The distinction between a bolt and a screw is not clearly defined. The academic difference, according to the Machinery's Handbook, is based on their intended purpose: bolts are designed to pass through an unthreaded hole in a component and are secured with with a nut. In contrast, screws are used in components with their own threads, or to cut its own internal thread into them. This definition allows for ambiguity in defining a fastener based on the application that actually used for, and the terms screw and bolt are widely used by different people or in different countries to apply to the same or varying fixings. Bolts are often used to make a closed joints. This is a combination of the nut that applies axial clamping force and also the shank of the bolt that acts as dowl, pressing the connection against sideways shear forces. For this reason, many bolts have a plain unthreaded shank (called the grip length), because this makes for a better, stronger dowel. The presence of a threadless shank is often considered a characteristic of bolts vs. screws, but this is incidental to its use, rather than defined. Where a fastener forms its own thread in the component being fastened, it is called a screw. This is usually evident when the thread is tapered (i.e. traditional wood screws), precluding the use of a nut, or when a sheet metal screw or other thread-forming screw is used. A screw must always be turned to assemble the joint. Many bolts are held fixed in place during assembly, either by a tool or by a design of non-rotating bolt, such as a carriage bolt, and imply by rotating corresponding nut.

bolts

A bolt is an externally helical threaded fastener that can be tightened or loosened by torque on the mating nut. The bolt has an external male thread that requires a nut with matching female thread.Learn more..

Bolts use a wide variety of head designs. These are designed to engage with the tool used to tighten them. Some bolt heads instead lock the bolt in place, so that it does not move and a tool is only needed for the nut end. Common bolt heads include hex, slotted hex washer, and socket cap. The first bolts had square heads, formed by forging. These are still found, although much more common today is the hexagonal head. These are held and turned by a spanner or socket, of which there are many forms. Most are held from the side, some from in-line with the bolt. Other bolts have T-heads and slotted heads

Square Neck Head Bolts

StandardsDIN 186 / CSN 21343 / PN 82418
Size RangeM6 to M48
MaterialsBrass, Mild Steel, Stainless Steel
Surface TreatmentZinc, Cadmium, Nickel, Galvanize, Chrome
Square Neck Head Bolts
Square Neck Head Bolts DrawingHover on Image to Enlarge

NOTE: This product can also be provided in special dimensions and features as per requirement

Thread dpbdseknmr1r2Type B
auxiliary sizenom.maxminminnom. sizemaxminnom.maxminnom.maxminapprox.approx.ls minlg max
M61.0018.00-6.006.485.526.884.504.904.106.006.605.4016.0016.9015.100.500.905.0010.00
M81.2522.00-8.008.587.429.245.505.905.108.008.757.2518.0018.9017.100.501.206.7513.00
M101.5026.00-10.0010.589.4211.817.007.506.5010.0010.759.2521.0022.0020.000.501.508.5016.00
M121.7530.00-12.0012.7011.3014.178.008.757.2512.0012.9011.1026.0027.0025.001.001.8010.2519.00
M162.0038.0044.0016.0016.7015.3019.3210.5011.409.6016.0016.9015.1030.0031.0029.001.002.4015.0025.00
M202.5046.0052.0020.0020.8419.1624.3313.0013.9012.1020.0021.0019.0036.0037.2534.751.003.0018.5031.00
M243.0054.0060.0024.002.8423.1629.4815.0015.9014.1024.0025.0023.0043.0044.2541.751.603.6022.0037.00
M303.5066.0072.0030.0030.8429.1637.2019.0020.0018.0030.0031.0029.0054.0055.5052.501.604.5025.5043.00
M364.0078.0084.0036.0037.0035.0044.5723.0024.0022.0036.0037.2534.7566.0067.5064.502.005.4035.0055.00
M424.50-96.0042.0043.0041.0052.2926.0027.0025.0042.0043.2540.7580.0081.5078.502.006.3041.5054.00
M485.00-108.0048.0049.0047.0060.0030.0031.0029.0048.0049.2546.7588.0089.7586.252.007.2047.0072.00

*All Dimensions are for reference only, kindly confirm actual dimension before placing order

