Rating:
M4900DT, M5700, M5700DT, M5700DTN, M6800DT, M6800S, M6800SDT, M7040F, M7040FC, M7580DT, M8200DCN, M8200DTN, M8200SDTN, M8580DT
SPRING
Cross Reference number:
Number on catalog scheme: 140
Compatible models:
Kubota machinery list:
Kubota parts catalog
- D21500 INPUT SHAFT » SPRING,SYNCHRONIZER 33960-34840
- D21500 INPUT SHAFT » SPRING,SYNCHRONIZER 33960-34840
- D21500 INPUT SHAFT » SPRING,SYNCHRONIZER 33960-34840
- D21500 INPUT SHAFT » SPRING,SYNCHRONIZER 33960-34840
- D21500 INPUT SHAFT » SPRING,SYNCHRONIZER 33960-34840
- D21500 INPUT SHAFT » SPRING,SYNCHRONIZER 33960-34840
- D21502 INPUT SHAFT [NEW TYPE] ## S.No.;>=60887 » SPRING,SYNCHRONIZER 33960-34840
- D21502 INPUT SHAFT [NEW TYPE] ## S.No.;C:>=60001 » SPRING,SYNCHRONIZER 33960-34840
- D21502 INPUT SHAFT [NEW TYPE] » SPRING,SYNCHRONIZER 33960-34840
- D21502 INPUT SHAFT [NEW TYPE] » SPRING,SYNCHRONIZER 33960-34840
- D21502 INPUT SHAFT [NEW TYPE] » SPRING,SYNCHRONIZER 33960-34840
- D21501 INPUT SHAFT ## NOTE:ORDER BY REF.No.100 and 150 NEW PARTS. » SPRING,SYNCHRONIZER 33960-34840
- D21501 INPUT SHAFT ## NOTE:ORDER BY REF.No.100 and 150 NEW PARTS. » SPRING,SYNCHRONIZER 33960-34840
- D21502 INPUT SHAFT ## NOTE:ORDER BY REF.No.100 and 150 NEW PARTS. » SPRING,SYNCHRONIZER 33960-34840
- T08003 COUNTERSHAFT (SYNCHRO-SHUTTLE WITH DS/IC SHUTTLE) ## S.No.;>=60219 » SPRING,SYNCHRONIZER 33960-34840
- T08003 COUNTERSHAFT (SYNCHRO-SHUTTLE WITH DS/IC SHUTTLE) ## S.No.;>=60219 » SPRING,SYNCHRONIZER 33960-34840
- T08003 COUNTERSHAFT (SYNCHRO-SHUTTLE WITH DS/IC SHUTTLE) ## S.No.:>=60219 » SPRING,SYNCHRONIZER 33960-34840
- D21500 INPUT SHAFT » SPRING,SYNCHRONIZER 33960-34840
- D21502 INPUT SHAFT [NEW TYPE] ## S.No.;A:>=51733 » SPRING,SYNCHRONIZER 33960-34840
- D21502 INPUT SHAFT [NEW TYPE] » SPRING,SYNCHRONIZER 33960-34840
- T08003 COUNTERSHAFT (SYNCHRO-SHUTTLE WITH DS/IC SHUTTLE) ## S.No.;>=60281 » SPRING,SYNCHRONIZER 33960-34840
- D21500 INPUT SHAFT » SPRING SYNCHRONIZER 3396034840
- D21500 INPUT SHAFT » SPRING SYNCHRONIZER 3396034840
- D21500 INPUT SHAFT » SPRING SYNCHRONIZER 3396034840
- D21500 INPUT SHAFT » SPRING SYNCHRONIZER 3396034840
- D21501 INPUT SHAFT ## NOTE:ORDER BY REF.No.100 and 150 NEW PARTS. » SPRING,SYNCHRONIZER 3396034840
- D21501 INPUT SHAFT ## NOTE:ORDER BY REF.No.100 and 150 NEW PARTS. » SPRING,SYNCHRONIZER 3396034840
- D21501 INPUT SHAFT ## NOTE:ORDER BY REF.No.150 and 100 NEW PARTS. » SPRING,SYNCHRONIZER 3396034840
- D21501 INPUT SHAFT ## NOTE:ORDER BY REF.No.150 and 100 NEW PARTS. » SPRING,SYNCHRONIZER 3396034840
