TB WOODS V-Belt Pulleys

Used for transmitting power between two parallel axes and are compatible with V-belt Sections 4L, 5L, A, AX, B, and BX

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TB Woods V-belt pulleys are designed for transmitting power from motors to belts, fans and pumps. These units feature V-shaped grooves that correspond with V-shaped belts to prevent slippage and misalignment and provide maximum friction and torque during operation.
TB WOODS -

FHPQTBushed V-Belt Sheaves

StyleModelBore TypeOutside Dia.4l, A, Or Ax Belt Pitch Dia.For Belt Section5l, B, Or Bx Belt Pitch Dia.Industry NumberDatum Dia.Max. RpmPrice
A2AK39------3 1/2"6670 RPM€130.43
BAK44-4 1/4"----4"5890 RPM€72.18
C2AK94-9 1/4"----9"2710 RPM€245.27
D2BK70Bushed6 3/4"6"4L, 5L, A, Ax, B, Bx6.4"2BK706 2/5"3710 RPM€178.09
A2BK50Bushed4 3/4"4"4L, 5L, A, Ax, B, Bx4.4"2BK504 2/5"5270 RPM€130.05
C2BK100Bushed9 3/4"9"4L, 5L, A, Ax, B, Bx9.4"2BK1009 2/5"2570 RPM€250.03
C2BK110Bushed10 3/4"10"4L, 5L, A, Ax, B, Bx10.4"2BK11010 2/5"2330 RPM€272.80
C2BK120Bushed11 3/4"11"4L, 5L, A, Ax, B, Bx11.4"2BK12011 2/5"2130 RPM€309.15
C2BK130Bushed12 3/4"12"4L, 5L, A, Ax, B, Bx12.4"2BK13012 2/5"1970 RPM€275.90
C2BK140Bushed13 3/4"13"4L, 5L, A, Ax, B, Bx13.4"2BK14013 2/5"1820 RPM€309.81
C2BK160Bushed15 3/4"15"4L, 5L, A, Ax, B, Bx15.4"2BK16015 2/5"1590 RPM€344.80
C2BK190Bushed18 3/4"18"4L, 5L, A, Ax, B, Bx18.4"2BK19018 2/5"1340 RPM€364.82
A2BK32Bushed3.35"2.6"4L, 5L, A, Ax, B, Bx3"2BK323"7470 RPM€115.23
A2BK40Bushed3.95"3.2"4L, 5L, A, Ax, B, Bx3.6"2BK403 3/5"6330 RPM€112.86
A2BK45Bushed4 1/4"3 1/2"4L, 5L, A, Ax, B, Bx3.9"2BK453.9"5890 RPM€115.83
A2BK47Bushed4.45"3.7"4L, 5L, A, Ax, B, Bx4.1"2BK474.1"5620 RPM€127.71
E2BK55Bushed5 1/4"4 1/2"4L, 5L, A, Ax, B, Bx4.9"2BK554.9"4770 RPM€154.60
A2BK52Bushed4.95"4.2"4L, 5L, A, Ax, B, Bx4.6"2BK524 3/5"5060 RPM€133.36
FBK90Bushed8 3/4"8"4L, 5L, A, Ax, B, Bx8.4"BK908 2/5"2860 RPM€121.28
E2BK57Bushed5.45"4.7"4L, 5L, A, Ax, B, Bx5.1"2BK575.1"4590 RPM€157.57
E2BK60Bushed5 3/4"5"4L, 5L, A, Ax, B, Bx5.4"2BK605 2/5"4350 RPM€160.67
E2BK62Bushed5.95"5.2"4L, 5L, A, Ax, B, Bx5.6"2BK625 3/5"4210 RPM€152.03
D2BK65Bushed6 1/4"5 1/2"4L, 5L, A, Ax, B, Bx5.9"2BK655.9"4000 RPM€175.78
D2BK67Bushed6.45"5.7"4L, 5L, A, Ax, B, Bx6.1"2BK676.1"3880 RPM€178.80
C2BK80Bushed7 3/4"7"4L, 5L, A, Ax, B, Bx7.4"2BK807 2/5"3230 RPM€207.61
TB WOODS -

