Hex Nuts | Raptor Supplies United Kingdom

Hex Nuts

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Hex nuts are metal fasteners having six sides. They can be used with bolts, washers, anchors, studs, threaded rods & screws. They are designed to fasten two or more wood / metal parts or...Read more

METRIC BLUE -

Hex Nuts

StyleModelDia./Thread SizeGradeHeightProperty ClassRockwell HardnessSizeThread TypeWidthPrice (inc. VAT)
AUST182798M6 x 1Class 105mmCL 1026 to 37M6 x 1UNC10mm£22.77
BUST181929M8 x 1.25Class 106.5mmCL 1026 to 37-UNC13mm£14.39
BUST182708M10 x 1.5Class 108mmCL 1026 to 37-UNC17mm£15.70
BUST182800M12 x 1.75Class 1010mmCL 1026 to 37-UNC19mm£24.68
CUST182801M14 x 21011mm10C36-Coarse22mm£10.91
DUST182802M16 x 2Class 1013mmCL 1026 to 37M16 x 2UNC24mm£15.99
EUST182804M20 x 2.5Class 1016mmCL 1026 to 37-UNC30mm£17.49
BUST182806M24 x 3Class 1019mmCL 1026 to 37-UNC36mm£25.42
APPROVED VENDOR -

A4 Stainless Steel (Comparable to 316 Stainless Steel) Hex Nut, Plain Finish

StyleModelDia./Thread SizeHeightThread SizeWidthPrice (inc. VAT)
AM55080.360.0001-29mmM36 x 455mm£26.33
BM55080.020.0001M2-0.41.6mmM2 x 0.44mm£5.53
CM55080.025.0001M2.5-0.452mmM2.5 x 0.455mm£5.58
DM55080.030.0001M3 x 0.52.4mmM3 x 0.55.5mm£1.23
EM55080.040.0001M4 x 0.73.2mmM4 x 0.77mm£4.84
CM55080.050.0001M5 x 0.84mm-8mm£3.90
CM55080.060.0001M6 x 15mm-10mm£5.12
CM55080.080.0001M8 x 1.256.5mm-13mm£8.48
APPROVED VENDOR -

Carbon Steel Hex Nut, Zinc Finish

StyleModelDia./Thread SizeGradeHeightRockwell HardnessSystem of MeasurementThread SizeThread TypeWidthPrice (inc. VAT)
AU04162.150.00021 1/2-12"81 9/32"C33 to C39Inch13UNF-£123.07
AU04162.125.00021 1/4-12"81 1/16"C33 to C39Inch13UNF-£58.94
BU01330.100.00031"-14555/64"C19 to C30Inch-UNS-£9.54
CU08161.100.00031"-14255/64"B70 to B100Inch-UNS-£10.05
AU04162.050.00021/2"-2087/16"C33 to C39Inch-UNF-£13.04
DU04162.025.00021/4"-2887/32"C33 to C39Inch-UNF-£8.91
AU04162.075.00023/4"-16841/64"C33 to C39Inch-UNF-£25.30
AU04162.037.00023/8"-24821/64"C33 to C39Inch-UNF-£16.07
EU04162.062.00025/8"-18835/64"C33 to C39Inch-UNF-£29.89
FU04162.043.00027/16"-2083/8"C33 to C39Inch-UNF-£23.06
GM01301.120.0001M12 x 1.75Class 8.810mmC30 to C36Metric-Metric18mm£15.35
HM01301.160.0001M16 x 2Class 8.813mmC30 to C36Metric-Metric24mm£17.08
IM01301.200.0001M20 x 2.5Class 8.816mmC30 to C36Metric-Metric30mm£20.46
JM01300.330.0001M33-3.5Class 8.826mmC30 to C36MetricM33 x 3.5Metric50mm£15.66
AM01300.420.0001M42 x 4.5Class 8.834mmC30 to C36Metric-Metric65mm£35.56
KM01300.450.0001M45-4.5Class 8.836mmC30 to C36MetricM45 x 4.5Metric70mm£47.90
AM01300.480.0001M48 x 5Class 8.838mmC30 to C36Metric-Metric75mm£50.95
GORLITZ -

Hex Bolts

StyleModelPrice (inc. VAT)
AT01 123£1.22
RFQ
AT01 122£1.22
RFQ
AT01A 120£0.73
RFQ
AT01A 122£1.22
RFQ
AT01 120£0.73
RFQ
AT01A 123£1.22
RFQ
APPROVED VENDOR -

