Coated Bolts & Nuts

Coated Bolts & Nuts

1. Many coated bolts & nuts suppliers are unable to offer consistent quality of their products. Norimax management commits to high quality assurance in both product manufacture and technical service.

2. Norimax emplaces strict in-house quality assurance and quality control in the production of fluorocarbon coating of bolts & nuts.

3. Norimax has a dedicated in-house QA/QC and Research & Development team.

Norimax fluorocarbon-coated bolts & nuts meet the specifications of PETRONAS, SHELL, EXXONMOBIL, and other major oil & gas operators.

Stage 1 – Zinc Plating

Bare Bolts & Nuts

Material specifications

1. Material specifications for stud bolts shall be in accordance to ASTM A 193 GRADE B7 matching with

2. Heavy Hex Nut (UN) which material spec is ASTM A194 GRADE 2H.

Incoming Goods

1. Check appearance of bare bolts & nuts.

2. Surface must be free from any defects.

3. Thread-fit test

4. Random check on dimensions.

Stage 2 – Pre-Coating

Stage 3 - Fluorocarbon Coating

Stage 4 - Final Inspection

Visual Inspection

Acceptance Criteria

1. Free of surface defects.

2. 100% check

QC Procedures

Dry Film Thickness (DFT) check

Adhesion test

Curing test

Hardness test

Packaging & Preservation

Curing test

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