Classical V-Belt Sheaves

StyleModelOutside Dia.Bore TypeIndustry NumberFor Belt SectionFor Bushing Size4l, A, Or Ax Belt Pitch Dia.5l, B, Or Bx Belt Pitch Dia.C Or Cx Belt Pitch Dia.Price
A1608D-Quick Disconnect Bushing------€4,004.40
B2408C-Quick Disconnect Bushing------€2,143.51
C567B-Quick Disconnect Bushing------€445.58
D345B-Quick Disconnect Bushing------€201.09
E2404D-Quick Disconnect Bushing-------
RFQ
F15510D-Quick Disconnect Bushing------€4,825.81
G2406C-Quick Disconnect Bushing------€1,718.00
H346B-Quick Disconnect Bushing------€278.30
I344B3 3/4"Bushed344B4L, 5L, A, Ax, B, BxSD3"3.4"-€175.91
J342B3 3/4"Bushed342B4L, 5L, A, Ax, B, BxSH3"3.4"-€119.36
K343B3 3/4"Bushed343B4L, 5L, A, Ax, B, BxSH3"3.4"-€138.31
L341B3 3/4"Bushed341B4L, 5L, A, Ax, B, BxSH3"3.4"-€66.83
H366B3.95"Quick Disconnect Bushing------€283.84
L361B3.95"Bushed361B4L, 5L, A, Ax, B, BxSH3.2"3.6"-€84.93
K363B3.95"Bushed363B4L, 5L, A, Ax, B, BxSH3.2"3.6"-€115.62
J362B3.95"Bushed362B4L, 5L, A, Ax, B, BxSH3.2"3.6"-€125.73
D365B3.95"Quick Disconnect Bushing------€212.50
I364B3.95"Quick Disconnect Bushing------€184.54
I444B4 3/4"Bushed444B4L, 5L, A, Ax, B, BxSD4"4.4"-€201.67
M443B4 3/4"Bushed443B4L, 5L, A, Ax, B, BxSH4"4.4"-€142.63
D445B4 3/4"Quick Disconnect Bushing------€228.26
N442B4 3/4"Bushed442B4L, 5L, A, Ax, B, BxSH4"4.4"-€150.91
L441B4 3/4"Bushed441B4L, 5L, A, Ax, B, BxSH4"4.4"-€80.06
H446B4 3/4"Quick Disconnect Bushing------€312.92
I384B4.15"Bushed384B4L, 5L, A, Ax, B, BxSD3.4"3.8"-€186.58
TB WOODS -

Narrow V-Belt Sheaves

StyleModelMaterialBore TypeOutside Dia.Industry NumberFor Belt SectionFor Bushing SizeC Or Cx Belt Pitch Dia.Datum Dia.Price
A5V809Cast IronQuick Disconnect Bushing8"----8"€581.49
B5V37510Cast IronQuick Disconnect Bushing37 1/2"----37 1/2"€3,866.74
C3V655Cast IronQuick Disconnect Bushing6 1/2"----6 1/2"€217.38
C3V565Cast IronQuick Disconnect Bushing5 3/5"----5 3/5"€206.51
D8V3006Cast IronQuick Disconnect Bushing30"----30"€3,383.90
E8V2246Cast IronQuick Disconnect Bushing22 2/5"----22 2/5"€3,278.32
E8V2126Cast IronQuick Disconnect Bushing21 1/5"----21 1/5"€2,773.97
E8V2006Cast IronQuick Disconnect Bushing20"----20"€2,501.28
F8V1806Cast IronQuick Disconnect Bushing-----18"€2,101.49
G8V1706Cast IronQuick Disconnect Bushing17"----17"€1,949.78
F8V1606Cast IronQuick Disconnect Bushing16"----16"€1,758.57
F8V1406Cast IronQuick Disconnect Bushing14"----14"€1,644.20
F8V1326Cast IronQuick Disconnect Bushing13 1/5"----13 1/5"€1,503.11
B5V50010Cast IronQuick Disconnect Bushing50"----50"€5,421.83
B5V28010Cast IronQuick Disconnect Bushing28"----28"€2,689.90
H8V1608Cast IronQuick Disconnect Bushing16"----16"€2,123.03
I5V21210Cast IronQuick Disconnect Bushing21 1/5"----21 1/5"€2,017.42
F8V1506Cast IronQuick Disconnect Bushing15"----15"€1,735.31
I5V16010Cast IronQuick Disconnect Bushing16"----16"€1,664.86
J3V1403Cast IronBushed14"3V14033V, 3VXSK-14"€476.99
K3V1401Cast IronBushed14"3V14013V, 3VXSK-14"€311.11
L5V12510Cast IronQuick Disconnect Bushing12 1/2"----12 1/2"€1,138.73
L5V11810Cast IronQuick Disconnect Bushing11 4/5"----11 4/5"€1,093.17
M3V691Cast IronBushed6.9"3V6913V, 3VXSH-6.9"€163.35
M3V651Cast IronBushed6 1/2"3V6513V, 3VXSH-6 1/2"€130.47
StyleModelMPNPrice
A425X200IDL425X200IDL€417.70
A425X300IDL425X300IDL€555.76
A425X400IDL425X400IDL€535.18
A650X175IDL650X175IDL€738.51
A650X275IDL650X275IDL€792.48
A650X425IDL650X425IDL€995.19
A650X575IDL650X575IDL€1,126.85
A650X750IDL650X750IDL€1,253.22
TB WOODS -

