Material Acc of Bolts and Nuts

This discussion is part of Material Acceptance - Steel Material for describe additional requirements of BOLT & NUT

a) It required for both bolts and stud (including nuts and accessories)
b) Ordering Information
Information items to be considered in the purchase order are not limited to the following:
i) Specification designation (the year date should be included0.
ii) Name of product (bolt or stud)
iii) Grade
iv) Quantity (number of pieces by size, including nuts))
v) Size and length.
vi) Washers – specify quantity and size
vii) Finish coat
viii) Supplementary requirements.
ix) Certification

c) Marking
All bolt heads and one end of studs shall be marked with unique identifier by manufacturer to identify the manufacturer.

The grade identification shall be marked of bolt in accordance with relevant material specification.

Marking location and methods:
- Bolt shall be marked on the top of the bolt head.
- Where stud have both coarse thread and fine threads, all marking shall appear on the coarse thread end or, if preferred, the manufacturer’s identification shall appear on the fine thread end and the grade marking on the coarse thread end.
- Continuous thread studs may be marked on either end.
- All marking may be raised or depressed at the manufacturer’s option.
- Grade and manufacturer’s identification shall be separate and distinct. The two identifications shall preferably be in different locations and when on the same level shall be separated by at least two spaces.

d) Surface Quality

Each lot of bolts and/ or studs shall be visually inspected for free of burrs, laps, seams, cracks, and other injurious material or manufacturing defects which would make them unsuitable for the intended application

Surface discontinuity limits shall be in accordance with specification.

e) Certification
Manufacturer or supplier shall certify and furnish a test report which includes the following:
- Product description, grade, quantity, material specification number and issue date.
- Alloy grade, heat analysis, heat number, and type of quench.
- Result of hardness, tensile and proof load test, as applicable.
- Statement of compliance to protective coating specification (if applicable) and baking time and temperature, if not baked, state “not baked”
- Statement of compliance with the surface discontinuity requirements refer to the relevant specification.
- Statement of compliance dimensionally.
- Report, describe, or illustrate manufacturer’s marking and their location.
- Lot number, purchase order number, and date shipped.
- Country of origin, and
- Title and signature of the individual assigned certification responsibility by the company officers, with complete mailing address.