- D21501 INPUT SHAFT ## NOTE:ORDER BY REF.No.100 and 150 NEW PARTS. » SPRING,SYNCHRONIZER 3396034840
- D21501 INPUT SHAFT ## NOTE:ORDER BY REF.No.100 and 150 NEW PARTS. » SPRING,SYNCHRONIZER 3396034840
- D21501 INPUT SHAFT ## NOTE:ORDER BY REF.No.150 and 100 NEW PARTS. » SPRING,SYNCHRONIZER 3396034840
- D21501 INPUT SHAFT ## NOTE:ORDER BY REF.No.150 and 100 NEW PARTS. » SPRING,SYNCHRONIZER 3396034840
- D21501 INPUT SHAFT » SPRING,SYNCHRONIZER 3396034840
- D21501 INPUT SHAFT » SPRING,SYNCHRONIZER 3396034840
- D21501 INPUT SHAFT » SPRING,SYNCHRONIZER 3396034840
- D21501 INPUT SHAFT » SPRING,SYNCHRONIZER 3396034840
- D21500 INPUT SHAFT » SPRING SYNCHRONIZER 3396034840
- D21500 INPUT SHAFT » SPRING SYNCHRONIZER 3396034840
- D21500 INPUT SHAFT » SPRING SYNCHRONIZER 3396034840
- D21500 INPUT SHAFT » SPRING SYNCHRONIZER 3396034840
- D21500 INPUT SHAFT » SPRING SYNCHRONIZER 3396034840
- D21501 INPUT SHAFT ## NOTE:ORDER BY REF.No.100 and 150 NEW PARTS. » SPRING,SYNCHRONIZER 3396034840
- D21501 INPUT SHAFT ## NOTE:ORDER BY REF.No.100 and 150 NEW PARTS. » SPRING,SYNCHRONIZER 3396034840
- D21501 INPUT SHAFT ## NOTE:ORDER BY REF.No.100 and 150 NEW PARTS. » SPRING,SYNCHRONIZER 3396034840
- D21501 INPUT SHAFT ## NOTE:ORDER BY REF.No.100 and 150 NEW PARTS. » SPRING,SYNCHRONIZER 3396034840
- D21501 INPUT SHAFT ## NOTE:ORDER BY REF.No.100 and 150 NEW PARTS. » SPRING,SYNCHRONIZER 3396034840
- D21501 INPUT SHAFT ## NOTE:ORDER BY REF.No.100 and 150 NEW PARTS. » SPRING,SYNCHRONIZER 3396034840
- D21501 INPUT SHAFT ## NOTE:ORDER BY REF.No.100 and 150 NEW PARTS. » SPRING,SYNCHRONIZER 3396034840
- D21501 INPUT SHAFT ## NOTE:ORDER BY REF.No.100 and 150 NEW PARTS. » SPRING,SYNCHRONIZER 3396034840
- D21502 INPUT SHAFT [NEW TYPE] ## S.No.>=20001 S.No.;A:>=20001 » SPRING,SYNCHRONIZER 3396034840
- D21502 INPUT SHAFT [NEW TYPE] ## S.No.>=60001 S.No.;C:>=60001 » SPRING,SYNCHRONIZER 3396034840
- D21502 INPUT SHAFT [NEW TYPE] » SPRING,SYNCHRONIZER 3396034840
- D21502 INPUT SHAFT [NEW TYPE] » SPRING,SYNCHRONIZER 3396034840
- D21502 INPUT SHAFT ## NOTE:ORDER BY REF.No.100 and 150 NEW PARTS. » SPRING,SYNCHRONIZER 3396034840
- D21502 INPUT SHAFT ## NOTE:ORDER BY REF.No.100 and 150 NEW PARTS. » SPRING,SYNCHRONIZER 3396034840
- D21502 INPUT SHAFT ## NOTE:ORDER BY REF.No.100 and 150 NEW PARTS. » SPRING,SYNCHRONIZER 3396034840
- D21502 INPUT SHAFT ## NOTE:ORDER BY REF.No.100 and 150 NEW PARTS. » SPRING,SYNCHRONIZER 3396034840
- D21501 INPUT SHAFT ## NOTE:ORDER BY REF.No.100 and 150 NEW PARTS. » SPRING,SYNCHRONIZER 3396034840
