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Hex Head (F593)

HEX HEAD BOLTS

All hex head bolts listed here are 316 Stainless Steel. Vertex Distribution carries some inventory in other materials such as 18-8 Stainless Steel, Brass, Aluminum, various alloys and Silicon Bronze.

Contact a Vertex Distribution fastener expert for more information on different sizes or materials. Email us at sales@vertexdistribution.com, or use our LiveChat button above, or use the Contact Us page.

   

 

VERTEX PART NUMBER HEAD STYLE MATERIAL TYPE THREAD DIA. - PITCH THREAD DIA. - PITCH X LENGTH KEG QTY. CARTON QTY.
06EH1/4X1/2 HEX 316 Stainless Steel 1/4" - 20 1/4-20 X 1/2" 5,000 100
06EH1/4X5/8 HEX 316 Stainless Steel 1/4" - 20 1/4-20 X 5/8" 4,800 100
06EH1/4X3/4 HEX 316 Stainless Steel 1/4" - 20 1/4-20 X 3/4" 4,000 100
06EH1/4X7/8 HEX 316 Stainless Steel 1/4" - 20 1/4-20 X 7/8" 4,000 100
06EH1/4X1 HEX 316 Stainless Steel 1/4" - 20 1/4-20 X 1" 3,600 100
06EH1/4X1-1/4 HEX 316 Stainless Steel 1/4" - 20 1/4-20 X 1-1/4" 2,800 100
06EH1/4X1-1/2 HEX 316 Stainless Steel 1/4" - 20 1/4-20 X 1-1/2" 2,400 100
06EH1/4X1-3/4 HEX 316 Stainless Steel 1/4" - 20 1/4-20 X 1-3/4" 1,800 100
06EH1/4X2 HEX 316 Stainless Steel 1/4" - 20 1/4-20 X 2" 1,600 100
06EH1/4X2-1/4 HEX 316 Stainless Steel 1/4" - 20 1/4-20 X 2-1/4" 1,300 100
06EH1/4X2-1/2 HEX 316 Stainless Steel 1/4" - 20 1/4-20 X 2-1/2" 1,300 100
06EH1/4X2-3/4 HEX 316 Stainless Steel 1/4" - 20 1/4-20 X 2-3/4" 900 100
06EH1/4X3 HEX 316 Stainless Steel 1/4" - 20 1/4-20 X 3" 900 100
06EH1/4X3-1/2 HEX 316 Stainless Steel 1/4" - 20 1/4-20 X 3-1/2" 750 100
06EH1/4X4 HEX 316 Stainless Steel 1/4" - 20 1/4-20 X 4" 600 100
06EH1/4X5 HEX 316 Stainless Steel 1/4" - 20 1/4-20 X 5" 500 N/A
06EH1/4X6 HEX 316 Stainless Steel 1/4" - 20 1/4-20 X 6" 500 N/A
06EH5/16X1/2 HEX 316 Stainless Steel 5/16" - 18 5/16-18 X 1/2" 3,100 100
06EH5/16X5/8 HEX 316 Stainless Steel 5/16" - 18 5/16-18 X 5/8" 2,800 100
06EH5/16X3/4 HEX 316 Stainless Steel 5/16" - 18 5/16-18 X 3/4" 2,600 100
06EH5/16X7/8 HEX 316 Stainless Steel 5/16" - 18 5/16-18 X 7/8" 2,400 100
06EH5/16X1 HEX 316 Stainless Steel 5/16" - 18 5/16-18 X 1" 2,200 100
06EH5/16X1-1/4 HEX 316 Stainless Steel 5/16" - 18 5/16-18 X 1-1/4" 1,800 100
06EH5/16X1-1/2 HEX 316 Stainless Steel 5/16" - 18 5/16-18 X 1-1/2" 1,600 100
