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Square Head Bolts, Plain (ASME B18. 2.1)

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 .

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SupplierLocTypeMaterialFinishSizeDescriptionQty 
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 BoltSteelPlain1/2-13 x 41/2-13 x 4 sq hd bolt steel pln b18.2.11
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AbabaCASquare Head BoltGrade 8Plain3/4-10 x 2 1/23/4-10 x 2-1/2 square head bolt gr.8 plain b18.2.120
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AbabaCASquare Head BoltSteelPlain1/4-20 x 1 1/21/4-20 x 1 1/2 sq hd blt steel pln b18.2.1200
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GLFOHSquare Head BoltGrade APlain3/8-16 x 33/8-16x3 square hd bolt a307 stl pln b18.2.1 () () ()28
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GLFOHSquare Head BoltSteelPlain3/4-10 x 43/4-10x4 square hd bolt stl pln b18.2.1 () () ()53
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GLFOHSquare Head BoltGrade 5Plain3/4-10 x 33/4-10x3 square hd bolt grade 5 stl pln b18.2.1 () () ()79
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GLFOHSquare Head BoltGrade 8Plain3/4-10 x 33/4-10x3 square hd bolt grade 8 stl pln b18.2.1 () () ()5
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GLFOHSquare Head BoltSteelPlain1/2-13 x 5 1/21/2-13x5-1/2 square hd bolt stl pln b18.2.1 ()310
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GLFOHSquare Head BoltGrade APlain1-8 x 41-8x4 square hd bolt a307 stl pln b18.2.1 ()3
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GLFOHSquare Head BoltGrade APlain1 1/4-7 x 101-1/4-7x10 square hd bolt a307 stl pln b18.2.1 ()40
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GLFOHSquare Head BoltGrade APlain3/4-10 x 73/4-10x7 square hd bolt a307 stl pln b18.2.1 ()10
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GLFOHSquare Head BoltGrade APlain3/4-10 x 6 1/23/4-10x6-1/2 square hd bolt a307 stl pln b18.2.1 ()1
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BHAMALSquare Head BoltSteelPlain3/4-10 x 83/4-10x8 square head m/b plain b18.2.140
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BHAMALSquare Head BoltSteelPlain7/8-9 x 4 1/27/8-9x4 1/2 square head bolt b18.2.15
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ASMCILSquare Head BoltGrade APlain1/2-13 x 1(ft) coarse a307 gra square hd m/b low carb b18.2.1260
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ASMCILSquare Head BoltGrade APlain1/2-13 x 3(pt) coarse a307 gra square hd m/b low carb b18.2.125
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ASMCILSquare Head BoltGrade APlain1/2-13 x 5(pt) coarse a307 gra square hd m/b low carb b18.2.110
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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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AbabaCASquare Head BoltSteelPlain1/4-20 x 21/4-20 x 2 sq hd blt full thrd steel pln b18.2.12190
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BIG BOLTILSquare Head Bolt300 Stainless (A1,A2, 18-8,304,310 etc.)Plain5/16-18 x 3 1/2bolt & c/s square bolt300 (a1 a2 18-8 304 310 etc.)square b18.2.11000
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BIG BOLTILSquare Head BoltGrade 5Plain1-8 x 20bolt & c/s square boltsquare b18.2.1400
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BIG BOLTILSquare Head BoltGrade 5Plain3/4-16 x 16bolt & c/s square boltb18.2.1700
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BIG BOLTILSquare Head BoltGrade 8Plain1 1/4-7 x 16bolt & c/s square boltsquare b18.2.1500
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BIG BOLTILSquare Head BoltSteelPlain5/16-18 x 9 1/2bolt & c/s square boltsquare b18.2.13398
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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 5Plain7/16-14 x 2 1/2bolt & c/s square boltsquare b18.2.1890
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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 5Plain5/8-11 x 12bolt & c/s square boltsquare b18.2.1700
