Commitment from collaborating partners has been identified as one of the most prominent elements desirable to and hence solicited by organizations. To help explain and predict collaborators’ commitment to a focal organization, this study tested two important factors as antecedents: supervisory control and perceived autonomy After validating the positive link, the boundary conditions for the positive effects of supervisory control and autonomy were explored. Data were collected from 224 subcontractors of the China State Construction Engineering Corporation based in Hong Kong and Macao. Distributive justice and the flexibility norm moderated the relationships between the two predictors and commitment level, thus supporting the hypotheses. Specifically, distributive justice accentuated the positive effect of autonomy and the flexibility norm accentuated the positive effect of supervisory control. The theoretical and practical implications of the study in an organizational setting are discussed.