06EH5/16X1-3/4 HEX 316 Stainless Steel 5/16" - 18 5/16-18 X 1-3/4" 1,300 100
06EH5/16X2 HEX 316 Stainless Steel 5/16" - 18 5/16-18 X 2" 1,200 100
06EH5/16X2-1/4 HEX 316 Stainless Steel 5/16" - 18 5/16-18 X 2-1/4" 900 100
06EH5/16X2-1/2 HEX 316 Stainless Steel 5/16" - 18 5/16-18 X 2-1/2" 900 100
06EH5/16X2-3/4 HEX 316 Stainless Steel 5/16" - 18 5/16-18 X 2-3/4" 750 100
06EH5/16X3 HEX 316 Stainless Steel 5/16" - 18 5/16-18 X 3" 700 100
06EH5/16X3-1/2 HEX 316 Stainless Steel 5/16" - 18 5/16-18 X 3-1/2" 500 100
06EH5/16X4 HEX 316 Stainless Steel 5/16" - 18 5/16-18 X 4" 450 100
06EH5/16X5 HEX 316 Stainless Steel 5/16" - 18 5/16-18 X 5" 300 N/A
06EH5/16X6 HEX 316 Stainless Steel 5/16" - 18 5/16-18 X 6" 300 N/A
06EH3/8X1/2 HEX 316 Stainless Steel 3/8" - 16 3/8-16 X 1/2" 2,100 100
06EH3/8X5/8 HEX 316 Stainless Steel 3/8" - 16 3/8-16 X 5/8" 1,900 100
06EH3/8X3/4 HEX 316 Stainless Steel 3/8" - 16 3/8-16 X 3/4" 1,800 100
06EH3/8X7/8 HEX 316 Stainless Steel 3/8" - 16 3/8-16 X 7/8" 1,600 100
06EH3/8X1 HEX 316 Stainless Steel 3/8" - 16 3/8-16 X 1" 1,500 100
06EH3/8X1-1/4 HEX 316 Stainless Steel 3/8" - 16 3/8-16 X 1-1/4" 1,300 100
06EH3/8X1-1/2 HEX 316 Stainless Steel 3/8" - 16 3/8-16 X 1-1/2" 1,000 100
06EH3/8X1-3/4 HEX 316 Stainless Steel 3/8" - 16 3/8-16 X 1-3/4" 1,000 50
06EH3/8X2 HEX 316 Stainless Steel 3/8" - 16 3/8-16 X 2" 800 50
06EH3/8X2-1/4 HEX 316 Stainless Steel 3/8" - 16 3/8-16 X 2-1/4" 700 50
06EH3/8X2-1/2 HEX 316 Stainless Steel 3/8" - 16 3/8-16 X 2-1/2" 650 50
06EH3/8X2-3/4 HEX 316 Stainless Steel 3/8" - 16 3/8-16 X 2-3/4" 600 50
06EH3/8X3 HEX 316 Stainless Steel 3/8" - 16 3/8-16 X 3" 500 50
06EH3/8X3-1/2 HEX 316 Stainless Steel 3/8" - 16 3/8-16 X 3-1/2" 400 50
06EH3/8X3-3/4 HEX 316 Stainless Steel 3/8" - 16 3/8-16 X 3-3/4" 325 N/A
06EH3/8X4 HEX 316 Stainless Steel 3/8" - 16 3/8-16 X 4" 325 50
06EH3/8X4-1/2 HEX 316 Stainless Steel 3/8" - 16 3/8-16 X 4-1/2" 300 N/A
06EH3/8X5 HEX 316 Stainless Steel 3/8" - 16 3/8-16 X 5" 250 N/A
06EH3/8X6 HEX 316 Stainless Steel 3/8" - 16 3/8-16 X 6" 250 N/A
06EH7/16X1 HEX 316 Stainless Steel 7/16" - 14 7/16-14 X 1" 1,100 100
06EH7/16X1-1/4 HEX 316 Stainless Steel 7/16" - 14 7/16-14 X 1-1/4" 950 100
06EH7/16X1-1/2 HEX 316 Stainless Steel 7/16" - 14 7/16-14 X 1-1/2" 750 100
06EH7/16X2 HEX 316 Stainless Steel 7/16" - 14 7/16-14 X 2" 600 50
