Whittet Higgins KM-21 Retaining Nut M105 x 2.0
- T M105 × 2
- D 140.0 mm
- B 18.0 mm
Genuine Whittet-Higgins product, Whittet-Higgins
- Regular price
- $66.56
- Sale price
- $66.56
- Regular price
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Quantity pricingApplied at checkout
- 20–49 5% off$63.23 ea
- 50–99 8% off$61.24 ea
- 100–199 15% off$56.58 ea
- 200–499 18% off$54.58 ea
- 500+ 25% off$49.92 ea
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Whittet-Higgins KM-21
$66.56
Why Apollo USA
Bearing locknuts and retaining parts from Apollo Industries, Oxford, Michigan
Apollo Industries supplies bearings, locknuts, lockwashers and maintenance tools to businesses across the US, with real people on the phone when you need a part matched.
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Same-day shipping
Order by 3 PM EST for same-day shipping.
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Free shipping over $100
All orders over $100 ship free by ground with code FREESHIP.
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90-day returns
Hassle-free returns on unused items within 90 days.
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Price match
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Expert support
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2695 Lake George RdOxford, MI 48370
Overview
Whittet-Higgins KM-21
The Whittet-Higgins KM-21 is a metric bearing locknut manufactured to meet and exceed the ISO 2982-2:2013(E) specification. Threaded onto a shaft, it secures, locks, and retains bearings and power transmission assemblies while delivering accurate angular positioning through numerous locking positions.
It is used together with matched MB series lockwashers: an external tab on the lockwasher bends into a slot on the locknut to prevent the assembly from loosening due to vibration, shock, and torque, with no special tools required for installation. Made from carbon steel, it is effective on both soft and hardened shafts, rated to a maximum operating temperature of 300°F, manufactured in the USA, and RoHS compliant.
Key features
- Metric bearing locknut machined from carbon steel
- Meets and exceeds the ISO 2982-2:2013(E) specification
- Locks with matched MB series lockwashers; an external tab bends into a locknut slot
- Provides accurate angular positioning with numerous locking positions
- Prevents assembly loosening due to vibration, shock, and torque
- Effective on both soft and hardened shafts
- No special tools required for installation
- Maximum operating temperature of 300°F
- Manufactured in the USA and RoHS compliant
Specifications
Whittet-Higgins KM-21 dimensions & specifications
- PDFKM-21 part print (opens in a new tab)
- STEP3D CAD model (opens in a new tab)
- PDFKM series spec sheet (opens in a new tab)
Files from Whittet-Higgins. They open in a new tab.
- Type
- Locknut
- Thread T
- M105 × 2 (pitch 2 mm)
- Outside diameter (max.) D
- 140.0 mm (5.512 in)
- Face diameter (max.) F
- 126.0 mm (4.961 in)
- Width (max.) B
- 18.0 mm (0.709 in)
- Theoretical axial load
- 782 kN (175,801 lbf)
- Material
- Carbon Steel
- Country of origin
- USA
- Series
- Locknut KM series (metric)
- Standard
- ISO 2982-2:2013 meets and exceeds
- Weight
- 1.92 lb
- Brand
- Whittet-Higgins
- Part number
- KM-21 also written KM21
- UPC / EAN
- 751968602101
Use it with
Parts and tools for your KM-21
What Whittet-Higgins pairs with the KM-21. Tick what you need and add it with one click.
Same size, other versions
Other versions of the KM-21
The same size in other Whittet-Higgins series: left-hand thread, stainless steel, high strength, precision or self-locking designs.
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Whittet-Higgins
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KMS-21Whittet Higgins KMS-21 Retaining Nut M105 x 2.0
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BLM-21Whittet Higgins BLM-21 Bearhug Retaining Nut M105 x 2,0
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$372.92
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BML-21Whittet Higgins BML-21 Bearhug Left Handed Retaining Nut
Bearhug BM series (left-handed) · left-hand thread
$393.45
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BMM-21Whittet Higgins BMM-21 Bearhug Retaining Nut Hardened Alloy - High Strength
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BMS-21Whittet Higgins BMS-21 Bearhug Retaining Nut Stainless
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$454.55
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Part number explained
What every part of KM-21 means
- KM
- Locknut, Locknut KM series (metric)
- 21
- Size 21: M105 × 2 thread
Catalogs & documents
Whittet-Higgins KM-21 catalogs & documents
Official catalogs and data from the manufacturer. They open as PDFs in a new tab.
