Sponsored products related to 3,175 mm x 9,525 mm x 3,967 mm NMB RF-2 deep groove ball bearings | |||||||||
---|---|---|---|---|---|---|---|---|---|
No. | Brand | d | D | B | C | L | C1 | D1 | L1 |
RF-2 | NMB | 3,175 mm | 9,525 mm | 3,967 mm | 0,641 kN | 0,301 mm | 0,76 mm | 11,18 mm | 0,2 mm |
RF-2210X2HH | NMB | 10 mm | 22 mm | 6 mm | 2,697 kN | 19,08 mm | 1,5 mm | 25 mm | 12,4 mm |
RF-2270 | NMB | 7 mm | 22 mm | 7 mm | 3,297 kN | 19,07 mm | 1,5 mm | 25 mm | 10,8 mm |
RF-2270HH | NMB | 7 mm | 22 mm | 7 mm | 3,297 kN | 19,07 mm | 1,5 mm | 25 mm | 10,8 mm |
RF-2280 | NMB | 8 mm | 22 mm | 7 mm | 3,297 kN | 18,89 mm | 1,5 mm | 25 mm | 10,8 mm |
RF-2280HH | NMB | 8 mm | 22 mm | 7 mm | 3,297 kN | 19,07 mm | 1,5 mm | 25 mm | 10,8 mm |
RF-2ZZ | NMB | 3,175 mm | 9,525 mm | 3,967 mm | 0,641 kN | 0,322 mm | 0,76 mm | 11,18 mm | 0,2 mm |
RF-20-PP | INA | - | - | - | - | - | - | - | - |
RF-22-PP | INA | - | - | - | - | - | - | - | - |
RF-26 | INA | - | - | - | - | - | - | - | - |
RF-26-PP | INA | - | - | - | - | - | - | - | - |
6,35 mm x 15,875 mm x 4,978 mm NMB RF-4HH deep groove ball bearings | Series:HM237500; Cone Part Number:HM237532; Cup Part Number:HM237511; Design Units:Imperial; Bearing Weight:17.50 Kg; Cage Type:Stamped Steel; d:160.325 mm; D:288.925 mm; B - Cone Width:63.5 mm; C - Cup Width:47.625 mm; B:63.505 mm; R - Cone Backface To Clear Radius1:7.110 mm; r - Cup Backface To Clear Radius2:3.30 mm; da - Cone Frontface Backing Diameter:181.10 mm; db - Cone Backface Backing Diameter:192.02 mm; Da - Cup Frontface Backing Diameter:271.30 mm; Db - Cup Backface Backing Diameter:265.94 mm; Ab - Cage-Cone Frontface Clearance:5.1 mm; Aa - Cage-Cone Backface Clearance:5.1 mm; a - Effective Center Location3:-11.7 mm; C90 - Dynamic Radial Rating (90 million revolutions)4:56900 lbf; C1 - Dynamic Radial Rating (1 million revolutions)5:219000 lbf; C0 - Static Radial Rating:278000 lbf; Ca90 - Dynamic Thrust Rating (90 million revolutions)6:31100 lbf; K - Factor7:1.83; e - ISO Factor8:0.32; Y - ISO Factor9:1.88; G1 - Heat Generation Factor (Roller-Raceway):751.2; G2 - Heat Generation Factor (Rib-Roller End):101.5; Cg - Geometry Factor:0.117; |
8 mm x 16 mm x 5 mm NMB LF-1680DD deep groove ball bearings | Series:HM237500; Cone Part Number:HM237532; Cup Part Number:HM237511; Design Units:Imperial; Bearing Weight:17.50 Kg; Cage Type:Stamped Steel; d:160.325 mm; D:288.925 mm; B - Cone Width:63.5 mm; C - Cup Width:47.625 mm; B:63.505 mm; R - Cone Backface To Clear Radius1:7.110 mm; r - Cup Backface To Clear Radius2:3.30 mm; da - Cone Frontface Backing Diameter:181.10 mm; db - Cone Backface Backing Diameter:192.02 mm; Da - Cup Frontface Backing Diameter:271.30 mm; Db - Cup Backface Backing Diameter:265.94 mm; Ab - Cage-Cone Frontface Clearance:5.1 mm; Aa - Cage-Cone Backface Clearance:5.1 mm; a - Effective Center Location3:-11.7 mm; C90 - Dynamic Radial Rating (90 million revolutions)4:56900 lbf; C1 - Dynamic Radial Rating (1 million revolutions)5:219000 lbf; C0 - Static Radial Rating:278000 lbf; Ca90 - Dynamic Thrust Rating (90 million revolutions)6:31100 lbf; K - Factor7:1.83; e - ISO Factor8:0.32; Y - ISO Factor9:1.88; G1 - Heat Generation Factor (Roller-Raceway):751.2; G2 - Heat Generation Factor (Rib-Roller End):101.5; Cg - Geometry Factor:0.117; |