06EH7/16X2-1/2 HEX 316 Stainless Steel 7/16" - 14 7/16-14 X 2-1/2" 450 50
06EH7/16X3 HEX 316 Stainless Steel 7/16" - 14 7/16-14 X 3" 400 50
06EH1/2X3/4 HEX 316 Stainless Steel 1/2" - 13 1/2-13 X 3/4" 900 50
06EH1/2X1 HEX 316 Stainless Steel 1/2" - 13 1/2-13 X 1" 750 50
06EH1/2X1-1/4 HEX 316 Stainless Steel 1/2" - 13 1/2-13 X 1-1/4" 650 50
06EH1/2X1-3/8 HEX 316 Stainless Steel 1/2" - 13 1/2-13 X 1-3/8" 600 N/A
06EH1/2X1-1/2 HEX 316 Stainless Steel 1/2" - 13 1/2-13 X 1-1/2" 600 50
06EH1/2X1-3/4 HEX 316 Stainless Steel 1/2" - 13 1/2-13 X 1-3/4" 500 50
06EH1/2X2 HEX 316 Stainless Steel 1/2" - 13 1/2-13 X 2" 450 50
06EH1/2X2-1/4 HEX 316 Stainless Steel 1/2" - 13 1/2-13 X 2-1/4" 400 25
06EH1/2X2-1/2 HEX 316 Stainless Steel 1/2" - 13 1/2-13 X 2-1/2" 325 25
06EH1/2X2-3/4 HEX 316 Stainless Steel 1/2" - 13 1/2-13 X 2-3/4" 300 25
06EH1/2X3 HEX 316 Stainless Steel 1/2" - 13 1/2-13 X 3" 300 25
06EH1/2X3-1/4 HEX 316 Stainless Steel 1/2" - 13 1/2-13 X 3-1/4" 250 25
06EH1/2X3-1/2 HEX 316 Stainless Steel 1/2" - 13 1/2-13 X 3-1/2" 250 25
06EH1/2X3-3/4 HEX 316 Stainless Steel 1/2" - 13 1/2-13 X 3-3/4" 200 25
06EH1/2X4 HEX 316 Stainless Steel 1/2" - 13 1/2-13 X 4" 200 25
06EH1/2X4-1/2 HEX 316 Stainless Steel 1/2" - 13 1/2-13 X 4-1/2" 175 25
06EH1/2X5 HEX 316 Stainless Steel 1/2" - 13 1/2-13 X 5" 150 25
06EH1/2X5-1/2 HEX 316 Stainless Steel 1/2" - 13 1/2-13 X 5-1/2" 150 1
06EH1/2X6 HEX 316 Stainless Steel 1/2" - 13 1/2-13 X 6" 150 1
06EH1/2X6-1/2 HEX 316 Stainless Steel 1/2" - 13 1/2-13 X 6-1/2" 150 1
06EH1/2X7 HEX 316 Stainless Steel 1/2" - 13 1/2-13 X 7" 150 1
06EH1/2X7-1/2 HEX 316 Stainless Steel 1/2" - 13 1/2-13 X 7-1/2" 125 1
06EH1/2X8 HEX 316 Stainless Steel 1/2" - 13 1/2-13 X 8" 125 1
06EH1/2X10 HEX 316 Stainless Steel 1/2" - 13 1/2-13 X 10" 120 N/A
06EH5/8X1 HEX 316 Stainless Steel 5/8" - 11 5/8-11 X 1" 400 25
06EH5/8X1-1/4 HEX 316 Stainless Steel 5/8" - 11 5/8-11 X 1-1/4" 350 25
06EH5/8X1-1/2 HEX 316 Stainless Steel 5/8" - 11 5/8-11 X 1-1/2" 300 25
06EH5/8X1-3/4 HEX 316 Stainless Steel 5/8" - 11 5/8-11 X 1-3/4" 300 100
06EH5/8X2 HEX 316 Stainless Steel 5/8" - 11 5/8-11 X 2" 250 25
06EH5/8X2-1/4 HEX 316 Stainless Steel 5/8" - 11 5/8-11 X 2-1/4" 225 25
06EH5/8X2-1/2 HEX 316 Stainless Steel 5/8" - 11 5/8-11 X 2-1/2" 200 25
06EH5/8X2-3/4 HEX 316 Stainless Steel 5/8" - 11 5/8-11 X 2-3/4" 200 25