- D21501 INPUT SHAFT ## NOTE:ORDER BY REF.No.100 and 150 NEW PARTS. » SPRING,SYNCHRONIZER 3396034840
- D21501 INPUT SHAFT ## NOTE:ORDER BY REF.No.100 and 150 NEW PARTS. » SPRING,SYNCHRONIZER 3396034840
- D21501 INPUT SHAFT ## NOTE:ORDER BY REF.No.100 and 150 NEW PARTS. » SPRING,SYNCHRONIZER 3396034840
- T08003 COUNTERSHAFT (SYNCHRO-SHUTTLE WITH DS/IC SHUTTLE) ## S.No.;>=60219 » SPRING 3396034840
- T08003 COUNTERSHAFT (SYNCHRO-SHUTTLE WITH DS/IC SHUTTLE) ## S.No.;>=60219 » SPRING 3396034840
- D21502 INPUT SHAFT [NEW TYPE] ## S.No.;A:>=51733 » SPRING,SYNCHRONIZER 3396034840
- D21502 INPUT SHAFT [NEW TYPE] » SPRING,SYNCHRONIZER 3396034840
- D21201 INPUT SHAFT ## NOTE:ORDER BY REF.No.080 and 130 NEW PARTS. » SPRING,SYNCHRONIZER 3396034840
- D21201 INPUT SHAFT ## NOTE:ORDER BY REF.No.080 and 130 NEW PARTS. » SPRING,SYNCHRONIZER 3396034840
- D21201 INPUT SHAFT ## NOTE:ORDER BY REF.No.080 and 130 NEW PARTS. » SPRING,SYNCHRONIZER 3396034840
- D21201 INPUT SHAFT ## NOTE:ORDER BY REF.No.080 and 130 NEW PARTS. » SPRING,SYNCHRONIZER 3396034840
- D21201 INPUT SHAFT ## NOTE:ORDER BY REF.No.080 and 130 NEW PARTS. » SPRING,SYNCHRONIZER 3396034840
- D21201 INPUT SHAFT ## NOTE:ORDER BY REF.No.080 and 130 NEW PARTS. » SPRING,SYNCHRONIZER 3396034840
- D21201 INPUT SHAFT ## NOTE:ORDER BY REF.No.080 and 130 NEW PARTS. » SPRING,SYNCHRONIZER 3396034840
- D21201 INPUT SHAFT ## NOTE:ORDER BY REF.No.080 and 130 NEW PARTS. » SPRING,SYNCHRONIZER 3396034840
- T08003 COUNTERSHAFT (SYNCHRO-SHUTTLE WITH DS/IC SHUTTLE) ## S.No.;>=60281 » SPRING 3396034840
- D21201 INPUT SHAFT ## NOTE:ORDER BY REF.No.080 and 130 NEW PARTS. » SPRING,SYNCHRONIZER 3396034840
- D21201 INPUT SHAFT ## NOTE:ORDER BY REF.No.080 and 130 NEW PARTS. » SPRING,SYNCHRONIZER 3396034840
- D21201 INPUT SHAFT ## NOTE:ORDER BY REF.No.080 and 130 NEW PARTS. » SPRING,SYNCHRONIZER 3396034840
- D21201 INPUT SHAFT ## NOTE:ORDER BY REF.No.080 and 130 NEW PARTS. » SPRING,SYNCHRONIZER 3396034840
- D21201 INPUT SHAFT ## NOTE:ORDER BY REF.No.080 and 130 NEW PARTS. » SPRING,SYNCHRONIZER 3396034840
- D21201 INPUT SHAFT ## NOTE:ORDER BY REF.No.080 and 130 NEW PARTS. » SPRING,SYNCHRONIZER 3396034840
- D21201 INPUT SHAFT ## NOTE:ORDER BY REF.No.080 and 130 NEW PARTS. » SPRING,SYNCHRONIZER 3396034840
- D21201 INPUT SHAFT ## NOTE:ORDER BY REF.No.080 and 130 NEW PARTS. » SPRING,SYNCHRONIZER 3396034840
Parts spring Kubota :
19077-56412
SPRING
KX121, KX161, L2600DT, L2600F, L2900DT, L3000DT, L3000F, L3010DT, L3010F, L3300DT, L3410DT, L35, L3600DT, L3710DT, L4200DT, L4200F, L4300DT, L4300F, L4310DT, L4310F, L4610DT, M4700, M4700DT, M4900DT, ...
