Collection: Master Support Laps
Professional aluminum master support laps and screwback master laps designed for gemstone faceting machines and flat lap systems. Available in 6" and 8" diameters in 1/2" flat aluminum master plate formats and 1/4"-20 screwback configurations in both right-hand and left-hand thread patterns. These precision-machined aluminum plates provide an ultra-flat, rigid backing foundation for thin diamond faceting laps, lapping film discs, and polishing pads, eliminating lap flex and ensuring razor-sharp facet meetpoints.
Available Products and Pricing
| Product |
Diameter & Thickness |
Spindle / Thread Type |
Price |
| Aluminum Master Support Lap |
6" x 1/2" |
1/2" flat arbor |
$20.00 |
| Aluminum Master Support Lap |
8" x 1/2" |
1/2" flat arbor |
$28.00 |
| Screwback Master Support Lap |
6" |
1/4"-20 Right-Hand Thread |
$24.00 |
| Screwback Master Support Lap |
6" |
1/4"-20 Left-Hand Thread |
$24.00 |
| Screwback Master Support Lap |
8" |
1/4"-20 Right-Hand Thread |
$34.00 |
| Screwback Master Support Lap |
8" |
1/4"-20 Left-Hand Thread |
$34.00 |
Key Features
- Precision CNC-machined flat aluminum surface for true, vibration-free lap rotation
- 1/2" flat master lap design supports magnetic toppers, PSA films, and thin diamond discs
- 1/4"-20 screwback design in right-hand and left-hand threads for direct spindle mounting
- Standard 6" and 8" diameters compatible with Ultra Tec, Facetron, Graves, and custom faceting machines
- Resists deflection and warping under grinding pressure for exacting faceting geometry
Related Tools
Frequently Asked Questions
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Q: What is the difference between a 1/2" aluminum master lap and a 1/4"-20 screwback lap?
A: The 1/2" aluminum master lap is a flat disk with a 1/2" center hole, placed directly onto a machine platen and secured with a standard nut or washer. The 1/4"-20 screwback lap features an integral female threaded boss on the reverse side that screws directly onto the machine spindle, providing maximum top-surface clearance for faceting dop arms.
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Q: How do I determine whether my machine uses right-hand or left-hand thread?
A: Spindle rotation determines thread direction. If the spindle turns clockwise, a left-hand thread is typically used to prevent the lap from loosening during operation; if counterclockwise, a right-hand thread is used. Most standard US faceting machines (such as Ultra Tec and Facetron) use 1/4"-20 right-hand thread. Verify your machine specifications before ordering.
