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Product DetailSpecification/Dimensions
-
type
- 7E-HMK
- 7□□
- BK
- DCL
- HK
- HMK
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Load Direction
- Radial
- Thrust
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Inner Dia. d(Ø)
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Outer Dia. D(Ø)
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Width B(mm)
-
Number of Raceway Ring Rows
- Single Row
- Double Row
-
Size Standards
- Metric System
- Inch Base
-
Retainer Type
- Resin Forming
- Weld Shape
-
Sealing Structure
- Double-sided Seal Type
- Double-sided seal type
- NA
- One-sided Seal Type
-
Lubricant
- Available
- N/A
- NA
-
Format symbol
-
Holder Symbol
- T2 (Polyamide Resin Forming Holder)
- C (Weld Holder)
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Specifications
- Closed End
- Open End
- Open End Double-sided Seal
- Open End Multiple-Row Type
- Open End One-sided Seal
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Revolution Frequency(rpm)
-
Series
- Heavy Load
- Heavy duty
- Inch
- Standard
-
Case hardening (outer ring only)
- Case hardening
- N/A
- NA
-
Outer ring oil hole
- Available
- N/A
- NA
-
Premium shell bearing
- Available
- N/A
- NA
-
Post-assembly heat treatment (pre-bent type)
- Available
- N/A
- NA
-
CAD
- 2D
- 3D
Days to Ship
-
- All
- Same day
- 5 Day(s) or Less
- 6 Day(s) or Less
- 8 Day(s) or Less
- 9 Day(s) or Less
- 10 Day(s) or Less
- 11 Day(s) or Less
- 12 Day(s) or Less
Specify Alterations
Drawn Cup Needle Roller Bearing, Outer Ring (BK0408T2)
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Product DetailProduct Description
A bearing in which an outer ring is formed from a thin steel plate by precision drawing, the raceway surface is surface-hardened, and then a needle-shaped roller and a retainer are assembled.
[Features]
・ It has the smallest cross-sectional height of any bearing with an outer ring, enabling space reduction and cost savings.
・ Compact design is possible with the shaft directly as the raceway surface without using the inner ring.
・ The outer ring has a structure in which the needle roller and the retainer are not separated.
・ Retaining rings are not required for fixing in the axial direction by simply press-fitting into a rigid housing with an appropriate fit.
[Applications]
・ Heavy load, high speed, gearbox for automobiles, etc.
・ Steel equipment, mining / construction machinery, machine tools.
Drawing
HK type, HMK type (Open-ended type)
HK, ZWD type (Open-ended type)
BK type (Closed end type)
BK ‥ ZWD type (Closed end type)
Product features details
Shell-type needle roller bearings that can reduce space and cost
It is a bearing in which an outer ring is formed from a thin steel plate by precision drawing, the raceway surface is surface-hardened, and then a needle-shaped roller and a retainer are assembled (as for the part numbers with "M" in the suffix, they are heat treated after assembling). It has the smallest cross-sectional height of any bearing with an outer ring, enabling space reduction and cost savings.
Usually, a design is taken in which the shaft is directly used as the raceway surface without using the inner ring. The outer ring has a structure in which the needle-shaped roller and the retainers are not separated, and the bearing is easy to handle because it does not require a retaining ring to fix it in the axial direction, just by press-fitting it into a rigid housing with an appropriate fit.
