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Machine Bolts

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Machine bolts are used to fasten two pieces of wood or metals in manufacturing & construction applications. Raptor Supplies offers machine bolts from brands like Proto, ...Read more

StyleModelBolt SizeOverall LengthThread Size
A50X175HEBBOX1/2"1.75"1/2-13
RFQ
A50X225HEBBOX1/2"2.25"1/2-13
RFQ
A50X100HEBBOX1/2"1"1/2-13
RFQ
A50X125HEBBOX1/2"1.25"1/2-13
RFQ
A50X150HEBBOX1/2"1-1/2"1/2-13
RFQ
A50X200HEBBOX1/2"2"1/2-13
RFQ
A50X250HEBBOX1/2"2.50"1/2-13
RFQ
A50X300HEBBOX1/2"3"1/2-13
RFQ
A50X75HEBBOX1/2"3/4"1/2-13
RFQ
A38X100HEBBOX3/8"1"3/8-16"
RFQ
A38X150HEBBOX3/8"1-1/2"3/8-16"
RFQ
A38X200HEBBOX3/8"2"3/8-16"
RFQ
FABORY -

Bolts

StyleModelDia./Thread SizeHead Dia.Head HeightPrice (ex. VAT)
AB08360.025.00751/4"-200.969"0.078"€235.74
AB08360.025.01001/4"-200.969"0.078"€457.79
AB08360.025.01251/4"-200.969"0.078"€214.45
AB08360.025.01501/4"-200.969"0.078"€363.61
AB08360.025.01751/4"-200.969"0.078"€1,963.46
AB08360.025.03001/4"-200.969"0.078"€449.30
AB08360.037.02003/8"-161.312"0.125"€273.58
AB08360.031.01255/16"-181.188"0.094"€285.48
AB08360.031.01505/16"-181.188"0.094"€272.85
AB08360.031.01755/16"-181.188"0.094"€268.69
AB08360.031.02505/16"-181.188"0.094"€328.63
AB08360.031.03005/16"-181.188"0.094"€579.68
L9 -

Hex Head Cap Screws

StyleModelDia./Thread SizeFastener LengthHead HeightHead WidthLengthThread StyleThread TypePrice (ex. VAT)
A4409571 1/2"-6101 1/32"2.25"10 "Partially ThreadedUNC (Coarse)€3,242.62
RFQ
B4409531 1/2"-651 1/32"2.25"5 "Partially ThreadedUNC (Coarse)€2,772.62
RFQ
A4409561 1/2"-681 1/32"2.25"8 "Partially ThreadedUNC (Coarse)€2,746.74
RFQ
A4409551 1/2"-671 1/32"2.25"7 "Partially ThreadedUNC (Coarse)€2,311.23
RFQ
B4409541 1/2"-661 1/32"2.25"6 "Partially ThreadedUNC (Coarse)€2,832.98
RFQ
B4409521 1/2"-641 1/32"2.25"4 "Fully ThreadedUNC (Coarse)€2,354.35
RFQ
A4409581 1/2"-6121 1/32"2.25"12 "Partially ThreadedUNC (Coarse)€2,483.71
RFQ
C4409721 1/2"-12121 1/32"2.25"12 "Partially ThreadedUNC (Coarse)€2,677.75
RFQ
D4409591 1/2"-1241 1/32"2.25"4 "Fully ThreadedUNF (Fine)€2,742.43
RFQ
C4409681 1/2"-12101 1/32"2.25"10 "Partially ThreadedUNF (Fine)€3,471.16
RFQ
E4409641 1/2"-1281 1/32"2.25"8 "Partially ThreadedUNF (Fine)€2,393.16
RFQ
C4409621 1/2"-1271 1/32"2.25"7 "Partially ThreadedUNF (Fine)€2,022.33
RFQ
D4409611 1/2"-1261 1/32"2.25"6 "Partially ThreadedUNF (Fine)€2,953.72
RFQ
A4409361 1/4"-71055/64"1.875"10 "Partially ThreadedUNC (Coarse)€1,949.02
RFQ
A4409371 1/4"-71155/64"1.875"11 "Partially ThreadedUNC (Coarse)€2,440.59
RFQ
A4409381 1/4"-71255/64"1.875"12 "Partially ThreadedUNC (Coarse)€2,811.42
RFQ
B4409291 1/4"-74 1/255/64"1.875"4 1/2"Partially ThreadedUNC (Coarse)€1,302.22
RFQ
B4409311 1/4"-75 1/255/64"1.875"5 1/2"Partially ThreadedUNC (Coarse)€1,194.42
RFQ
B4409321 1/4"-7655/64"1.875"6 "Partially ThreadedUNC (Coarse)€1,276.35
RFQ
A4409331 1/4"-7755/64"1.875"7 "Partially ThreadedUNC (Coarse)€1,444.52
RFQ
B4409301 1/4"-7555/64"1.875"5 "Partially ThreadedUNC (Coarse)€1,056.44
RFQ
A4409341 1/4"-7855/64"1.875"8 "Partially ThreadedUNC (Coarse)€1,608.38
RFQ
F4409261 1/4"-7355/64"1.875"3 "Fully ThreadedUNC (Coarse)€1,466.08
RFQ
F4409271 1/4"-73 1/255/64"1.875"3 1/2"Fully ThreadedUNC (Coarse)€1,090.94
RFQ
B4409281 1/4"-7455/64"1.875"4 "Partially ThreadedUNC (Coarse)€1,198.74
RFQ
ACCURATE MANUFACTURED PRODUCTS GROUP -

