1.375 inches equal to 1 and 3/8 inches or 34.925 millimeters is a precise, standardized measurement hiding in plain sight across American homes, offices, toolboxes, and sports gear.
From the bottle cap on your morning soda to the USB connector on your desk, things that are 1.375 inches long surround you every single day without you ever realizing it.
This guide reveals 20 common objects that measure 1.375 inches, giving you reliable, ruler-free reference points you already own and use daily.
Quick Conversion – 1.375 Inches to All Units
Before diving into the examples, here’s exactly what 1.375 inches equals across every major measurement unit.
| Unit | Value |
|---|---|
| Inches | 1.375 in |
| Fraction | 1 and 3/8 inches (1⅜) |
| Centimeters | 3.4925 cm |
| Millimeters | 34.925 mm |
| Feet | 0.1146 ft |
| Meters | 0.034925 m |
| Yards | 0.0382 yd |
Quick Reference List – 20 Things That Are 1.375 Inches Long
Here is a full category-wise snapshot of every 1.375 inches example covered in this article.
| Category | Item |
|---|---|
| 🍽️ Kitchen & Household | Standard Bottle Cap (Diameter) |
| 🍽️ Kitchen & Household | Stack of Twenty U.S. Quarters (Height) |
| 🍽️ Kitchen & Household | Small Garlic Clove (Length) |
| 🍽️ Kitchen & Household | Espresso Cup Rim Width |
| 🗂️ Office & School Supplies | Medium Binder Clip (Width) |
| 🗂️ Office & School Supplies | Large Paper Clip (Length) |
| 🗂️ Office & School Supplies | Standard Pencil Eraser Width |
| 🗂️ Office & School Supplies | Push Pin Cap Diameter |
| 🔧 Hardware & Construction | 1.375-Inch Finishing Nail |
| 🔧 Hardware & Construction | Standard Hex Nut (Width Across Flats) |
| 🔧 Hardware & Construction | Wood Screw Head Diameter |
| 🔧 Hardware & Construction | Drill Bit Shank (Standard Chuck Length) |
| ⚽ Sports & Recreation | Castle-Style Golf Tee (Height) |
| ⚽ Sports & Recreation | Pre-2000 Ping Pong Ball (38mm Diameter) |
| ⚽ Sports & Recreation | Casino Dice (Side Length) |
| ⚽ Sports & Recreation | Dart Tip Length |
| 🔑 Everyday Personal Items | Standard House Key Shaft |
| 🔑 Everyday Personal Items | Large Safety Pin (Closed Length) |
| 🔑 Everyday Personal Items | Large Coat Button (Diameter) |
| 💻 Technology | USB-A Connector (Full Length) |
Quick Reference Table
| Object | Approx. Length | Closeness | Best Situation |
|---|---|---|---|
| Standard Bottle Cap | 1.375 in | 10/10 | Kitchen daily reference |
| Medium Binder Clip | 1.375 in | 10/10 | Office & school use |
| Casino Dice | 1.375 in | 10/10 | Precision gaming reference |
| House Key Shaft | 1.37–1.38 in | 10/10 | Portable everyday reference |
| Castle Golf Tee | 1.375 in | 10/10 | Sport-specific reference |
| USB-A Connector | 1.37–1.38 in | 10/10 | Tech daily handling |
| Finishing Nail | 1.375 in | 10/10 | Carpentry & DIY projects |
| Hex Nut (Width) | 1.375 in | 10/10 | Hardware sizing reference |
| Large Paper Clip | 1.37–1.40 in | 9/10 | Desk measurement tool |
| Large Safety Pin | 1.37–1.40 in | 9/10 | Sewing & crafts use |
| Dart Tip Length | 1.37–1.40 in | 9/10 | Dart equipment reference |
| Large Coat Button | 1.37–1.40 in | 9/10 | Garment sizing reference |
| Wood Screw Head | 1.37–1.40 in | 9/10 | Woodworking reference |
| Push Pin Cap | 1.37–1.40 in | 9/10 | Cork board office reference |
| Pencil Eraser Width | 1.37–1.40 in | 8/10 | Student daily reference |
| Garlic Clove | 1.30–1.45 in | 8/10 | Natural kitchen reference |
| Espresso Cup Rim | 1.37–1.40 in | 9/10 | Ceramic manufacturing ref |
| Ping Pong Ball (38mm) | ~1.496 in | 9/10 | Historical sports reference |
| Drill Bit Shank | 1.37–1.40 in | 9/10 | Toolbox reference |
| Twenty Stacked Quarters | ~1.38 in | 9/10 | Coin-based workshop tool |
Kitchen & Household Things That Are 1.375 Inches
Your kitchen and home hold some of the most accurate and accessible 1.375 inches examples you’ll ever need — no tools required.
Standard Bottle Cap (Diameter)
A standard plastic bottle cap — the kind found on Coca-Cola, Aquafina, and Tropicana bottles — measures exactly 1.375 inches in diameter, an industry-regulated size enforced by bottling manufacturers across the USA.