22 mm x 52 mm x 22 mm NMB HR22 plain bearings | Series:HM237500; Cone Part Number:HM237532; Cup Part Number:HM237511; Design Units:Imperial; Bearing Weight:17.50 Kg; Cage Type:Stamped Steel; d:160.325 mm; D:288.925 mm; B - Cone Width:63.5 mm; C - Cup Width:47.625 mm; B:63.505 mm; R - Cone Backface To Clear Radius1:7.110 mm; r - Cup Backface To Clear Radius2:3.30 mm; da - Cone Frontface Backing Diameter:181.10 mm; db - Cone Backface Backing Diameter:192.02 mm; Da - Cup Frontface Backing Diameter:271.30 mm; Db - Cup Backface Backing Diameter:265.94 mm; Ab - Cage-Cone Frontface Clearance:5.1 mm; Aa - Cage-Cone Backface Clearance:5.1 mm; a - Effective Center Location3:-11.7 mm; C90 - Dynamic Radial Rating (90 million revolutions)4:56900 lbf; C1 - Dynamic Radial Rating (1 million revolutions)5:219000 lbf; C0 - Static Radial Rating:278000 lbf; Ca90 - Dynamic Thrust Rating (90 million revolutions)6:31100 lbf; K - Factor7:1.83; e - ISO Factor8:0.32; Y - ISO Factor9:1.88; G1 - Heat Generation Factor (Roller-Raceway):751.2; G2 - Heat Generation Factor (Rib-Roller End):101.5; Cg - Geometry Factor:0.117; |
3 mm x 6 mm x 2 mm NMB LF-630 deep groove ball bearings | Series:HM237500; Cone Part Number:HM237532; Cup Part Number:HM237511; Design Units:Imperial; Bearing Weight:17.50 Kg; Cage Type:Stamped Steel; d:160.325 mm; D:288.925 mm; B - Cone Width:63.5 mm; C - Cup Width:47.625 mm; B:63.505 mm; R - Cone Backface To Clear Radius1:7.110 mm; r - Cup Backface To Clear Radius2:3.30 mm; da - Cone Frontface Backing Diameter:181.10 mm; db - Cone Backface Backing Diameter:192.02 mm; Da - Cup Frontface Backing Diameter:271.30 mm; Db - Cup Backface Backing Diameter:265.94 mm; Ab - Cage-Cone Frontface Clearance:5.1 mm; Aa - Cage-Cone Backface Clearance:5.1 mm; a - Effective Center Location3:-11.7 mm; C90 - Dynamic Radial Rating (90 million revolutions)4:56900 lbf; C1 - Dynamic Radial Rating (1 million revolutions)5:219000 lbf; C0 - Static Radial Rating:278000 lbf; Ca90 - Dynamic Thrust Rating (90 million revolutions)6:31100 lbf; K - Factor7:1.83; e - ISO Factor8:0.32; Y - ISO Factor9:1.88; G1 - Heat Generation Factor (Roller-Raceway):751.2; G2 - Heat Generation Factor (Rib-Roller End):101.5; Cg - Geometry Factor:0.117; |
6 mm x 19 mm x 6 mm NMB 626SS deep groove ball bearings | Series:HM237500; Cone Part Number:HM237532; Cup Part Number:HM237511; Design Units:Imperial; Bearing Weight:17.50 Kg; Cage Type:Stamped Steel; d:160.325 mm; D:288.925 mm; B - Cone Width:63.5 mm; C - Cup Width:47.625 mm; B:63.505 mm; R - Cone Backface To Clear Radius1:7.110 mm; r - Cup Backface To Clear Radius2:3.30 mm; da - Cone Frontface Backing Diameter:181.10 mm; db - Cone Backface Backing Diameter:192.02 mm; Da - Cup Frontface Backing Diameter:271.30 mm; Db - Cup Backface Backing Diameter:265.94 mm; Ab - Cage-Cone Frontface Clearance:5.1 