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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 5Plain1 1/8-7 x 16bolt & c/s square boltsquare b18.2.1 b18.2.1400
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BIG BOLTILSquare Head BoltGrade 8Plain5/8-11 x 12bolt & c/s square boltsquare b18.2.11000
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BIG BOLTILSquare Head BoltGrade 5Plain5/8-11 x 4 1/2bolt & c/s square boltsquare b18.2.13316
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BIG BOLTILSquare Head BoltGrade 8Plain3/4-10 x 8bolt & c/s square boltsquare b18.2.1800
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BIG BOLTILSquare Head BoltGrade 5Plain3/4-16 x 20bolt & c/s square boltb18.2.11100
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BIG BOLTILSquare Head BoltSteelPlain3/4-10 x 20bolt & c/s square boltsquare b18.2.1200
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BIG BOLTILSquare Head BoltGrade 8Plain7/16-14 x 5bolt & c/s square boltsquare b18.2.12500
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BIG BOLTILSquare Head BoltGrade 5Plain7/8-9 x 14bolt & c/s square boltsquare b18.2.1566
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BIG BOLTILSquare Head BoltGrade 5Plain1/2-13 x 6bolt & c/s square boltsquare b18.2.110000
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BIG BOLTILSquare Head BoltGrade 8Plain7/16-14 x 3 1/2bolt & c/s square boltsquare b18.2.11000
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CascadeORSquare Head BoltSteelPlain3/4-10 x 3 1/2square m/b b18.2.157
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CascadeORSquare Head BoltSteelPlain7/8-9 x 12square m/b b18.2.19
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CascadeORSquare Head BoltSteelPlain5/8-11 x 7square m/b b18.2.113
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CascadeORSquare Head BoltSteelPlain5/8-11 x 8square m/b b18.2.124
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CascadeORSquare Head BoltSteelPlain1/4-20 x 1square m/b b18.2.1800
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B & K FASTPASquare Head BoltSteelPlain1/4-20 x 5 1/21/4-20 x 5 1/2 square bolts plain b18.2.120
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B & K FASTPASquare Head BoltSteelPlain5/16-18 x 1 1/25/16-18 x 1 1/2 square bolts plain b18.2.11126
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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 BoltSteelPlain3/8-16 x 23/8-16 x 2 square bolts plain b18.2.1215
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B & K FASTPASquare Head BoltSteelPlain3/8-16 x 7 1/23/8-16 x 7 1/2 square bolts plain b18.2.12
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B & K FASTPASquare Head BoltSteelPlain1/2-13 x 1 1/41/2-13 x 1 1/4 square bolts plain b18.2.12788
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B & K FASTPASquare Head BoltSteelPlain1/2-13 x 1 1/21/2-13 x 1 1/2 square bolts plain b18.2.1323
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B & K FASTPASquare Head BoltGrade 5Plain1/2-13 x 1 3/41/2-13 x 1 3/4 square bolts gr 5 plain b18.2.14
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B & K FASTPASquare Head BoltSteelPlain1/2-13 x 1 3/41/2-13 x 1 3/4 square bolts plain full thread b18.2.11
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B & K FASTPASquare Head BoltSteelPlain1/2-13 x 21/2-13 x 2 square bolts plain b18.2.1197
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B & K FASTPASquare Head BoltSteelPlain1/2-13 x 31/2-13 x 3 square bolts plain b18.2.1244
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B & K FASTPASquare Head BoltSteelPlain1/2-13 x 3 1/41/2-13 x 3 1/4 square bolts plain b18.2.1495
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B & K FASTPASquare Head BoltSteelPlain1/2-13 x 3 1/21/2-13 x 3 1/2 square bolts plain b18.2.18