Fixed Bore Cast Iron Variable Pitch V-Belt Pulley, Number of Grooves: 1

StyleModelIndustry NumberOutside Dia.4l, A, Or Ax Belt Pitch Dia.5l, B, Or Bx Belt Pitch Dia.Bore Dia.Keyway SizeFor V-belt Type4la Or A Belt Pitch Dia.Price
A1VP4411VP4414.15"2.97" to 4.15"3.38" to 4.21"1"1/4" x 1/8"Classical, Cogged2.97" to 4.15"€102.36
A1VP5011VP5014 3/4"3.57" to 4.75"3.98" to 4.81"1"1/4" x 1/8"Classical, Cogged3.57" to 4.75"€126.59
A1VP5611VP5615.35"4.17" to 5.35"4.58" to 5.41"1"1/4" x 1/8"Classical, Cogged4.17" to 5.35"€133.13
B1VP6211VP6215.95"4.77" to 5.95"5.21" to 6.01"1"1/4" x 1/8"Classical, Wedge, Cogged4.77" to 5.95"€206.16
B1VP6811VP6816.55"-5.81" to 6.61"1"1/4" x 1/8"Classical, Wedge, Cogged5.37" to 6.55"€200.17
A1VP25121VP25122.58"--1/2"No KeywayClassical, Cogged-€57.16
A1VP25581VP25582.58"--5/8"0.187" x 0.093"Classical, Cogged-€57.16
A1VP30121VP30122.83"--1/2"No KeywayClassical, Cogged-€57.19
A1VP30581VP3058---5/8"0.187" x 0.093"Classical, Cogged-€57.19
A1VP34121VP34123.15"2.41" to 3.13"2.77" to 3.19"1/2"No KeywayClassical, Cogged2.41" to 3.13"€70.06
A1VP34341VP34343.15"2.41" to 3.13"2.77" to 3.19"-0.187" x 0.093"Classical, Cogged2.41" to 3.13"€70.06
A1VP34581VP34583.15"2.41" to 3.13"2.77" to 3.19"5/8"0.187" x 0.093"Classical, Cogged2.41" to 3.13"€70.06
A1VP34781VP3478-2.41" to 3.13"2.77" to 3.19"7/8"0.187" x 0.093"Classical, Cogged2.41" to 3.13"€70.06
A1VP40121VP40123 3/4"2.57" to 3.75"2.98" to 3.81"-No KeywayClassical, Cogged2.57" to 3.75"€73.84
A1VP40341VP40343 3/4"2.57" to 3.75"2.98" to 3.81"3/4"0.187" x 0.093"Classical, Cogged2.57" to 3.75"€73.84
A1VP40581VP40583 3/4"2.57" to 3.75"2.98" to 3.81"5/8"0.187" x 0.093"Classical, Cogged2.57" to 3.75"€73.84
A1VP40781VP40783 3/4"2.57" to 3.75"2.98" to 3.81"7/8"0.187" x 0.093"Classical, Cogged2.57" to 3.75"€73.84
A1VP44121VP44124.15"2.97" to 4.15"3.38" to 4.21"-No KeywayClassical, Cogged2.97" to 4.15"€102.36
A1VP44341VP44344.15"2.97" to 4.15"3.38" to 4.21"3/4"0.187" x 0.093"Classical, Cogged2.97" to 4.15"€102.36
A1VP44581VP44584.15"2.97" to 4.15"3.38" to 4.21"5/8"0.187" x 0.093"Classical, Cogged2.97" to 4.15"€92.11
A1VP44781VP44784.15"2.97" to 4.15"3.38" to 4.21"-0.187" x 0.093"-2.97" to 4.15"€92.11
A1VP50121VP50124 3/4"3.57" to 4.75"3.98" to 4.81"-No KeywayClassical, Cogged3.57" to 4.75"€126.59
A1VP50341VP50344 3/4"3.57" to 4.75"3.98" to 4.81"3/4"0.187" x 0.093"Classical, Cogged3.57" to 4.75"€126.59
A1VP50581VP50584 3/4"3.57" to 4.75"3.98" to 4.81"5/8"0.187" x 0.093"Classical, Cogged3.57" to 4.75"€113.94
A1VP50781VP50784 3/4"3.57" to 4.75"3.98" to 4.81"7/8"0.187" x 0.093"Classical, Cogged3.57" to 4.75"€113.94
TB WOODS -