KX121, KX161, L2600DT, L2600F, L2900DT, L3000DT, L3000F, L3010DT, L3010F, L3300DT, L3410DT, L35, L3600DT, L3710DT, L4200DT, L4200F, L4300DT, L4300F, L4310DT, L4310F, L4610DT, M4700, M4700DT, M4900DT, ...
1G774-54262
SPRING
M6040DH, M6040DHC, M7040DH, M7040DHC, M7040FC, M7040SUD, M7040SUHD
M6040DH, M6040DHC, M7040DH, M7040DHC, M7040FC, M7040SUD, M7040SUHD
31391-47140
SPRING
B2630HSD, B3000HSDCC, B3030HSD, B3030HSDC, L3130DT, L3130HST, L3430DT, L3430HST, L3830DT, L4330DT, L4330HST(C), L4630DT, L4630HST, L5030HST(C), M6040DH, M7040DH, M7040F, M7040SUD, M7040SUHD, M8540DH, ...
B2630HSD, B3000HSDCC, B3030HSD, B3030HSDC, L3130DT, L3130HST, L3430DT, L3430HST, L3830DT, L4330DT, L4330HST(C), L4630DT, L4630HST, L5030HST(C), M6040DH, M7040DH, M7040F, M7040SUD, M7040SUHD, M8540DH, ...
33300-10410
SPRING LEVER RETURN
M5500, M5500DT, M5950, M5950DT, M5970DT, M5970DT(BI, M6030, M6030DT, M6950, M6950DT, M6970DT, M6970DT(BI, M7030, M7030DT, M7500, M7500DT, M7580DT, M7950, M7950DT, M7970DT, M7970DT(BI, M8030, M8030DT, ...
M5500, M5500DT, M5950, M5950DT, M5970DT, M5970DT(BI, M6030, M6030DT, M6950, M6950DT, M6970DT, M6970DT(BI, M7030, M7030DT, M7500, M7500DT, M7580DT, M7950, M7950DT, M7970DT, M7970DT(BI, M8030, M8030DT, ...
33860-64510
SPRING CONTROL
M7580DT, M8580DT, M9580DT
M7580DT, M8580DT, M9580DT
33980-26160
SPRING
M100XDC, M105SDT, M105SHD, M105XDT, M108SDC, M108SDSL, M108SDTLDS, M110XDC, M125XDT, M126XDC, M126XDTPC, M135XDC, M135XDCS, M4900DT, M5700DH, M5700DHC, M5700DT, M6040DH, M6040DHC, M6800DH, M6800DHC, M...
M100XDC, M105SDT, M105SHD, M105XDT, M108SDC, M108SDSL, M108SDTLDS, M110XDC, M125XDT, M126XDC, M126XDTPC, M135XDC, M135XDCS, M4900DT, M5700DH, M5700DHC, M5700DT, M6040DH, M6040DHC, M6800DH, M6800DHC, M...
36530-11030
SPRING
M100XDC, M105SDT, M105SHD, M105XDT, M108SDC, M108SDSL, M108SDTLDS, M110XDC, M125XDT, M126XDC, M126XDTPC, M135XDC, M135XDCS, M5970DT, M6950, M6950DT, M6970DT, M6970DT(BI, M7580DT, M7950, M7950DT, M7970...
M100XDC, M105SDT, M105SHD, M105XDT, M108SDC, M108SDSL, M108SDTLDS, M110XDC, M125XDT, M126XDC, M126XDTPC, M135XDC, M135XDCS, M5970DT, M6950, M6950DT, M6970DT, M6970DT(BI, M7580DT, M7950, M7950DT, M7970...
3A011-26160
SPRING
M4700, M4700DT, M4900DT, M5400, M5400DT, M5700, M5700DH, M5700DT, M5700DTN, M6800DH, M6800DT, M8200DCN, M8200DH, M8200DT, M8200DTN, M8200SDTN, M9000DT, M9000DTM
M4700, M4700DT, M4900DT, M5400, M5400DT, M5700, M5700DH, M5700DT, M5700DTN, M6800DH, M6800DT, M8200DCN, M8200DH, M8200DT, M8200DTN, M8200SDTN, M9000DT, M9000DTM
3A151-83330
SPRING,TORS.