Hex Head Cap Screws

StyleModelDia./Thread SizeFastener LengthHead HeightHead WidthLengthThread StylePrice (ex. VAT)
AZS616M6X16M6x1164 mm10 mm16mmFully Threaded€12.28
AZS616M6X25M6x1254 mm10 mm25mmPartially Threaded€14.47
AZS616M6X40M6x1404 mm10 mm40mmPartially Threaded€18.30
AZS616M6X10M6x1104 mm10 mm10mmFully Threaded€11.45
AZS616M6X12M6x1124 mm10 mm12mmFully Threaded€11.38
AZS616M6X30M6x1304 mm10 mm30mmPartially Threaded€16.27
AZS616M6X20M6x1204 mm10 mm20mmPartially Threaded€13.76
AZS616M8X40M8x1.25405 mm13 mm40mmPartially Threaded€24.37
AZS616M8X35M8x1.25355 mm13 mm35mmPartially Threaded€22.44
AZS616M8X30M8x1.25305 mm13 mm30mmPartially Threaded€17.62
AZS616M8X25M8x1.25255 mm13 mm25mmPartially Threaded€16.42
AZS616M8X20M8x1.25205 mm13 mm20mmPartially Threaded€15.10
AZS616M8X16M8x1.25165 mm13 mm16mmFully Threaded€14.35
AZS616M8X50M8x1.25505 mm13 mm50mmPartially Threaded€33.23
AZS616M10X30M10x1.5306 mm16 mm30mmPartially Threaded€37.95
AZS616M10X50M10x1.5506 mm16 mm50mmPartially Threaded€56.17
AZS616M10X40M10x1.5406 mm16 mm40mmPartially Threaded€53.32
AZS616M10X35M10x1.5356 mm16 mm35mmPartially Threaded€51.49
AZS616M10X25M10x1.5256 mm16 mm25mmPartially Threaded€33.23
AZS616M12X50M12x1.75508 mm18 mm50mmPartially Threaded€135.54
AZS616M12X40M12x1.75408 mm18 mm40mmPartially Threaded€79.22
AZS616M12X35M12x1.75358 mm18 mm35mmPartially Threaded€74.76
AZS616M12X30M12x1.75308 mm18 mm30mmPartially Threaded€62.52
LISLE -

Bolts

StyleModelPrice (ex. VAT)
ALS/13790€47.09
RFQ
ALS/34410€6.10
RFQ
ALS/35660€0.84
RFQ
ALS/45310€6.73
RFQ
ALS/45590€1.01
RFQ
ALS/45610€1.19
RFQ
ALS/45620€1.01
RFQ
ALS/45640€1.01
RFQ
ALS/56420€5.54
RFQ
ALS/57210€2.52
RFQ
ALS/62350€16.54
RFQ
ALS/12890€1.12
RFQ
BLS/19250€54.87
RFQ
ALS/38290€2.41
RFQ
ALS/45540€1.06
RFQ
ALS/71410€3.86
RFQ
FABORY -

