Used aircraft engines one direction needle bearing NKI 25/20

Brif introdutions of Used aircraft engines bearing NKI 25/20

Needle roller bearings are roller bearings with cylindrical rollers that are small in diameter. In spite of their low cross section, needle roller bearings have a high load carrying capacity and are therefore extremely suitable for bearing arrangements where radial space is limited.

Needle Roller Bearings have a high load carrying capacity and can operate at high speeds. They have slim design and are suited where radial space is limited. They are available with or without an inner ring.

 

 

Needle roller bearings with inner rings are used if the shaft cannot be used as a raceway.

Needle bearings feature a smaller cross-section, higher load-carrying capacity, greater rigidity, and lower inertia forces that facilitate size and weight reductions in machinery. They’re designed to withstand oscillation, perform under severe conditions, and interchange with sliding bearings.

Diverse types of needle bearings are available in a wide variety of sizes and tolerances, for a multitude of applications.

• Needle roller and cage assemblies are offered in single or double row, solid or split cage, metric and inch sizes; as well as in connecting rod bearings for special applications.
• Single and double row bearings are available with or without ribs, and with or without inner rings.
• Thrust bearings are offered in single row roller and cage assemblies.
• Yoke and stud type track rollers are also available.
  

Needle roller bearings are a bearing that is classified as either radial or thrust depending on the direction of the load being supported. Needle roller bearings include bearings whose rollers slightly exceed the size range of needle rollers as stipulated by ISO. Needle roller bearings include drawn cup and solid radial bearings, as well as application-specific cam followers, and roller followers. Thrust bearings include thrust needle bearings.

Needle bearings feature a smaller cross-section, higher load-carrying capacity, greater rigidity, and lower inertia forces that facilitate size and weight reductions in machinery. They're designed to withstand oscillation, perform under severe conditions, and interchange with sliding bearings.

Speicifications of  Used aircraft engines bearing NKI 25/20

 

Dimensions(mm)					Standard mounting dimensions(mm)
d	D	C	1) γs min	F	da min	da max	Da max
25	38	20	0.3	29	27	28	36
Basic dynamic load rating Cr N	Basic static load rating Cor N	Limiting speed 2) rpm	Designation				Weight g
			NA 49	NA 59	NA 69	NKI
21 600	37 200	14 000	----	----	----	NKI 25/20	82

 

Structure of  Used aircraft engines bearing NKI 25/20

This kind of bearings has multiple structures, such as narrow & wide type, with or without inner races, cages, ribs or seals.
Accuracy: Dimensional tolerance and geometrical accuracy is based on GB/T 5801(ISO. 1206)
The mutual-difference of needle's diameter is 2μ M, precision grade G2(ISO/GB309)

The diameter of inscribed circle conforms to tolerance grade F6 before the fitting of outer ring with cage and roller assembly.
Clearance conforms to the value defined by 0 group of GB/T4604 (ISO 5753)
Special precision grade is based on GB/T307 (ISO 492, DIN 620)
Materials: Material for needle roller is GCr15 (100Cr6) bearing steel, quench-hardness HRC60---65.
Material for inner and outer rings is GCr15 (100Cr6) bearing steel, quench-hardess HRC61---65.
Material for cages is low-carbon steel or nylon 66.

Material for needle roller is GCr15 bearing steel, quench-hardening HRC60---65.
Material for inner and outer races is GCr15 bearing steel, quench-hardening HRC61---65.
Material for cages is quality low-carbon steel or reinforced nylon.

Special Directions of  Used aircraft engines bearing NKI 25/20
Bearing running clearance and inner-cutting roundness should be regulated according to different conditions.
Machine tools should be used for press-in fitting or thermal fitting of the bearing
Limited by plastic cages (suffixed with TN) and sealing-element material, operating temperature is -300C---+1000C.
For general-disposition design of bearings, refer to the relevant recommendation in the applied technology of 

rolling bearings.

Applications of  Used aircraft engines bearing NKI 25/20

• Gear pumps
• Mud pumps
• Oil field pumping jacks
• Helicopter rotors and transmissions
• Telehandlers
• Material handling equipment
• Hydraulic pumps
• Sheave Blocks
• Hoist drum shaft
• Marine crankshafts and connecting rods
• Pipe handling tables in steel mill equipment
• Paper punch presses
• Planet gears and mainshaft bearings of a clutch drive or mechanical press
• Calendar rolls in textile machinery
• Railroad tampering equipment

• products:

  HK BK series
  HK. RS HK. 2RS series
  BK. RS series
  NA RNA NK series
  HF FC Series
  HFL FCB series
  K series KZK KBK series
  AXK series AS GS 811 WS811
  NATR NATV. PP series
  NUTR. NUTR X series
  IR IR series
  NKIA NKIB series

  HK Drawn cup needle roller bearings with open ends
  HK-RS Drawn cup needle roller bearings with open ends, two ends with seal ring
  HK-2RS Drawn cup needle roller bearings with open ends, two ends with seal ring
  BK Drawn cup needle roller bearings with closed end
  BK-RS Drawn cup needle roller bearings with closed end, one end with seal ring
  F- Drawn cup needle roller bearings with open ends, full component
  FY-Drawn cup needle roller bearings with open ends, full component greased
  MF- Drawn cup needle roller bearing with closed end, full component
  MFY- Drawn cup needle roller bearing with closed end, full component, greased

   

  Model numbers of NKI series needle roller bearings
  

 

Bearing No.	d	D	B
NKI 5/12 TN	5 mm	15 mm	12 mm
NKI 5/16 TN	5 mm	15 mm	16 mm
NKI 6/12 TN	6 mm	16 mm	12 mm
NKI 6/16 TN	6 mm	16 mm	16 mm
NKI 7/12 TN	7 mm	17 mm	12 mm
NKI 7/16 TN	7 mm	17 mm	16 mm
NKI 9/12	9 mm	19 mm	12 mm
NKI 9/16	9 mm	19 mm	16 mm
NKI 10/16	10 mm	22 mm	16 mm
NKI 10/20	10 mm	22 mm	20 mm
NKI 12/16	12 mm	24 mm	16 mm
NKI 12/20	12 mm	24 mm	20 mm
NKI 15/16	15 mm	27 mm	16 mm
NKI 15/20	15 mm	27 mm	20 mm
NKI 17/16	17 mm	29 mm	16 mm
NKI 17/20	17 mm	29 mm	20 mm
NKI 20/16	20 mm	32 mm	16 mm
NKI 20/20	20 mm	32 mm	20 mm
NKI 22/16	22 mm	34 mm	16 mm
NKI 22/20	22 mm	34 mm	20 mm
NKI 25/20	25 mm	38 mm	20 mm
NKI 25/30	25 mm	38 mm	30 mm
NKI 28/20	28 mm	42 mm	20 mm
NKI 28/30	28 mm	42 mm	30 mm
NKI 30/20	30 mm	45 mm	20 mm
NKI 30/30	30 mm	45 mm	30 mm
NKI 32/20	32 mm	47 mm	20 mm
NKI 32/30	32 mm	47 mm	30 mm
NKI 35/20	35 mm	50 mm	20 mm
NKI 35/30	35 mm	50 mm	30 mm
NKI 38/20	38 mm	53 mm	20 mm
NKI 38/30	38 mm	53 mm	30 mm
NKI 40/20	40 mm	55 mm	20 mm
NKI 40/30	40 mm	55 mm	30 mm
NKI 42/20	42 mm	57 mm	20 mm