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.
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
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
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
A15510D-Quick Disconnect Bushing------€4,825.81
B2408C-Quick Disconnect Bushing------€2,143.51
C1608D-Quick Disconnect Bushing------€4,004.40
D2406C-Quick Disconnect Bushing------€1,718.00
E346B-Quick Disconnect Bushing------€278.30
F345B-Quick Disconnect Bushing------€201.09
G567B-Quick Disconnect Bushing------€445.58
H2404D-Quick Disconnect Bushing-------
RFQ
I343B3 3/4"Bushed343B4L, 5L, A, Ax, B, BxSH3"3.4"-€138.31
J341B3 3/4"Bushed341B4L, 5L, A, Ax, B, BxSH3"3.4"-€66.83
K342B3 3/4"Bushed342B4L, 5L, A, Ax, B, BxSH3"3.4"-€119.36
L344B3 3/4"Bushed344B4L, 5L, A, Ax, B, BxSD3"3.4"-€175.91
J361B3.95"Bushed361B4L, 5L, A, Ax, B, BxSH3.2"3.6"-€84.93
K362B3.95"Bushed362B4L, 5L, A, Ax, B, BxSH3.2"3.6"-€125.73
E366B3.95"Quick Disconnect Bushing------€283.84
I363B3.95"Bushed363B4L, 5L, A, Ax, B, BxSH3.2"3.6"-€115.62
F365B3.95"Quick Disconnect Bushing------€212.50
L364B3.95"Quick Disconnect Bushing------€184.54
L444B4 3/4"Bushed444B4L, 5L, A, Ax, B, BxSD4"4.4"-€201.67
F445B4 3/4"Quick Disconnect Bushing------€228.26
E446B4 3/4"Quick Disconnect Bushing------€312.92
M442B4 3/4"Bushed442B4L, 5L, A, Ax, B, BxSH4"4.4"-€150.91
J441B4 3/4"Bushed441B4L, 5L, A, Ax, B, BxSH4"4.4"-€80.06
N443B4 3/4"Bushed443B4L, 5L, A, Ax, B, BxSH4"4.4"-€142.63
I383B4.15"Bushed383B4L, 5L, A, Ax, B, BxSH3.4"3.8"-€141.41
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
A2AK9434-------2710 RPM€273.30
BAK5912-5 3/4"-----4350 RPM€94.19
CBK721716-6.95"-----3600 RPM€134.41
DBK2658-2 3/4"5/8"----9100 RPM€46.87
EBK95118-9 1/4"-----2710 RPM€174.55
A2BK801716-7 3/4"1.438"----3230 RPM€267.53
EBK1901316Finished With Keyway18 3/4"-----1340 RPM€379.41
EBK1301Finished With Keyway-1"----1970 RPM€232.42
EBK1401Finished With Keyway------1820 RPM€251.86
EBK1401316Finished With Keyway------1820 RPM€293.94
EBK1601316Finished With Keyway15 3/4"-----1590 RPM€382.29
F2BK52138Finished With Keyway4.95"-----5060 RPM€171.64
G2BK361Finished With Keyway3 3/4"-----6670 RPM€142.70
F2BK50138Finished With Keyway4 3/4"1 3/8"----5270 RPM€172.41
EBK1101316Finished With Keyway10 3/4"-----2330 RPM€205.02
F2BK55118Finished With Keyway5 1/4"-----4770 RPM€185.28
F2BK57118Finished With Keyway5.45"1 1/8"----4590 RPM€190.58
H2BK701316Finished With Keyway6 3/4"-----3710 RPM€251.97
A2BK801Finished With Keyway7 3/4"1"----3230 RPM€267.53
A2BK801316Finished With Keyway7 3/4"-----3230 RPM€267.53
A2BK1001716Finished With Keyway9 3/4"-----2570 RPM€319.83
EBK1201Finished With Keyway11 3/4"-----2130 RPM€212.79
DBK28118Finished With Keyway2.95"-----8480 RPM€48.80
EBK1051Finished With Keyway10 1/4"1"----2440 RPM€189.70
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
AAK44-4 1/4"----4"5890 RPM€72.18
B2AK94-9 1/4"----9"2710 RPM€245.27
C2AK39------3 1/2"6670 RPM€130.43
C2BK50Bushed4 3/4"4"4L, 5L, A, Ax, B, Bx4.4"2BK504 2/5"5270 RPM€130.05
D2BK70Bushed6 3/4"6"4L, 5L, A, Ax, B, Bx6.4"2BK706 2/5"3710 RPM€178.09
E2BK60Bushed5 3/4"5"4L, 5L, A, Ax, B, Bx5.4"2BK605 2/5"4350 RPM€160.67
B2BK110Bushed10 3/4"10"4L, 5L, A, Ax, B, Bx10.4"2BK11010 2/5"2330 RPM€272.80
FBK57Bushed5.45"4.7"4L, 5L, A, Ax, B, Bx5.1"BK575.1"4590 RPM€78.07
GBK70Bushed6 3/4"6"4L, 5L, A, Ax, B, Bx6.4"BK706 2/5"3710 RPM€88.04
ABK40Bushed3.95"3.2"4L, 5L, A, Ax, B, Bx3.6"BK403 3/5"6330 RPM€70.70
FBK50Bushed4 3/4"4"4L, 5L, A, Ax, B, Bx4.4"BK504 2/5"5270 RPM€73.46
HBK190Bushed18 3/4"18"4L, 5L, A, Ax, B, Bx18.4"BK19018 2/5"1340 RPM€283.81
HBK150Bushed14 3/4"14"4L, 5L, A, Ax, B, Bx14.4"-14 2/5"1700 RPM€230.34
ABK45Bushed4 1/4"3 1/2"4L, 5L, A, Ax, B, Bx3.9"BK453.9"5890 RPM€66.29
FBK65Bushed6 1/4"5 1/2"4L, 5L, A, Ax, B, Bx5.9"BK655.9"4000 RPM€86.39
HBK95Bushed-8 1/2"4L, 5L, A, Ax, B, Bx8.9"BK958.9"2710 RPM€134.85
E2BK55Bushed5 1/4"4 1/2"4L, 5L, A, Ax, B, Bx4.9"2BK554.9"4770 RPM€154.60
B2BK90Bushed8 3/4"8"4L, 5L, A, Ax, B, Bx8.4"2BK908 2/5"2860 RPM€209.94
HBK140Bushed-13"4L, 5L, A, Ax, B, Bx13.4"-13 2/5"1820 RPM€197.81
FBK60Bushed5 3/4"5"4L, 5L, A, Ax, B, Bx5.4"BK605 2/5"4350 RPM€77.25
GAK66Bushed6.45"6.2"3L, 4L, A, Ax-AK666 1/5"3880 RPM€64.04
HBK120Bushed11 3/4"11"4L, 5L, A, Ax, B, Bx11.4"-11 2/5"2130 RPM€170.48
HBK80Bushed7 3/4"7"4L, 5L, A, Ax, B, Bx7.4"BK807 2/5"3230 RPM€101.53
B2BK80Bushed7 3/4"7"4L, 5L, A, Ax, B, Bx7.4"2BK807 2/5"3230 RPM€207.61
B2BK140Bushed13 3/4"13"4L, 5L, A, Ax, B, Bx13.4"2BK14013 2/5"1820 RPM€309.81
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
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
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
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
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
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
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
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
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
A2VP5614.17" to 5.35"--4.58" to 5.41"1"1/4" x 1/8"4.17" to 5.35"1"€244.12
A2VP56784.17" to 5.35"5.35"2VP5678-7/8"0.187" x 0.093"4.17" to 5.35"-€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
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
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
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
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
B2VP711385.4" to 6.58"7.1"2VP711385.84" to 7.05"-0.312"5.4" to 6.58"1.375"€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
B2VP751385.8" to 6.98"7 1/2"2VP751386.24" to 7.45"-0.312"5.8" to 6.98"1.375"€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
TB WOODS -