Square Head Bolts

StyleModelDia./Thread SizeFastener LengthHead HeightHead WidthLengthThread LengthPrice (ex. VAT)
AM01030.060.0016M6x1166 mm6 mm16mm16mm€74.23
BM01030.060.0050M6x1506 mm6 mm50mm50mm€148.11
CM01030.060.0040M6x1406 mm6 mm40mm40mm€110.70
CM01030.060.0030M6x1306 mm6 mm30mm30mm€98.32
AM01030.060.0020M6x1206 mm6 mm20mm20mm€90.33
BL01030.080.0050M8x1.25508 mm8 mm50mm50mm€2,194.23
CM01030.080.0035M8x1.25358 mm8 mm35mm35mm€168.67
CM01030.080.0030M8x1.25308 mm8 mm30mm30mm€156.75
AM01030.080.0025M8x1.25258 mm8 mm25mm25mm€137.38
AM01030.080.0020M8x1.25208 mm8 mm20mm20mm€118.05
AM01030.080.0016M8x1.25168 mm8 mm16mm16mm€107.99
BM01030.080.0060M8x1.25608 mm8 mm60mm60mm€233.66
BL01030.080.0060M8x1.25608 mm8 mm60mm60mm€1,435.51
BM01030.080.0050M8x1.25508 mm8 mm50mm50mm€388.03
CM01030.080.0040M8x1.25408 mm8 mm40mm40mm€188.96
DM01030.100.0016M10x1.51610 mm10 mm16mm16mm€93.97
DM01030.100.0020M10x1.52010 mm10 mm20mm20mm€105.19
EM01030.100.0025M10x1.52510 mm10 mm25mm25mm€113.27
EM01030.100.0030M10x1.53010 mm10 mm30mm30mm€121.85
EM01030.100.0035M10x1.53510 mm10 mm35mm35mm€218.94
EM01030.100.0040M10x1.54010 mm10 mm40mm40mm€178.07
FM01030.100.0050M10x1.55010 mm10 mm50mm50mm€160.43
GM01030.100.0070M10x1.57010 mm10 mm70mm70mm€210.31
GM01030.100.0080M10x1.58010 mm10 mm80mm80mm€228.90
FM01030.100.0060M10x1.56010 mm10 mm60mm60mm€190.49
FABORY -

Elevator Bolts

StyleModelDia./Thread SizeFastener FinishFastener LengthFinishHead Dia.Head HeightLengthRockwell HardnessPrice (ex. VAT)
AB08360.025.02501/4"-20Plain2 1/2Plain0.969"0.078"2 1/2"-€210.63
AU08360.025.02501/4"-20Plain2 1/2Plain0.969"0.078"2 1/2"Max B100€73.59
AB08360.025.02001/4"-20Plain2Plain0.969"0.078"2 "-€463.14
BB08361.025.01001/4"-20Zinc Plated1Zinc Plated0.969"0.078"1 "-€532.60
BB08361.025.01501/4"-20Zinc Plated1 1/2Zinc Plated0.969"0.078"1 1/2"--
RFQ
CB08361.025.02001/4"-20Zinc Plated2Zinc Plated0.969"0.078"2 "-€467.66
CU08361.025.02501/4"-20Zinc Plated2 1/2Zinc Plated0.969"0.078"2 1/2"Max B100€78.39
CU08361.025.01751/4"-20Zinc Plated1 3/4Zinc Plated0.969"0.078"1 3/4"Max B100€52.19
BU08361.025.01501/4"-20Zinc Plated1 1/2Zinc Plated0.969"0.078"1 1/2"Max B100€48.46
BU08361.025.01001/4"-20Zinc Plated1Zinc Plated0.969"0.078"1 "B69 to B100€41.52
DU08360.025.00751/4"-20Plain3/4Plain0.969"0.078"3/4"Max B100€46.26
DU08360.025.01001/4"-20Plain1Plain0.969"0.078"1 "Max B100€47.71
DU08360.025.01501/4"-20Plain1 1/2Plain0.969"0.078"1 1/2"Max B100€58.12
AU08360.025.02001/4"-20Plain2Plain0.969"0.078"2 "Max B100€61.36
AU08360.025.02251/4"-20Plain2 1/4Plain0.969"0.078"2 1/4"Max B100€65.55
AU08360.025.03001/4"-20Plain3Plain0.969"0.078"3 "Max B100€83.76
AU08360.025.01751/4"-20Plain1 3/4Plain0.969"0.078"1 3/4"Max B100€77.43
CU08361.025.02001/4"-20Zinc Plated2Zinc Plated0.969"0.078"2 "Max B100€55.06
BB08361.025.01251/4"-20Zinc Plated1 1/4Zinc Plated0.969"0.078"1 1/4"--
RFQ
CB08361.025.01751/4"-20Zinc Plated1 3/4Zinc Plated0.969"0.078"1 3/4"-€442.08
CB08361.025.02501/4"-20Zinc Plated2 1/2Zinc Plated0.969"0.078"2 1/2"-€400.37
CB08361.025.03001/4"-20Zinc Plated3Zinc Plated0.969"0.078"3 "-€357.50
CU08361.025.03001/4"-20Zinc Plated3Zinc Plated0.969"0.078"3 "Max B100€91.45
BU08361.025.01251/4"-20Zinc Plated1 1/4Zinc Plated0.969"0.078"1 1/4"Max B100€53.04
BU08361.025.00751/4"-20Zinc Plated3/4Zinc Plated0.969"0.078"3/4"Max B100€37.48
FABORY -

