Precision
countersinking.
Flush-mount fastener holes machined directly into your sheet metal parts during production. 82° and 90° angles available on top or bottom side.
Countersink Angles
Choose the angle that matches your fastener specification
82° Countersink
The most common countersink angle. Standard for flat-head machine screws (ANSI/ASME B18.6.3). Use this when working with standard flat-head fasteners.
- Flat-head machine screws
- General-purpose flush mounting
- Most standard fastener applications
Available on top or bottom side of the material
90° Countersink
Used for metric flat-head screws (DIN 965 / ISO 10642) and some specialized aerospace fasteners. Choose this when your hardware specifies a 90° seat.
- Metric DIN 965 flat-head screws
- Aerospace fasteners
- European standard hardware
Available on top or bottom side of the material
Countersinking Basics
Everything you need to know about our countersinking service.
Integrated Process
Countersinks are machined during part production — no separate assembly step needed
Precision Finish
Consistent depth and angle for a perfect fastener seat every time
Volume Pricing
| Quantity | Price per Countersink |
|---|---|
| 1+ countersinks | $0.75/countersink |
| 10+ countersinks | $0.60/countersink |
| 50+ countersinks | $0.50/countersink |
| 100+ countersinks | $0.40/countersink |
| 500+ countersinks | $0.30/countersink |
Base price applies per order. Specify outer diameter in mm or inches when configuring.
Top or Bottom Side
Countersinks can be placed on either side of the material for maximum design flexibility
Instant Pricing
See countersink costs instantly in our quoting app — select holes, configure angle and diameter, and get live pricing
Countersink Geometry
Cross-section view of a countersunk hole showing key dimensions
Angle
82° or 90°
Outer Diameter
Configurable in mm or inches
Side
Top or bottom
Why Choose Countersinking?
Countersinks give you flush, professional fastener installations.
Flush Fasteners
Screw heads sit flush with the surface, eliminating snag points and allowing parts to stack or mate cleanly.
Clean Aesthetic
Countersunk fasteners create a smooth, professional appearance on visible surfaces.
Standard Angles
82° and 90° options cover ANSI, DIN, and ISO flat-head screw standards.
Both Sides Supported
Place countersinks on the top or bottom of your part depending on your assembly needs.
Hear from our customers
Riley Meik
American Housing Corp.
RMFG and @KennethCassel coming through with the great hardware
Jordan Noone
zoo.dev
Been ordering sheet metal parts from @KennethCassel / RMFG. Great interface and experience, easily my default option now.
Barrett Ames
botbuilt.com
first RMFG parts! Everything looks great.
David Yukon
k0defense.tech
Absolutely beautiful! My first order from RMFG. I know this is the beginning of many more orders to come! It's unbelievable to order & get the parts in hand on the same week! This is going to be tremendously valuable & allows me to iterate so much faster.
Caracara Metal
caracarametal.com
Big props to @rmfgdotcom for the precision laser cut and bend!
Garrett Scott
pipedreamlabs.co
RMFG has insane customer service every-time. If a part is critical, use them.