Type, structure, and features of shell needle roller bearings
| Type | Compatible shaft diameter (mm) | Nominal Number | Composition and dimensions | Note | ||
|---|---|---|---|---|---|---|
| HK (HK・・T2) | Standard Series | Open End | ø3 to ø50 | HK0609T2 | Diameter of Inscribed Circle: ø6 Width dimensions: 9 T2: Resin retainer | Since the suffix T2 uses a polyamide resin molding retainer, the allowable temperature should be 120°C, and 100°C or less for continuous use. Premium shell bearings have F in the suffix. See CATNO.3029 (Premium Shell Bearing) for details. Those with an M in the suffix are heat-treated products after assembly. (Pre-vent specifications) |
| HK・・L | Open End One-sided seal | ø12 to ø50 | HK2018L/3AS | Diameter of Inscribed Circle: ø20 Width dimensions: 18 L: One-sided seal 3AS: Grease | The seal type (tailing symbol: L or LL) with a built-in synthetic rubber sealing seal on one side or both sides has lithium soap-based grease sealed inside. To prevent deterioration of the seal and grease, the operating temperature should be -20 to 120°C, and within 100°C for continuous use. This type has a shorter roller length and a smaller rated load than the open type with the same dimensions. | |
| HK・・LL | Open End Double-sided seal | ø12 to ø50 | HK2020LL/3AS | Diameter of Inscribed Circle: ø20 Width dimensions: 20 LL: Double-sided seal 3AS: Grease | ||
| HK・・ZWD | Open End Double row type | ø15 to ø30 | HK2030ZWD | Diameter of Inscribed Circle: ø20 Width dimensions: 30 ZW: Retainer double row D: Outer ring lubrication hole | This type has a lubrication hole in the outer ring. | |
| HMK (HMK・・T2) | Open End | ø8 to ø50 | HMK2015 | Diameter of Inscribed Circle: ø20 Width dimensions: 15 | Since the suffix T2 uses a polyamide resin molding retainer, the allowable temperature should be 120°C, and 100°C or less for continuous use. | |
| HMK・・L | Open End One-sided seal | ø8 to ø50 | HMK2018L/3AS | Diameter of Inscribed Circle: ø20 Width dimensions: 18 L: One-sided seal 3AS: Grease | The seal type (tailing symbol: L or LL) with a built-in synthetic rubber sealing seal on one side or both sides has lithium soap-based grease sealed inside. To prevent deterioration of the seal and grease, the operating temperature should be -20 to 120°C, and within 100°C for continuous use. This type has a shorter roller length and a smaller rated load than the open type with the same dimensions. | |
| HMK・・LL | Open End Double-sided seal | ø8 to ø50 | HMK2021LL/3AS | Diameter of Inscribed Circle: ø20 Width dimensions: 20 LL: Double-sided seal 3AS: Grease | ||
| HMK・・ZWD | Open End Double row type | ø38 to ø50 | HK3845ZWD | Diameter of Inscribed Circle: ø38 Width dimensions: 45 ZW: Retainer double row D: Outer ring lubrication hole | This type has a lubrication hole in the outer ring. | |
| BK (BK・・T2) | Closed End | ø3 to ø50 | BK2020C | Diameter of Inscribed Circle: ø20 Width dimensions: 20 C: Welding retainer | Since the suffix T2 uses a polyamide resin molding retainer, the allowable temperature should be 120°C, and 100°C or less for continuous use. | |
| BK・・L | Closed End One-sided seal | ø12 to ø50 | BK2018L/3AS | Diameter of Inscribed Circle: ø20 Width dimensions: 18 L: One-sided seal 3AS: Grease | This seal type (suffix: L) has lithium soap-based grease sealed inside. To prevent deterioration of the seal and grease, the operating temperature should be -20 to 120°C, and continuous use should be within 100°C. | |
| BK・・ZWD | Closed End Double row type | ø15 to ø30 | BK2030ZWD | Diameter of Inscribed Circle: ø20 Width dimensions: 30 ZW: Retainer double row D: Outer ring lubrication hole | This type has a lubrication hole in the outer ring. | |
About allowable rotational speed
The permissible rotational speed is the permissible rotational speed that can be achieved based on the following assumptions.
- Use under conditions where an appropriate amount of grease recommended by NTN is sealed, and the heat generated by sufficient familiar operation, cooling of the outer cylinder, etc., is removed.
