Square Head Bolts, All ASME Grades of Steel

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 .

No results for ASTM A449, but 200 ASTM A449 items displayed. For ASTM A449, click here.

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SupplierLocTypeMaterialFinishSizeDescriptionQty 
B & K FASTPASquare Head BoltSteelGalvanized1/4-20 x 11/4-20 x 1 galv square bolts b18.2.1318
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B & K FASTPASquare Head BoltSteelGalvanized1/4-20 x 1 1/21/4-20 x 1 1/2 galv square bolts b18.2.153
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B & K FASTPASquare Head BoltSteelGalvanized5/8-11 x 45/8-11 x 4 galv square bolts b18.2.1581
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B & K FASTPASquare Head BoltSteelGalvanized5/8-11 x 4 1/25/8-11 x 4 1/2 galv square bolts b18.2.133
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B & K FASTPASquare Head BoltSteelGalvanized3/4-10 x 7 1/23/4-10 x 7 1/2 galv square bolts b18.2.14
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B & K FASTPASquare Head BoltSteelGalvanized3/4-10 x 143/4-10 x 14 galv square bolts b18.2.11
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B & K FASTPASquare Head BoltSteelGalvanized7/8-9 x 167/8-9 x 16 galv square bolts 6 thread b18.2.132
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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 BoltSteelZinc/Clear5/16-18 x 1 1/45/16-18 x 1 1/4 square bolts zinc b18.2.117
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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 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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B & K FASTPASquare Head BoltGrade 8Zinc/Yellow7/16-20 x 57/16-20 x 5 square bolts gr 8 z yellow b18.2.152
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B & K FASTPASquare Head BoltSteelPlain1/2-13 x 1 1/41/2-13 x 1 1/4 square bolts plain b18.2.13013
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Set ScrewILSquare Head BoltSteelPlain1/2-13 x 1square knurled cup point heat treat r/c-45 per printinquire
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Set ScrewILSquare Head BoltGrade 8Plain1 1/8-7 x 15.0square boltinquire
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YANKEENHSquare Head BoltSteelPlain5/16-18 x 35/16-18 x 3 square hd bolt136
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YANKEENHSquare Head BoltSteelPlain5/16-18 x 1 3/45/16-18 x 1-3/4 square head bolt342
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YANKEENHSquare Head BoltSteelPlain5/16-18 x 25/16-18 x 2 square hd bolt192
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YANKEENHSquare Head BoltSteelPlain3/8-16 x 43/8-16 x 4 square hd bolt364
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YANKEENHSquare Head BoltGrade APlain1/2-13 x 1 1/21/2-13 x 1-1/2 square head bolt astm a307106
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YANKEENHSquare Head BoltGrade 5Plain1/2-13 x 1 1/21/2-13 x 1-1/2 square head bolt grade 5 plain finish53
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YANKEENHSquare Head BoltSteelPlain1/2-13 x 21/2-13 x 2 square hd bolt2
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YANKEENHSquare Head BoltGrade APlain1/2-13 x 2 1/21/2-13 x 2-1/2 square head bolt astm a307292
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YANKEENHSquare Head BoltSteelPlain1/2-13 x 3 1/21/2-13 x 3 1/2 square hd bolt120
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YANKEENHSquare Head BoltSteelPlain1/2-13 x 51/2-13 x 5 square hd bolt11
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YANKEENHSquare Head BoltSteelPlain5/8-11 x 25/8-11 x 2 square hd bolt19
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YANKEENHSquare Head BoltSteelPlain5/8-11 x 2 1/25/8-11 x 2 1/2 square hd bolt7
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YANKEENHSquare Head BoltSteelPlain5/8-11 x 45/8-11 x 4 square hd bolt20
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YANKEENHSquare Head BoltSteelPlain5/8-11 x 75/8-11 x 7 square hd bolt38
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YANKEENHSquare Head BoltSteelPlain3/4-10 x 2 1/43/4-10 x 2 1/4 square hd bolt70
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YANKEENHSquare Head BoltSteelPlain3/4-10 x 3 1/23/4-10 x 3 1/2 square hd bolt17
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ACCURATEILSquare Head BoltSteelPlain1/2-13 x 13bolt square machine200
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ACCURATEILSquare Head BoltSteelPlain1/2-13 x 6 1/21/2-13x6 1/2 bolt square machine plain150
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ACCURATEILSquare Head BoltGrade 5Zinc/Clear5/8-11 x 3 1/4bolt square machine gr510
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ACCURATEILSquare Head BoltSteelPlain1-8 x 5bolt square machine30
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ACCURATEILSquare Head BoltSteelPlain1/4-20 x 2 1/2bolt square machine black400
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ACCURATEILSquare Head BoltSteelPlain1/4-20 x 3 1/4bolt square machine200
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ACCURATEILSquare Head BoltSteelZinc/Clear1/4-20 x 3 1/4bolt square machine1500
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ACCURATEILSquare Head BoltSteelZinc/Clear5/16-18 x 1bolt square machine2780
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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/Clear7/16-14 x 4 3/4bolt square machine170
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ACCURATEILSquare Head BoltSteelPlain1/2-13 x 1 3/4bolt square machine600
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ACCURATEILSquare Head BoltSteelPlain5/8-11 x 8 1/2bolt square machine50