18-8 Stainless Steel Hex Nut

StyleModelDia./Thread SizeHeightThread SizeThread TypeWidthPrice (inc. VAT)
AU51080.150.00011 1/2-6"1 9/32"7UNC2.25"£88.00
BU51160.150.00021 1/2-12"1 9/32"13UNF2.25"£218.70
CU51080.125.00011 1/4-7"1 1/16"8UNC1.875"£62.11
DU51160.125.00021 1/4-12"1 1/16"13UNF1.875"£30.20
CU51080.112.00011 1/8-7"31/32"8UNC1 11/16"£36.78
EU51160.112.00021 1/8-12"31/32"13UNF1 11/16"£120.74
CU51160.101.00021"-1455/64"-UNF-£34.67
FU51160.050.00021/2"-207/16"-UNF3/4"£11.47
CU51080.025.00011/4"-207/32"-UNC7/16"£4.87
GU51160.025.00021/4"-287/32"-UNF7/16"£4.03
CU51160.075.00023/4"-1641/64"-UNF1.125"£20.52
HU51160.037.00023/8"-2421/64"-UNF9/16"£7.45
IU51080.031.00015/16"-1817/64"-UNC1/2"£7.69
CU51160.031.00025/16"-2417/64"-UNF1/2"£5.19
JU51160.043.00027/16"-203/8"-UNF11/16"£5.53
KU51080.056.00019/16"-1231/64"-UNC7/8"£26.44
CU51160.056.00029/16"-1831/64"-UNF7/8"£50.36
StyleModel
A1302260495
RFQ
A1302260483
RFQ
APPROVED VENDOR -

18-8 Stainless Steel Hex Jam Nut, Plain Finish

StyleModelDia./Thread SizeHeightRockwell HardnessThread TypeWidthPrice (inc. VAT)
A1WU291"-1435/64"B95UNS1.5"£9.39
B33971/2"-205/16"B95 to C35UNF3/4"£42.33
C1WE871/4"-285/32"B95UNF7/16"£22.16
D47583/4"-1627/64"B80 to C35UNF1.125"£30.32
E18823/8"-247/32"B95 to C35UNF9/16"£36.81
F53115/16"-243/16"B95 to C35UNF1/2"£16.33
APPROVED VENDOR -

Low Carbon Steel Hex Nut, Yellow Zinc-Plated Finish

StyleModelDia./Thread SizeGradeHeightProperty ClassRockwell HardnessSystem of MeasurementThread SizeThread TypePrice (inc. VAT)
A3HED21 3/4-5"81.5"8C26 to C36Inch6UNC£36.03
B3HEC71 3/8-6"81 11/64"8C26 to C36Inch7UNC£12.76
C3HEC81 3/8-12"81 11/64"8C26 to C36Inch13UNF£17.98
D3HED32-4-1/2"81 23/32"8C26 to C36Inch2.5UNC£53.70
E3HED42-12"81 23/32"8C26 to C36Inch2-12UNF£53.78
C4RXN32-12"81.75"8C26 to C36Inch-UNF£283.03
F4RXP37/8"-983/4"8C26 to C34Inch-UNC£557.10
G6CA54M3 x 0.5Class 102.4mm10C36 max.MetricM3 x 0.5Metric£46.33
H6CA55M4 x 0.7Class 103.2mm10C36 max.MetricM4 x 0.7Metric£31.60
I6CA56M5 x 0.8Class 104mm10C36 max.Metric-Metric£18.21
J5ZY61M30 x 3.5Class 1024mm10C36 max.Metric-Metric£12.08
K5ZY63M36 x 4Class 1029mm10C36 max.Metric-Metric£20.03
MIDWEST ACORN NUT -

Hex Nuts

StyleModelDia./Thread SizeHeightWidthPrice (inc. VAT)
AMPB6521/4"-207/32"7/16"£31.91
BMPB6531/4"-287/32"7/16"£44.93
CMPB6563/8"-1621/64"9/16"£54.85
DMPB6573/8"-2421/64"9/16"£57.07
CMPB6545/16"-1817/64"1/2"£41.81
CMPB6555/16"-2417/64"1/2"£49.53
APOLLO VALVES -