- Use with constant pressure preload.
| Part Number |
|---|
| BK0408T2 |
| Part Number | Price | Minimum Order Qty. | Volume Discount | Days to Ship | RoHS | Load Direction | Inner Dia. d (Ø) | Outer Dia. D (Ø) | Width B (mm) | Number of Raceway Ring Rows | Size Standards | Retainer Type | Basic Load Rating: Dynamic Load (N) | Sealing Structure | Lubricant | Format symbol | Holder Symbol | Specifications | Revolution Frequency (rpm) | Series | Case hardening (outer ring only) | Outer ring oil hole | Premium shell bearing | Post-assembly heat treatment (pre-bent type) |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
₹ 316.45 | 1 Piece(s) | 8 Day(s) or more | 10 | Radial | 4 | 8 | 8 | Single Row | Metric System | Resin Forming | 1770 | NA | NA | BK | T2 (Polyamide Resin Forming Holder) | Closed End | 30000 | Standard | NA | NA | NA | NA |
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Basic Information
| Raceway Ring Shape | Needle Roller | Outer Ring | With Outer Ring | Inner/Outer Ring Material | Steel |
|---|---|---|---|---|---|
| Specifications/Environment | Standard | Rolling Element Material | Steel | Outer Ring Type | Flat |
Please check the type/dimensions/specifications of the part BK0408T2 in the Drawn Cup Needle Roller Bearing, Outer Ring series.
- The specifications and dimensions of some parts may not be fully covered. For exact details, refer to manufacturer catalogs .
Product variants
| Part Number |
|---|
| 7E-HMK3220 |
| 7E-HMK3230 |
| 7E-HMK4020 |
| BK0509 |
| BK0709 |
| BK1010 |
| Part Number | Standard Unit Price | Minimum order quantity | Volume Discount | Days to Ship | RoHS | Load Direction | Inner Dia. d (Ø) | Outer Dia. D (Ø) | Width B (mm) | Number of Raceway Ring Rows | Size Standards | Retainer Type | Basic Load Rating: Dynamic Load (N) | Sealing Structure | Lubricant | Format symbol | Holder Symbol | Specifications | Revolution Frequency (rpm) | Series | Case hardening (outer ring only) | Outer ring oil hole | Premium shell bearing | Post-assembly heat treatment (pre-bent type) |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
₹ 790.60 | 1 Piece(s) | 11 Day(s) or more | - | Radial | 32 | 42 | 20 | Single Row | Metric System | - | 27500 | NA | NA | HMK | - | Open End | 5000 | Heavy Load | Case hardening | NA | NA | NA | ||
₹ 857.56 | 1 Piece(s) | 11 Day(s) or more | 10 | Radial | 32 | 42 | 30 | Single Row | Metric System | - | 41500 | NA | NA | HMK | - | Open End | 5000 | Heavy Load | Case hardening | NA | NA | NA | ||
₹ 995.53 | 1 Piece(s) | 11 Day(s) or more | - | Radial | 40 | 50 | 20 | Single Row | Metric System | - | 32500 | NA | NA | HMK | - | Open End | 4000 | Heavy Load | Case hardening | NA | NA | NA | ||
₹ 327.16 | 1 Piece(s) | 5 Day(s) or more | 10 | Radial | 5 | 9 | 9 | Single Row | Metric System | - | 2640 | NA | NA | BK | - | Closed End | 27000 | Standard | NA | NA | NA | NA | ||
₹ 295.02 | 1 Piece(s) | 8 Day(s) or more | - | Radial | 7 | 11 | 9 | Single Row | Metric System | - | 3400 | NA | NA | BK | - | Closed End | 23000 | Standard | NA | NA | NA | NA | ||
₹ 321.80 | 1 Piece(s) | 5 Day(s) or more | 10 | Radial | 10 | 14 | 10 | Single Row | Metric System | - | 4500 | NA | NA | BK | - | Closed End | 16000 | Standard | NA | NA | NA | NA |
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