06EH5/8X3 HEX 316 Stainless Steel 5/8" - 11 5/8-11 X 3" 150 25
06EH5/8X3-1/4 HEX 316 Stainless Steel 5/8" - 11 5/8-11 X 3-1/4" 150 25
06EH5/8X3-1/2 HEX 316 Stainless Steel 5/8" - 11 5/8-11 X 3-1/2" 150 25
06EH5/8X3-3/4 HEX 316 Stainless Steel 5/8" - 11 5/8-11 X 3-3/4" 125 25
06EH5/8X4 HEX 316 Stainless Steel 5/8" - 11 5/8-11 X 4" 125 25
06EH5/8X4-1/2 HEX 316 Stainless Steel 5/8" - 11 5/8-11 X 4-1/2" 100 1
06EH5/8X5 HEX 316 Stainless Steel 5/8" - 11 5/8-11 X 5" 90 1
06EH5/8X5-1/2 HEX 316 Stainless Steel 5/8" - 11 5/8-11 X 5-1/2" 75 1
06EH5/8X6 HEX 316 Stainless Steel 5/8" - 11 5/8-11 X 6" 75 1
06EH5/8X6-1/2 HEX 316 Stainless Steel 5/8" - 11 5/8-11 X 6-1/2" 70 1
06EH5/8X7 HEX 316 Stainless Steel 5/8" - 11 5/8-11 X 7" 70 1
06EH5/8X7-1/2 HEX 316 Stainless Steel 5/8" - 11 5/8-11 X 7-1/2" 60 1
06EH5/8X8 HEX 316 Stainless Steel 5/8" - 11 5/8-11 X 8" 60 1
06EH5/8X9 HEX 316 Stainless Steel 5/8" - 11 5/8-11 X 9" 60 N/A
06EH5/8X10 HEX 316 Stainless Steel 5/8" - 11 5/8-11 X 10" 60 N/A
06EH3/4X1 HEX 316 Stainless Steel 3/4" - 10 3/4-10 X 1" 250 25
06EH3/4X1-1/4 HEX 316 Stainless Steel 3/4" - 10 3/4-10 X 1-1/4" 225 25
06EH3/4X1-1/2 HEX 316 Stainless Steel 3/4" - 10 3/4-10 X 1-1/2" 200 25
06EH3/4X1-3/4 HEX 316 Stainless Steel 3/4" - 10 3/4-10 X 1-3/4" 200 25
06EH3/4X2 HEX 316 Stainless Steel 3/4" - 10 3/4-10 X 2" 180 25
06EH3/4X2-1/4 HEX 316 Stainless Steel 3/4" - 10 3/4-10 X 2-1/4" 150 15
06EH3/4X2-1/2 HEX 316 Stainless Steel 3/4" - 10 3/4-10 X 2-1/2" 140 15
06EH3/4X2-3/4 HEX 316 Stainless Steel 3/4" - 10 3/4-10 X 2-3/4" 130 15
06EH3/4X3 HEX 316 Stainless Steel 3/4" - 10 3/4-10 X 3" 120 15
06EH3/4X3-1/4 HEX 316 Stainless Steel 3/4" - 10 3/4-10 X 3-1/4" 110 15
06EH3/4X3-1/2 HEX 316 Stainless Steel 3/4" - 10 3/4-10 X 3-1/2" 100 15
06EH3/4X3-3/4 HEX 316 Stainless Steel 3/4" - 10 3/4-10 X 3-3/4" 90 15
06EH3/4X4 HEX 316 Stainless Steel 3/4" - 10 3/4-10 X 4" 85 15
06EH3/4X4-1/2 HEX 316 Stainless Steel 3/4" - 10 3/4-10 X 4-1/2" 80 15
06EH3/4X5 HEX 316 Stainless Steel 3/4" - 10 3/4-10 X 5" 65 15
06EH3/4X5-1/2 HEX 316 Stainless Steel 3/4" - 10 3/4-10 X 5-1/2" 60 15
06EH3/4X6 HEX 316 Stainless Steel 3/4" - 10 3/4-10 X 6" 60 15
06EH3/4X6-1/2 HEX 316 Stainless Steel 3/4" - 10 3/4-10 X 6-1/2" 60 1
06EH3/4X7 HEX 316 Stainless Steel 3/4" - 10 3/4-10 X 7" 60 1