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ACCURATEILSquare Head BoltSteelPlain5/8-11 x 1 1/4bolt square machine540
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ACCURATEILSquare Head BoltSteelZinc/Clear5/8-11 x 1 1/4bolt square machine215
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ACCURATEILSquare Head BoltSteelPlain7/8-9 x 1 1/2bolt square machine105
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AmericanNYSquare Head BoltGrade 5Plain5/16-24 x 15/16-24 x 1 square bolt grade 52220
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AmericanNYSquare Head BoltGrade 5Plain5/16-24 x 15/16-24 x 1 square bolt grade 5 plain672
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AmericanNYSquare Head BoltSteelZinc/Clear3/8-16 x 6square m/b zp44
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AmericanNYSquare Head BoltSteelPlain5/6-18 x 5 1/2square bolt250
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AmericanNYSquare Head BoltSteelPlain1/4-20 x 5/8square m/b100
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AmericanNYSquare Head BoltSteelPlain5/16-18 x 2 1/2square m/b50
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AmericanNYSquare Head BoltSteelCadmium5/16-18 x 3square bolt700
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AmericanNYSquare Head BoltSteelPlain5/16-18 x 4square bolt2450
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AmericanNYSquare Head BoltSteelPlain5/16-18 x 5square bolt900
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AmericanNYSquare Head BoltSteelBlack Oxide1/4-20 x 3/4square m/b black ox5150
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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 BoltSteelPlain1/4-20 x 1 1/4square m/b10000
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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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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 b18.2.130
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AbabaCASquare Head BoltSteelZinc/Clear3/4-10 x 2 3/43/4-10 x 2 3/4 sq hd bolt steel znc b18.2.1127
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JacksonMSSquare Head BoltGrade 2Galvanized1/2-13 x 1 1/2square bolt hdg212
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JacksonMSSquare Head BoltGrade 2Plain1/2-13 x 1 1/4square bolt gr. 2400
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JacksonMSSquare Head BoltGrade 2Plain1/2-13 x 4 1/2square bolt gr. 21
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JacksonMSSquare Head BoltGrade 2Plain3/4-10 x 3 1/2square bolt gr. 22
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JacksonMSSquare Head BoltGrade 2Plain1 1/8 x 4nc square bolt gr. 278
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JacksonMSSquare Head BoltGrade 2Zinc/Clear5/16 x 1nc square bolt gr. 2107
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JacksonMSSquare Head BoltGrade 2Zinc/Clear5/16 x 1 1/2nc square bolt gr. 27
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JacksonMSSquare Head BoltGrade 2Zinc/Clear3/8 x 1 1/2nc square bolt gr. 22
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JacksonMSSquare Head BoltGrade 5Plain1/2-13 x 3 1/2square2
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JacksonMSSquare Head BoltGrade 5Plain1/2-13 x 4nc square bolt gr. 5 fastenel # 0168684 or equal167
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JacksonMSSquare Head BoltGrade 5Plain5/8-11 x 4 1/2nc square bolt gr. 5 f/t3
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JacksonMSSquare Head BoltGrade 5Plain3/4-10 x 4 1/2square25
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JacksonMSSquare Head BoltGrade 5Plain1-8 x 3 1/2square25
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JacksonMSSquare Head BoltGrade 5Zinc/Clear1/2-13 x 1nc square bolt gr.546
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JacksonMSSquare Head BoltGrade 5Zinc/Clear1/2-13 x 1 1/2nc square bolt gr.536
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JacksonMSSquare Head BoltGrade 5Zinc/Clear1/2-20 x 2nc square bolt gr.542
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AbabaCASquare Head BoltSteelZinc/Clear5/8-11 x 25/8-11 x 2 sq hd blt steel znc b18.2.16
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AbabaCASquare Head BoltSteelZinc/Clear5/8-11 x 2 1/25/8-11 x 2 1/2 sq hd blt steel znc b18.2.16
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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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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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AbabaCASquare Head BoltSteelZinc/Clear1/4-20 x 21/4-20 x 2 sq hd blt full thrd steel znc b18.2.1200
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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 BoltSteelPhosphateM3/8-16 x 1 1/2bolt and nut combo square 3/8-16x1-1/2 steel phosphate black200
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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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CNBILSquare Head BoltGrade 2Plain1 1/4-7 x 13square m/b with 4 inches of thread per drawing b1023 item 35
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CNBILSquare Head BoltGrade 2Plain1/4-20 x 1 1/2square m/b400
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CNBILSquare Head BoltGrade 2Zinc/Clear1/4-20 x 1 1/2square m/b200
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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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JET FITTINGCASquare Head BoltSteelBlack Oxide5/16-18 x 3/4bolt square 5/16-18x3/4 steel black oxide and wax b18.2.12000
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