Standard No.:	GB/T 5784-1986
English Name:	Hexagon head bolts; Reduced shank; Product grades B
Chinese Name:	六角头螺栓 细杆 B级
Chinese Classification:	J13    Fastener
Professional Classification:	GB    National Standard
ICS Classification:	21.060.10 21.060.10    Bolts, screws, studs 21.060.10
Source Content Issued by:	SAC
Issued on:	1986-1-17
Implemented on:	1986-10-1
Status:	to be superseded
Superseded by:	GB/T 5784-2025 Fasteners - Hexagon head bolts - Reduced shank - Product grade B
Superseded on:	2026-2-1
Abolished on:	2026-02-01
Superseding:	GB 30-1976 Hexagon Head Bolts GB 21-1976
Target Language:	English
File Format:	PDF
Word Count:	2000 words
Translation Price(USD):	80.0
Delivery:	via email in 1 business day

1 Introduction This standard specifies the hexagon head bolts with thread size of M3~M20, reduced shank and of product grade B. This standard is identical to “Hexagon Head Bolts-Product Grade B-Reduced Shank(Shank Diameter ≈ Pitch Diameter)” (ISO 4015-1979). 2 Normative References GB 196-81 “General Purpose Screw Threads-Basic Dimensions for Diameter from 1 to 600mm”; GB 197-81 “General Purpose Screw Threads-Tolerances and Fits for Diameter from 1 to 355mm”; GB 2-85 “Fasteners-Ends of Parts with External Thread”; GB 3098.1-82 “Mechanical Properties of Fasteners-Bolts, Screws and Studs”; GB 3098.6-86 “Mechanical Properties of Fasteners-Stainless Steel Bolts, Screw and Nuts”; GB 3103.1-82 “Tolerances for Fasteners-Bolts, Screws and Nuts”; GB 5267-85 “ Electroplated Coatings on Threaded Fasteners”; GB 5779.1-86 “Surface Discontinuities of Fasteners on bolts, Screws and Studs for General Requirements”; GB 90-85 “Acceptance Inspection, Marking and Packaging of Fasteners”

1 Introduction 2 Normative References 3 Dimension 4 Technical Condition 5 Designation Additional Explanation: :