*All Dimensions are in Millimeter unless otherwise specified

T-Bolt with Double Nip

StandardsDIN 188 / CSN 21343 / PN 82418
Size Range1.25 to 6.00
MaterialsBrass, Mild Steel, Stainless Steel
Surface TreatmentZinc, Cadmium, Nickel, Galvanize, Chrome
T-Bolt with Double Nip
T-Bolt with Double Nip DrawingHover on Image to Enlarge

NOTE: This product can also be provided in special dimensions and features as per requirement

pbknm
1.2522.005.508.0018.00
1.5026.007.0010.0021.00
1.7530.008.0012.0026.00
2.0038.0010.5016.0030.00
2.5046.0013.0020.0036.00
3.0054.0015.0024.0043.00
3.5066.0019.0030.0054.00
4.0078.0023.0036.0066.00
4.5096.0026.0042.0080.00
5.00108.0030.0048.0088.00
5.50124.0035.0056.00102.00
6.00130.0040.0064.00115.00
6.00156.0045.0072.00128.00
6.00172.0050.0080.00140.00

*All Dimensions are for reference only, kindly confirm actual dimension before placing order

*All Dimensions are in Millimeter unless otherwise specified

T Head Bolts

StandardsDIN 261 / PN 82424
Size RangeM8 to M100
MaterialsBrass, Mild Steel, Stainless Steel
Surface TreatmentZinc, Cadmium, Nickel, Galvanize, Chrome
T Head Bolts
T Head Bolts DrawingHover on Image to Enlarge

NOTE: This product can also be provided in special dimensions and features as per requirement

Thread dpbdbdsknmrt
l to 120 mml from 120 to 200 mml over 200mmmaxminNom. SizemaxminNom SizemaxminNommaxminapproxmin
M81.2522.00---8.587.425.505.905.108.008.757.2518.0018.9017.100.50-
M101.5026.00---10.589.427.007.506.5010.0010.759.2521.0022.0020.000.50-
M121.7530.00---12.7011.308.008.757.2512.0012.9011.1026.0027.0025.001.00-
M162.0038.0044.00--16.7015.3010.5011.409.6016.0016.9015.1030.0031.0029.001.00-
M202.5046.0052.00--20.8419.1613.0013.9012.1020.0021.0019.0036.0037.2535.751.00-
M243.0054.0060.00--24.8423.1615.0015.9014.1024.0025.0023.0043.0044.2541.751.60-
M303.5066.0072.00--30.8429.1619.0020.0018.0030.0031.0029.0054.0055.5052.501.60-
M364.0078.0084.00-M1237.0035.0023.0024.0022.0036.0037.2534.7566.0067.5064.502.0022.00
M424.5090.0096.00109.00M1234.0033.0026.0027.0025.0042.0043.2540.7580.0081.5078.502.0022.00
M485.00-108.00121.00M1238.0037.0030.0031.0029.0048.0049.2546.7588.0089.7586.252.0022.00
M565.50-124.00137.00M1645.0044.0035.0036.2533.7556.0057.5054.50102.00103.75100.253.0026.00
M646.00-130.00143.00M1650.0049.0040.0041.2538.7564.0065.5062.50115.00116.75113.253.0026.00
M72 x 66.00--169.00M1655.0053.8045.0046.2543.7572.0073.5070.50128.00130.00126.004.0026.00
M80 x 66.00--185.00M2065.0063.8050.0051.2548.7580.0081.5078.50140.00142.00138.004.0033.00
M90 x 66.00--205.00M2070.0068.8055.0056.5053.5090.0091.7588.25155.00157.00153.004.0033.00
M100 x 66.00--225.00M2080.0078.8062.0063.5060.50100.00101.7598.25170.00172.00168.005.0033.00

*All Dimensions are for reference only, kindly confirm actual dimension before placing order

*All Dimensions are in Millimeter unless otherwise specified

Square Head Bolts

StandardsDIN 478 / CSN 21122 / PN 82301
Size RangeM8 to M16
MaterialsBrass, Mild Steel, Stainless Steel
Surface TreatmentZinc, Cadmium, Nickel, Galvanize, Chrome
Square Head Bolts
Square Head Bolts DrawingHover on Image to Enlarge

NOTE: This product can also be provided in special dimensions and features as per requirement

desbkd1
M 810.008.0022.0010.0013.50
M 1013.0010.0026.0013.0016.50
M 1217.0013.0030.0015.0019.50
M 1621.0016.0038.0020.0025.00