Hex Nuts

StyleModelPrice (inc. VAT)
AC143800£7.63
AC170600£20.00
AC157300£7.19
AC156800£9.02
AC256700£8.29
AC176300£23.80
AC171006£151.05
AC175900£9.10
AC172700£9.32
AC168600£7.19
AC153300£10.92
AC142300£6.49
AC172600£6.99
AC168900£9.32
AC156700£6.69
AC165300£13.21
AC159400£6.35
AC165400£9.62
AC156600£6.57
AC174900£12.37
AC163806£10.58
AC157400£7.79
AC253506£31.12
AC254306£48.35
AC153200£9.32
FOREVERBOLT -

Hex Nuts

StyleModelDia./Thread SizeGradeHeightStyleSystem of MeasurementThread TypeWidthWidth Across FlatsPrice (inc. VAT)
AFBHEXN632P100#6-3218-87/64"Hex NutInchUNC (Coarse)-5/16"£80.35
BFB3HEXN632P50#6-323167/64"Hex NutInchUNC (Coarse)-5/16"£60.05
CFBHEXN832P100#8-3218-87/64"Hex NutInchUNC (Coarse)-5/16"£80.36
DFB3HEXN832P50#8-323167/64"Hex NutInchUNC (Coarse)-5/16"£63.93
EFB3HEXN1024P50#10-243161/8"Hex NutInchUNC (Coarse)-3/8"£65.65
FFBHEXN1024P100#10-2418-81/8"Hex NutInchUNC (Coarse)-3/8"£80.35
GFBHEXN18P51-818-855/64"Hex NutInchUNC (Coarse)-1 5/8"£32.82
HFB3HEXN18P51-831655/64"Hex NutInchUNC (Coarse)-1 5/8"£39.94
IFBHEXN18H1-818-863/64"HeavyInchUNC (Coarse)1.625"-£15.70
JFB3HEXN1213P251/2"-133167/16"Hex NutInchUNC (Coarse)-3/4"£45.79
KFBHEXN1213P251/2"-1318-87/16"Hex NutInchUNC (Coarse)-3/4"£41.92
LFB3HEXN1420P501/4"-203167/32"Hex NutInchUNC (Coarse)-7/16"£41.45
MFBHEXN1420P501/4"-20-7/32"HeavyInchUNC (Coarse)7/16"-£42.77
NFBHEXN3410P203/4"-1018-841/64"Hex NutInchUNC (Coarse)-1 1/8"£62.64
OFB3HEXN3410P203/4"-1031641/64"Hex NutInchUNC (Coarse)-1 1/8"£79.41
PFBHEXN3816P503/8"-1618-821/64"Hex NutInchUNC (Coarse)-9/16"£53.56
QFB3HEXN3816P503/8"-1631621/64"Hex NutInchUNC (Coarse)-9/16"£57.47
RFBHEXN5811P255/8"-1118-835/64"Hex NutInchUNC (Coarse)-15/16"£54.42
SFB3HEXN5811P255/8"-1131635/64"Hex NutInchUNC (Coarse)-15/16"£63.50
TFBHEXN51618P505/16"-18-17/64"HeavyInchUNC (Coarse)1/2"-£53.56
UFB3HEXN516P505/16"-1831617/64"Hex NutInchUNC (Coarse)-1/2"£52.70
VFB3HEXN789P57/8"-93163/4"Hex NutInchUNC (Coarse)-1 5/16"£30.37
WFBHEXN789P57/8"-918-83/4"Hex NutInchUNC (Coarse)-1 5/16"£25.76
XFB3HEXN71614P257/16"-143163/8"Hex NutInchUNC (Coarse)-11/16"£39.29
YFBHEXN71614P257/16"-1418-83/8"Hex NutInchUNC (Coarse)-11/16"£34.47
VULCAN HART -

Hex Bolts

StyleModelPrice (inc. VAT)
A730053£1.59
RFQ
A944165-2£29.88
RFQ
APPROVED VENDOR -

Hex Nut Machine Screw

StyleModelDia./Thread SizeHeightWidthPrice (inc. VAT)
A325120-PG#6-327/64"5/16"£18.26
A325140-PG#8-321/8"11/32"£18.18
GRAINGER -

Hex Nut 1-1/4 Carbon Steel

StyleModelFinishGradeRockwell HardnessThread SizePrice (inc. VAT)
AU04225.125.0001Hot Dipped GalvanizedDHC24 to C381 1/4-7£71.34
BU04025.125.0001PlainCB78 to C381 1/4-7£31.72
CU04026.125.0001PlainA563C24 to C381.25mm£24.88
APPROVED VENDOR -