mm; Aa - Cage-Cone Backface Clearance:5.1 mm; a - Effective Center Location3:-11.7 mm; C90 - Dynamic Radial Rating (90 million revolutions)4:56900 lbf; C1 - Dynamic Radial Rating (1 million revolutions)5:219000 lbf; C0 - Static Radial Rating:278000 lbf; Ca90 - Dynamic Thrust Rating (90 million revolutions)6:31100 lbf; K - Factor7:1.83; e - ISO Factor8:0.32; Y - ISO Factor9:1.88; G1 - Heat Generation Factor (Roller-Raceway):751.2; G2 - Heat Generation Factor (Rib-Roller End):101.5; Cg - Geometry Factor:0.117; |
10 mm x 19 mm x 5 mm NMB L-1910 deep groove ball bearings | Series:HM237500; Cone Part Number:HM237532; Cup Part Number:HM237511; Design Units:Imperial; Bearing Weight:17.50 Kg; Cage Type:Stamped Steel; d:160.325 mm; D:288.925 mm; B - Cone Width:63.5 mm; C - Cup Width:47.625 mm; B:63.505 mm; R - Cone Backface To Clear Radius1:7.110 mm; r - Cup Backface To Clear Radius2:3.30 mm; da - Cone Frontface Backing Diameter:181.10 mm; db - Cone Backface Backing Diameter:192.02 mm; Da - Cup Frontface Backing Diameter:271.30 mm; Db - Cup Backface Backing Diameter:265.94 mm; Ab - Cage-Cone Frontface Clearance:5.1 mm; Aa - Cage-Cone Backface Clearance:5.1 mm; a - Effective Center Location3:-11.7 mm; C90 - Dynamic Radial Rating (90 million revolutions)4:56900 lbf; C1 - Dynamic Radial Rating (1 million revolutions)5:219000 lbf; C0 - Static Radial Rating:278000 lbf; Ca90 - Dynamic Thrust Rating (90 million revolutions)6:31100 lbf; K - Factor7:1.83; e - ISO Factor8:0.32; Y - ISO Factor9:1.88; G1 - Heat Generation Factor (Roller-Raceway):751.2; G2 - Heat Generation Factor (Rib-Roller End):101.5; Cg - Geometry Factor:0.117; |
4 mm x 9 mm x 2,5 mm NMB LF-940 deep groove ball bearings | Series:HM237500; Cone Part Number:HM237532; Cup Part Number:HM237511; Design Units:Imperial; Bearing Weight:17.50 Kg; Cage Type:Stamped Steel; d:160.325 mm; D:288.925 mm; B - Cone Width:63.5 mm; C - Cup Width:47.625 mm; B:63.505 mm; R - Cone Backface To Clear Radius1:7.110 mm; r - Cup Backface To Clear Radius2:3.30 mm; da - Cone Frontface Backing Diameter:181.10 mm; db - Cone Backface Backing Diameter:192.02 mm; Da - Cup Frontface Backing Diameter:271.30 mm; Db - Cup Backface Backing Diameter:265.94 mm; Ab - Cage-Cone Frontface Clearance:5.1 mm; Aa - Cage-Cone Backface Clearance:5.1 mm; a - Effective Center Location3:-11.7 mm; C90 - Dynamic Radial Rating (90 million revolutions)4:56900 lbf; C1 - Dynamic Radial Rating (1 million revolutions)5:219000 lbf; C0 - Static Radial Rating:278000 lbf; Ca90 - Dynamic Thrust Rating (90 million revolutions)6:31100 lbf; K - Factor7:1.83; e - ISO Factor8:0.32; Y - ISO Factor9:1.88; G1 - Heat Generation Factor (Roller-Raceway):751.2; G2 - Heat Generation Factor (Rib-Roller End):101.5; Cg - Geometry Factor:0.117; |
