The normate body is an exception disguised as universal. Rosemarie Garland-Thomson's concept of misfitting reveals that disability is not a property of bodies but a relation between bodies and environments—a mismatch that becomes exclusion only when infrastructure fails to accommodate variation. Alison Kafer's political-relational model insists that disability is neither tragedy nor identity but a site of political contestation, where assumptions about capacity, independence and worth are negotiated. This lens transforms how we understand infrastructure: not as neutral support but as normativity materialised, encoding assumptions about who will use it and how. Systemic lock—the protocols that shape who belongs—operates through these encoded norms, producing exclusion as default. Infrastructure Studies reveals how built environments, from doorways to transit systems, embed ableist standards that assume upright, mobile, sighted users. Science and Technology Studies traces how standards and protocols are developed, showing how the exclusion of non-normative bodies is designed into technical systems.