QC/T 856-2011 (English Version) PDF

Scope: This standard specifies the types, dimensions, and technical conditions of hexalobular countersunk head screws. This standard applies to automotive hexalobular countersunk head screws with thread specifications of M6 to M16 and mechanical performance grades of 4.8 and 8.8.

QC/T 856-2011 Referenced Document

GB/T 193 General purpose metric screw threads--General plan
GB/T 2 Fasteners.Ends of parts with external thread*， 2016-02-24 Update
GB/T 3098.1 Mechanical properties of fasteners.Blots, screws and studs
GB/T 3103.1 Tolerances for fasteners--Bolts,screws,studs and nuts
GB/T 3106 Fasteners.Bolts, screws and studs.Nominal lengths and thread lengths*， 2016-02-24 Update
GB/T 5279 Countersunk head screws--Head configuration and gauging
GB/T 5779.1 Fasteners-Surface discontinuities-Bolts,screws and studs for general requirements
GB/T 6188 Hexalobular internal driving feature for bolts and screws*， 2017-12-29 Update
GB/T 90.1 Fasteners—Acceptance inspection*， 2023-05-23 Update
GB/T 90.2 Fasteners--Marking and packaging
GB/T 9145 General purpose metric screw threads--Limits of sizes for the screw threads of medium quality and preferable plan
QC/T 326 Coding rules for automotive standardized parts*， 2013-10-17 Update
QC/T 625 Metallic coatings and conversion coatings for automobile*， 2013-04-25 Update