12 mm x 25 mm x 12 mm NMB MBT12 plain bearings | Series:HM237500; Cone Part Number:HM237532; Cup Part Number:HM237511; Design Units:Imperial; Bearing Weight:17.50 Kg; Cage Type:Stamped Steel; d:160.325 mm; D:288.925 mm; B - Cone Width:63.5 mm; C - Cup Width:47.625 mm; B:63.505 mm; R - Cone Backface To Clear Radius1:7.110 mm; r - Cup Backface To Clear Radius2:3.30 mm; da - Cone Frontface Backing Diameter:181.10 mm; db - Cone Backface Backing Diameter:192.02 mm; Da - Cup Frontface Backing Diameter:271.30 mm; Db - Cup Backface Backing Diameter:265.94 mm; Ab - Cage-Cone Frontface Clearance:5.1 mm; Aa - Cage-Cone Backface Clearance:5.1 mm; a - Effective Center Location3:-11.7 mm; C90 - Dynamic Radial Rating (90 million revolutions)4:56900 lbf; C1 - Dynamic Radial Rating (1 million revolutions)5:219000 lbf; C0 - Static Radial Rating:278000 lbf; Ca90 - Dynamic Thrust Rating (90 million revolutions)6:31100 lbf; K - Factor7:1.83; e - ISO Factor8:0.32; Y - ISO Factor9:1.88; G1 - Heat Generation Factor (Roller-Raceway):751.2; G2 - Heat Generation Factor (Rib-Roller End):101.5; Cg - Geometry Factor:0.117; |
9 mm x 24 mm x 7 mm NMB 609 deep groove ball bearings | Series:HM237500; Cone Part Number:HM237532; Cup Part Number:HM237511; Design Units:Imperial; Bearing Weight:17.50 Kg; Cage Type:Stamped Steel; d:160.325 mm; D:288.925 mm; B - Cone Width:63.5 mm; C - Cup Width:47.625 mm; B:63.505 mm; R - Cone Backface To Clear Radius1:7.110 mm; r - Cup Backface To Clear Radius2:3.30 mm; da - Cone Frontface Backing Diameter:181.10 mm; db - Cone Backface Backing Diameter:192.02 mm; Da - Cup Frontface Backing Diameter:271.30 mm; Db - Cup Backface Backing Diameter:265.94 mm; Ab - Cage-Cone Frontface Clearance:5.1 mm; Aa - Cage-Cone Backface Clearance:5.1 mm; a - Effective Center Location3:-11.7 mm; C90 - Dynamic Radial Rating (90 million revolutions)4:56900 lbf; C1 - Dynamic Radial Rating (1 million revolutions)5:219000 lbf; C0 - Static Radial Rating:278000 lbf; Ca90 - Dynamic Thrust Rating (90 million revolutions)6:31100 lbf; K - Factor7:1.83; e - ISO Factor8:0.32; Y - ISO Factor9:1.88; G1 - Heat Generation Factor (Roller-Raceway):751.2; G2 - Heat Generation Factor (Rib-Roller End):101.5; Cg - Geometry Factor:0.117; |
3,175 mm x 7,938 mm x 3,571 mm NMB RIF-518ZZ deep groove ball bearings | Series:HM237500; Cone Part Number:HM237532; Cup Part Number:HM237511; Design Units:Imperial; Bearing Weight:17.50 Kg; Cage Type:Stamped Steel; d:160.325 mm; D:288.925 mm; B - Cone Width:63.5 mm; C - Cup Width:47.625 mm; B:63.505 mm; R - Cone Backface To Clear Radius1:7.110 mm; r - Cup Backface To Clear Radius2:3.30 mm; da - Cone Frontface Backing Diameter:181.10 mm; db - Cone Backface Backing Diameter:192.02 mm; Da - Cup Frontface Backing Diameter:271.30 mm; Db - Cup Backface Backing Diameter:265.94 mm; Ab - Cage-Cone Frontface Clearance:5.1 mm; Aa - Cage-Cone Backface Clearance:5.1 mm; a - Effective Center Location3:-11.7 mm; C90 - Dynamic Radial Rating (90 million revolutions)4:56900 lbf; C1 - Dynamic Radial Rating (1 million revolutions)5:219000 lbf; C0 - Static Radial Rating:278000 lbf; Ca90 - Dynamic Thrust Rating (90 million revolutions)6:31100 lbf; K - Factor7:1.83; e - ISO Factor8:0.32; Y - ISO Factor9:1.88; G1 - Heat Generation Factor (Roller-Raceway):751.2; G2 - Heat Generation Factor (Rib-Roller End):101.5; Cg - Geometry Factor:0.117; |
