Holo Krome

About Holo-Krome: A Century of Fastener Innovation

Holo-Krome has been engineering precision fasteners since 1929, when the company was founded in Hartford, Connecticut around a then-revolutionary idea: producing fasteners through cold forming and metal heading processes rather than traditional machining. That fundamental innovation delivered superior structural integrity, less material waste, and batch-to-batch consistency that engineers could count on for the most demanding applications.

Today, headquartered in Wallingford, Connecticut and operating out of a modern 200,000-square-foot facility, Holo-Krome remains one of the few premium fastener brands that manufactures every single product entirely in the United States. At a time when the fastener industry largely moved offshore, Holo-Krome stayed committed to domestic production — ensuring complete traceability, rigorous quality control, and adherence to the tightest manufacturing standards in the industry.

The Thermo-Forged® Difference

Central to Holo-Krome's manufacturing philosophy is their proprietary Thermo-Forged® process. By pre-warming alloy steel to improve its plasticity before forming, Holo-Krome produces fasteners with enhanced mechanical properties, tighter dimensional tolerances, and fatigue resistance up to 15–20% greater than conventionally machined fasteners. The result is a forged socket that is far less susceptible to cracking, stripping, or hydrogen embrittlement than fasteners made by the traditional drill-and-broach method.

This process applies across their entire lineup — from socket set screws and cap screw assortments to structural bolts, jam nuts, and socket pipe plugs. Each fastener is manufactured, tested, and certified at the Wallingford facility, with quality control traceability extending all the way back to the originating steel mill.

Industries That Depend on Holo-Krome

Holo-Krome fasteners are specified for critical applications across a broad range of industries where fastener failure is simply not an option. These include aerospace, automotive, heavy equipment, agriculture, mining, construction, transportation, and communications. Whether it's a plow bolt or a B7 heavy hex cap screw on heavy machinery, or a socket pressure plug sealing a hydraulic system, Holo-Krome products are engineered to perform under punishing stresses and shocks.

The brand also offers custom fastener solutions, with the ability to work with a wide variety of materials — including aluminum, brass, austenitic and martensitic stainless steels, and 4000-series alloy steels — to solve difficult assembly challenges. If a standard size, material, or coating doesn't exist in the catalog, Holo-Krome can engineer it.

Why Choose Holo-Krome?

• 100% Made in the USA — every product manufactured and certified in Wallingford, Connecticut
• Proprietary Thermo-Forged® process for superior fatigue resistance and dimensional consistency
• Full traceability — each fastener traceable back to the originating steel mill
• Broad product range — from screw sets and bolts to jam nuts, pipe plugs, and pipe fittings
• Custom engineering support — over 90 years of application expertise available for special-specification parts
• Mil-Spec compliant products available for defense and aerospace requirements