Step Bolts

StyleModelDia./Thread SizeFastener LengthHead Dia.Head HeightLengthSquare HeightSquare WidthPrice (ex. VAT)
AU08350.019.0150#10-241 1/20.625" to 0.656"0.094" to 0.114"1 1/2"0.094" to 0.125"0.185" to 0.199"€195.24
BB08350.025.01001/4"-2010.813" to 0.844"0.125" to 0.145"1 "0.125" to 0.156"0.245" to 0.260"€606.42
CU08350.025.02001/4"-2020.813" to 0.844"0.125" to 0.145"2 "0.125" to 0.156"0.245" to 0.260"€61.64
AB08350.025.01251/4"-201 1/40.813" to 0.844"0.125" to 0.145"1 1/4"0.125" to 0.156"0.245" to 0.260"€576.89
AU08350.025.01251/4"-201 1/40.813" to 0.844"0.125" to 0.145"1 1/4"0.125" to 0.156"0.245" to 0.260"€49.17
BU08350.025.01001/4"-2010.813" to 0.844"0.125" to 0.145"1 "0.125" to 0.156"0.245" to 0.260"€45.67
AU08350.025.01501/4"-201 1/20.813" to 0.844"0.125" to 0.145"1 1/2"0.125" to 0.156"0.245" to 0.260"€51.56
DB08350.025.01501/4"-201 1/20.813" to 0.844"0.125" to 0.145"1 1/2"0.125" to 0.156"0.245" to 0.260"€508.65
CB08350.025.02001/4"-2020.813" to 0.844"0.125" to 0.145"2 "0.125" to 0.156"0.245" to 0.260"€709.33
EB08350.037.01503/8"-161 1/21.219" to 1.219"0.188" to 0.208"1 1/2"0.188" to 0.219"0.368" to 0.388"€659.90
FU08350.037.01253/8"-161 1/41.219" to 1.219"0.188" to 0.208"1 1/4"0.188" to 0.219"0.368" to 0.388"€111.21
CU08350.037.02503/8"-162 1/21.219" to 1.219"0.188" to 0.208"2 1/2"0.188" to 0.219"0.368" to 0.388"€39.90
GU08350.037.02003/8"-1621.219" to 1.219"0.188" to 0.208"2 "0.188" to 0.219"0.368" to 0.388"€113.35
AU08350.037.01503/8"-161 1/21.219" to 1.219"0.188" to 0.208"1 1/2"0.188" to 0.219"0.368" to 0.388"€134.76
CU08350.037.03003/8"-1631.219" to 1.219"0.188" to 0.208"3 "0.188" to 0.219"0.368" to 0.388"€118.67
GB08350.037.02003/8"-1621.219" to 1.219"0.188" to 0.208"2 "0.188" to 0.219"0.368" to 0.388"€451.46
FB08350.037.01253/8"-161 1/41.219" to 1.219"0.188" to 0.208"1 1/4"0.188" to 0.219"0.368" to 0.388"€334.88
BU08350.031.01255/16"-181 1/41.000" to 1.031"0.156" to 0.176"1 1/4"0.156" to 0.187"0.307" to 0.324"€69.03
AU08350.031.01505/16"-181 1/21.000" to 1.031"0.156" to 0.176"1 1/2"0.156" to 0.187"0.307" to 0.324"€65.27
HU08350.031.02005/16"-1821.000" to 1.031"0.156" to 0.176"2 "0.156" to 0.187"0.307" to 0.324"€120.46
IU08350.031.00755/16"-183/41.000" to 1.031"0.156" to 0.176"3/4"0.156" to 0.187"0.307" to 0.324"€110.73
JB08350.031.01005/16"-1811.000" to 1.031"0.156" to 0.176"1 "0.156" to 0.187"0.307" to 0.324"€616.82
HB08350.031.02005/16"-1821.000" to 1.031"0.156" to 0.176"2 "0.156" to 0.187"0.307" to 0.324"€257.67
JU08350.031.01005/16"-1811.000" to 1.031"0.156" to 0.176"1 "0.156" to 0.187"0.307" to 0.324"€65.43
FABORY -

