Whittet Higgins NT-18 Locknut
- T 3.527-12
- D 4.312″
- B 0.385″
Genuine Whittet-Higgins product, Whittet-Higgins
- Regular price
- $47.94
- Sale price
- $47.94
- Regular price
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Quantity pricingApplied at checkout
- 20–49 5% off$45.54 ea
- 50–99 8% off$44.10 ea
- 100–199 15% off$40.75 ea
- 200–499 18% off$39.31 ea
- 500+ 25% off$35.96 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 NT-18
$47.94
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
Show us a competitor's advertised price on the same item and we will match it.
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Expert support
Support staff available by phone, web chat or email.
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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 NT-18 Locknut
The Whittet-Higgins NT-18 is a small-profile inch-series bearing locknut that secures, locks, and retains bearings and power transmission assemblies on a threaded shaft. Its reduced outside diameter and thickness make it ideal for limited-space applications and lighter axial loading.
The NT-18 is matched with WT series lockwashers: a washer tab seats into one of the locknut's many slots to provide accurate angular positioning and prevent loosening from vibration, shock, and torque. Machined from carbon steel, it installs without special tools on both soft and hardened shafts and meets and exceeds ANSI / ABMA 8.2-1999.
Key features
- Manufactured from carbon steel
- Small-profile design with smaller diameter and thickness for limited-space applications
- Matched with WT series lockwashers to lock and retain bearings and power transmission assemblies
- Numerous locking positions for accurate angular positioning
- Prevents assembly loosening from vibration, shock, and torque
- Meets and exceeds ANSI / ABMA 8.2-1999 specification
- Maximum operating temperature of 300 degrees F
- Effective on both soft and hardened shafts; no special tools required for installation
- Made in USA and RoHS compliant
Specifications
Whittet-Higgins NT-18 dimensions & specifications
- PDFNT-18 part print (opens in a new tab)
- STEP3D CAD model (opens in a new tab)
- PDFNT series spec sheet (opens in a new tab)
Files from Whittet-Higgins. They open in a new tab.
- Type
- Locknut
- Thread T
- 3.527-12 (89.59 mm, 12 threads per inch)
- Outside diameter (max.) D
- 4.312 in (109.52 mm)
- Face diameter (max.) F
- 4.000 in (101.60 mm)
- Width (max.) B
- 0.385 in (9.78 mm)
- Theoretical axial load
- 50,100 lbf (222.9 kN)
- Material
- Carbon Steel
- Country of origin
- USA
- Series
- Locknut NT series (small profile)
- Standard
- ANSI/ABMA 8.2-1999 meets and exceeds
- Weight
- 0.44 lb
- Brand
- Whittet-Higgins
- Part number
- NT-18 also written NT18
- UPC / EAN
- 751968561804
Use it with
Parts and tools for your NT-18
What Whittet-Higgins pairs with the NT-18. Tick what you need and add it with one click.
Same size, other versions
Other versions of the NT-18
The same size in other Whittet-Higgins series: left-hand thread, stainless steel, high strength, precision or self-locking designs.
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$42.89
In stock
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$128.65
In stock
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Whittet-Higgins
NL-18Whittet Higgins NL-18 Locknut
Locknut NL series (left-handed) · left-hand thread
$77.28
In stock
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$245.68
In stock
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$86.53
In stock
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Whittet-Higgins
BHL-18Whittet Higgins BHL-18 Bearhug Left Handed Retaining Nut
Bearhug BHL series (left-handed) · left-hand thread
$129.55
In stock
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Whittet-Higgins
BHM-18Whittet Higgins BHM-18 Bearhug Retaining Nut Hardened Alloy - High Strength
Bearhug BHM series (high strength)
$254.06
In stock
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Whittet-Higgins
BHS-18Whittet Higgins BHS-18 Bearhug Retaining Nut - Stainless
Bearhug BHS series (stainless)
$346.20
In stock
Part number explained
What every part of NT-18 means
- NT
- Locknut, Locknut NT series (small profile)
- 18
- Size 18: 3.527-12 thread
Catalogs & documents
Whittet-Higgins NT-18 catalogs & documents
Official catalogs and data from the manufacturer. They open as PDFs in a new tab.
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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
NT-18 questions & answers
What size is the Whittet-Higgins NT-18?
The Whittet-Higgins NT-18 is a locknut. Thread: 3.527-12 (89.59 mm, 12 threads per inch). Outside diameter: 4.312 in (109.52 mm). Face diameter: 4.000 in (101.60 mm). Width: 0.385 in (9.78 mm). These are Whittet-Higgins' maximum sizes from its spec sheet.
What thread does the NT-18 fit?
The Whittet-Higgins NT-18 fits a 3.527-12 right-hand shaft thread (89.59 mm, 12 threads per inch).
Does the NT-18 need a lockwasher?
Yes. Whittet-Higgins matches the NT-18 with the WT-18 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 temperature can the NT-18 take?
Whittet-Higgins rates the Locknut NT series (small profile) for up to 300 °F (149 °C).
What is the NT-18 made of?
Locknut: carbon steel.
Is there a drawing or CAD model of the NT-18?
Yes. Whittet-Higgins publishes a part print (PDF) and a 3D CAD model (STEP) for the NT-18. The drawing on this page is made from the same catalog dimensions.
How do I install the NT-18?
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 NT-18 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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