1.10 Responsibility for Modifications
The manufacturer shall not be held responsible
for malfunctions of product due to plating or other modifications, when such plating or
modification is not accomplished under his control or direction.
For definitions of terms relating to fasteners
or to component features thereof used in this Standard, refer to ASME B18.12, Glossary of
Terms for Mechanical Fasteners.
1.12 Referenced Standards
The following is a list of publications
referenced in this Standard. Unless otherwise specified, the most
recent standard available shall be used.
ASME B1.1, Unified Inch Screw Threads (UN
and UNR Thread Form)
ASME B1.3M, Screw Thread Gaging Systems for Dimensional Acceptability -
Inch and Metric Screw Threads (UN, UNR, UNJ, M, and MJ)
ANSI B18.12, Glossary of Terms for Mechanical Fasteners
ASME B18.18.1M, Inspection and Quality Assurance for General Purpose
ASME B18.18.2M, Inspections and Quality Assurance for High Volume Machine
ASME B18.18.3M, Inspection and Quality Assurance for Special Purpose
ASME B18.18.4M, Fasteners Produced from a Single Mill Heat With In-Process
Control and Lot Traceability
ASME B18.24.1, Part Identifying Number (PIN) Code System Standard for B18
Externally Threaded Products
ASME B46.1, Surface Texture
ASME B47.1, Gage Blanks
ASME Y14.5M, Engineering Drawings and Related Documentation Practices,
Dimensioning and Tolerancing
ASME Y14.6, Engineering Drawing and Related Documentation Practices, Screw
Publisher: The American Society of Mechanical Engineers (ASME), Three Park
Avenue, New York, NY 10016-5990; Order Department: 22 Law Drive, Box
2300, Fairfield, NJ 07007-2300
ASTM A 574, Standard Specification for Alloy Steel Socket-Head Cap Screws
ASTM F 835, Standard Specification for Alloy Steel Socket Button and Flat
Countersunk Head Cap Screws
ASTM F 837, Standard Specification for Stainless Steel Socket-Head Cap
ASTM F 879, Standard Specification for Stainless Steel Socket Button and
Flat Countersunk Head Cap Screws
ASTM B880, Standard Specification for Stainless Steel Socket Set Screws
ASTM F 912, Standard Specification for Alloy Steel Socket Set Screws
The American Society for Testing and Materials (ASTM), 100 Barr Harbor
Drive, West Conshohocken, PA 19428-2959
2 GENERAL DATA
In accordance with the provisions set forth in
the notes to the respective dimensional tables, screws shall have hexagon or spline
sockets as designated by the purchaser.
Gages and gaging procedures are included in Mandatory Appendix I,
except having minimum dimensions equal to minimum sizes of keys and bits
shown in Table 8 and Table 9,
respectively. Due to possible buildup of the socket, coated products
may not accept a standard hex or spline key.
Hexagon Sockets. Hexagon sockets shall conform with
the specifications given in Table 6.
2.1.2 Spline Sockets.
Spline sockets shall conform with the specifications given in Table 7.
Threads on all screw products covered in this Standard
shall be in accordance with ASME B1.1 for the series and
class specified in the notes to the respective product dimensional tables.
of screw threads shall be based on System 22, ASME B1.1, except where
otherwise specified in Note (14) of Table 5A.
2.3 Quality Assurance
Products will be furnished in accordance with ASME B18.18.
1M and thread acceptability to Inspection Level C, unless otherwise specified.
Products shall conform to the dimensions indicated in the
respective tables. The designated characteristics defined within the notes of each product
table shall be inspected in accordance with ASME B18.18.2M. For nondesignated dimensional
characteristics the provisions of ASME B18.18.1M shall apply. Should a nondesignated
dimension be determined to have a variance, it shall be deemed conforming to this Standard
if the user, who is the installer accepts the variance based on fit, form, and function
considerations. Where verifiable in-process inspection is used in accordance with ASME
B18.18.3M or ASME B18.18.4M, the final inspection level sample sizes of those respective
standards shall apply.