Whittet Higgins PL-20 Precision Retaining Nut - Left Handed Threads
- T 3.918-12
- D 5.188″
- B 0.760″
- Left-hand thread
Genuine Whittet-Higgins product, Whittet-Higgins
- Regular price
- $135.37
- Sale price
- $135.37
- Regular price
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Quantity pricingApplied at checkout
- 20–49 5% off$128.60 ea
- 50–99 8% off$124.54 ea
- 100–199 15% off$115.06 ea
- 200–499 18% off$111.00 ea
- 500+ 25% off$101.53 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 PL-20
$135.37
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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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 PL-20 Locknut
The Whittet-Higgins PL series is a left-hand thread precision bearing locknut machined from carbon steel for securing, locking, and retaining bearings and power transmission components on a threaded shaft or sleeve. The left-hand thread keeps clockwise-rotating assemblies from backing off, while the locknut provides double the locking positions of a standard NL locknut for finer, more accurate adjustment. It is used together with the matching PW series keyed lockwasher, whose tab engages a notch in the nut to positively prevent loosening from vibration, shock, and torque. The PL locknut meets and exceeds the ANSI/ABMA 8.2-1999 specification and installs without special tools on both soft and hardened shafts.
Key features
- Machined carbon steel construction
- Left-hand thread prevents clockwise-rotating assemblies from loosening
- Double the locking positions of an NL locknut for finer adjustment
- Locks with the matching PW series lockwasher tab
- Meets and exceeds ANSI/ABMA 8.2-1999 specification
- Maximum operating temperature 300 degrees F
- Effective on soft and hardened shafts
- No special tools required for installation
- Manufactured in the USA and RoHS compliant
Specifications
Whittet-Higgins PL-20 dimensions & specifications
- PDFPL-20 part print (opens in a new tab)
- STEP3D CAD model (opens in a new tab)
- PDFPL series spec sheet (opens in a new tab)
Files from Whittet-Higgins. They open in a new tab.
- Type
- Precision locknut
- Thread T
- 3.918-12 (99.52 mm, 12 threads per inch)
- Outside diameter (max.) D
- 5.188 in (131.78 mm)
- Face diameter (max.) F
- 4.813 in (122.25 mm)
- Width (max.) B
- 0.760 in (19.30 mm)
- Theoretical axial load
- 159,800 lbf (710.8 kN)
- Material
- Carbon Steel
- Country of origin
- USA
- Thread direction
- Left-hand
- Series
- Precision locknut PL series (left-handed)
- Standard
- ANSI/ABMA 8.2-1999 meets and exceeds
- Weight
- 1.72 lb
- Brand
- Whittet-Higgins
- Part number
- PL-20 also written PL20
- UPC / EAN
- 751968412007
Use it with
Parts and tools for your PL-20
What Whittet-Higgins pairs with the PL-20. Tick what you need and add it with one click.
Same size, other versions
Other versions of the PL-20
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
PN-20Whittet Higgins PN-20 Precision Retaining Nut - Standard Threads
Precision locknut PN series (inch)
$68.64
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$53.46
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$124.01
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Whittet-Higgins
BHL-20Whittet Higgins BHL-20 Bearhug Left Handed Retaining Nut
Bearhug BHL series (left-handed)
$178.48
In stock
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Whittet-Higgins
BHM-20Whittet Higgins BHM-20 Bearhug Retaining Nut Hardened Alloy - High Strength
Bearhug BHM series (high strength)
$260.91
In stock
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Whittet-Higgins
BHS-20Whittet Higgins BHS-20 Bearhug Retaining Nut - Stainless
Bearhug BHS series (stainless)
$481.38
In stock
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$297.12
In stock
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$132.41
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Part number explained
What every part of PL-20 means
- PL
- Precision locknut, Precision locknut PL series (left-handed)
- 20
- Size 20: 3.918-12 thread
Catalogs & documents
Whittet-Higgins PL-20 catalogs & documents
Official catalogs and data from the manufacturer. They open as PDFs in a new tab.
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Product document
Catalog Precision Locknut – PL Series (Left-Handed) (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
PL-20 questions & answers
What size is the Whittet-Higgins PL-20?
The Whittet-Higgins PL-20 is a precision locknut. Thread: 3.918-12 (99.52 mm, 12 threads per inch). Outside diameter: 5.188 in (131.78 mm). Face diameter: 4.813 in (122.25 mm). Width: 0.760 in (19.30 mm). These are Whittet-Higgins' maximum sizes from its spec sheet.
What thread does the PL-20 fit?
The Whittet-Higgins PL-20 fits a 3.918-12 left-hand shaft thread (99.52 mm, 12 threads per inch). A left-hand thread keeps the nut from working loose where the shaft's rotation would loosen a right-hand nut.
Does the PL-20 need a lockwasher?
Yes. Whittet-Higgins matches the PL-20 with the PW-20 or PWF-20 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 PL-20?
Whittet-Higgins' BAS-20 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 RTD-20 rethreading die.
What temperature can the PL-20 take?
Whittet-Higgins rates the Precision locknut PL series (left-handed) for up to 300 °F (149 °C).
What is the PL-20 made of?
Locknut: carbon steel.
Is there a drawing or CAD model of the PL-20?
Yes. Whittet-Higgins publishes a part print (PDF) and a 3D CAD model (STEP) for the PL-20. The drawing on this page is made from the same catalog dimensions.
How do I install the PL-20?
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 PL-20 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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