Cap screws, shoulder bolts, set screws and precision machined components for machinery builders, OEMs and plant maintenance teams, machined in Humble, Texas.
When a standard part will not do, or a standard part is not available, Patriot Bolt machines it. We make socket and hex head cap screws, shoulder bolts, set screws, carriage bolts and specials to your print, from prototypes to production runs.
Heat-treated 4140 and 4340 cover most high-strength machinery work, 304 and 316 stainless handle washdown and corrosive areas, and hardenable grades such as 420 are used for wear-resistant pins and set screws.
- Built toPrint or sample
- Run sizeOne-off to production
- Alloy steel4140 HT · 4340
- Stainless304 · 316 · 420
- QualityISO 9001:2015
What we make for industrial and manufacturing
Socket Head Cap Screws
Socket head cap screws in alloy and stainless.
PB-02Shoulder Bolts
Shoulder bolts in alloy and stainless.
PB-03Set Screws
Set screws, including hardened grades.
PB-04Hex Head Cap Screws
Hex head cap screws in alloy and stainless.
PB-05Carriage Bolts
Round-head carriage bolts.
PB-06Custom & Specialty Fasteners
One-off specials to production runs, to print.
Common grades we machine
| MATERIAL | WHY IT IS USED |
|---|---|
| 4140 HT | Heat-treated Cr-Mo alloy for machinery, tooling, shoulder bolts and socket products. |
| 4340 HT | Higher toughness than 4140 for heavy equipment and large-diameter fasteners. |
| 304 / 304L | General-purpose corrosion resistance for food, water and general service. |
| 316 / 316L | Better chloride resistance for marine, pharmaceutical and chemical areas. |
| 420 | Hardens to about 50 HRC for wear-resistant pins, set screws and shafts. |
| 17-4 PH | High strength with good corrosion resistance. |
See all 30+ grades in the Fastener Materials Matrix. Not sure which fits? Send the service temperature, pressure, media and any customer specification and we will recommend one.
Built to spec. Made in Texas.
Common questions
Can you make a fastener from a sample with no drawing?
Yes. Send the sample and we can measure it, confirm the material with you and machine replacements.
Do you make small quantities?
Yes. We machine everything from one-off specials to production runs.
Do you machine non-fastener parts?
Yes. Patriot Bolt machines precision components to customer drawings as well as fasteners.
Send us the print.
Drawing, spec sheet, sample or part number. We will quote it fast.