*All Dimensions are for reference only, kindly confirm actual dimension before placing order

*All Dimensions are in Millimeter unless otherwise specified

Square Head Bolts (Short Dog Point)

StandardsDIN 479 / CSN 21121 / PN 82307
Size RangeM5 to M24
MaterialsBrass, Mild Steel, Stainless Steel
Surface TreatmentZinc, Cadmium, Nickel, Galvanize, Chrome
Square Head Bolts (Short Dog Point)
Square Head Bolts (Short Dog Point) DrawingHover on Image to Enlarge

NOTE: This product can also be provided in special dimensions and features as per requirement

DimensionsPa1dpekk'rsz1
maxnominal=maxminnominal=maxminnominalmaxminminminnominal=maxminnominal=maxmin
M 50.802.403.503.326.505.925.004.855.153.400.205.004.821.251.50
M 61.003.004.003.828.007.426.005.856.154.100.256.005.821.501.75
M 81.254.005.505.3210.009.428.007.828.185.500.408.007.782.002.25
M 101.504.507.006.7813.0012.3010.009.8210.186.900.4010.009.782.502.75
M 121.755.308.508.2817.0016.3012.0011.7912.218.300.6013.0012.733.003.25
M 162.006.0012.0011.7322.0021.1616.0015.7916.2111.100.6017.0016.734.004.30
M 202.507.5015.0014.7328.0027.1620.0019.7420.2613.800.8022.0021.675.002.30
M 243.009.0018.0017.7832.0031.0022.0021.7422.2615.200.8024.0023.676.006.30

*All Dimensions are for reference only, kindly confirm actual dimension before placing order

*All Dimensions are in Millimeter unless otherwise specified

Hex Bolts with Shank

StandardsDIN 931 / ISO 4014 / CSN 21101 / PN 82101 / UNI 5737 / EU 24014
Size RangeM2 to M72
MaterialsBrass, Mild Steel, Stainless Steel
Surface TreatmentZinc, Cadmium, Nickel, Galvanize, Chrome
Hex Bolts with Shank
Hex Bolts with Shank DrawingHover on Image to Enlarge

NOTE: This product can also be provided in special dimensions and features as per requirement

SizeWidth Across Flat (s)Head Height (k)Thread Length
DIN 931ISO 4014DIN 931ISO 4014DIN 931 Length (in MM)ISO 4014 Length (in MM)
MinMaxMinMaxMinMaxMinMax≥125>125≥200≥200≥125>125≥200≥200
M23.824.003.824.001.281.521.281.5310.00--10.00--
M35.325.505.325.501.882.121.882.1312.00--12.00--
M46.787.006.787.002.682.922.682.9314.00--14.00--
M57.788.007.788.003.353.653.353.6516.0022.00-16.00--
M69.7810.009.7810.003.854.153.854.1518.0024.00-18.00--
M812.7313.0012.7313.005.155.455.155.4522.0028.0041.0022.00--
M1016.7317.0015.7316.006.226.586.226.5826.0032.0045.0026.00--
M1218.6719.0017.7318.007.327.687.327.6830.0036.0049.0030.00--
M1421.6722.0020.6721.008.628.988.628.9834.0040.0053.0034.0040.00-
M1623.6724.0023.6724.009.8210.209.8210.1838.0044.0057.0038.0044.00-
M1826.6727.0026.6727.0011.2811.7011.2911.7242.0048.0061.0042.0048.00-
M2029.6730.0029.6730.0012.2812.7012.2912.7246.0052.0065.0046.0052.00-
M2231.6132.0033.3834.0013.7814.2013.7914.2250.0056.0069.0050.0056.0069.00
M2435.3836.0035.3836.0014.7815.2014.7915.2254.0060.0073.0054.0060.0073.00
M2740.0041.0040.0041.0016.6517.4016.6517.3560.0066.0079.0060.0066.0079.00
M3045.0046.0045.0046.0018.2819.1018.2819.1266.0072.0085.0066.0072.0085.00
M3349.0050.0049.0050.0020.5821.4020.5821.4272.0078.0091.00-78.0091.00
M3653.8055.0053.8055.0022.0822.9022.0822.9278.0084.0097.00-84.0097.00
M3958.8060.0058.8060.0024.5825.4024.5825.4284.0090.00103.00-90.00103.00
M4263.1065.0063.1065.0025.5826.4025.5826.4290.0096.00109.00-96.00109.00
M4568.1070.0068.1070.0027.5828.4027.5828.4296.00102.00115.00-102.00115.00
M4873.1075.0073.1075.0029.5830.4029.5830.42102.00108.00121.00-108.00121.00
M5278.1080.0078.1080.0032.5033.5032.5033.50-116.00129.00-116.00129.00
M5682.8085.0082.8085.0034.5035.5034.5035.50-124.00137.00--137.00
M6087.8090.0087.8090.0037.5038.5037.5038.50-132.00145.00--145.00
M6492.8095.0092.8095.0039.5040.5039.5040.50-140.00153.00--153.00
M72102.80105.00----44.5045.50-----156.00169.00---

