ASME B18.18 pdf free download
ASME B18.18-2017 pdf free download.Quality Assurance for Fasteners.
1.3 Measuring and Testing Equipment
All inspection and testing equipment that is used for the acceptance of Categories 2, 3, and 4 fasteners shall be calibrated by a laboratory that has been accredited to ISO! IEC 17025 by an accreditation body that operates in accordance with ISO/IEC 17011. Calibration may also be conducted by an organization authorized by the original equipment manufacturer. Calibration shall be traceable to the National Institute of Standards and Technology (NIST) Standard or an equivalent national or international standard.
1.4 Terminology
For definitions of terminology not specifically defined in this Standard, refer to ASME B18.12.
1.4.1 Lot. The definition of lot is provided in ASME B18,12. In the case of fastener assemblies, such as screw and washer assemblies, the manufacturer shall maintain lot traceability for all components. A finished fastener assembly lot shall comprise a single lot of each component that makes up the final assemhI
1.5 DesIgnation of Final Inspection Category
Procurement documenls should indicate which category (2,3, or 4) of final inspection is required. Examples of designation are provided under the appropriate inspection category sections of this document.
2 BASIC PLAN REQUIREMENTS
2.1 UnderstandIng the Basic Requirements
2.1.1 SamplIng Acceptance Criterion. The acceptance criterion for final inspection is zero nonconformities (C =0) for all inspections. However, it should be recognized that zero nonconformities (C = 0) in a sampling plan does not mean that the population is entirely free of defects.
2.2 In-Process Inspection
2.2.1 Fabricating Operations. General inspection procedures shall be established on the basis of engineering and manufacturing experience with regard to the effort of setup, tooling, operator, machine setup, and operation on each characteristic at each processing station. The minimum in-process requirements at each machine or processing station shall be as follows:
(a) Five pieces shall be visually examined for gross defects and surface discontinuities as required by the applicable standards. Three pieces shall be verified for part characteristics imparted to it by that machine or processing station in accordance with Table I at the following times:
(1) at the start of each production run
(2) at the start of each new shift
(3) when a tool is changed or when an adjustment in machine setup is made
(4) at the completion of each manufacturing operation
NOTE: When tungsten carbide dies are used, his onh necesaiy to verify a single piece for formed dimensions,
(b) During the production run, on a frequency of not less than one part per every 2 hr, parts shall be inspected for all designated part characteristics imparted to it by that machine or processing station in accordance with Table 1.
2.2.2 Heat Treatment. All heat-treating processes and heat-treatment equipment shall be regularly monitored to ensure process control and proper functioning of equipment. Monitoring equipment shall be calibrated by an accredited organization or an organization authorized by the original equipment manufacturer (see para. 1.3).
2.2.3 Finishing Operations. All plating, coating, and post lubrication processes and equipment shall be regularly monitored to ensure process control and proper functioning of equipment per applicable standards and specifications.
NOTE: Records o in-process inspections are not required for any category. II process records are maintained for Category 3products, the lower final inspection sample sizes shown in Table 2may be used instead of the sample sizes indicated in Table 3.
2.3 Final Inspection
Every lot of fasteners shall be subiected to a final inspection in accordance with the specified final inspection category The final inspection is intended to verily lot identification and to inspect designated characteristics for conformance to related standards, specifications,ASME B18.18 pdf download.