Fixed Bore Cast Iron Variable Pitch V-Belt Pulley, Number of Grooves: 2

StyleModel4l, A, Or Ax Belt Pitch Dia.Outside Dia.Industry Number5l, B, Or Bx Belt Pitch Dia.Bore Dia.Keyway Size4la Or A Belt Pitch Dia.Fits Shaft Dia.Price
A2VP42782.81" to 3.95"3.95"2VP42783.18" to 4.01"7/8"0.187" x 0.093"2.81" to 3.95"-€181.20
A2VP42582.81" to 3.95"3.95"2VP42583.18" to 4.01"5/8"0.187" x 0.093"2.81" to 3.95"5/8"€181.20
A2VP4212.81" to 3.95"3.95"2VP4213.18" to 4.01"1"1/4" x 1/8"2.81" to 3.95"1"€181.20
A2VP421182.81" to 3.95"3.95"2VP421183.18" to 4.01"-1/4" x 1/8"2.81" to 3.95"1.125"€181.20
A2VP36342.88" to 3.35"3.35"2VP36343.13" to 3.41"3/4"0.187" x 0.093"2.88" to 3.35"3/4"€169.00
A2VP36582.88" to 3.35"3.35"2VP36583.13" to 3.41"5/8"0.187" x 0.093"-5/8"€168.24
A2VP36782.88" to 3.35"3.35"2VP36783.13" to 3.41"7/8"0.187" x 0.093"2.88" to 3.35"-€165.23
A2VP50583.57" to 4.75"4 3/4"2VP50583.98" to 4.81"5/8"0.187" x 0.093"3.57" to 4.75"5/8"€217.51
A2VP5013.57" to 4.75"4 3/4"2VP501-1"1/4" x 1/8"3.57" to 4.75"1"€217.51
A2VP501183.57" to 4.75"4 3/4"2VP501183.98" to 4.81"-1/4" x 1/8"3.57" to 4.75"1.125"€217.51
A2VP50783.57" to 4.75"4 3/4"2VP50783.98" to 4.81"7/8"0.187" x 0.093"3.57" to 4.75"-€217.51
A2VP56784.17" to 5.35"5.35"2VP5678-7/8"0.187" x 0.093"4.17" to 5.35"-€244.12
A2VP5614.17" to 5.35"--4.58" to 5.41"1"1/4" x 1/8"4.17" to 5.35"1"€244.12
A2VP561184.17" to 5.35"5.35"2VP561184.58" to 5.41"1 1/8"1/4" x 1/8"4.17" to 5.35"1.125"€244.12
B2VP651584.75" to 5.98"6 1/2"2VP651585.24" to 6.45"1 5/8"3/8"4.75" to 5.98"1.625"€291.94
B2VP651384.75" to 5.98"6 1/2"2VP651385.24" to 6.45"1 3/8"0.312"4.75" to 5.98"-€291.94
B2VP651184.75" to 5.98"6 1/2"2VP651185.24" to 6.45"1 1/8"1/4" x 1/8"4.75" to 5.98"1.125"€291.94
B2VP621384.77" to 5.95"5.95"2VP621385.21" to 6.01"-0.312"4.77" to 5.95"1.375"€312.37
B2VP621184.77" to 5.95"5.95"2VP621185.21" to 6.01"1 1/8"1/4" x 1/8"4.77" to 5.95"1.125"€312.37
B2VP711385.4" to 6.58"7.1"2VP711385.84" to 7.05"-0.312"5.4" to 6.58"1.375"€321.06
B2VP711185.4" to 6.58"7.1"2VP711185.84" to 7.05"1 1/8"1/4" x 1/8"5.4" to 6.58"1.125"€321.06
B2VP711585.4" to 6.58"7.1"2VP711585.84" to 7.05"1 5/8"3/8"5.4" to 6.58"1.625"€321.06
B2VP751585.8" to 6.98"7 1/2"2VP751586.24" to 7.45"1 5/8"3/8"5.8" to 6.98"1.625"€514.41
B2VP751185.8" to 6.98"7 1/2"2VP751186.24" to 7.45"1 1/8"1/4" x 1/8"5.8" to 6.98"1.125"€514.41
B2VP751385.8" to 6.98"7 1/2"2VP751386.24" to 7.45"-0.312"5.8" to 6.98"1.375"€514.41
TB WOODS -