06EH3/4X7-1/2 HEX 316 Stainless Steel 3/4" - 10 3/4-10 X 7-1/2" 60 1
06EH3/4X8 HEX 316 Stainless Steel 3/4" - 10 3/4-10 X 8" 60 1
06EH3/4X9 HEX 316 Stainless Steel 3/4" - 10 3/4-10 X 9" 60 1
06EH3/4X10 HEX 316 Stainless Steel 3/4" - 10 3/4-10 X 10" 50 1
06EH7/8X1-1/2 HEX 316 Stainless Steel 7/8" - 9 7/8-9 X 1-1/2" 140 1
06EH7/8X2 HEX 316 Stainless Steel 7/8" - 9 7/8-9 X 2" 120 1
06EH7/8X2-1/4 HEX 316 Stainless Steel 7/8" - 9 7/8-9 X 2-1/4" 110 1
06EH7/8X2-1/2 HEX 316 Stainless Steel 7/8" - 9 7/8-9 X 2-1/2" 105 1
06EH7/8X2-3/4 HEX 316 Stainless Steel 7/8" - 9 7/8-9 X 2-3/4" 90 1
06EH7/8X3 HEX 316 Stainless Steel 7/8" - 9 7/8-9 X 3" 90 1
06EH7/8X3-1/4 HEX 316 Stainless Steel 7/8" - 9 7/8-9 X 3-1/4" 80 1
06EH7/8X3-1/2 HEX 316 Stainless Steel 7/8" - 9 7/8-9 X 3-1/2" 70 1
06EH7/8X3-3/4 HEX 316 Stainless Steel 7/8" - 9 7/8-9 X 3-3/4" 65 1
06EH7/8X4 HEX 316 Stainless Steel 7/8" - 9 7/8-9 X 4" 60 1
06EH7/8X4-1/2 HEX 316 Stainless Steel 7/8" - 9 7/8-9 X 4-1/2" 60 1
06EH7/8X5 HEX 316 Stainless Steel 7/8" - 9 7/8-9 X 5" 50 1
06EH7/8X5-1/2 HEX 316 Stainless Steel 7/8" - 9 7/8-9 X 5-1/2" 45 1
06EH7/8X6 HEX 316 Stainless Steel 7/8" - 9 7/8-9 X 6" 45 1
06EH7/8X7 HEX 316 Stainless Steel 7/8" - 9 7/8-9 X 7" 45 1
06EH7/8X8 HEX 316 Stainless Steel 7/8" - 9 7/8-9 X 8" 45 N/A
06EH7/8X9 HEX 316 Stainless Steel 7/8" - 9 7/8-9 X 9" 40 N/A
06EH7/8X10 HEX 316 Stainless Steel 7/8" - 9 7/8-9 X 10" 40 N/A
06EH1X2 HEX 316 Stainless Steel 1" - 8 1-8 X 2" 90 1
06EH1X2-1/2 HEX 316 Stainless Steel 1" - 8 1-8 X 2-1/2" 80 1
06EH1X2-3/4 HEX 316 Stainless Steel 1" - 8 1-8 X 2-3/4" 70 1
06EH1X3 HEX 316 Stainless Steel 1" - 8 1-8 X 3" 65 1
06EH1X3-1/4 HEX 316 Stainless Steel 1" - 8 1-8 X 3-1/4" 60 N/A
06EH1X3-1/2 HEX 316 Stainless Steel 1" - 8 1-8 X 3-1/2" 60 1
06EH1X3-3/4 HEX 316 Stainless Steel 1" - 8 1-8 X 3-3/4" 50 1
06EH1X4 HEX 316 Stainless Steel 1" - 8 1-8 X 4" 50 1
06EH1X4-1/2 HEX 316 Stainless Steel 1" - 8 1-8 X 4-1/2" 40 1
06EH1X5 HEX 316 Stainless Steel 1" - 8 1-8 X 5" 40 1
06EH1X5-1/2 HEX 316 Stainless Steel 1" - 8 1-8 X 5-1/2" 40 1
06EH1X6 HEX 316 Stainless Steel 1" - 8 1-8 X 6" 40 1
06EH1X8 HEX 316 Stainless Steel 1" - 8 1-8 X 8" 30 1
06EH1X9 HEX 316 Stainless Steel 1" - 8 1-8 X 9" 30 N/A
06EH1X10 HEX 316 Stainless Steel 1" - 8 1-8 X 10" 30 N/A
06EH1-1/8X3 HEX 316 Stainless Steel 1-1/8" - 7 1-1/8-7 X 3" 45 N/A