*All Dimensions are for reference only, kindly confirm actual dimension before placing order

*All Dimensions are in Millimeter unless otherwise specified

Hex Bolts (Full Thread)

StandardsDIN 93 / ISO 4017 / CSN 21103 / PN 82105 / UNI 5739 / EU 24017
Size RangeM2 to M72
MaterialsBrass, Mild Steel, Stainless Steel
Surface TreatmentZinc, Cadmium, Nickel, Galvanize, Chrome
Hex Bolts (Full Thread)
Hex Bolts (Full Thread) DrawingHover on Image to Enlarge

NOTE: This product can also be provided in special dimensions and features as per requirement

SizeWidth Across Flat (s)Head Height (k)
DIN 933ISO 4017DIN 933ISO 4017
MinMaxMinMaxMinMaxMinMax
M23.824.003.824.001.281.521.281.53
M35.325.505.325.501.882.121.882.13
M46.787.006.787.002.682.922.682.93
M57.788.007.788.003.353.653.353.65
M69.7810.009.7810.003.854.153.854.15
M812.7313.0012.7313.005.155.455.155.45
M1016.7317.0015.7316.006.226.586.226.58
M1218.6719.0017.7318.007.327.687.327.68
M1421.6722.0020.6721.008.628.988.628.98
M1623.6724.0023.6724.009.8210.209.8210.18
M1826.6727.0026.6727.0011.2811.7011.2911.72
M2029.6730.0029.6730.0012.2812.7012.2912.72
M2231.6132.0033.3834.0013.7814.2013.7914.22
M2435.3836.0035.3836.0014.7815.2014.7915.22
M2740.0041.0040.0041.0016.6517.4016.6517.35
M3045.0046.0045.0046.0018.2819.1018.2819.12
M3349.0050.0049.0050.0020.5821.4020.5821.42
M3653.8055.0053.8055.0022.0822.9022.0822.92
M3958.8060.0058.8060.0024.5825.4024.5825.42
M4263.1065.0063.1065.0025.5826.4025.5826.42
M4568.1070.0068.1070.0027.5828.4027.5828.42
M4873.1075.0073.1075.0029.5830.4029.5830.42
M5278.1080.0078.1080.0032.5033.5032.5033.50
M5682.8085.0082.8085.0034.5035.5034.5035.50
M6087.8090.0087.8090.0037.5038.5037.5038.50
M6492.8095.0092.8095.0039.5040.5039.5040.50
M72102.80105.00----44.5045.50----

*All Dimensions are for reference only, kindly confirm actual dimension before placing order

*All Dimensions are in Millimeter unless otherwise specified

Hex Bolts with Slot

StandardsDIN 933 SZ / UNI 5739
Size RangeM3 / M4 / M5 / M6 / M8
MaterialsBrass, Mild Steel, Stainless Steel
Surface TreatmentZinc, Cadmium, Nickel, Galvanize, Chrome
Hex Bolts with Slot
Hex Bolts with Slot DrawingHover on Image to Enlarge

NOTE: This product can also be provided in special dimensions and features as per requirement

dkstn
M32.005.500.800.80
M42.807.001.101.00
M53.508.001.401.20
M64.0010.001.601.60
M85.3013.002.102.00

*All Dimensions are for reference only, kindly confirm actual dimension before placing order

*All Dimensions are in Millimeter unless otherwise specified

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Bolts and Screws