FHPBoredtosize V-Belt Sheaves

StyleModelBore TypeOutside Dia.Bore Dia.For Belt Section4l, A, Or Ax Belt Pitch Dia.Industry Number5l, B, Or Bx Belt Pitch Dia.Max. RpmPrice
A2AK941--1"----2710 RPM€252.53
BBK95118-9 1/4"-----2710 RPM€174.55
A2AK9434-------2710 RPM€273.30
CBK2658-2 3/4"5/8"----9100 RPM€46.87
DBK721716-6.95"-----3600 RPM€134.41
A2BK801716-7 3/4"1.438"----3230 RPM€267.53
EAK5912-5 3/4"-----4350 RPM€94.19
DAK54118Finished With Keyway5 1/4"-----4770 RPM€82.49
F2BK26118Finished With Keyway2 3/4"-----9100 RPM€107.65
BBK120138Finished With Keyway------2130 RPM€218.96
G2BK62138Finished With Keyway5.95"-----4210 RPM€205.11
H2BK67138Finished With Keyway6.45"-----3880 RPM€227.05
A2BK80138Finished With Keyway7 3/4"1 3/8"----3230 RPM€263.00
CBK2258Finished With Keyway2.35"5/8"----10640 RPM€42.23
CBK221Finished With Keyway2.35"-----10640 RPM€43.02
BAK8134Finished With Keyway7.95"-----3150 RPM€134.95
DBK77138Finished With Keyway7.45"-----3360 RPM€138.25
A2BK1201Finished With Keyway11 3/4"-----2130 RPM€324.33
BAK9134Finished With Keyway8.95"3/4"----2800 RPM€150.25
BAK911Finished With Keyway8.95"-----2800 RPM€150.25
CAK1958Finished With Keyway1.95"-----12830 RPM€30.77
IAK3558Finished With Keyway3.55"-----7050 RPM€59.51
A2BK1101716Finished With Keyway-1.438"----2330 RPM€345.60
BBK95138Finished With Keyway9 1/4"-----2710 RPM€173.75
DBK77118Finished With Keyway7.45"-----3360 RPM€138.25
TB WOODS -

V-Belt Pulleys

StyleModelBore TypeIndustry Number4l, A, Or Ax Belt Pitch Dia.For Belt SectionOutside Dia.For Bushing Size5l, B, Or Bx Belt Pitch Dia.ConstructionPrice
A904BBushed904B8.6"4L, 5L, A, Ax, B, Bx9.35"SK9"Web€360.11
B2342BBushed6301723"4L, 5L, A, Ax, B, Bx-SF23.4"Arm€2,055.30
C902BBushed902B8.6"4L, 5L, A, Ax, B, Bx9.35"SK9"Arm€211.61
D903BBushed903B8.6"4L, 5L, A, Ax, B, Bx9.35"SK9"Arm€274.67
EAK104X7/8Fixed BoreAK1047810"3L, 4L, A, Ax---Arm€155.62
EAK114X7/8Fixed BoreAK1147811"3L, 4L, A, Ax11 1/4"--Arm€205.78
EAK124X7/8Fixed BoreAK1247812"----Arm€155.42
EAK144X7/8Fixed BoreAK1447814"3L, 4L, A, Ax14 1/4"--Arm€211.49
EAK74X7/8Fixed BoreAK74787"3L, 4L, A, Ax7 1/4"--Arm€90.94
EAK84X7/8Fixed BoreAK84788"3L, 4L, A, Ax---Arm€106.14
EAK94X7/8Fixed BoreAK94789"3L, 4L, A, Ax---Arm€116.00
StyleModelMPNPrice
A8838S8838S€1,090.42
A9838S9838S€1,406.31
A10838S10838S€1,547.41
A11838S11838S€1,630.52
A14838S14838S€1,837.64
A16838S16838S€2,268.22
A20838S20838S€2,901.40
A24514S24514S€3,320.05
A24638S24638S€3,386.13
A24838S24838S€3,943.17
A101012S101012S€2,073.80
A111012S111012S€2,180.90
A141012S141012S€2,263.31
A161012S161012S€2,901.40
TB WOODS -