10 mm x 26 mm x 10 mm NMB RBT10E plain bearings | Series:HM237500; Cone Part Number:HM237532; Cup Part Number:HM237511; Design Units:Imperial; Bearing Weight:17.50 Kg; Cage Type:Stamped Steel; d:160.325 mm; D:288.925 mm; B - Cone Width:63.5 mm; C - Cup Width:47.625 mm; B:63.505 mm; R - Cone Backface To Clear Radius1:7.110 mm; r - Cup Backface To Clear Radius2:3.30 mm; da - Cone Frontface Backing Diameter:181.10 mm; db - Cone Backface Backing Diameter:192.02 mm; Da - Cup Frontface Backing Diameter:271.30 mm; Db - Cup Backface Backing Diameter:265.94 mm; Ab - Cage-Cone Frontface Clearance:5.1 mm; Aa - Cage-Cone Backface Clearance:5.1 mm; a - Effective Center Location3:-11.7 mm; C90 - Dynamic Radial Rating (90 million revolutions)4:56900 lbf; C1 - Dynamic Radial Rating (1 million revolutions)5:219000 lbf; C0 - Static Radial Rating:278000 lbf; Ca90 - Dynamic Thrust Rating (90 million revolutions)6:31100 lbf; K - Factor7:1.83; e - ISO Factor8:0.32; Y - ISO Factor9:1.88; G1 - Heat Generation Factor (Roller-Raceway):751.2; G2 - Heat Generation Factor (Rib-Roller End):101.5; Cg - Geometry Factor:0.117; |
1,397 mm x 4,762 mm x 2,779 mm NMB RIF-3ZZ deep groove ball bearings | Series:HM237500; Cone Part Number:HM237532; Cup Part Number:HM237511; Design Units:Imperial; Bearing Weight:17.50 Kg; Cage Type:Stamped Steel; d:160.325 mm; D:288.925 mm; B - Cone Width:63.5 mm; C - Cup Width:47.625 mm; B:63.505 mm; R - Cone Backface To Clear Radius1:7.110 mm; r - Cup Backface To Clear Radius2:3.30 mm; da - Cone Frontface Backing Diameter:181.10 mm; db - Cone Backface Backing Diameter:192.02 mm; Da - Cup Frontface Backing Diameter:271.30 mm; Db - Cup Backface Backing Diameter:265.94 mm; Ab - Cage-Cone Frontface Clearance:5.1 mm; Aa - Cage-Cone Backface Clearance:5.1 mm; a - Effective Center Location3:-11.7 mm; C90 - Dynamic Radial Rating (90 million revolutions)4:56900 lbf; C1 - Dynamic Radial Rating (1 million revolutions)5:219000 lbf; C0 - Static Radial Rating:278000 lbf; Ca90 - Dynamic Thrust Rating (90 million revolutions)6:31100 lbf; K - Factor7:1.83; e - ISO Factor8:0.32; Y - ISO Factor9:1.88; G1 - Heat Generation Factor (Roller-Raceway):751.2; G2 - Heat Generation Factor (Rib-Roller End):101.5; Cg - Geometry Factor:0.117; |
28 mm x 50 mm x 28 mm NMB MBT28 plain bearings | Series:HM237500; Cone Part Number:HM237532; Cup Part Number:HM237511; Design Units:Imperial; Bearing Weight:17.50 Kg; Cage Type:Stamped Steel; d:160.325 mm; D:288.925 mm; B - Cone Width:63.5 mm; C - Cup Width:47.625 mm; B:63.505 mm; R - Cone Backface To Clear Radius1:7.110 mm; r - Cup Backface To Clear Radius2:3.30 mm; da - Cone Frontface Backing Diameter:181.10 mm; db - Cone Backface Backing Diameter:192.02 mm; Da - Cup Frontface Backing Diameter:271.30 mm; Db - Cup Backface Backing Diameter:265.94 mm; Ab - Cage-Cone Frontface Clearance:5.1 mm; Aa - Cage-Cone Backface Clearance:5.1 mm; a - Effective Center Location3:-11.7 mm; C90 - Dynamic Radial Rating (90 million revolutions)4:56900 lbf; C1 - Dynamic Radial Rating (1 million revolutions)5:219000 lbf; C0 - Static Radial Rating:278000 lbf; Ca90 - Dynamic Thrust Rating (90 million revolutions)6:31100 lbf; K - Factor7:1.83; e - ISO Factor8:0.32; Y - ISO Factor9:1.88; G1 - Heat Generation Factor (Roller-Raceway):751.2; G2 - Heat Generation Factor (Rib-Roller End):101.5; Cg - Geometry Factor:0.117; |
