bolt b18.2.13
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THRDFASTTNSquare Head BoltSteelGalvanized3/8-16 x 4square hd bolt hdg b18.2.1174
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THRDFASTALSquare Head BoltSteelGalvanized3/8-16 x 1square hd bolt hdg b18.2.115
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KBSTNSquare Head BoltSteelPlain3/8-16 x 1 1/23/8-16 x 1 1/2 square hd mach.bolt b18.2.12,048
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WSBKYSquare Head BoltSteelPlain3/8-16 x 1 1/4blt sqr sbrz (pl) 3/8-16x1 1/4 b18.2.1682
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LibertyILSquare Head BoltSteelZinc/Clear3/8-16 x 1 1/4square m/b machine bolt200
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LibertyILSquare Head BoltBrassPlain3/8-16 x 2square hd m/b brass1,500
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LibertyILSquare Head BoltSteelZinc/Clear3/8-16 x 3 1/2square m/b 1 tl poor m/b 1 tl poor840
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LibertyILSquare Head BoltSteelZinc/Yellow3/8-16 x 7 1/2square mac hine bolt 1 1/2tl & yel hine bolt 1 1/2tl & yel89
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LibertyILSquare Head BoltSteelPlain3/8-16 x 11square m/b 1 5/8 tl &rust m/b 1 5/8 tl &rust226
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LibertyILSquare Head BoltSteelPlain3/8-16 x 2square m/b 1 1/2tl bolt 1 1/2tl250
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LibertyILSquare Head BoltSteelPlain3/8-16 x 1 3/4square m/b machine bolt720
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LibertyILSquare Head BoltSteelZinc/Clear3/8-16 x 1square m/b machine bolt600
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LibertyILSquare Head BoltSteelZinc/Clear3/8-16 x 3 1/2square m/b f/t559
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LibertyILSquare Head BoltSteelPlain3/8-16 x 15square m/b 1 7/8 tl poor zi m/b 1 7/8 tl poor zi410
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LibertyILSquare Head BoltSteelZinc/Clear3/8-16 x 3 1/2square m/b machine bolt449
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LibertyILSquare Head BoltSteelPlain3/8-16 x 4square m/b 1 9/16tl bolt 1 9/16tl297
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LibertyILSquare Head BoltSteelZinc/Clear3/8-16 x 2 1/2square m/b no mark m/b no mark967
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LibertyILSquare Head BoltSteelZinc/Clear3/8-16 x 7 1/2square mac hine bolt 1 1/2tl poor hine bolt 1 1/2tl poor804
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LibertyILSquare Head BoltSteelZinc/Yellow3/8-16 x 4 1/4square m/b & machine bolt &90
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LibertyILSquare Head BoltSteelZinc/Yellow3/8-16 x 3 1/2square m/b & machine bolt &100
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ISSCOMOSquare Head BoltGrade 2Plain3/8-16 x 3 1/21600
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ISSCOMOSquare Head BoltGrade 2Plain3/8-16 x 4650
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ISSCOMOSquare Head BoltGrade 2Plain3/8-16 x 7 1/26080
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ISSCOMOSquare Head BoltGrade 2Zinc/Clear3/8-16 x 1 1/22050
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ISSCOMOSquare Head BoltGrade 2Plain3/8-16 x 33495
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GUIDONNJSquare Head BoltGrade 2Black Oxide3/8-16 x 3A307A450
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MFSKSSquare Head BoltGrade 2Zinc/Yellow3/8-16 x 1square25
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MFSKSSquare Head BoltGrade 2Plain3/8-16 x 11/2square40
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XL ScrewGASquare Head BoltSteelPlain3/8-16 x 3f/t square hd m/b astm a307350
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XL ScrewGASquare Head BoltSteelPlain3/8-16 x 1f/t square hd m/b astm a307800
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XL ScrewGASquare Head BoltSteelPlain3/8-16 x 1 3/4f/t square hd m/b astm a307600
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XL ScrewGASquare Head BoltSteelPlain3/8-16 x 2f/t square hd m/b astm a307500
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XL ScrewGASquare Head BoltSteelPlain3/8-16 x 1 1/4f/t square hd m/b astm a307700
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XL ScrewGASquare Head BoltSteelPlain3/8-16 x 1 1/4square m/b std thrd fsb astm a307700
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XL ScrewGASquare Head BoltSteelPlain3/8-16 x 2square m/b std thrd fsb astm a307500
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XL ScrewGASquare Head BoltSteelPlain3/8-16 x 1 1/2square m/b std thrd fsb astm a307650
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XL ScrewGASquare Head BoltSteelPlain3/8-16 x 1 3/4square m/b std thrd fsb astm a307600
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XL ScrewGASquare Head BoltSteelPlain3/8-16 x 2 1/2square m/b std thrd fsb astm a307450
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XL ScrewGASquare Head BoltSteelPlain3/8-16 x 4 1/2square m/b std thrd fsb astm a307250
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XL ScrewGASquare Head BoltSteelPlain3/8-16 x 3square m/b std thrd fsb astm a307350
