Pioneers in Mechanical Engineering & Machine Shop

Delivering precision machining, welding, fabrication, and industrial maintenance solutions across Oman since 1984.

ISO 9001·ISO 14001·ISO 45001 Certified

40+

Years of Excellence

38

Total Workforce

13

Core Services

3

ISO Certifications

Who we are?

Qais Contracting & Engineering Services Co. LLC is one of Muscat's pioneering mechanical engineering machine shop facilities, established in 1984 at Ghala, Muscat, Sultanate of Oman.

Over four decades, we have built a reputation for delivering precision machining, welding, fabrication and industrial maintenance services to clients across the oil & gas, construction, petrochemical and maritime sectors.

Our facility houses state-of-the-art machinery operated by fully trained engineers and technicians. We hold triple ISO certification (9001 / 14001 / 45001) issued April 2026, and are registered with the Oman Chamber of Commerce & Industry at Grade: First.

Strategic Value Propositions

Full-Spectrum Machine Shop

A dedicated one-stop facility managing intricate machining, turning, grinding, boring, welding, structural fabrication, and preventative mechanical maintenance solutions customized to heavy industrial parameters.

Certified Operations

Rigorous operational processing validated by Integrated Management Systems frameworks including ISO 9001:2015, ISO 14001:2015, and ISO 45001:2018 structures ensuring predictable mechanical tolerances.

Regional Legacy

Over 40 years of local continuous engineering partnership across Sultanate industrial corridors, deploying cross-functional technical teams specialized in emergency repairs and complex machinery restoration.

About Our Organization

Four Decades of Engineering Precision

Established in 1984, QAIS Contracting & Engineering Services Co. LLC has grown from a specialized machine workshop into a premier tier-one mechanical services partner in the Sultanate of Oman.

We maintain a deeply trained engineering and technical core of 38 professionals operating out of custom facilities, configured specifically to counter industrial wear, tool stress, and manufacturing downtime.

Our Core Value Directives

Precision Alignment: Tolerances tracked strictly to international specifications.
Operational Velocity: Minimizing plant downtime via rapid-mobilization field teams.
Safety Compliance: Zero-accident workplace frameworks deeply engineered into active routines.

Why Choose Us

40+ Years of Expertise

Established in 1984, four decades of proven engineering excellence for every client.

Full-Spectrum Machine Shop

One-stop facility: machining, grinding, boring, welding, fabrication and maintenance.

Lloyd's Approved Process

UNIMEX cold metal stitching — Lloyd's Register approved crack repair process.

Experienced Workforce

38 staff: 25 technical operators across machining, grinding, welding and fabrication; 13 in sales, admin and support.

Triple ISO Certified

ISO 9001 / 14001 / 45001 certified by INTERCERT (April 2026). Quality, environment and safety assured.

Trusted by Industry Leaders

Proud to serve Galfar, Bahwan, Gulf Petrochemical, Oman Cement and other majors.

Core Mechanical Services

We operate 13 distinct capability segments handled by certified master machinists and multi-disciplinary structural engineering personnel.

01

Crankshaft Grinding

Precision regrinding of diesel & petrol engine crankshafts.

02

Cylinder Block Reboring

Accurate cylinder reboring & honing for all engine types.

03

Line Boring

In-situ and workshop line boring for heavy equipment.

04

Surface & Radial Grinding

High-precision surface grinding and radial drilling.

05

Connecting Rod Regrinding

Big-end and small-end reconditioning and boring.

06

General Lathe Work

Custom turning, threading, facing and machining to drawing.

07

Gear Cutting

Spur and helical gear cutting to specification.

08

Cold Metal Stitching

UNIMEX system — Lloyd's approved crack repair.

09

Specialized Welding

Cast iron, aluminium & stainless welding.

10

Hydraulic Ram & Cylinder Manufacturing.

Manufacture, repair and testing of hydraulic cylinders.

11

Pressure Testing

Cylinder head & block pressure testing and descaling.

12

Excavator Bucket Fabrication

Buckets, booms, shovels and structural components.

13

Industrial Maintenance

Preventive & corrective maintenance for plant & equipment.

OUR EQUIPMENT IN ACTION

Our Promising Equipment List.

Machinery & Facilities Inventory

Our main shop floor hosts robust mechanical configurations built to manage extreme-weight components safely and accurately.

Machine Grouping	Capacity / Technical Spec Range	Functional Application
Heavy-Duty Lathes	Bed length configurations up to 6 meters	Large-diameter industrial shaft turning, truing, and thread tapping.
Vertical Boring Mills	Swing clearance ranges up to 2.5 meters	Heavy casing boring, wheel machining, and internal ring updates.
Surface & Cylindrical Grinders	High-tolerance finish limits within ±0.005mm	Re-conditioning critical mechanical seals and bearing fits.
Dynamic Balancing Rig	Payload limits up to 5 Metric Tons	Eliminating harmonic resonance in high-RPM rotational equipment elements.
Fabrication Power Presses	Forming operations force capacities up to 300 Tons	Heavy plate straightening, structural forming, and gear pressing extraction.

Quality Assurance & Compliance

ISO 9001:2015

Quality Management Systems governing standard calibration cycles, item tracking, and material inspections validation procedures.

ISO 14001:2015

Environmental standard profiles monitoring secure cutting oil disposal, scrap metals recycling control, and footprint reduction management.

ISO 45001:2018

Occupational Health & Safety management rules ensuring PPE execution, rigging safety audits, and persistent air quality validation monitoring.

Nondestructive Testing (NDT) Protocols

All reclaimed or freshly manufactured parts are subjected to thorough structural testing matrices based on client requirements, including Dye Penetrant Testing (DPT), Magnetic Particle Inspection (MPI), and Ultrasonic Testing (UT) to isolate micro-fractures before delivery.