The width of the strip
Measured across the flat face of the spring, in mm (0.80–1.70 in this series). It must fit the inside height of the barrel — this is the one measurement that has to match.
White-A-Loy Mainsprings — Order by Size
Shop white-alloy watch mainsprings by height, thickness and length. Every size is listed in both metric (mm) and Dennison gauge, so you can match the spring in the barrel or the number on the old packet. Filter to your measurement, set a quantity and add to cart — no scrolling through a flat list.
- 18 sizes from 0.80 mm to 1.70 mm height
- Metric + Dennison cross-reference on every row
- Free shipping on orders over $375 (up to 5 lbs)
Find your size
Showing 18 of 18 mainsprings
Tip: match height first (it must fit the barrel), then thickness, then the closest length.
White-A-Loy mainspring size chart
| Dennison H × T × L | Price | Qty | Add |
|---|
No White-A-Loy spring matches that exactly.
Try clearing the length filter — a slightly different length usually works if height and thickness match. Or email support@timeconnectioninc.com with your measurement.
Metric sizes are height × thickness × length in millimetres. Dennison gauge shown for cross-reference.
Sold [per piece / pack of N] · Wholesale accounts only
How to read a mainspring size
A mainspring is specified by three measurements. Here is what each one means so you order the right spring the first time.
The strength of the spring
The gauge of the steel, in mm (0.055–0.115 here). Thicker means more torque; too thick and the movement over-banks, too thin and it loses amplitude. Stay as close to original as you can.
Power reserve
Total uncoiled length in mm (200–380 in this series). Length sets how many turns the barrel holds; a small difference is usually acceptable when height and thickness match.
DENNISON GAUGEOlder American and British material houses sized springs with the Dennison gauge instead of millimetres. The Dennison column of the chart gives the equivalent (height × thickness × length) so you can order from the number printed on an old packet or in a parts book.
Ordering questions
Height × thickness × length. Height is the width of the strip and must match the inside of the barrel. Thickness sets the torque, and length sets how many turns the barrel stores. The chart gives each in millimetres with the Dennison gauge equivalent beside it.
Match height first, then thickness, then pick the nearest length — a small difference in length is usually acceptable. If height or thickness differ from the original, email support@timeconnectioninc.com with the caliber and we will check the fit before you order.
[Enter your packing: e.g. one spring per sealed packet with the MSS-WA number printed on it, and any case-quantity discount you offer.]
Time Connection II is a wholesale supplier, so prices show after you log in to a registered wholesale account. Registration is free for trade customers. Retail buyers can order the same parts at WatchPartsDepot.com.