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XL ScrewGASquare Head BoltSteelPlain3/8-16 x 4square m/b std thrd fsb astm a307250
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XL ScrewGASquare Head BoltSteelPlain3/8-16 x 6square m/b std thrd fsb astm a307150
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XL ScrewGASquare Head BoltSteelPlain3/8-16 x 5 1/2square m/b std thrd fsb astm a307200
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XL ScrewGASquare Head BoltSteelPlain3/8-16 x 3 1/2square m/b std thrd fsb astm a307300
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ASMCILSquare Head BoltGrade AZinc/Clear3/8-16 x 2a307 gra square hd m/b low carb zp350
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ASMCILSquare Head BoltGrade AZinc/Clear3/8-16 x 1 1/2a307 gra square hd m/b low carb zp b18.2.1900
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ASMCILSquare Head BoltGrade AGalvanized3/8-16 x 3a307 gra square hd m/b low carb hdg b18.2.1450
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MasFasCorpNVSquare Head BoltSteelPlain3/8-16 x 1square m/s boltinquire
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GLFOHSquare Head BoltGrade 2Plain3/8-16 x 3square hd bolt stl268
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Kanebridge ILSquare Head BoltSteelPlain3/8-16 x 13/8-16x1 square machine bolt plain15,000
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Kanebridge ILSquare Head BoltSteelPlain3/8-16 x 1 1/43/8-16x1 1/4 square machine bolt plain12.500
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Kanebridge ILSquare Head BoltSteelPlain3/8-16 x 1 1/23/8-16x1 1/2 square machine bolt plain12.500
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Kanebridge ILSquare Head BoltSteelPlain3/8-16 x 23/8-16x2 square machine bolt plain10,000
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Kanebridge ILSquare Head BoltSteelPlain3/8-16 x 2 1/23/8-16x2 1/2 square machine bolt plain7.500
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Kanebridge ILSquare Head BoltSteelPlain3/8-16 x 2 1/43/8-16x2 1/4 square machine bolt plain7.500
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Kanebridge ILSquare Head BoltSteelPlain3/8-16 x 33/8-16x3 square machine bolt plain6.250
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Kanebridge ILSquare Head BoltSteelPlain3/8-16 x 3 1/23/8-16x3 1/2 square machine bolt plain5,000
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Kanebridge ILSquare Head BoltSteelPlain3/8-16 x 2 3/43/8-16x2 3/4 square machine bolt plain7.500
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KomarILSquare Head BoltSteelPlain3/8-16 x 3/4square hd m/b1,500
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KomarILSquare Head BoltSteelZinc/Clear3/8-16 x 3 1/2square hd m/b1,100
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KomarILSquare Head BoltSteelPlain3/8-16 x 1square hd m/b400
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KomarTNSquare Head BoltSteelZinc/Clear3/8-16 x 4inside-sq ublt (3 1/8bl)2thd126
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MtrcSpecCASquare Head BoltSteelPlain3/8-16 x 1 1/4square hd blt boltstock
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FasSpcMfgFLSquare Head Bolt300 Stainless (A1,A2, 18-8,304,310 etc.)Plain3/8-16 x 2 1/2square m/b 18-8 s/s1
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FasSpcMfgFLSquare Head Bolt300 Stainless (A1,A2, 18-8,304,310 etc.)Plain3/8-16 x 1 1/2square m/b 18-8 s/s5
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FMPMASquare Head BoltSteelZinc/Clear3/8-16 x 1 3/4square bolt151
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FMPMASquare Head BoltSteelZinc/Clear3/8-16 x 1square bolt455
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Alma BoltMISquare Head BoltGrade 2Plain3/8-16 x 1 1/2square bolt390
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Alma BoltMISquare Head BoltGrade 2Plain3/8-16 x 1 1/4square bolt633
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Alma BoltMISquare Head BoltGrade 2Plain3/8-16 x 1 3/4square bolt363
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Alma BoltMISquare Head BoltGrade 2Plain3/8-16 x 3 1/2square bolt317
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QFSMISquare Head Bolt300 Stainless (A1,A2, 18-8,304,310 etc.)Plain3/8-16 x 1 1/4Square head set screw cup point STAINLESS STEEL17
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QFSMISquare Head Bolt300 Stainless (A1,A2, 18-8,304,310 etc.)Plain3/8-16 x 1 1/2Square head set screw cup point STAINLESS STEEL48
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QFSMISquare Head Bolt300 Stainless (A1,A2, 18-8,304,310 etc.)Plain3/8-16 x 2 1/4Square head set screw cup point STAINLESS STEEL5
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QFSMISquare Head Bolt300 Stainless (A1,A2, 18-8,304,310 etc.)Plain3/8-16 x 2Square head set screw cup point STAINLESS STEEL400
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QFSMISquare Head Bolt300 Stainless (A1,A2, 18-8,304,310 etc.)Plain3/8-16 x 4Square head set screw cup point STAINLESS STEEL75
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