SD STR Pulleys

StyleModelMPNPrice
A4234S4234S€569.40
A4314S4314S€622.69
A4414S4414S€706.21
A5234S5234S€615.89
A5414S5414S€732.58
A6234S6234S€673.99
A6314S6314S€732.58
A6414S6414S€746.20
A7234S7234S€732.58
A7314S7314S€720.47
A7414S7414S€742.46
A8234S8234S€688.02
A8314S8314S€710.22
A8414S8414S€786.13
A9234S9234S€743.50
A9314S9314S€753.38
A9414S9414S€818.89
A10234S10234S€786.13
A10314S10314S€784.70
A10414S10414S€805.08
A11234S11234S€786.10
A11414S11414S€903.51
A12234S12234S€866.22
A12314S12314S€886.60
StyleModelMPNPrice
A62S62S€673.99
A72S72S€732.58
A82S82S€756.98
A92S92S€743.50
A102S102S€754.45
A112S112S€840.75
A122S122S€890.66
A142S142S€1,144.24
A162S162S€1,222.96
A121212S121212S€2,829.14
A161212S161212S€3,836.06
A181012S181012S€3,351.43
A181212S181212S€4,566.28
A201012S201012S€3,943.17
A241012S241012S€4,975.20
A241212S241212S€5,802.78
TB WOODS -

SF STR Pulleys

StyleModelMPNPrice
A6514S6514S€842.25
A7514S7514S€805.08
A8514S8514S€792.17
A8638S8638S€886.60
A9514S9514S€922.21
A9638S9638S€1,111.23
A10514S10514S€977.97
A10638S10638S€1,192.32
A11514S11514S€1,110.79
A11638S11638S€1,306.76
A12414S12414S€903.68
A12514S12514S€1,101.37
A12638S12638S€1,372.05
A14234S14234S€1,192.32
A14314S14314S€1,286.36
A14414S14414S€1,303.12
A14514S14514S€1,481.41
A14638S14638S€1,608.23
A16234S16234S€1,212.98
A16314S16314S€1,333.20
A16414S16414S€1,363.28
A16514S16514S€1,762.25
A16638S16638S€1,726.17
A18234S18234S€1,304.41
A18314S18314S€1,408.86
StyleModelMPNPrice
A6J15016J1501€124.77
A6J150346J15034€129.57
A6J150586J15058€109.64
A6J160126J16012€133.91
A6J160346J16034€134.59
A6J180126J18012€141.89
A6J180346J18034€141.89
A6J180586J18058€120.07
A6J190126J19012€144.04
A6J190346J19034€144.04
A6J190586J19058€134.02
A6J190786J19078€144.04

Features

  • Narrow V-belt sheaves can accommodate narrow profile V-belts to transmit an equivalent load and maximise power transmission efficiency.
  • They are made of cast iron to provide resistance to wear and prevent galling. They feature a 3V / 5V / 8V cross section and five grooves for use with multiple or banded belts.
  • These units are suitable for problem drives that need high-impact strength and load carrying power in applications like farm machinery, HVAC units, home appliances and food processing equipment.
  • Models, such as, classical V-belt sheaves feature a cover fabric that offers superior flexibility and abrasion resistance and have wrapped / cog construction for reduced vibrations and noise during application.

Frequently Asked Questions

What is the difference between a pulley and a sheave?

A pulley is a wheel that carries a flexible rope, cord, cable or chain on its rim and a sheave is a rotating groove inside the pulley where the rope fits.

What is the advantage of a variable pitch pulley?

Variable pitch pulleys allow the technician to increase or decrease drive speed (within seconds) while the machine is in operation. This pulley also maximises the efficiency of the drive system and alters static pressure around the drive.

What is the purpose of a groove in a sheave?

The grooves cradle the rope / chain which allows an increase in the bearing pressure on the rope, thus creating a gripping action and increased traction during the operation.