Heavy Hex Bolts

StyleModelDia./Thread SizeFastener FinishFastener LengthFinishHead HeightHead WidthLengthRockwell HardnessPrice (ex. VAT)
AB04000.125.04501 1/4"-7Plain4 1/2Plain27/32"2"4 1/2"-€261.20
AU04000.125.04001 1/4"-7Plain4Plain27/32"2"4 "Max B95€105.58
AU04000.125.04501 1/4"-7Plain4 1/2Plain27/32"2"4 1/2"Max B95€112.86
AU04000.125.05001 1/4"-7Plain5Plain27/32"2"5 "Max B95€122.28
BU04000.125.06001 1/4"-7Plain6Plain27/32"2"6 "Max B95€139.99
CU04200.125.06001 1/4"-7Hot Dipped Galvanized6Hot Dipped Galvanized27/32"2"6 "Max B95€189.77
AB04000.125.04001 1/4"-7Plain4Plain27/32"2"4 "-€244.35
AU04000.112.04501 1/8"-7Plain4 1/2Plain3/4"1 13/16"4 1/2"Max B95€79.19
AU04000.112.05001 1/8"-7Plain5Plain3/4"1 13/16"5 "Max B95€94.59
DU04200.112.05001 1/8"-7Hot Dipped Galvanized5Hot Dipped Galvanized3/4"1 13/16"5 "Max B95€103.22
DB04200.112.05001 1/8"-7Hot Dipped Galvanized5Hot Dipped Galvanized3/4"1 13/16"5 "-€309.73
AB04000.112.04501 1/8"-7Plain4 1/2Plain3/4"1 13/16"4 1/2"-€274.76
AB04000.112.05001 1/8"-7Plain5Plain3/4"1 13/16"5 "-€328.32
AU04000.112.04001-1/8"-7Plain4Plain3/4"1-13/16"4"Max B95€73.80
DU04200.100.03501-8Hot Dipped Galvanized3 1/2Hot Dipped Galvanized43/64"1 5/8"3 1/2"Max B95€64.16
DU04200.100.04501-8Hot Dipped Galvanized4 1/2Hot Dipped Galvanized43/64"1 5/8"4 1/2"Max B95€64.81
BB04000.100.02251-8Plain2 1/4Plain43/64"1 5/8"2 1/4"-€299.96
EB04000.100.03001-8Plain3Plain43/64"1 5/8"3 "-€247.30
AB04000.100.03251-8Plain3 1/4Plain43/64"1 5/8"3 1/4"-€234.37
AB04000.100.03501-8Plain3 1/2Plain43/64"1 5/8"3 1/2"-€258.96
AB04000.100.04501-8Plain4 1/2Plain43/64"1 5/8"4 1/2"-€194.19
DU04200.100.04001-8Hot Dipped Galvanized4Hot Dipped Galvanized43/64"1 5/8"4 "Max B95€69.88
FB04000.100.05001-8Plain5Plain43/64"1 5/8"5 "-€235.26
FU04000.100.05001-8Plain5Plain43/64"1 5/8"5 "Max B95€67.80
AU04000.100.04001-8Plain4Plain43/64"1 5/8"4 "Max B95€74.60
TEXAS PNEUMATIC TOOLS -

Handle Bolts

Texas Pneumatic Tools handle bolts are suitable for connecting parts in machines for manufacturing & automotive applications. Selected models feature plain & threaded combination stem for maximising reach.

