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4391M/A – 4 PCS Stud Puller Socket Set ½″ Drive | Metric & SAE Sizes
4391M/A – 4 PCS Stud Puller Socket Set (½″ Drive, Metric & SAE Sizes)
- 4 PCS Stud Puller Socket Set ½″ Drive – Metric & SAE
- 4-tlg. Stehbolzen-Abzieher-Stecknuss-Satz ½″
- Jeu de 4 Douilles Extractrices de Goujons ½″
- Juego de 4 Llaves de Extracción de Espárragos ½″
- 4件式 ½″ 拉拔螺柱套筒组 (公制 + 英制)
- 4本組 スタッドプーラーソケットセット ½″
- 4PCS 스터드 풀러 소켓 세트 ½″ (미터 및 인치 규격)
- Built for Precision: Essential Accessories for Every Technician’s Work
4391M is a specialized 4-piece automotive and industrial MRO tool set engineered for the high-torque removal and installation of threaded studs. Utilizing a sophisticated concentric roller bearing mechanism, these sockets provide a non-slip grip on smooth or threaded cylindrical surfaces. Unlike traditional “pipe wrench” methods that can crush or score the workpiece, the 4391M series distributes clamping force evenly around the stud’s circumference, allowing for the extraction of seized, rusted, or broken studs without damaging the remaining threads.
| 4391M (mm) | 4391A (inch) | D1 (mm) | D2 (mm) | L (mm) |  g |  pcs |
|---|---|---|---|---|---|---|
| 6 | ¼ | 21 | 24 | 60 | 120 | 10 |
| 8 | ⁵ᐟ₁₆ | 21 | 24 | 61 | 120 | 10 |
| 10 | ⅜ | 21 | 28 | 69 | 180 | 10 |
| 12 | ⁷ᐟ₁₆ | 21 | 30 | 69 | 220 | 10 |
| Blow Case: 230*120*43 |  15KGs | =20 Sets Cuft: 0.9' |
Feature
Technical Architecture & Mechanical Logic
- Concentric Triple-Roller Mechanism: The internal architecture consists of three precision-ground rollers that tighten automatically as torque is applied. This “cam-action” logic ensures that the more force is exerted, the tighter the tool grips the stud.
- 1/2″ Square Drive Interface: Compatible with standard ratchets, breaker bars, and torque wrenches for controlled manual operation in high-resistance scenarios.
- Damage-Free Thread Protection: The rollers are designed to grip the stud body securely without biting deep into the metal, preserving the structural integrity of the stud for reuse or preventing further breakage during extraction.
- 4-Piece Metric Range: Specifically sized for the most common industrial and automotive fasteners: 6, 8, 10, and 12mm.
- Industrial Cr-V Forging: The outer housing is forged from Chrome Vanadium steel, while the internal rollers are hardened to withstand extreme localized pressure during the “bite” phase.
B2B Procurement & Workshop ROI
- Reduced Labor Overhead: Drastically shortens the time required to remove manifold studs, cylinder head studs, and industrial housing fasteners compared to “double-nutting” or destructive extraction methods.
- Bi-Directional Functionality: The roller mechanism operates effectively in both clockwise and counter-clockwise directions, making these sockets equally useful for installing new studs to specific torque values.
- High-Access Profile: The socket-style design allows the tool to fit into recessed areas and engine bays where traditional locking pliers or stud extractors cannot swing.
- Professional Organization: Supplied in a rugged, blow-molded carrying case with dedicated size-labeled compartments, ensuring rapid tool selection and preventing the loss of components in high-volume workshops.
FAQ Section
- Can these be used with impact wrenches? No. To prevent shattering of the internal rollers and to protect the stud threads, these should be used with manual hand tools only.
- Will it work on broken studs? The tool requires a small amount of exposed stud (typically 10-15mm) to allow the rollers to engage. For studs broken flush with the surface, a drill-out extractor is required.
- Are the internal rollers replaceable? These are precision-assembled units designed for long-term industrial service; while extremely durable, they are typically replaced as a complete socket unit.