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B & K FASTPASquare Head BoltSteelPlain1/2-13 x 41/2-13 x 4 square bolts plain b18.2.1708
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B & K FASTPASquare Head BoltSteelPlain1/2-13 x 61/2-13 x 6 square bolts plain b18.2.1467
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B & K FASTPASquare Head BoltSteelPlain1/2-13 x 61/2-13 x 6 square bolts plain full thread b18.2.1120
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B & K FASTPASquare Head BoltSteelPlain1/2-13 x 191/2-13 x 19 square bolts plain b18.2.138
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B & K FASTPASquare Head BoltSteelPlain5/8-11 x 1 1/45/8-11 x 1 1/4 square bolts plain b18.2.11852
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B & K FASTPASquare Head BoltSteelPlain7/8-9 x 3 1/27/8-9 x 3 1/2 square bolts plain b18.2.1523
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B & K FASTPASquare Head BoltSteelPlain7/8-9 x 47/8-9 x 4 square bolts plain b18.2.11
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General FMISquare Head BoltGrade 8Plain5/8-18 x 2 1/45/8-18x2.25 square hd stop bolt gr8 b18.2.124,272
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JET FITTINGCASquare Head BoltSteelPlain5/16-18 x 3/4bolt square 5/1618x3/4 s b18.2.1600
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JET FITTINGCASquare Head BoltSteelPlain1/2-13 x 11/2-13x1 square machine bolts steel plain b18.2.1450
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JET FITTINGCASquare Head BoltGrade APlain5/16-18 x 3 1/25/16-18x3-1/2 (pt) square bolt steel a307 plain b18.2.1500
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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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JET FITTINGCASquare Head BoltGrade APlain1/2-13 x 3 1/21/2-13x3-1/2 (pt) square bolt steel a307 plain b18.2.154
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JET FITTINGCASquare Head BoltGrade APlain1/2-13 x 71/2-13x7 (pt) square bolt steel a307 plain b18.2.125
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JET FITTINGCASquare Head BoltGrade APlain5/8-11 x 3 1/25/8-11x3-1/2 (pt) square bolt steel a307 plain b18.2.195
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THRDFASTFLSquare Head BoltSteelPlain1/2-13 x 3 1/2square hd bolt b18.2.1145
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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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THRDFASTFLSquare Head BoltSteelPlain1/2-13 x 3 1/2square hd bolt b18.2.18
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THRDFASTFLSquare Head BoltSteelPlain5/8-11 x 18a-bolt w/nut & sq washer b18.2.15
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THRDFASTFLSquare Head BoltSteelPlain1 1/8-7 x 4 1/2square hd bolt b18.2.14
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THRDFASTFLSquare Head BoltSteelPlain5/8-11 x 3square hd bolt b18.2.13
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THRDFASTFLSquare Head BoltSteelPlain1 1/4-7 x 10square hd bolt b18.2.12
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THRDFASTOKSquare Head BoltSteelPlain1/2-13 x 1 3/4square hd bolt b18.2.1480
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THRDFASTOKSquare Head BoltSteelPlain1/2-13 x 2square hd bolt b18.2.1430
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THRDFASTOKSquare Head BoltSteelPlain1/2-13 x 1 1/4square hd bolt b18.2.1400
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THRDFASTTNSquare Head BoltSteelPlain1/2-13 x 1 3/4square hd bolt b18.2.150
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THRDFASTTNSquare Head BoltSteelPlain3/4-10 x 17square hd bolt b18.2.16
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THRDFASTTNSquare Head BoltGrade 5Plain1-8 x 8gr5 square hd bolt b18.2.13
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THRDFASTTNSquare Head BoltGrade B8MPlain5/8-11 x 1 3/4a193 b8m sq bolt b18.2.15
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THRDFASTALSquare Head BoltGrade 8Plain3/4nf-16x3 1/2 gr8 square hd bolt b18.2.1400
