Specialist bolt torquing and hydraulic tensioning services for Saudi Arabia oil and gas, petrochemical, refining, and power sectors. Headquartered in Al Jubail. Mobilising to Jubail Industrial City, Ras Tanura, Abqaiq, and all major industrial sites across the Kingdom.
ZARQGroup is a specialist bolting contractor headquartered in Al Jubail, adjacent to Jubail Industrial City. We provide bolt torquing, hydraulic tensioning, and related bolting services to the oil and gas, petrochemical, and power sectors across the Kingdom of Saudi Arabia.
Our teams work directly with Saudi Aramco, SABIC affiliates, SIPCHEM, and Tier-1 EPC contractors on planned maintenance shutdowns, turnarounds, and new project construction. All bolt torquing technicians are trained to ASME PCC-1 guidelines and work under documented quality procedures.
ZARQGroup provides a full range of precision bolting services for industrial process plant, from routine maintenance bolting to critical pressure-boundary joint assembly.
The table below summarises ZARQGroup principal equipment categories and typical applications. All equipment is owned and maintained in-house.
| Service | Equipment | Size Range | Application |
|---|---|---|---|
| Hydraulic Torque Wrench | Low-profile cassette, Standard cassette | 1/2 inch to 4 inch drive | Flanged joints, Structural bolting |
| Hydraulic Stud Tensioner | Single, Multi-stud sequential | M24 to M160 | Large-bore flanges, Pressure vessels |
| Pneumatic Impact Torque | Handheld pneumatic gun | Up to 1-1/2 inch drive | General service, Non-critical joints |
| Torque Verification | Calibrated check wrench, Digital gauge | All sizes | Witness testing, QC verification |
| Bolt Elongation Measurement | Ultrasonic bolt gauge | M20 to M160 | Critical joints, High-pressure flanges |
ZARQGroup teams on-site across Saudi Arabia industrial corridor, from Jubail Industrial City to Ras Tanura, Abqaiq, and beyond.
Choosing the correct bolting method depends on flange rating, stud diameter, access constraints, and client specification. ZARQGroup engineers advise on method selection as part of the pre-job planning process.
Indicative torque values (ft-lbs, plain finish) for common bolt grades by nominal diameter. All values are estimates per ASME PCC-1 guidance – verify against your engineering specification before use.
| Bolt Size | TPI | Plain (ft-lbs) | Galvanised (ft-lbs) | Galv + Waxed (ft-lbs) |
|---|---|---|---|---|
| 1/2 in | 13 | 93 | 116 | 47 |
| 5/8 in | 11 | 186 | 232 | 93 |
| 3/4 in | 10 | 329 | 411 | 164 |
| 7/8 in | 9 | 530 | 663 | 265 |
| 1 in | 8 | 796 | 995 | 398 |
| 1-1/8 in | 7 | 1,126 | 1,408 | 563 |
| 1-1/4 in | 7 | 1,590 | 1,987 | 795 |
| 1-3/8 in | 6 | 2,085 | 2,606 | 1,042 |
| 1-1/2 in | 6 | 2,767 | 3,458 | 1,383 |
| 1-3/4 in | 5 | 4,364 | 5,455 | 2,182 |
| 2 in | 4-1/2 | 6,563 | 8,203 | 3,281 |
| 2-1/2 in | 4 | 13,125 | 16,406 | 6,563 |
| 3 in | 4 | 21,268 | 26,585 | 10,634 |
Source: Portland Bolt / ASME PCC-1. K=0.20, 75% proof load, plain finish. Verify against your engineering specification before use.
| Bolt Size | ASTM A325 | SAE Grade 5 | SAE Grade 8 |
|---|---|---|---|
| 1/2 in | 100 | 75 | 107 |
| 5/8 in | 198 | 150 | 212 |
| 3/4 in | 350 | 266 | 376 |
| 7/8 in | 569 | 429 | 606 |
| 1 in | 850 | 644 | 909 |
| 1-1/4 in | 1,687 | 1,120 | 1,875 |
| 1-1/2 in | 2,950 | 1,950 | 3,161 |
ZARQGroup owns its torquing and tensioning fleet. All tools carry current calibration certificates traceable to a national standard, available for client audit on request.
Our equipment inventory includes hydraulic torque wrenches from 1/2 inch to 4 inch drive (low-profile and standard cassette heads), hydraulic stud tensioners for stud diameters M24 to M160, dedicated pump units with remote-control operation for confined-space and elevated work, and pneumatic impact tools for standard applications.
We do not rely on hired equipment from third parties for critical bolting campaigns. All tools are maintained, inspected, and re-calibrated at scheduled intervals per our QC procedures.
All ZARQGroup bolt torquing and tensioning work is executed in compliance with applicable international standards and client-specific bolting procedures.
ZARQGroup executes bolt torquing contracts across all major industrial sectors in Saudi Arabia. Our teams are experienced working under Tier-1 EPC contractors and directly with Saudi operators.
ZARQGroup is headquartered in Al Jubail, adjacent to Jubail Industrial City (SIPCHEM, SABIC affiliates, Aramco assets), and mobilises bolt torquing crews to all major industrial centres across the Kingdom.
Submit your scope, flange schedule, or shutdown dates and our team will confirm crew availability, equipment fit, and pricing within one business day.