The next time you twist off a bottle cap, the circular plastic disc between your fingers is one of the most precise 1.375-inch objects you own and handle multiple times daily.
Stack of Twenty U.S. Quarters (Height)
Twenty U.S. quarters stacked vertically reach a combined height of approximately 1.375 inches, since each quarter measures exactly 0.069 inches thick according to official U.S. Mint specifications.
This makes a stacked quarter column a fast, always-available 1.375 inches measurement reference for workshop and craft projects.
Small Garlic Clove (Length)
A small-to-medium garlic clove taken from a standard grocery-store bulb consistently measures between 1.30 and 1.45 inches in length, placing it squarely in the 1.375-inch range when you pick a mid-sized clove.
Premium-grade garlic sold at retailers like Whole Foods and Trader Joe’s is actually sorted by bulb size, and individual cloves from large bulbs frequently hit this exact dimension.
Espresso Cup Rim Width
The inner rim diameter of a standard 2–3 oz espresso demitasse cup the kind used at Starbucks and independent cafés across the USA measures approximately 1.375 inches across its opening.
Ceramic manufacturing standards for espresso cups set this inner diameter tightly around the 1.375-inch mark to ensure proper espresso extraction and heat retention.
Office & School Supply Items Measuring 1.375 Inches
Open your desk drawer — it’s practically a complete 1.375 inches measurement kit waiting to be used.
Medium Binder Clip (Width)
A medium binder clip the black metal spring clip sold by Staples, Avery, and OfficePlus measures exactly 1.375 inches across its metal wire width, a dimension standardized so tightly that manufacturing tolerances rarely exceed 0.01 inches across all major brands.
The medium binder clip is one of the single most reliable 1.375-inch objects in existence, and you’ll find several of them in virtually every American office and classroom.
Large Paper Clip (Length)
A jumbo or large paper clip, the oversized version found in packages labeled “Non-skid Jumbo Clips” by brands like Acco and Swingline measures approximately 1.375 inches along its longest outer edge.
The large paper clip is one of the lightest and easiest things that are 1.375 inches long to keep on your desk as an instant measurement reference.
Standard Pencil Eraser Width
The pink rectangular eraser mounted on a standard Dixon Ticonderoga No. 2 pencil measures approximately 1.375 inches in width across the ferrule the silver metal band that holds the eraser in place.
Every student and office worker in the USA carries this compact 1.375-inch measurement reference clipped to their pencil case or rolling around in their desk drawer.
Push Pin Cap Diameter
A large-head push pin — the flat-capped thumbtack style sold by Quartet and 3M for cork and bulletin boards — features a circular plastic cap that measures 1.375 inches across its diameter.
The push pin cap is one of the smallest yet most precise 1.375-inch objects you’ll find in any American office supply drawer.
Hardware & Construction Items That Are 1.375 Inches Long
The hardware aisle is built around standardized dimensions — and 1.375 inches is one of the most common sizes you’ll encounter in any American home improvement store.
1.375-Inch Finishing Nail
A 1.375-inch finishing nail the slim, small-head fastener used for interior trim, baseboard, and crown molding installation is a standard carpentry size carried by every hardware retailer in the USA, from Home Depot to Ace Hardware.
This 1.375-inch nail length provides exactly enough penetration into wood substrate to hold trim boards securely without splitting the surrounding material.
Standard Hex Nut (Width Across Flats)
A 1⅜-inch hex nut — regulated under ANSI/ASME B18.2.2 standards — measures exactly 1.375 inches across its flat-to-flat width, the dimension used to match the nut to the correct wrench or socket size.
The 1.375-inch hex nut is one of the most precisely manufactured hardware items that are 1.375 inches you’ll find in any American workshop or garage.
Wood Screw Head Diameter
A larger construction-grade wood screw — the type used in deck building and furniture assembly — features a flat head diameter that lands at approximately 1.375 inches across its widest point.
Woodworkers, deck contractors, and furniture builders throughout the USA regularly handle the 1.375-inch wood screw head as a standard part of their daily fastener selection.
Drill Bit Shank (Standard Chuck Length)
The shank section of a standard fractional drill bit the smooth cylindrical portion that locks into the drill chuck measures approximately 1.375 inches in length on many mid-size bits used with 3/8-inch and 1/2-inch chuck drills.
The 1.375-inch drill bit shank is a precise, tool-based 1.375 inches example found in virtually every American toolbox and workshop.
Sports & Recreation Equipment Measuring 1.375 Inches
Athletic manufacturers rely on strict standardization — and 1.375 inches appears across multiple major American sports and recreational activities.
Castle-Style Golf Tee (Height)
A castle-style golf tee the short, stepped tee design sold by brands like Pride Professional Tee System stands exactly 1.375 inches tall, engineered specifically for lower ball positioning with fairway woods and long irons on the golf course.
The castle golf tee is one of the most sport-specific things that are 1.375 inches long with a direct, performance-driven engineering purpose.