Brass Hex Nut, Plain Finish

StyleModelDia./Thread SizeHeightRockwell HardnessSystem of MeasurementThread SizeThread TypeTypeWidthPrice (inc. VAT)
A6CA95-8mm--M10 x 1.5MetricFull17mm£44.57
B5ZY67-29mm--M36 x 4MetricFull55mm£57.03
C1WA57#1-723/64"-Inch-UNCMachine Screw5/32"£8.90
D1WA59#2-561/16"-Inch-UNCMachine Screw3/16"£7.28
D1WA63#4-403/32"-Inch-UNCMachine Screw1/4"£8.85
E1WA67#6-327/64"-Inch-UNCMachine Screw5/16"£16.11
F25RM6-32#6-327/64"F55 Min.Inch-UNC-5/16"£3,313.79
D1WA69#8-321/8"-Inch-UNCMachine Screw11/32"£17.28
G25RM8-32#8-321/8"F55 Min.Inch-UNC-11/32"£3,549.61
H25RM10-24#10-241/8"F55 Min.Inch-UNC-3/8"£3,202.10
D1WA71#10-241/8"-Inch-UNCMachine Screw3/8"£19.41
I25RM10-32#10-321/8"F55 Min.Inch-UNF-3/8"£3,226.93
J1WA73#10-321/8"-Inch-UNFMachine Screw3/8"£19.53
K1WA75#12-245/32"-Inch-UNCMachine Screw7/16"£26.94
L25RM12-24#12-245/32"F55 Min.Inch-UNC-7/16"£2,705.66
M1WE421"-855/64"B75Inch-UNCFull1.5"£14.50
N1WY531"-863/64"B75Inch-UNCHeavy1.625"£20.82
N1WY451/2"-1331/64"B75Inch-UNCHeavy7/8"£31.77
N1WE301/2"-137/16"B75Inch-UNCFull3/4"£41.17
O1WE321/2"-207/16"B75Inch-UNFFull3/4"£53.57
P1WE141/4"-207/32"B75Inch-UNCFull7/16"£40.11
Q25RM1/4-201/4"-203/16"F55 Min.Inch-UNC-7/16"£3,053.16
R2WA211/4"-203/16"-Inch-UNCMachine Screw7/16"£38.20
S1WY371/4"-2015/64"B75Inch-UNCHeavy1/2"£57.92
N1WE161/4"-287/32"B75Inch-UNFFull7/16"£50.50
APPROVED VENDOR -

Low Carbon Steel Hex Nut, Furnace Black Finish

StyleModelDia./Thread SizeHeightThread SizeWidthPrice (inc. VAT)
A6CA42M3 x 0.52.4mmM3 x 0.55.5mm£41.57
B6CA43M4 x 0.73.2mmM4 x 0.77mm£16.16
GRAINGER -

Steel Hex Nut, Zinc Finish

StyleModelDia./Thread SizeFinishHeightThread TypeWidthPrice (inc. VAT)
AM01320.030.0001M3 x 0.5Zinc Yellow2.4mmMetric5.5mm£5.15
BM01320.040.0001M4 x 0.7Zinc Yellow3.2mmMetric7mm£6.42
AM01120.040.0075M4-0.75Plain3.2mmMetric Fine7mm£730.78
CM01320.050.0001M5 x 0.8Zinc Yellow4mmMetric8mm£6.44
DM01320.060.0001M6 x 1Zinc Yellow5mmMetric10mm£4.02
AM01320.070.0001M7 x 1Zinc Yellow5.5mmMetric11mm£14.72
EM01320.080.0001M8 x 1.25Zinc Yellow6.5mmMetric13mm£11.86
FM01560.080.0001M8 x 1.25Hot Dipped Galvanized6.5mmMetric13mm£15.39
GM01320.100.0001M10 x 1.5Zinc Yellow8mmMetric17mm£22.20
HM01560.100.0001M10 x 1.5Hot Dipped Galvanized8mmMetric17mm£31.29
AM01320.120.0001M12 x 1.75Zinc Yellow10mmMetric19mm£23.07
IM01560.120.0001M12 x 1.75Hot Dipped Galvanized10mmMetric19mm£13.10
JM01560.140.0001M14 x 2Hot Dipped Galvanized11mmMetric22mm£29.34
KM01320.140.0001M14 x 2Zinc Yellow11mmMetric22mm£36.19
LM01560.160.0001M16 x 2Hot Dipped Galvanized13mmMetric24mm£23.62
AM01320.160.0001M16 x 2Zinc Yellow13mmMetric24mm£17.84
MM01120.160.0100M16-1Plain13mmMetric Fine24mm£31.20
NM01560.180.0001M18 x 2.5Hot Dipped Galvanized15mmMetric27mm£36.47
OM01320.180.0001M18 x 2.5Zinc Yellow15mmMetric27mm£28.80
PM01120.180.0100M18-1Plain15mmMetric Fine27mm£48.23
QM01120.180.0200M18-2Plain15mmMetric Fine27mm£26.77
RM01340.180.0200M18-2Zinc Yellow15mmMetric Fine27mm£11.64
SM01320.200.0001M20 x 2.5Zinc Yellow16mmMetric30mm£14.70
TM01560.200.0001M20 x 2.5Hot Dipped Galvanized16mmMetric30mm£15.40
UM01340.200.0200M20-2Zinc Yellow16mmMetric Fine30mm£12.01
APPROVED VENDOR -

