1. Prodotto finitoview
The Armstrong 78-403 C-Clamp is a robust and versatile hand tool designed for securely holding workpieces in place during various tasks such as welding, gluing, drilling, or assembly. This deep throat pattern C-clamp features a 3-inch maximum capacity and is forged from domestically produced alloy steel, ensuring high strength, toughness, and durability. Its design includes a forcing screw with a sliding handle for efficient operation and a swivel pad that completely encircles the ball joint, providing permanent attachment and full swivel action.

Figure 1: The Armstrong 78-403 C-Clamp. This image shows the black oxide finished C-clamp with its main body, forcing screw, sliding handle, and swivel pad.
Le caratteristiche principali includono:
- Made in the USA, ensuring quality and availability.
- Most popular and versatile style C-clamp per un'ampia gamma di applicazioni.
- Forcing screw equipped with a sliding handle for ease of tightening and loosening.
- Swivel pad designed to completely encircle the ball joint, providing permanent attachment and full swivel action for secure gripping on uneven surfaces.
- Heavy-walled hub supports the forcing screw, reducing distortion under pressure.
- Black oxide finish for corrosion resistance.
2. Informazioni sulla sicurezza
Always observe the following safety precautions when using the Armstrong 78-403 C-Clamp to prevent injury or damage to property:
- Indossare adeguati dispositivi di protezione individuale (DPI), including safety glasses, to protect against flying debris or unexpected movement of the workpiece.
- Ispezionare il clamp prima di ogni utilizzo. Ensure the frame, screw, and swivel pad are free from cracks, bends, or excessive wear. Do not use a damaged clamp.
- Non stringere troppo il clamp. Excessive force can damage the clamp, the workpiece, or cause the clamp to slip. Tighten only enough to secure the workpiece firmly.
- Ensure the workpiece is stable. Before applying force, confirm that the workpiece is properly supported and will not shift unexpectedly.
- Evita clamping on uneven or slippery surfaces without proper precautions to prevent slippage.
- Tenere le mani e le dita libere del clamping area when tightening or loosening the screw.
- Non usare il clamp as a lifting device or for purposes other than clamping.
- Conservare il clamp correttamente when not in use, in a clean, dry place to prevent rust and damage.
3. Impostazione
The Armstrong 78-403 C-Clamp requires minimal setup. Follow these steps to prepare it for use:
- Disimballare il clamp: Rimuovi il clamp dalla sua confezione.
- Inspect for shipping damage: Visually check the clamp for any signs of damage that may have occurred during transit.
- Clean the threads: If necessary, wipe down the forcing screw threads to remove any debris or excess lubricant.
- Lubrificare (facoltativo): For smoother operation, a light application of machine oil or grease can be applied to the forcing screw threads periodically.
4. Istruzioni per l'uso
Using the Armstrong 78-403 C-Clamp effectively involves a few simple steps:
- Position the workpiece: Place the items to be clamped together on a stable work surface.
- Aprire il clamp: Rotate the sliding handle counter-clockwise to open the clamp jaws wide enough to fit over the workpiece.
- Posizionare il clamp: Posizionare il clamp so that the fixed jaw rests against one side of the workpiece and the swivel pad of the forcing screw aligns with the other side. Ensure the clamp is perpendicular to the workpiece for even pressure distribution.
- Stringere la clamp: Rotate the sliding handle clockwise to advance the forcing screw. Continue tightening until the workpiece is held securely. The swivel pad will adjust to the surface of the workpiece, providing a firm grip. Do not overtighten.
- Verify security: Gently attempt to move the clamped workpiece to ensure it is firmly held and will not shift during your task.
- Rilasciare il clamp: Once your task is complete, rotate the sliding handle counter-clockwise to retract the forcing screw and release the workpiece.
5. Manutenzione
Proper maintenance will extend the life and ensure the reliable performance of your Armstrong 78-403 C-Clamp:
- Pulizia: Dopo ogni utilizzo, pulire il clamp to remove any dust, debris, or residue. Pay particular attention to the screw threads.
- Lubrificazione: Periodically apply a light coat of machine oil or grease to the forcing screw threads. This prevents rust and ensures smooth operation.
- Ispezione: Ispezionare regolarmente il clamp for signs of wear, damage, or deformation. Check for cracks in the frame, bent screws, or damaged swivel pads.
- Magazzinaggio: Conservare il clamp in a dry environment to prevent corrosion. Avoid storing it in damp o condizioni umide.
- Parti di ricambio: If the forcing screw (part number 95-458) or swivel pad (part number 95-411) becomes damaged, genuine replacement parts are available to restore the clampla funzionalità.
6. Risoluzione Dei Problemi
This section addresses common issues you might encounter with your C-clamp:
| Problema | Possibile causa | Soluzione |
|---|---|---|
| Clamp slips or does not hold workpiece securely. | Insufficient tightening; oily or slippery workpiece surface; damaged swivel pad; clamp capacity exceeded. | Tighten further (without overtightening); clean workpiece surface; replace swivel pad (95-411); use a larger clamp if capacity is exceeded. |
| Forcing screw is difficult to turn. | Lack of lubrication; dirt/debris in threads; bent screw. | Apply lubricant to threads; clean threads thoroughly; if bent, replace forcing screw (95-458). |
| Clamp frame appears bent or cracked. | Excessive force applied; impact damage. | Interrompere l'uso immediatamente. A damaged frame compromises safety and performance. Replace the clamp. |
7. Specifiche
Detailed specifications for the Armstrong 78-403 C-Clamp:
| Attributo | Valore |
|---|---|
| Numero di modello | 78-403 |
| Materiale | Acciaio legato |
| Capacità massima | 3 pollici |
| Capacità minima | 0 pollici |
| Depth of Throat (from Center of Screw) | 2-3/4 pollici |
| Dimensione del filo | 1/2/8 |
| Length of Screw | 5-3/4 pollici |
| Minimum Proof Test | 3,500 libbre |
| Fine | Ossido nero |
| US Federal Specification | GGG-C-406d |
| Peso dell'articolo | 1.95 libbre |
| Dimensioni del prodotto (L x P x A) | 8.25 x 4.5 x 1.5 pollici |
| Replacement Forcing Screw Part No. | 95-458 |
| Replacement Pad Part No. | 95-411 |
8. Garanzia e supporto
For specific warranty information regarding your Armstrong 78-403 C-Clamp, please refer to the documentation provided at the time of purchase or visit the official Armstrong Tools website. General support for Armstrong Industrial Hand Tools can be obtained through their customer service channels.
For further assistance or inquiries, please contact Armstrong customer support. Contact details are typically available on the manufacturer's official websito o confezione del prodotto.
Note: Specifications are subject to change without notice. Always refer to the latest product information from the manufacturer.