06EH1-1/8X3-1/2 HEX 316 Stainless Steel 1-1/8" - 7 1-1/8-7 X 3-1/2" 40 N/A
06EH1-1/8X4 HEX 316 Stainless Steel 1-1/8" - 7 1-1/8-7 X 4" 40 N/A
06EH1-1/8X4-1/2 HEX 316 Stainless Steel 1-1/8" - 7 1-1/8-7 X 4-1/2" 30 N/A
06EH1-1/8X5 HEX 316 Stainless Steel 1-1/8" - 7 1-1/8 X 5" 30 1
06EH1-1/8X5-1/2 HEX 316 Stainless Steel 1-1/8" - 7 1-1/8-7 X 5-1/2" 30 N/A
06EH1-1/8X6 HEX 316 Stainless Steel 1-1/8" - 7 1-1/8-7 X 6" 30 N/A
06EH1-1/4X2-1/4 HEX 316 Stainless Steel 1-1/4" - 7 1-1/4-7 X 2-1/4" 30 1
06EH1-1/4X2-1/2 HEX 316 Stainless Steel 1-1/4" - 7 1-1/4-7 X 2-1/2" 30 1
06EH1-1/4X2-3/4 HEX 316 Stainless Steel 1-1/4" - 7 1-1/4-7 X 2-3/4" 30 1
06EH1-1/4X3 HEX 316 Stainless Steel 1-1/4" - 7 1-1/4-7 X 3" 30 1
06EH1-1/4X3-1/2 HEX 316 Stainless Steel 1-1/4" - 7 1-1/4-7 X 3-1/2" 30 N/A
06EH1-1/4X4 HEX 316 Stainless Steel 1-1/4" - 7 1-1/4-7 X 4" 30 N/A
06EH1-1/4X4-1/2 HEX 316 Stainless Steel 1-1/4" - 7 1-1/4-7 X 4-1/2" 25 N/A
06EH1-1/4X5 HEX 316 Stainless Steel 1-1/4" - 7 1-1/4-7 X 5" 25 N/A
06EH1-1/4X5-1/2 HEX 316 Stainless Steel 1-1/4" - 7 1-1/4-7 X 5-1/2" 25 N/A
06EH1-1/4X6 HEX 316 Stainless Steel 1-1/4" - 7 1-1/4-7 X 6" 20 N/A
06EH1-1/4X6-1/2 HEX 316 Stainless Steel 1-1/4" - 7 1-1/4-7 X 6-1/2" 20 N/A
06EH1-1/4X7 HEX 316 Stainless Steel 1-1/4" - 7 1-1/4-7 X 7" 15 N/A
06EH1-1/4X8 HEX 316 Stainless Steel 1-1/4" - 7 1-1/4-7 X 8" 15 N/A
06EH1-1/2X3 HEX 316 Stainless Steel 1-1/2" - 6 1-1/2-6 X 3" 20 1
06EH1-1/2X3-1/4 HEX 316 Stainless Steel 1-1/2" - 6 1-1/2-6 X 3-1/4" 20 1
06EH1-1/2X3-1/2 HEX 316 Stainless Steel 1-1/2" - 6 1-1/2-6 X 3-1/2" 20 1
06EH1-1/2X4 HEX 316 Stainless Steel 1-1/2" - 6 1-1/2-6 X 4" 20 N/A
06EH1-1/2X4-1/2 HEX 316 Stainless Steel 1-1/2" - 6 1-1/2-6 X 4-1/2" 15 N/A
06EH1-1/2X5 HEX 316 Stainless Steel 1-1/2" - 6 1-1/2-6 X 5" 10 N/A
06EH1-1/2X6 HEX 316 Stainless Steel 1-1/2" - 6 1-1/2-6 X 6" 10 N/A
06EH1-1/2X6-1/2 HEX 316 Stainless Steel 1-1/2" - 6 1-1/2-6 X 6-1/2" 10 N/A
06EH1-1/2X7 HEX 316 Stainless Steel 1-1/2" - 6 1-1/2-6 X 7" 10 N/A
06EH1-1/2X7-1/2 HEX 316 Stainless Steel 1-1/2" - 6 1-1/2-6 X 7-1/2" 10 N/A
06EH1-1/2X8 HEX 316 Stainless Steel 1-1/2" - 6 1-1/2-6 X 8" 10 N/A

What's a Hex Head Bolt?

Hex head bolts are bolts have hexagonal heads and are threaded - to secure the bult, you must use a nut. Some other names they are known as: hex cap screws or machine bolts.