Whittet Higgins PT-13 Precision Retaining Nut - Small Profile, Space-Saving Design
- T 2.548-18
- D 3.125″
- B 0.354″
Genuine Whittet-Higgins product, Whittet-Higgins
- Regular price
- $24.00
- Sale price
- $24.00
- Regular price
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Quantity pricingApplied at checkout
- 20–49 5% off$22.80 ea
- 50–99 8% off$22.08 ea
- 100–199 15% off$20.40 ea
- 200–499 18% off$19.68 ea
- 500+ 25% off$18.00 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 PT-13
$24.00
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 PT-13 Locknut
The Whittet-Higgins PT-13 is a small-profile precision locknut engineered for lighter axial-loading precision applications where space is limited. Its reduced outside diameter and thickness fit tight envelopes while delivering the most precise basic light-duty adjustment and setting available, with double the locking positions of an NT locknut for tighter, more repeatable bearing and power-transmission assembly setup.
The PT-13 is matched with PWT and PWTF series lockwashers, whose bent tab engages the nut to secure, lock, and retain bearings and power transmission components against loosening from vibration, shock, and torque. Machined from carbon steel and effective on both soft and hardened shafts, it installs with no special tools. Manufactured in the USA and RoHS compliant, it meets and exceeds the ANSI/ABMA 8.2-1999 specification.
Key features
- Carbon steel construction
- Small-profile, light-duty precision locknut with reduced diameter and thickness for limited spaces
- Twice the locking positions of an NT locknut for tighter, more precise adjustment
- Locked and retained by matching PWT and PWTF series lockwashers
- Resists loosening from vibration, shock, and torque
- Effective on both soft and hardened shafts
- Installs with no special tools required
- Maximum operating temperature 300 degrees F
- Made in USA, RoHS compliant; meets and exceeds ANSI/ABMA 8.2-1999
Specifications
Whittet-Higgins PT-13 dimensions & specifications
- PDFPT-13 part print (opens in a new tab)
- STEP3D CAD model (opens in a new tab)
- PDFPT series spec sheet (opens in a new tab)
Files from Whittet-Higgins. They open in a new tab.
- Type
- Precision locknut
- Thread T
- 2.548-18 (64.72 mm, 18 threads per inch)
- Outside diameter (max.) D
- 3.125 in (79.38 mm)
- Face diameter (max.) F
- 2.875 in (73.02 mm)
- Width (max.) B
- 0.354 in (8.99 mm)
- Theoretical axial load
- 42,200 lbf (187.7 kN)
- Material
- Carbon Steel
- Country of origin
- USA
- Series
- Precision locknut PT series (small profile)
- Standard
- ANSI/ABMA 8.2-1999 meets and exceeds
- Weight
- 0.24 lb
- Brand
- Whittet-Higgins
- Part number
- PT-13 also written PT13
- UPC / EAN
- 751968441304
Use it with
Parts and tools for your PT-13
What Whittet-Higgins pairs with the PT-13. Tick what you need and add it with one click.
Same size, other versions
Other versions of the PT-13
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
PL-13Whittet Higgins PL-13 Precision Retaining Nut - Left Handed Threads
Precision locknut PL series (left-handed) · left-hand thread
$44.31
In stock
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Whittet-Higgins
PN-13Whittet Higgins PN-13 Precision Retaining Nut - Standard Threads
Precision locknut PN series (inch)
$24.55
In stock
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$31.92
In stock
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Whittet-Higgins
BHL-13Whittet Higgins BHL-13 Bearhug Left Handed Retaining Nut
Bearhug BHL series (left-handed) · left-hand thread
$57.05
In stock
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Whittet-Higgins
BHM-13Whittet Higgins BHM-13 Bearhug Retaining Nut Hardened Alloy - High Strength
Bearhug BHM series (high strength)
$76.29
In stock
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Whittet-Higgins
BHS-13Whittet Higgins BHS-13 Bearhug Retaining Nut - Stainless
Bearhug BHS series (stainless)
$103.59
In stock
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Whittet-Higgins
BHT-13Whittet Higgins BHT-13 Bearhug Locknut, All Steel
Bearhug BHT series (heat resistant)
$64.03
In stock
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$138.23
In stock
Part number explained
What every part of PT-13 means
- PT
- Precision locknut, Precision locknut PT series (small profile)
- 13
- Size 13: 2.548-18 thread
Catalogs & documents
Whittet-Higgins PT-13 catalogs & documents
Official catalogs and data from the manufacturer. They open as PDFs in a new tab.
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Product document
Catalog PT Series – Space Saving (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
PT-13 questions & answers
What size is the Whittet-Higgins PT-13?
The Whittet-Higgins PT-13 is a precision locknut. Thread: 2.548-18 (64.72 mm, 18 threads per inch). Outside diameter: 3.125 in (79.38 mm). Face diameter: 2.875 in (73.02 mm). Width: 0.354 in (8.99 mm). These are Whittet-Higgins' maximum sizes from its spec sheet.
What thread does the PT-13 fit?
The Whittet-Higgins PT-13 fits a 2.548-18 right-hand shaft thread (64.72 mm, 18 threads per inch).
Does the PT-13 need a lockwasher?
Yes. Whittet-Higgins matches the PT-13 with the PWT-13 or PWTF-13 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 PT-13 take?
Whittet-Higgins rates the Precision locknut PT series (small profile) for up to 300 °F (149 °C).
What is the PT-13 made of?
Locknut: carbon steel.
Is there a drawing or CAD model of the PT-13?
Yes. Whittet-Higgins publishes a part print (PDF) and a 3D CAD model (STEP) for the PT-13. The drawing on this page is made from the same catalog dimensions.
How do I install the PT-13?
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 PT-13 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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