Custom CNC Turned Bolts
Resolute Precision Manufacturing provides custom CNC bolt machining, producing custom bolts to drawing in a wide range of materials, thread forms, head styles, and drive configurations. Our Swiss CNC machines and bar-fed lathes manufacture precision CNC bolts from 3/8 inch to 3.2 inches in bar diameter, with larger head diameters possible through chucking. We produce quantities from prototypes to high-volume production and supply manufacturers and OEMs across the Midwest and beyond. Request a QuoteWhat a CNC Turned Bolt Can Do That a Standard Bolt Cannot
Catalog bolts are designed to cover common applications using standardized dimensions, materials, threads, and head configurations. Custom Bolts are manufactured for applications where a standard fastener cannot meet the required specifications.
Resolute Precision manufactures bolts entirely to your drawing. Thread form, pitch, head geometry, shank diameter and tolerance, overall length, drive feature, material, and other specifications are defined by your requirements. We machine each component using the same ISO 9001:2015-controlled manufacturing process used for our precision turned components.
Our Custom CNC Bolt Machining Capabilities
Our custom CNC bolt machining runs on Swiss CNC machines and bar-fed lathes, turning the shank, head, thread, and drive feature from a single bar in one setup. That process helps hold the concentricity and thread-to-shank alignment that precision CNC bolts require, from the first prototype to the last production lot.
When weight, corrosion resistance, or non-magnetic behavior matters, CNC aluminum bolts in 6061 or 7075 are machined with the same drawing-driven process, with head, thread, and drive geometry defined by your print.
Drive Features Machined in the Same Setup
Common bolt drive features, including hex socket, Torx, Phillips, slotted, external hex, and spline, can be machined using live tooling in the same operation as the thread and shank. This minimizes secondary handling and helps maintain positional accuracy between the drive feature, thread, and bolt axis.
Specifications
| Diameter Range | 3/8″ to 3.2″ bar-fed; larger head diameters by chucking |
| Thread Standards | Unified (UNC/UNF/UNEF/UNS), metric (M/MJ), pipe (NPT/BSPT/BSPP), Acme, buttress, custom |
| Head Styles | Hex, button, socket head, flat head, pan head, flanged, custom |
| Drive Features | Hex socket, Torx, Phillips, slotted, hex external, spline, custom — machined with live tooling |
| Shoulder Bolts | Precision shoulder diameters to ±0.0005″; common for pivot and alignment applications |
| Metals | Steel (1018/4140/4340), stainless steel (303/304/316/17-4PH), brass, aluminum (6061/7075), titanium (Grade 5) |
| Surface Finish | Standard machined finishes; finer finishes available upon request based on tooling and process requirements |
| Materials | All standard metals and engineering plastics |
| Certifications | ISO 9001:2015 |
Custom Bolt Applications
Resolute Precision custom bolts serve applications where catalog fasteners are not suitable, including:
- Shoulder bolts for precision pivot, hinge, and alignment applications requiring tight shank tolerance
- Aerospace and defense bolts in titanium and 17-4 PH stainless steel to proprietary specifications
- Medical device fasteners in 316L stainless steel or titanium with non-standard thread forms
- Fluid power and hydraulic system bolts with special sealing thread forms
- Industrial machinery special bolts with proprietary head geometry or drive features
- Automotive powertrain bolts requiring non-standard pitch or material specifications
- Lightweight and non-magnetic fasteners
- CNC aluminum bolts in 6061 or 7075 for weight-sensitive assemblies and enclosures
Industries We Serve
Resolute Precision Manufacturing supplies precision CNC bolts for manufacturers and OEMs across industries where application-specific dimensions, materials, threads, and tolerances are required. Our precision machining capabilities support prototype, low-volume, and production requirements for:
Fluid Power & Hydraulics — bolts and fasteners with special sealing thread forms for valve, cylinder, and fitting assemblies
Medical Devices — Swiss-turned bolts and screws in stainless steel, titanium, and PEEK
Automotive — high-volume bar-fed bolts and sub-assembly fasteners
Aerospace & Defense — tight-tolerance titanium and 17-4 PH bolts
Industrial Machinery — special and shoulder bolts with proprietary head geometry or drive features
Frequently Asked Questions
What is the difference between a standard bolt and a precision shoulder bolt?
A standard bolt has a shank diameter tolerance of approximately ±0.005″ relative to the nominal thread pitch diameter. A precision shoulder bolt has a ground or turned shank with tolerance typically ±0.0005″ or tighter used where the shank functions as a bearing surface, pivot, or precision locating feature.
Can RPM produce bolts with non-standard thread pitches?
Yes. We produce any thread pitch that can be specified on a drawing fine, extra-fine, non-standard (UNS), metric fine, and fully custom pitches. Our CNC lathes produce thread pitch directly from the part program without requiring a specific tap or die.
What material should I specify for bolts in a corrosive environment?
316L stainless steel provides excellent corrosion resistance for most aqueous and mild chemical environments. For more aggressive environments, consider 17-4 PH stainless (heat treatable for strength) or titanium Grade 5 (superior corrosion resistance with high strength). Contact us for a material recommendation based on your specific environment.
Can RPM supply bolts with heat treatment and certifications?
Yes. We coordinate heat treating through our outside operations network and can provide material certifications, heat treat records, and dimensional inspection reports as part of the delivery package.