Carbon Steel Hex Nut, Plain Finish

StyleModelBasic MaterialDia./Thread SizeGradeHeightProperty ClassRockwell HardnessSystem of MeasurementThread SizePrice (inc. VAT)
AM04180.080.0100Carbon SteelM8-1Class 10.96.5mm10.936MetricM8 x 1£26.56
AM01100.100.0001Carbon SteelM10 x 1.5Class 8.88mm8.830Metric-£16.05
BU04120.062.0001Carbon Steel5/8"-11835/64"-C33 to C39Inch-£17.47
CM01100.030.0001Carbon SteelM3 x 0.5Class 8.82.4mm8.830MetricM3 x 0.5£5.13
DU01120.050.0002Carbon Steel1/2"-2057/16"-C19 to C30Inch-£17.52
AM01100.050.0001Carbon SteelM5 x 0.8Class 8.84mm8.830Metric-£5.81
EU01100.025.0001Carbon Steel1/4"-2057/32"-C19 to C30Inch-£6.65
AM01100.070.0001Carbon SteelM7 x 1Class 8.85.5mm8.830MetricM7 x 1£11.83
FU01100.062.0001Carbon Steel5/8"-11535/64"-C19 to C30Inch-£14.63
GU04180.025.0002Carbon Steel1/4"-2887/32"8C33 to C39Inch-£4.13
HU01100.125.0001Carbon Steel1 1/4-7"51 1/16"-C19 to C30Inch8£28.09
IM01100.140.0001Carbon SteelM14 x 2Class 8.811mm8.830Metric-£21.87
AU04180.031.0002Carbon Steel5/16"-24817/64"8C33 to C39Inch-£9.69
AM01100.180.0001Carbon SteelM18 x 2.5Class 8.815mm8.830Metric-£41.91
JU04120.050.0001Carbon Steel1/2"-1387/16"8C33 to C39Inch-£17.11
KM01100.220.0001Carbon SteelM22-2.5Class 8.818mm8.830MetricM22 x 2.5£20.80
AU01120.025.0002Carbon Steel1/4"-2857/32"5C19 to C30Inch-£5.44
AM01100.270.0001Carbon SteelM27 x 3Class 8.822mm8.830Metric-£29.83
LHN2H1250007005Carbon Steel1 1/4-7"2H1 7/32"-HRC 24-35Inch8£36.83
MU04120.100.0001Carbon Steel1"-8855/64"8C33 to C39Inch-£14.29
AM01100.450.0001Carbon SteelM45-4.5Class 8.836mm8.830MetricM45 x 4.5£56.17
NU01120.087.0002Carbon Steel7/8"-1453/4"5C19 to C30Inch-£15.08
AM04180.100.0125Carbon SteelM10 x 1.25Class 10.98mm10.936Metric-£28.60
OU01100.056.0001Carbon Steel9/16"-12531/64"5C19 to C30Inch-£11.35
PU08160.043.0002Carbon Steel7/16"-2023/8"-B70 to B100Inch-£8.42
APPROVED VENDOR -