Narrow V-Belt Sheaves

StyleModelMaterialBore TypeOutside Dia.Industry NumberFor Belt SectionFor Bushing SizeC Or Cx Belt Pitch Dia.Datum Dia.Price
A5V1326Cast IronBushed13 1/5"5V13265V, 5VXF12"13 1/5"€620.61
B5V1508Cast IronQuick Disconnect Bushing15"----15"€1,265.31
C5V11810Cast IronQuick Disconnect Bushing11 4/5"----11 4/5"€1,093.17
D5V10910Cast IronQuick Disconnect Bushing10.9"----10.9"€898.53
D5V10310Cast IronQuick Disconnect Bushing10.3"----10.3"€871.11
D5V97510Cast IronQuick Disconnect Bushing9 3/4"----9 3/4"€813.42
D5V92510Cast IronQuick Disconnect Bushing-----9 1/4"€719.60
D5V9010Cast IronQuick Disconnect Bushing-----9"€715.82
D5V8510Cast IronQuick Disconnect Bushing8 1/2"----8 1/2"€653.23
D5V8010Cast IronQuick Disconnect Bushing8"----8"€605.21
E5V5008Cast IronQuick Disconnect Bushing-----50"€5,127.62
E5V3758Cast IronQuick Disconnect Bushing37 1/2"----37 1/2"€3,740.65
B5V2808Cast IronQuick Disconnect Bushing28"----28"€2,143.51
B5V2128Cast IronQuick Disconnect Bushing21 1/5"----21 1/5"€1,703.60
F5V1408Cast IronQuick Disconnect Bushing14"----14"€1,084.56
C5V13210Cast IronQuick Disconnect Bushing13 1/5"----13 1/5"€1,310.51
F5V1328Cast IronQuick Disconnect Bushing13 1/5"----13 1/5"€994.19
F5V1258Cast IronQuick Disconnect Bushing12 1/2"----12 1/2"€883.20
F5V1188Cast IronQuick Disconnect Bushing11 4/5"----11 4/5"€865.46
G5V1098Cast IronQuick Disconnect Bushing10.9"----10.9"€804.52
G5V1038Cast IronQuick Disconnect Bushing10.3"----10.3"€768.24
G5V9758Cast IronQuick Disconnect Bushing9 3/4"----9 3/4"€723.06
G5V9258Cast IronQuick Disconnect Bushing-----9 1/4"€693.95
G5V858Cast IronQuick Disconnect Bushing8 1/2"----8 1/2"€564.37
H5V2806Cast IronQuick Disconnect Bushing-----28"€1,658.76
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
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

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.