M8200DCN, M8200DH, M8200DHC, M8200DT, M8200DTN, M8200SDTN, M9000DT, M9000DTM, M9000DTMC, ME8200DH, ME8200DHC, ME9000DH, ME9000DHC
M8200DCN, M8200DH, M8200DHC, M8200DT, M8200DTN, M8200SDTN, M9000DT, M9000DTM, M9000DTMC, ME8200DH, ME8200DHC, ME9000DH, ME9000DHC
3F740-06060
SPRING
M100XDC, M105SDT, M105SHD, M105XDT, M108SDC, M108SDSL, M110XDC, M125XDT, M126XDC, M126XDTPC, M135XDC, M135XDCS, M4700, M4700DT, M4900DT, M5400, M5400DT, M5700, M5700DH, M5700DHC, M5700DT, M5700DTN, M6...
M100XDC, M105SDT, M105SHD, M105XDT, M108SDC, M108SDSL, M110XDC, M125XDT, M126XDC, M126XDTPC, M135XDC, M135XDCS, M4700, M4700DT, M4900DT, M5400, M5400DT, M5700, M5700DH, M5700DHC, M5700DT, M5700DTN, M6...
3F740-06490
SPRING
M105SDT, M105SHD, M108SDSL, M4700, M4700DT, M5400, M5400DT, M6040DH, M6040DHC, M7040DH, M7040DHC, M7040F, M7040FC, M8540DH, M8540DHC, M9540DH, M9540DHC, M95SDT
M105SDT, M105SHD, M108SDSL, M4700, M4700DT, M5400, M5400DT, M6040DH, M6040DHC, M7040DH, M7040DHC, M7040F, M7040FC, M8540DH, M8540DHC, M9540DH, M9540DHC, M95SDT
55311-46230
SPRING
M105SDT, M105SHD, M108SDC, M108SDSL, M108SDTLDS, M6800DH, M6800DHC, M6800DT, M6800SDT, M8200DH, M8200DHC, M8200DT, M9000DT, M9000DTM, M9000DTMC, M95SDT, ME8200DH, ME8200DHC, ME9000DH, ME9000DHC, RTV, ...
M105SDT, M105SHD, M108SDC, M108SDSL, M108SDTLDS, M6800DH, M6800DHC, M6800DT, M6800SDT, M8200DH, M8200DHC, M8200DT, M9000DT, M9000DTM, M9000DTMC, M95SDT, ME8200DH, ME8200DHC, ME9000DH, ME9000DHC, RTV, ...
33870-64540
SPRING
M100XDC, M105SDT, M105SHD, M105XDT, M108SDC, M108SDSL, M110XDC, M8580DT, M9580DT, M95SDT, M95XDT
M100XDC, M105SDT, M105SHD, M105XDT, M108SDC, M108SDSL, M110XDC, M8580DT, M9580DT, M95SDT, M95XDT
33860-64510
SPRING CONTROL
M7580DT, M8580DT, M9580DT
M7580DT, M8580DT, M9580DT
33860-33070
SPRING
M9580DT
M9580DT
33750-43850
SPRING,PLATE
M125XDT, M126GXDTC, M126XDC, M126XDTPC, M135GXDTC, M135GXDTSC, M135XDC, M135XDCS, M7030DT, M7580DT, M8030DT, M8580DT, M9000DTM, M9000DTMC, M9580DT
M125XDT, M126GXDTC, M126XDC, M126XDTPC, M135GXDTC, M135GXDTSC, M135XDC, M135XDCS, M7030DT, M7580DT, M8030DT, M8580DT, M9000DTM, M9000DTMC, M9580DT
33750-42540
SPRING
M7030DT, M7580DT, M8030DT, M8580DT, M9580DT
M7030DT, M7580DT, M8030DT, M8580DT, M9580DT
33740-91140
SPRING,LOCK
M7040SUD, M7040SUHD
M7040SUD, M7040SUHD
33740-33070
SPRING
M7580DT, M8580DT
M7580DT, M8580DT
33740-32930
SPRING,SHIFT FORK
M105SDT, M105SHD, M108SDC, M108SDSL, M108SDTLDS, M7580DT, M8580DT, M9580DT, M95SDT
M105SDT, M105SHD, M108SDC, M108SDSL, M108SDTLDS, M7580DT, M8580DT, M9580DT, M95SDT
