New and remanufactured Stamford alternator ends across the full frame range — HC, HCI, UCI, UCM, UCD, UCDI, P, and PI series. Sized to match your existing generator set exactly.
Compact single-bearing alternator end for smaller standby and prime power sets. Suitable for single-phase and three-phase output configurations. Widely used on light commercial generator sets.
Higher-output single-bearing end in the HC family. The HCI4 is a standard choice for commercial standby sets in the 25–65kVA range. Available in multiple voltage configurations.
The largest frame in the HC single-bearing family. The HCI5 handles outputs up to 100kVA, making it suitable for mid-range commercial standby applications including hospitals and commercial buildings.
Entry-level two-bearing UCI frame for smaller commercial sets. Provides greater mounting flexibility than the single-bearing HC series and suits a wide range of engine configurations.
Mid-range UCI frame delivering 30–100kVA. One of the most common replacement ends in the market — found on generator sets from all major OEMs. Available new and remanufactured.
The UCI4 is the workhorse of the commercial standby market — covering 100–200kVA, it is found on the majority of hospital, data center, and commercial building generator sets in the US.
Upper range of the UCI/UCM family, delivering up to 250kVA. The UCM5 suits larger commercial standby sets and light industrial prime power applications requiring higher continuous output.
Entry-level UCD frame delivering 250–350kVA. A step up from the UCM family for applications requiring higher sustained output ratings. Common on large commercial standby installations.
Upper-range UCD frame for demanding commercial and light industrial applications. The UCD6 delivers up to 500kVA and is commonly specified for large hospital, data center, and utility standby sets.
Industrial-specification UCD frame for continuous prime power and demanding duty cycles. The UCDI features enhanced insulation systems and a higher ingress protection rating for industrial environments.
Entry-level P series alternator end, delivering 500–800kVA in a robust single-bearing design. Suited to large commercial standby and prime power applications requiring high output in a compact package.
Mid-range P series delivering 800–1250kVA. The P8 is a common specification for large data center and industrial standby sets. Available with PMG excitation for enhanced fault-ride performance.
High-output P series delivering 1250–2000kVA. Specified for the largest commercial and industrial generator sets — utility substations, large data centers, and mission-critical facilities requiring the highest output in a single alternator end.
To supply the correct replacement alternator end, we need a few details from your existing unit's nameplate. The more information you can provide, the faster we can quote.