Whittet Higgins BM-21 Bearhug Retaining Nut
- T M105 × 2
- D 140.0 mm
- B 21.0 mm
Genuine Whittet-Higgins product, Whittet-Higgins
- Regular price
- $159.51
- Sale price
- $159.51
- Regular price
-
Quantity pricingApplied at checkout
- 20–49 5% off$151.53 ea
- 50–99 8% off$146.75 ea
- 100–199 15% off$135.58 ea
- 200–499 18% off$130.80 ea
- 500+ 25% off$119.63 ea
Same-day shipping
Order by 3 PM ET for same-day shipping
Free shipping on orders over $100
Use code at checkout.
Whittet-Higgins BM-21
$159.51
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.
-
Same-day shipping
Order by 3 PM EST for same-day shipping.
-
Free shipping over $100
All orders over $100 ship free by ground with code FREESHIP.
-
90-day returns
Hassle-free returns on unused items within 90 days.
-
Price match
Show us a competitor's advertised price on the same item and we will match it.
-
Expert support
Support staff available by phone, web chat or email.
-
Need tax exemption or quantity pricing?
We offer special rates for businesses and bulk orders.
Talk to a parts specialist
2695 Lake George RdOxford, MI 48370
Overview
Whittet-Higgins BM-21 Bearhug retaining nut
The Whittet-Higgins BM-21 Bearhug is a metric, prevailing-torque self-locking bearing locknut used to secure and preload bearings, sleeves, and other components on a threaded shaft. An integral heat-stabilized polymer locking ring grips the shaft threads to resist loosening from vibration, shock, and torque, eliminating the separate lockwasher required by a traditional locknut-and-lockwasher assembly.
Machined from carbon steel and balanced for higher-speed service, it provides infinite adjustment and preloading without cutting or repairing a shaft keyway and without damaging the shaft threads. The BM-21 meets and exceeds the specifications of ISO 2982-2:2013(E).
Key features
- Prevailing-torque self-locking design that prevents loosening from vibration, shock, and torque
- Carbon steel locknut with an integral heat-stabilized polymer locking ring
- Meets and exceeds the specifications of ISO 2982-2:2013(E)
- Maximum operating temperature of 160 Deg F
- Metric thread sizes ranging from M10 x 0.75 through M200 x 3.0
- Eliminates the separate lockwasher and installs faster than a traditional locknut and lockwasher
- Does not damage shaft threads and removes the need to cut or repair a shaft keyway
- Infinite adjustment and preloading capability, balanced for higher-speed applications
- Manufactured in the USA and RoHS compliant
Specifications
Whittet-Higgins BM-21 dimensions & specifications
- PDFBM-21 part print (opens in a new tab)
- STEP3D CAD model (opens in a new tab)
- PDFBM series spec sheet (opens in a new tab)
Files from Whittet-Higgins. They open in a new tab.
- Type
- Bearhug self-locking 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
- 21.0 mm (0.827 in)
- Theoretical axial load
- 599 kN (134,661 lbf)
- Material
- Carbon Steel
- Country of origin
- USA
- Series
- Bearhug BM series (metric)
- Standard
- ISO 2982-2:2013 meets and exceeds
- Weight
- 1.78 lb
- Brand
- Whittet-Higgins
- Part number
- BM-21 also written BM21
- UPC / EAN
- 751968362104
Use it with
Parts and tools for your BM-21
What Whittet-Higgins pairs with the BM-21. Tick what you need and add it with one click.
Same size, other versions
Other versions of the BM-21
The same size in other Whittet-Higgins series: left-hand thread, stainless steel, high strength, precision or self-locking designs.
-
Whittet-Higgins
BML-21Whittet Higgins BML-21 Bearhug Left Handed Retaining Nut
Bearhug BM series (left-handed) · left-hand thread
$393.45
In stock
-
Whittet-Higgins
BMM-21Whittet Higgins BMM-21 Bearhug Retaining Nut Hardened Alloy - High Strength
Bearhug BMM series (high strength)
$364.05
In stock
-
Whittet-Higgins
BMS-21Whittet Higgins BMS-21 Bearhug Retaining Nut Stainless
Bearhug BMS series (stainless)
$454.55
In stock
-
Whittet-Higgins
BLM-21Whittet Higgins BLM-21 Bearhug Retaining Nut M105 x 2,0
Bearlok BLM series (metric)
$372.92
In stock
-
$204.90
In stock
-
$66.56
In stock
-
Whittet-Higgins
KML-21Whittet Higgins KML-21 Locknut- Lefthand Metric Threads
Locknut KML series (left-handed) · left-hand thread
$495.06
In stock
-
$253.22
In stock
Part number explained
What every part of BM-21 means
- BM
- Bearhug self-locking locknut, Bearhug BM series (metric)
- 21
- Size 21: M105 × 2 thread
Catalogs & documents
Whittet-Higgins BM-21 catalogs & documents
Official catalogs and data from the manufacturer. They open as PDFs in a new tab.
-
Product document
Catalog Bearhug – BM Series (Metric) (opens in a new tab)
PDF · AllPagesDrop pages
-
Catalog
Whittet-Higgins Handbook of Engineering & Design (rev. 2018) (opens in a new tab)
PDF · 93.0 MB · English
-
Mounting
Whittet-Higgins Assembly Instructions (opens in a new tab)
PDF · 0.2 MB · English
-
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
BM-21 questions & answers
What size is the Whittet-Higgins BM-21?
The Whittet-Higgins BM-21 is a Bearhug self-locking locknut. Thread: M105 × 2 (pitch 2 mm). Outside diameter: 140.0 mm (5.512 in). Face diameter: 126.0 mm (4.961 in). Width: 21.0 mm (0.827 in). These are Whittet-Higgins' maximum sizes from its spec sheet.
What thread does the BM-21 fit?
The Whittet-Higgins BM-21 fits a M105 × 2 right-hand shaft thread (pitch 2 mm).
Does the BM-21 need a lockwasher?
No. The Whittet-Higgins BM-21 locks itself: a heat-stabilized polymer locking ring grips the shaft thread (prevailing torque). It needs no lockwasher and no keyway in the shaft.
What tool installs the BM-21?
Whittet-Higgins' BASM-21 assembly socket: it holds all four spanner slots and takes a square-drive ratchet or torque wrench. To clean or repair the shaft thread first, Whittet-Higgins makes the RTDM-21 rethreading die.
What temperature can the BM-21 take?
Whittet-Higgins rates the Bearhug BM series (metric) for up to 160 °F (71 °C).
What is the BM-21 made of?
Locknut: carbon steel; Locking ring: heat-stabilized polymer.
Is there a drawing or CAD model of the BM-21?
Yes. Whittet-Higgins publishes a part print (PDF) and a 3D CAD model (STEP) for the BM-21. The drawing on this page is made from the same catalog dimensions.
How do I install the BM-21?
Follow Whittet-Higgins' assembly instructions for this part (PDF). In short: lubricate the shaft thread, turn the Bearhug on with its smaller bevel face toward the bearing, and tighten it with a spanner wrench or the BASM-21 assembly socket to the bearing maker's preload. Do not use it to push parts along the shaft.
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 BM-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.
Recently viewed