12 mm x 25 mm x 12 mm NMB MBG12CR plain bearings | Series:HM237500; Cone Part Number:HM237532; Cup Part Number:HM237511; Design Units:Imperial; Bearing Weight:17.50 Kg; Cage Type:Stamped Steel; d:160.325 mm; D:288.925 mm; B - Cone Width:63.5 mm; C - Cup Width:47.625 mm; B:63.505 mm; R - Cone Backface To Clear Radius1:7.110 mm; r - Cup Backface To Clear Radius2:3.30 mm; da - Cone Frontface Backing Diameter:181.10 mm; db - Cone Backface Backing Diameter:192.02 mm; Da - Cup Frontface Backing Diameter:271.30 mm; Db - Cup Backface Backing Diameter:265.94 mm; Ab - Cage-Cone Frontface Clearance:5.1 mm; Aa - Cage-Cone Backface Clearance:5.1 mm; a - Effective Center Location3:-11.7 mm; C90 - Dynamic Radial Rating (90 million revolutions)4:56900 lbf; C1 - Dynamic Radial Rating (1 million revolutions)5:219000 lbf; C0 - Static Radial Rating:278000 lbf; Ca90 - Dynamic Thrust Rating (90 million revolutions)6:31100 lbf; K - Factor7:1.83; e - ISO Factor8:0.32; Y - ISO Factor9:1.88; G1 - Heat Generation Factor (Roller-Raceway):751.2; G2 - Heat Generation Factor (Rib-Roller End):101.5; Cg - Geometry Factor:0.117; |
3,175 mm x 9,525 mm x 3,967 mm NMB RF-2 deep groove ball bearings Video
Bearing RF-2 (NMB) | Size and Specification | Bearings Online
Deep groove ball bearings RF-2. Bearing number : RF-2. Size (mm) : 3.175x9.525x3.967. Brand : NMB. Bore Diameter (mm) : 3,175. Outer Diameter (mm) :
Bearing RF-2 NMB - Leader Bearing
Deep groove ball bearings RF-2. Bearing number : RF-2. Size mm : 3.175x9.525x3.967. Brand : NMB. Bore Diameter mm : 3,175. Outer Diameter mm : 9,525
3175 mm x 9525 mm x 3967 mm NMB RF-2 deep groove ball bearings
Find the discount 3175 mm x 9525 mm x 3967 mm NMB RF-2 deep groove ball bearings online you need 3175 mm x 9525 mm x 3967 mm . We offer ... If you
NMB RF-2 deep groove ball bearings - LYC BEARING CORP.OF
Brand Name: NMB. Model Number: RF-2. Manufacturer Name: SCHAEFFLER GROUP. Category: Bearings. Minimum Buy Quantity: N/A. Product Group: B04311
RF-2 Flanged Open Miniature Ball Bearings | NMB
Print these specs. Category. Inch Series Bearings. Part Number. RF-2. Inch. Flanged Open. Bore Diameter. 3.175 [mm]. Outside Diameter. 9.525 [mm]. Width
3175 mm x 9525 mm x 3967 mm NMB RF-2 deep groove ball
3,175 mm x 9,525 mm x 3,967 mm NMB R... Bearing No. RF-2. Size. 3.175x9.525x3.967 mm. Bore Diameter. 3,175 mm. Outer Diameter. 9,525 mm. Width
NMB 607ZZ deep groove ball bearings - BEARING-SINGAPORE
How 3175 mm x 9525 mm x 3967 mm do you find the 3175 mm x 9525 mm x 3967 mm NMB RF-2 deep groove ball bearings specification? Manufacturers
RF-2 Inch Series Bearings - NMB Technologies
RF-2. Inch Series Bearings. NMB Technologies Corporation - A MinebeaMitsumi Group Company - 39830 Grand River Avenue - Novi, MI 48375 info@nmbtc