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THRDFASTALSquare Head BoltSilicon BronzePlain1/2-13 x 2sili brnz sq bolt b18.2.122
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THRDFASTALSquare Head BoltSteelPlain1 1/4-7 x 11square hd bolt b18.2.13
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KBSTNSquare Head BoltGrade 8Plain1-8 x 181-8 x 18 square mach bolt gr-8 b18.2.128
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KBSTNSquare Head BoltGrade 8Plain1-8 x 51-8 x 5 square mach bolt gr-8 b18.2.152
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KBSTNSquare Head BoltGrade 8Plain1-8 x 151-8 x 15 square!machbolt gr-8 b18.2.12
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KBSTNSquare Head BoltGrade 8Plain1-8 x 3 1/21-8 x 3 1/2 square mach bolt gr-8 b18.2.120
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KBSTNSquare Head BoltGrade 8Plain1-8 x 121-8 x 12 square mach bolt gr-8 b18.2.126
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KBSTNSquare Head BoltSteelPlain1-8 x 2 3/41-8 x 2 3/4 square hd mach.bolt b18.2.15
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KBSTNSquare Head BoltGrade 8Plain1 1/8-7 x 101-1/8-7 x 10 inch square mach bolt gr-8 b18.2.14
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KBSTNSquare Head BoltGrade 8Plain1-8 x 6 1/21-8 x 6 1/2 square!machbolt gr-8 b18.2.155
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KBSTNSquare Head BoltGrade 8Plain1-8 x 6 3/41-8 x 6 3/4 square mach bolt gr-8 b18.2.110
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KBSTNSquare Head BoltGrade 8Plain1 1/8-7 x 5 1/21-1/8-7 x 5 1/2 square!machbolt gr-8 b18.2.115
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KBSTNSquare Head BoltGrade 5Plain1-8 x 5 1/21-8 x 5 1/2 square mach.bolt gr-5 b18.2.112
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KBSTNSquare Head BoltGrade 8Plain1-8 x 81-8 x 8 square!machbolt gr-8 b18.2.152
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KBSTNSquare Head BoltGrade 5Plain1 1/4-7 x 141-1/4-7 x 14 square mach.bolt gr-5 b18.2.12
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KBSTNSquare Head BoltGrade 8Plain1 1/4-7 x 4 1/21-1/4-7 x 4 1/2 square!machbolt gr-8 b18.2.190
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KBSTNSquare Head BoltGrade 8Plain1 1/4-7 x 101-1/4-7 x 10 inch square!machbolt gr-8 b18.2.126
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KBSTNSquare Head BoltGrade 8Plain1 1/4-7 x 41-1/4-7 x 4 square!machbolt gr-8 b18.2.150
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KBSTNSquare Head BoltGrade 8Plain1 1/4-7 x 161-1/4-7 x 16 square!machbolt gr-8 b18.2.123
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KBSTNSquare Head BoltGrade 8Plain1 1/4-7 x 121-1/4-7 x 12 square!machbolt gr-8 b18.2.110
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KBSTNSquare Head BoltGrade 8Plain1 1/4-7 x 5 1/21-1/4-7 x 5 1/2 square!machbolt gr-8 b18.2.150
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KBSTNSquare Head BoltGrade 5Plain1 1/4-7 x 41-1/4-7 x 4 square mach.bolt gr-5 b18.2.110
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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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WSBKYSquare Head BoltSteelPlainx 2 1/4blt sqr si brz (pl) 3/8 16x2 1/4 b18.2.150
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WSBKYSquare Head BoltGrade 2Plain5/8-11 x 1 1/2blt fullthread sqr gr2 (pl) 5/8-11x1 1/2 b18.2.11,283
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WSBKYSquare Head Bolt300 Stainless (A1,A2, 18-8,304,310 etc.)Plain1/2-13 x 2blt sqr (18-8) 1/2-13x2 b18.2.147
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WSBKYSquare Head BoltSteelPlain5/16-18 x 7 1/4blt bnt sq st 5/16-18x7.25 b18.2.132
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All SizeTXSquare Head BoltGrade APlain5/8-11 x 35/8-11 x 3 a307 square head bolt plain b18.2.140
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