1. Produktet er slutview
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.
Nøglefunktioner omfatter:
- Made in the USA, ensuring quality and availability.
- Most popular and versatile style C-clamp til en bred vifte af applikationer.
- 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. Sikkerhedsoplysninger
Always observe the following safety precautions when using the Armstrong 78-403 C-Clamp to prevent injury or damage to property:
- Brug passende personlige værnemidler (PPE), including safety glasses, to protect against flying debris or unexpected movement of the workpiece.
- Undersøg clamp før hver brug. Ensure the frame, screw, and swivel pad are free from cracks, bends, or excessive wear. Do not use a damaged clamp.
- Spænd ikke 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.
- Undgå clamping on uneven or slippery surfaces without proper precautions to prevent slippage.
- Hold hænder og fingre fri af clamping area when tightening or loosening the screw.
- Brug ikke clamp as a lifting device or for purposes other than clamping.
- Opbevar klamp ordentligt when not in use, in a clean, dry place to prevent rust and damage.
3. Opsætning
The Armstrong 78-403 C-Clamp requires minimal setup. Follow these steps to prepare it for use:
- Pak clamp: Fjern clamp fra sin emballage.
- 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.
- Lubricate (optional): For smoother operation, a light application of machine oil or grease can be applied to the forcing screw threads periodically.
4. Betjeningsvejledning
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.
- Åbn clamp: Rotate the sliding handle counter-clockwise to open the clamp jaws wide enough to fit over the workpiece.
- Placer clamp: Placer 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.
- Spænd 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.
- Slip clamp: Once your task is complete, rotate the sliding handle counter-clockwise to retract the forcing screw and release the workpiece.
5. Vedligeholdelse
Proper maintenance will extend the life and ensure the reliable performance of your Armstrong 78-403 C-Clamp:
- Rensning: Tør tøjet af efter hver brugamp to remove any dust, debris, or residue. Pay particular attention to the screw threads.
- Smøring: Periodically apply a light coat of machine oil or grease to the forcing screw threads. This prevents rust and ensures smooth operation.
- Inspektion: Efterse regelmæssigt clamp for signs of wear, damage, or deformation. Check for cracks in the frame, bent screws, or damaged swivel pads.
- Opbevaring: Opbevar klamp in a dry environment to prevent corrosion. Avoid storing it in damp eller fugtige forhold.
- Udskiftningsdele: 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 clamp's funktionalitet.
6. Fejlfinding
This section addresses common issues you might encounter with your C-clamp:
| Problem | Mulig årsag | Løsning |
|---|---|---|
| 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. | Afbryd straks brugen. A damaged frame compromises safety and performance. Replace the clamp. |
7. Specifikationer
Detailed specifications for the Armstrong 78-403 C-Clamp:
| Attribut | Værdi |
|---|---|
| Modelnummer | 78-403 |
| Materiale | Legeret stål |
| Maksimal kapacitet | 3 tommer |
| Minimumskapacitet | 0 tommer |
| Depth of Throat (from Center of Screw) | 2-3/4 tommer |
| Trådstørrelse | 1/2-8 |
| Length of Screw | 5-3/4 tommer |
| Minimum Proof Test | 3,500 lbs |
| Slutte | Sort Oxid |
| US Federal Specification | GGG-C-406d |
| Varens vægt | 1.95 pund |
| Produktmål (L x B x H) | 8.25 x 4.5 x 1.5 tommer |
| Replacement Forcing Screw Part No. | 95-458 |
| Replacement Pad Part No. | 95-411 |
8. Garanti og support
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 webwebsted eller produktemballage.
Note: Specifications are subject to change without notice. Always refer to the latest product information from the manufacturer.





