Custom Machined Nuts

Resolute Precision Manufacturing produces custom CNC machined nuts to your drawing: hex nuts, jam nuts, castle nuts, coupling nuts, cap nuts, and fully proprietary nut profiles in steel, stainless, brass, aluminum, and titanium. When catalog nut stock does not meet your thread form, material, or tolerance requirement, our precision machined nuts are made directly to your specification. No minimum quantity. 24-hour quote response.

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When a Custom Nut Is Required

Standard catalog nuts cover the most common thread forms in the most common materials. Custom machined nuts are required when your application falls outside those parameters: a non-standard thread pitch or form, a special material such as titanium or 17-4 PH stainless, a close-tolerance bearing or locating surface on the nut OD, a proprietary external geometry, or a standard thread combined with an unusual hex or drive profile.

Our precision machined nuts are produced on CNC lathes and Swiss CNC machines with live tooling. The internal thread, external hex or profile, face features, and any locking geometry are all machined in one setup, which maintains an accurate relationship between the thread axis and the external features.

Custom Nuts We Produce

We produce all standard nut forms and fully custom nuts to drawing:

Hex nuts and jam nuts: standard and non-standard thread forms in any material
Castle and slotted nuts: machined slots for cotter pin retention
Acorn and cap nuts: enclosed dome profile for end protection and appearance
Coupling nuts: extended body for rod end and stud connection applications
Prevailing torque nuts: all-metal locking feature machined into the nut body
Flange nuts: integral bearing flange machined in the same setup as the thread
Weld nuts: machined pilot and weld projection for automated welding
Machined retaining nuts: a solid machined alternative where custom speed nuts (stamped clip nuts) can’t deliver the thread strength, material, or tolerance you need
Proprietary profile nuts: any external geometry specified on your drawing

Custom Acorn, Dome and Cap Nuts

Acorn cap nuts, also known as dome nuts, cover the exposed end of a bolt or stud. They protect the threads, shield people from sharp thread ends, and give the assembly a finished look. Because the dome, hex, and internal thread are machined in one setup, the crown stays concentric with the thread. Hex nuts and jam nuts: standard and non-standard thread forms in any material

Stainless steel acorn nuts: 303, 304, and 316 for corrosion resistance in marine, food, and outdoor assemblies
Stainless steel dome nuts: the same grades with passivation where cleanliness or corrosion performance matters
Brass acorn nut and brass cap nut: brass 360 for decorative, electrical, and low-corrosion applications
Black acorn nuts: steel with black oxide through outside coating services
High crown acorn nuts: taller dome profiles for long thread run-out, with crown height set on your drawing

Applications for Precision Machined Nuts

Custom machined nuts from Resolute Precision serve industries where catalog hardware is insufficient:

Aerospace and defense: titanium and 17-4 PH stainless nuts made to proprietary drawings
Medical devices: 316L stainless nuts with non-standard thread forms for instrument assemblies
Automotive: specialty locking and prevailing torque nuts for powertrain and chassis applications
Fluid power: high-pressure coupling nuts with sealing thread forms and tight tolerances
Industrial machinery: large coupling and flange nuts in alloy steel for drive system applications
Marine hardware: silicon bronze and 316 stainless nuts for above- and below-waterline use

Specifications

Thread Range	Any thread form and pitch—Unified (UNC/UNF/UNEF), metric (M/MJ), pipe, Acme, or custom
Nut Types	Hex, jam, castle, acorn, coupling, flange, weld, prevailing torque, and custom profiles
OD/Hex Size	From small hex sizes on Swiss CNC machines to large nuts on chucked turning centers
Thread Class	Class 2B standard; Class 3B precision available on request
Metals	Steel (1018/4140/4340), stainless steel (303/304/316/17-4PH), brass (360/385), aluminum (6061), titanium (Grade 5)
Heat Treatment	Coordinated through outside operations; quench & temper (Q&T), carburizing, and nitriding available
Coating	Black oxide, zinc, nickel, and passivation through outside coating services
Volume	100 to 500,000+ nuts per year
Certifications	ISO 9001:2015

Frequently Asked Questions

Can RPM produce nuts with non-standard thread pitches?

Yes. Our CNC lathes produce any thread pitch programmable in the control: fine, extra-fine, non-standard (UNS), metric fine, and custom pitches. We are not limited to available taps, because the thread is generated directly by the machine’s thread interpolation

What is a prevailing torque nut and can RPM produce one?

A prevailing torque nut has a built-in locking feature that creates friction against the mating thread, so it resists loosening from vibration. We machine all-metal locking features to your drawing, which suits high-temperature applications where nylon-insert nuts can’t be used. Send the torque and temperature requirements with your drawing and we’ll flag any concerns when we quote.

Can RPM produce castellated nuts with cotter pin slots?

Yes. Slots are machined with live tooling in the same setup as the thread and hex, so slot width, depth, and count are held to your drawing and stay aligned with the thread axis. The cotter pin passes through the bolt hole and the slots to lock the nut in position.

Does RPM make custom speed nuts?

Custom speed nuts are stamped sheet-metal clip nuts, which is a different process from machining. If you need a stamped clip nut, we aren’t the right source. If a stamped nut doesn’t meet your thread strength, material, or tolerance needs, we can make a solid alternative to your drawing.