33740-32920
SPRING
M105SDT, M105SHD, M108SDC, M108SDSL, M108SDTLDS, M7580DT, M8580DT, M9580DT, M95SDT
M105SDT, M105SHD, M108SDC, M108SDSL, M108SDTLDS, M7580DT, M8580DT, M9580DT, M95SDT
33740-29780
SPRING
M7580DT, M8580DT, M9580DT
M7580DT, M8580DT, M9580DT
33740-29580
SPRING
M7580DT, M8580DT, M9580DT
M7580DT, M8580DT, M9580DT
33740-29040
SPRING
M7580DT, M8580DT, M9580DT
M7580DT, M8580DT, M9580DT
33960-84240
SPRING
M7580DT, M8580DT, M9580DT
M7580DT, M8580DT, M9580DT
33960-84320
SPRING
M7580DT, M8580DT, M9580DT
M7580DT, M8580DT, M9580DT
33960-84322
SPRING
M7580DT, M8580DT, M9580DT
M7580DT, M8580DT, M9580DT
33960-84370
SPRING
M7580DT, M8580DT, M9580DT
M7580DT, M8580DT, M9580DT
33960-84372
SPRING
M7580DT, M8580DT, M9580DT
M7580DT, M8580DT, M9580DT
33960-84650
SPRING
M7580DT, M8580DT, M9580DT
M7580DT, M8580DT, M9580DT
33970-84240
SPRING
M7580DT, M8580DT, M9580DT
M7580DT, M8580DT, M9580DT
33980-26160
SPRING
M100XDC, M105SDT, M105SHD, M105XDT, M108SDC, M108SDSL, M108SDTLDS, M110XDC, M125XDT, M126XDC, M126XDTPC, M135XDC, M135XDCS, M4900DT, M5700DH, M5700DHC, M5700DT, M6040DH, M6040DHC, M6800DH, M6800DHC, M...
M100XDC, M105SDT, M105SHD, M105XDT, M108SDC, M108SDSL, M108SDTLDS, M110XDC, M125XDT, M126XDC, M126XDTPC, M135XDC, M135XDCS, M4900DT, M5700DH, M5700DHC, M5700DT, M6040DH, M6040DHC, M6800DH, M6800DHC, M...
34070-15160
SPRING
L35, M4700DT, M4900DT, M5400DT, M5700DH, M5700DHC, M5700DT, M5700DTN, M6800DH, M6800DHC, M6800DT, M6800SDT, M7040SUD, M7040SUHD
L35, M4700DT, M4900DT, M5400DT, M5700DH, M5700DHC, M5700DT, M5700DTN, M6800DH, M6800DHC, M6800DT, M6800SDT, M7040SUD, M7040SUHD
34070-44160
SPRING
L3130DT, L3130HST, L3240DT, L3240HST, L3430DT, L3430HST, L3540HST, L3830DT, L4240HST, L4240HSTC, L4330DT, L4330HST(C), L4630DT, L4630HST, L5030HST(C), L5240HST, L5240HSTC, L5740HST, L5740HSTC, M105SDT...
L3130DT, L3130HST, L3240DT, L3240HST, L3430DT, L3430HST, L3540HST, L3830DT, L4240HST, L4240HSTC, L4330DT, L4330HST(C), L4630DT, L4630HST, L5030HST(C), L5240HST, L5240HSTC, L5740HST, L5740HSTC, M105SDT...
34070-44170
SPRING
L2900DT, L3010DT, L3010F, L3130DT, L3130HST, L3240DT, L3240HST, L3300DT, L3410DT, L3430DT, L3430HST, L35, L3540HST, L3600DT, L3710DT, L3830DT, L4200DT, L4200F, L4240HST, L4240HSTC, L4310DT, L4310F, L4...
L2900DT, L3010DT, L3010F, L3130DT, L3130HST, L3240DT, L3240HST, L3300DT, L3410DT, L3430DT, L3430HST, L35, L3540HST, L3600DT, L3710DT, L3830DT, L4200DT, L4200F, L4240HST, L4240HSTC, L4310DT, L4310F, L4...
34070-87470
SPRING
L3600DT, L4200DT, L4200F
L3600DT, L4200DT, L4200F