Carbon Steel Hex Nut, Zinc-Plated Finish

StyleModelDia./Thread SizeGradeHeightProperty ClassRockwell HardnessSystem of MeasurementThread SizeThread TypePrice (inc. VAT)
AU08110.125.00011 1/4-7"21 1/16"2B70 to B100Inch8UNC£17.85
AU01300.125.00011 1/4-7"51 1/16"-C19 to C30Inch8UNC£30.20
BU01330.125.00021 1/4-12"51 1/16"-C19 to C30Inch13UNF£31.52
CU08161.125.00021 1/4-12"21 1/16"2B70 to B100Inch13UNF£22.58
AU08110.112.00011 1/8-7"231/32"2B70 to B100Inch8UNC£16.14
DU01300.112.00011 1/8-7"531/32"5C19 to C30Inch8UNC£21.25
EU01330.112.00021 1/8-12"531/32"5C19 to C30Inch13UNF£14.75
FU08161.112.00021 1/8-12"231/32"2B70 to B100Inch13UNF£12.81
GU01300.100.00011"-8555/64"5C19 to C30Inch-UNC£10.92
AU08110.100.00011"-8255/64"2B70 to B100Inch-UNC£10.56
HU08110.050.00011/2"-1327/16"-B70 to B100Inch-UNC£15.28
IU01300.050.00011/2"-1357/16"5C19 to C30Inch-UNC£10.37
AU01330.050.00021/2"-2057/16"5C19 to C30Inch-UNF£18.84
AU08161.050.00021/2"-2027/16"-B70 to B100Inch-UNF£11.72
JU08110.025.00011/4"-2027/32"-B70 to B100Inch-UNC£6.06
AU01330.025.00021/4"-2857/32"-C19 to C30Inch-UNF£8.30
AU08161.025.00021/4"-2827/32"-B70 to B100Inch-UNF£5.00
KU08110.075.00013/4"-10241/64"-B70 to B100Inch-UNC£18.46
LU01300.075.00013/4"-10541/64"5C19 to C30Inch-UNC£18.55
MU08161.075.00023/4"-16241/64"-B70 to B100Inch-UNF£12.43
NU01330.075.00023/4"-16541/64"5C19 to C30Inch-UNF£23.78
AU08110.037.00013/8"-16221/64"-B70 to B100Inch-UNC£11.82
AU01300.037.00013/8"-16521/64"-C19 to C30Inch-UNC£13.22
AU08161.037.00023/8"-24221/64"-B70 to B100Inch-UNF£9.84
AU01330.037.00023/8"-24521/64"-C19 to C30Inch-UNF£15.72
APPROVED VENDOR -

Hex Nut Full M12

StyleModelDia./Thread SizeHeightWidthPrice (inc. VAT)
A6CB22M12 x 1.510mm19mm£30.48
B6CB20M12 x 1.2510mm19mm£32.17
C6CB24M14 x 1.511mm22mm£19.82
12...67

Hex Nuts

Hex nuts are metal fasteners having six sides. They can be used with bolts, washers, anchors, studs, threaded rods & screws. They are designed to fasten two or more wood / metal parts or create bolted joints to prevent movement. Raptor Supplies offers these hex nuts from brands like Grainger, Woodhead, Vulcan Hart, Banjo, Apollo, Fabory, Texas Pneumatic Tools, C Sherman Johnson, Disco, Dynaform & more.

Frequently Asked Questions

What standards do these nuts comply with?

  • ANSI
  • RoHS
  • ASME
  • DIN
  • FDA
  • ISO
  • SAE
  • UL

Why are hex nuts easy to turn?

Hexagonal-shaped nuts are easier to turn than other types of fasteners as they have six parallels and require less turning distance / radius. They only need one-sixth or 30 degrees of turning each time to reach the next flat parallel.

How are male or female NPSM threads installed to seal connections?

If you are mating NPSM threads with NPTF or NPT threads, make use of sealant or pipe tape to assure liquid and air-tight sealing.

What is the difference between internal and external drive styles?

The tool needed to tighten a fastener depends on its drive type. Deeper grooves and more points of contact on internal drive designs provide a sturdy grip and need less power to tighten. On the other hand, even lesser force is required to tighten external drive types as they may be secured using a wrench or socket.

How to determine fasteners' strength through Grade or Class?

  • SAE: They are used for Imperial fasteners. The higher the grade, the stronger the fastener. Fasteners with the same grade are designed to be used together. They include SAE Grade 2, 5 and 8 fasteners for light to heavy fastening / stress applications.
  • ISO: Metric fasteners have classifications according to ISO standards. The higher the class, the stronger the fastener. Fasteners with the same first digit are used together. They are available in ISO Class 4, 5, 6, 8, 10 and 12 for light duty fastening or high-stress applications.
  • ASTM: ASTM grades fasteners based on strength. They are available in ASTM Grade 2H, 7, 8, 8M and DH for high strength, stress, pressure & temperature applications. ASTM Grade C units are medium-strength steel nuts.
  • ASME: They are available in Grade F & G for medium or high-stress applications.

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