6" Conversion Ruler - Metric to Imperial - Part #3940
6" Conversion Ruler - Metric to Imperial - Part #3940 is backordered and will ship as soon as it is back in stock.
Free Shipping on USA orders over $45
Free Shipping on USA orders over $45
Fast, reliable shipping for sewing machine parts and accessories
At Central Michigan Sewing Supplies, we work hard to get your orders packed and shipped quickly. Most products are stocked at our Florida location and ready for shipment.
Order Processing
Orders are typically processed and shipped within 1–2 business days, excluding weekends and holidays. Many orders ship the same business day.
Orders placed on weekends or holidays are generally processed on the next business day.
United States Shipping Rates
We offer several shipping options at checkout so you can choose the service that best meets your needs.
| Shipping Method | Cost | Estimated Transit Time |
|---|---|---|
| Economy Shipping | $6.25 on orders under $45 | Varies by carrier and destination |
| Free Economy Shipping | FREE on orders $45 or more | Varies by carrier and destination |
| USPS Ground Advantage | $8.99 | 3–5 business days |
| USPS Priority Mail | $11.99 | 2–3 business days |
| USPS Priority Mail Express | $34.99 | 1–2 business days |
Free Economy Shipping is available on U.S. orders of $45 or more, including APO/FPO addresses. Eligibility is based on the merchandise subtotal after discounts and before taxes and shipping charges.
Customers who qualify for free shipping may still choose a paid shipping service at checkout.
Economy Shipping
For Economy Shipping and Free Economy Shipping, we select the shipping carrier and service based on the package size, weight, destination, and available shipping options.
Orders may ship via USPS, UPS, or FedEx. All shipments include tracking.
Economy Shipping is not necessarily slower than our paid shipping options. Many Economy orders ship via USPS Ground Advantage.
Expedited Shipping
Customers who prefer a specific USPS service can select USPS Ground Advantage, Priority Mail, or Priority Mail Express at checkout.
USPS Priority Mail Express is available on eligible lightweight orders weighing up to one pound. Availability may vary depending on the items ordered.
Delivery times shown are estimates provided for the shipping service and are not guaranteed. Processing time is separate from carrier transit time.
Tracking Your Order
Once your order ships, you'll receive a shipping confirmation with tracking information.
You can follow your shipment using the tracking link in your confirmation email or through your order details.
International Shipping
We currently ship internationally to Canada, Australia, and New Zealand.
International shipping rates are calculated at checkout based on the destination, package weight, and available shipping services.
Orders are typically processed within 1–2 business days.
International deliveries generally take approximately 7–14 business days, although delivery may take up to 30 days or longer in some circumstances, particularly for remote destinations or customs delays.
Customs, Duties, and Import Taxes
International customers are responsible for any applicable customs duties, import taxes, or other fees charged by their country, unless otherwise indicated at checkout.
Customs processing and carrier delays are outside our control.
APO/FPO Shipping
We ship to APO/FPO addresses using eligible USPS services. Free Economy Shipping is available on qualifying U.S. orders of $45 or more.
Delivery times to military addresses may be longer than standard domestic estimates.
Shipping Delays
While we make every effort to ship orders promptly, delivery estimates may be affected by weather, holidays, carrier disruptions, customs processing, or other circumstances beyond our control.
If you have questions about an order or shipment, please contact us.
Contact Us
Central Michigan Sewing Supplies
838 S. Tamiami Trail
Osprey, FL 34229
Email: chris@vintagesingerparts.com
Phone: (941) 441-8193
Customer service phone hours: Monday–Friday, 9:00 AM–5:00 PM Eastern Time.
We appreciate your business and take pride in carefully packing and shipping your sewing machine parts and accessories.
Description
Description
6" Conversion Ruler - Metric to Imperial Measuring Tool
Part Number: 3940
Type: Generic
Dimensions: 6 inches long x ¾ inch wide (150mm x 19mm)
Material: Rigid stainless steel
Graduations: Dual-scale - Inches (1/32" and 1/16") on one side, Metric on the other
Overview:
The Conversion Ruler (Part Number: 3940) is a rigid stainless steel measuring tool used in industrial and domestic sewing for quick unit conversions. This essential tool features etched markings for converting millimeters to inches and inches to millimeters, making it perfect for anyone who works with patterns and specifications from different countries. No more hunting for conversion charts or doing mental math - just flip the ruler over for instant reference.
Key Features and Specifications:
Dual-Scale Graduations for Instant Conversion:
This ruler displays measurements in inches down to 1/32" and 1/16" increments on one side, with a metric scale on the other for instant reference. Whether you're following a European pattern in millimeters or working with American specifications in inches, you can quickly verify measurements in either system without reaching for a calculator.
Rigid Stainless Steel Construction:
Made from rigid stainless steel, this ruler is resistant to rust and wear from frequent use in sewing and embroidery workshops. Unlike flexible rulers, the rigid design provides a stable straight edge for marking and drafting. The stainless steel construction ensures the etched markings remain legible through years of professional use.
Compact Pocket Ruler Design:
At 6 inches long by ¾ inch wide (150mm x 19mm), this ruler is perfectly sized as a "pocket ruler." It's small enough to be kept at your sewing workstation or carried in a technician's kit, yet wide enough to provide a stable straight edge for marking patterns and checking seam tolerances.
Etched Markings for Durability:
The graduations are etched into the stainless steel, not printed on the surface. This means the markings are permanent and won't wear off, even with frequent use in professional environments. You can count on clear, legible measurements for years to come.
Precision and Durability:
Designed for precision and durability in professional environments, this ruler delivers accurate measurements every time. The rigid construction ensures it won't flex or bend during use, providing consistent, reliable measurements for critical sewing and embroidery work.
Common Applications:
Unit Conversion: Used by tailors and embroidery technicians when following patterns that use mixed measurement systems. For example, European patterns often specify measurements in millimeters, while American sewing machines and patterns use inches. This ruler bridges that gap instantly.
Seam Checking: Ideal for verifying small, precise seam allowances or checking stitch lengths. The dual scales let you verify measurements in whichever system your pattern or machine uses.
Pattern Drafting: Acts as a straight edge for small-scale marking and garment alterations. The rigid construction provides a stable edge for drawing accurate lines on pattern paper or fabric.
International Pattern Work: Perfect for sewers who work with patterns from multiple countries or who sell to international markets. No more confusion about whether that measurement is in inches or centimeters.
Who Uses This Tool:
Professional tailors working with international patterns, embroidery technicians following mixed-unit specifications, pattern makers and drafters, alterations specialists, sewing machine technicians, and home sewers who use patterns from multiple countries.
Why Choose the 3940 Conversion Ruler?
When you work with patterns and specifications that use different measurement systems, the 3940 Conversion Ruler is an indispensable tool. The combination of dual-scale graduations, rigid stainless steel construction, and compact size makes this ruler perfect for professional sewing environments. At this price point, it's an affordable solution to the constant challenge of converting between metric and imperial measurements.
Professional Tip: Keep this ruler at your cutting table or sewing station for quick reference when working with international patterns. The instant conversion capability saves time and eliminates measurement errors that can occur when doing mental conversions.
Specifications
Specifications
-
Brand
-
Condition
Payment & Security
Payment methods
Your payment information is processed securely. We do not store credit card details nor have access to your credit card information.