StyleModelPrice (ex. VAT)
A43153€92.36
RFQ
BSI7515€92.36
RFQ
C250027-485€8.90
RFQ
C68524155€8.90
RFQ
D43160€78.55
RFQ
C4244€8.90
RFQ
CY10430190€8.90
RFQ
ETX4B485-GR 5€8.90
RFQ
F67014€79.46
RFQ
F131503002€79.46
RFQ
A7515€92.36
RFQ
G6925€52.75
RFQ
A1651€92.36
RFQ
D2492€78.55
RFQ
CTX4B485-GR 8€8.90
RFQ
HTX-37014€79.46
RFQ
C9245-9983-71€8.90
RFQ
THOMAS & BETTS -

Machine Bolts

StyleModelPrice (ex. VAT)
ARCS10-10X€4.89
RFQ
ARCS10-6FLX€4.98
RFQ
APPROVED VENDOR -

Square Head Bolt Med Carbon 3/8-16, 50PK

ModelItemPrice (ex. VAT)
SQHDG5FTZY38161AC6GJZ€167.04
APPROVED VENDOR -

Square Head Bolt Med Carbon 3/8-16, 50PK

ModelItemPrice (ex. VAT)
SQHDG5FTZY3816112AC6GKA€170.23
CRETORS -

Drive Bolt, Stainless Steel Mixer

ModelItemPrice (ex. VAT)
1681CF2JJQ€117.93
PROTO -

Hex Socket Head Bolt

ModelItemPrice (ex. VAT)
30R200053CH9ABR€4.29
RFQ
PROTO -

Hex Socket Head Bolt

ModelItemPrice (ex. VAT)
30R200052CH9ABQ€7.65
RFQ
LISLE -

Replacement Hook And Bolts

ModelItemPrice (ex. VAT)
LS/49140CD8FYV€17.87
RFQ
LISLE -

Harmonic Balancer Body

ModelItemPrice (ex. VAT)
LS/45510CD8FWD€21.80
RFQ
BURNDY -

Socket And Nut Assembly, 3-7/16 Inch Length

ModelItemPrice (ex. VAT)
Z28NRCF4EEA-
RFQ
BURNDY -

Socket And Nut Assembly, 3-11/16 Inch Length

ModelItemPrice (ex. VAT)
Z34NRCF4EDY-
RFQ
BURNDY -

Washer, 1/2 Inch Size, Stainless Steel

ModelItemPrice (ex. VAT)
50X106BWSSCF4BBF-
RFQ
12

Machine Bolts

Machine bolts are used to fasten two pieces of wood or metals in manufacturing & construction applications. Raptor Supplies offers machine bolts from brands like Proto, Texas Pneumatic Tools, Thomas & Betts, Fabory, Vulcan Hart and more. They can be paired up with a threaded nut to be inserted into pre-drilled holes and provide tightening torque for joining materials together.

Features

  • A machine bolt is mainly divided into 2 parts: the head and the threaded portion.
  • The head is available in multiple drive styles for driving the screw in / out from the surface and sticking out of the surface.
  • The threaded portion starts just below the head for mating with a nut after installation.
  • This nut & bolt assembly creates compression force that holds two loose objects together and can be disassembled easily when required.
  • Selected bolt heads are equipped with a square neck for preventing accidental spinning / opening due to vibration.
  • Most machine bolts are fully threaded (but some are partially threaded) for preventing loosening, rotation, breakage & bending caused by friction-induced overheating or sideway forces.
  • These bolts can be fitted with a washer for increasing the surface area and distributing the attachment force applied.
  • Fabory machine bolts are available in hex head, square head, step & elevator bolt variants.
  • Texas Pneumatic Tools machine bolts have hexagonal / square heads for easy installation. Selected models may also have a long stem for fastening parts in industrial machinery.

Frequently Asked Questions

What is the difference between machine bolts and machine screws?

Machine bolts are often confused with machine screws. Generally, machine screws are smaller in size compared to machine bolts, but are fully threaded. Machine bolts have a flat tip, not a pointed / tapered tip as seen in screws. Screws are typically used in pre-tapped holes or driven into materials for creating their own threads when tightened. In contrast, machine bolts are often paired with nuts at the end of the bolt for torquing during installation. Nuts are not generally mated with screws.

What are the thread fits or classes in these machine bolts?

Thread fit grades or classes of a fastener indicate the degree of looseness or tightness of mating threads. Generally, the higher the class number, the tighter the fit of the attached components (like nuts). Lower thread fit grades / classes are suitable for applications requiring quick assembly & disassembly. Higher thread classes are ideal for close tolerances, safety & strength.

What do the strength grades / classes mean in machine bolts?

  • The grade or class of a machine bolt denotes its strength & compatibility with the respective nut.
  • Generally, the higher the grade, the higher the strength of the fastener.
  • SAE grades are used for Imperial-sized bolts. Bolts having the same SAE strength grade as a nut should be used together.
  • ISO classes are used for Metric-sized bolts. Bolts having the same first digit as a nut are meant to be used together.
  • ASTM grades are based on factors like strength, high pressures & high temperatures.

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