BS 7715:1994 : Specification for Prevailing torque type bolts, screws and studs with non-metallic prevailing torque elements incorporated into the thread
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This British Standard specifies the coatings, dimensions, materials, lubrication and performance requirements for prevailing torque type bolts, screws and studs, with non-metallic prevailing torque elements incorporated into the thread, when tested at an ambient room temperature between 15 ᵒC and 30 ᵒC.
BS 7715:1994 : Specification for Prevailing torque type bolts, screws and studs with non-metallic prevailing torque elements incorporated into the thread