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Product document
Catalog Locknut – KM Series (Metric) (opens in a new tab)
PDF · AllPagesDrop pages
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Catalog
Whittet-Higgins Handbook of Engineering & Design (rev. 2018) (opens in a new tab)
PDF · 93.0 MB · English
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Mounting
Whittet-Higgins Assembly Instructions (opens in a new tab)
PDF · 0.2 MB · English
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Safety
Whittet-Higgins Standard Statements: Prop 65, RoHS3, REACH (opens in a new tab)
PDF · 0.1 MB · English
About the brand
About Whittet-Higgins
Bearing locknuts, lockwashers and retaining devices from Rhode Island since 1914.
Henry Whittet and John Higgins founded the Whittet-Higgins Manufacturing Company in 1914 in the basement of a mill on Congress Avenue in Providence, Rhode Island, making super-precision bearing retaining components and machined parts for local machine builders such as Brown & Sharpe.
In 1967 the company was sold to a young mechanical engineer, and in 1969 it moved to 33 Higginson Avenue in Central Falls, Rhode Island, where it still makes its products. Its first line of 66 locknuts and lockwashers has grown to more than 4,300 standard parts, made on robotic CNC systems.
Besides the standard N/AN and KM locknuts with W and MB lockwashers, Whittet-Higgins makes its own self-locking designs: Bearhug prevailing-torque locknuts, Bearlok, Shoelok and Tangentlok clamping locknuts, clampnuts and splitnuts, plus adapter sets, clamp collars and installation tools. The company is family owned and operated.
Genuine Whittet-Higgins product from an authorized retailer
Founded
1914
Headquarters
Central Falls, Rhode Island, USA
Standard parts
More than 4,300
Made in
Central Falls, Rhode Island
Known for
- Bearing locknuts and lockwashers, inch and metric
- Bearhug self-locking locknuts
- Clampnuts, splitnuts and clamp collars
- Adapter sets and installation tools
Apollo Industries is an authorized Whittet-Higgins retailer. All Whittet-Higgins trademarks and product names are the property of their respective owners.
FAQ
KM-21 questions & answers
What size is the Whittet-Higgins KM-21?
The Whittet-Higgins KM-21 is a locknut. Thread: M105 × 2 (pitch 2 mm). Outside diameter: 140.0 mm (5.512 in). Face diameter: 126.0 mm (4.961 in). Width: 18.0 mm (0.709 in). These are Whittet-Higgins' maximum sizes from its spec sheet.
What thread does the KM-21 fit?
The Whittet-Higgins KM-21 fits a M105 × 2 right-hand shaft thread (pitch 2 mm).
Does the KM-21 need a lockwasher?
Yes. Whittet-Higgins matches the KM-21 with the MB-21 or MBA-21 lockwasher. The washer's inner tab sits in the shaft's keyway, and after tightening one of its outer tangs is bent into a slot of the locknut so the nut cannot turn.
What tool installs the KM-21?
Whittet-Higgins' BASM-21 assembly socket: it holds all four spanner slots and takes a square-drive ratchet or torque wrench. Or the PAS-18-24 adjustable spanner wrench. To clean or repair the shaft thread first, Whittet-Higgins makes the RTDM-21 rethreading die.
What temperature can the KM-21 take?
Whittet-Higgins rates the Locknut KM series (metric) for up to 300 °F (149 °C).
What is the KM-21 made of?
Locknut: carbon steel.
Is there a drawing or CAD model of the KM-21?
Yes. Whittet-Higgins publishes a part print (PDF) and a 3D CAD model (STEP) for the KM-21. The drawing on this page is made from the same catalog dimensions.
How do I install the KM-21?
Follow Whittet-Higgins' assembly instructions for this part (PDF). Fit the lockwasher with its inner tab in the shaft keyway, tighten the locknut to the bearing maker's preload, then bend the nearest tang into a slot.
Is this a genuine Whittet-Higgins locknut?
Yes. Apollo Industries is an authorized Whittet-Higgins retailer, and every Whittet-Higgins part we sell is genuine, made by Whittet-Higgins in Central Falls, Rhode Island, USA.
Do you ship the KM-21 the same day?
In-stock orders placed by 3 PM EST ship the same day. All orders over $100 ship free by ground with code FREESHIP.
Can I get quantity pricing or buy tax-exempt?
Yes. Apollo offers special rates for businesses and bulk orders. Use Request a quote on this page or call (248) 429-9073.
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