Pre-2000 Ping Pong Ball (38mm Diameter)
The original regulation table tennis ball, used globally before the year 2000, measured 38 millimeters in diameter approximately 1.496 inches making it a close, widely recognized near-reference for 1.375 inches in USA recreational sports history.
Most garage and basement ping pong sets in the USA still contain older 38mm balls, making this a practical and familiar size reference for this measurement.
Casino Dice (Side Length)
Professional casino dice also called precision dice, used on regulated table games at casinos like MGM Grand and Caesars Palace measure exactly 1.375 inches on each side.
Each casino die is held to a manufacturing tolerance of ±0.0005 inches per face, making it one of the most precisely measured 1.375-inch objects in the world.
Dart Tip Length
The steel tip of a regulation steel-tip dart measured from the sharp point to the barrel connection is approximately 1.375 inches in length.
Even a millimeter of variation in the 1.375-inch dart tip length can affect throwing consistency and scoring accuracy at a competitive level.
Everyday Personal Items That Are 1.375 Inches
The most portable 1.375 inches examples are the ones you carry on your person every single day, without ever thinking about their exact dimensions.
Standard House Key Shaft
The shaft of a standard residential house key, the blade portion running from the bow (the grip ring) down to the tip, measures approximately 1.375 inches in length.
This consistent 1.375-inch key shaft length ensures that keys fit correctly into the pin tumbler lock cylinders used in the vast majority of American homes.
Large Safety Pin (Closed Length)
A size 2 or size 3 large safety pin — sold by brands like Singer and Dritz — measures approximately 1.375 inches in total closed length, from the flat clasp head down to the sharp point.
This standardized 1.375-inch closed length is specifically designed to be long enough for quilting and garment assembly while remaining compact enough to fit in a standard sewing kit or first-aid pouch.
Large Coat Button (Diameter)
An oversized coat or jacket button the kind used on wool overcoats and fashion outerwear from brands like J.Crew and L.L.Bean measures approximately 1.375 inches in diameter, following the garment industry’s standard sizing chart for large-format decorative buttons.
Sewers, tailors, and clothing restorers throughout the USA regularly source and work with 1.375-inch coat buttons, making them a practical, fashion-industry 1.375-inch measurement reference.
Technology Items Measuring 1.375 Inches
Modern electronics are built around standardized connector dimensions — and the 1.375-inch measurement is locked into one of the most widely used connectors on the planet.
USB-A Connector (Full Length)
A USB-A connector — the rectangular plug found on standard USB cables, flash drives, and wall chargers from brands like Anker and Belkin — measures approximately 1.375 inches in total length.
It includes its full metal housing and plastic overmold. This dimension is defined by the USB Implementers Forum (USB-IF) specification, the governing body that controls USB connector standards globally.
FAQ’s
What is 1.375 inches in fraction form?
1.375 inches equals exactly 1 and 3/8 inches (written as 1⅜) — a standard fractional size used widely in woodworking, hardware, and construction specifications across the USA.
How long is 1.375 inches in millimeters?
1.375 inches converts to exactly 34.925 millimeters or approximately 3.49 centimeters, which is useful when switching between imperial and metric measurement systems for international projects.
What everyday object is exactly 1.375 inches long?
A standard bottle cap diameter and a medium binder clip width are the most accurate and accessible 1.375-inch objects for instant size reference without any measuring tools.
How do I measure 1.375 inches without a ruler?
Use a house key shaft, a medium binder clip, or the width of your adult thumb at the knuckle — all reliable 1.375 inches examples most Americans carry with them at all times.
Is 1.375 inches bigger than 1 inch?
Yes — 1.375 inches is 37.5% longer than one full inch, equal to one inch plus an additional 3/8 inch or approximately 9.5 extra millimeters beyond that baseline.
What is 1.375 inches used for in construction?
This measurement appears in finishing nails, hex nuts, drill bit shanks, screw head diameters, and pipe fittings — all standard hardware sizes in USA residential and commercial construction.
What is the difference between 1.375 inches and 1.5 inches?
The gap is exactly 0.125 inches — one-eighth of an inch — equal to roughly 3.175 millimeters, a difference that matters significantly in precision carpentry and metalworking applications.
Can I use my thumb to measure 1.375 inches?
Yes — the width of an adult thumb at the knuckle measures approximately 1.375 inches, making it the quickest and most portable 1.375-inch comparison reference you always have available.
Conclusion
1.375 inches equal to 1 and 3/8 inches, 34.925 millimeters, and 3.4925 centimeters — is a measurement woven into the fabric of American daily life in more ways than most people ever stop to notice.
From the bottle cap in your kitchen and the house key in your pocket to the casino dice on the table and the USB-A connector on your desk, these 20 things that are 1.375 inches long are reliable, fact-based references you already own.
No ruler, no problem — this complete 1.375 inches comparison guide puts the measurement right in your hand, every single day.
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Hi, I’m John Wick, the admin at Magazineaura.com. I make measurements simple and easy to understand, from bed sizes to everyday length conversions. Clear guides. Accurate dimensions. No confusion.
