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Forged C-Clamp with a Tapped Boss and Swivel Pad
DineshAdv at en.wikipedia (Wikimedia Commons) · Public domain
Forge

Created by

Forge

14. October 2026NO
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Forged C-Clamp with a Tapped Boss and Swivel Pad

A C-clamp (or G-clamp) is a C-shaped steel frame with a screw through a threaded hole at one end: the screw presses a swivelling pad against the work, turned by a small bar through its head. Forge the frame from flat bar, tap the boss, thread a rod with the die, and peen a pad onto its tip. The picture: a G-clamp drawing, with its pad, screw and tommy bar.
Intermediate
A day

Instructions

1

Forge the frame

Bend a length of flat bar hot into a deep C. Upset one end into a thick boss and flatten the other into a jaw.

Materials for this step:

Mild Steel Flat BarMild Steel Flat Bar1 piece
CharcoalCharcoal1 as required

Tools needed:

Blacksmith ForgeBlacksmith Forge
AnvilAnvil
Cross Peen HammerCross Peen Hammer
Blacksmith TongsBlacksmith Tongs
Welding GlovesWelding Gloves
Safety GlassesSafety Glasses
2

Drill and tap the boss

File the jaw flat, drill the boss square to it at the tap drill size and tap the thread with oil.

Materials for this step:

Cutting OilCutting Oil0.02 liter

Tools needed:

Metal FileMetal File
Hand DrillHand Drill
Tap and Die SetTap and Die Set
Tap WrenchTap Wrench
Bench ViseBench Vise
3

The screw

Cut a length of rod, thread it with the die, and drill a cross hole through the outer end for a short tommy bar.

Materials for this step:

Mild Steel RodMild Steel Rod0.3 m

Tools needed:

HacksawHacksaw
Tap and Die SetTap and Die Set
Die StockDie Stock
Hand DrillHand Drill
Bench ViseBench Vise
4

Swivel pad

Forge a small disc with a hole, turn a short spigot on the screw tip, fit the disc on it and peen the spigot over loosely so the pad turns freely.

Materials for this step:

Mild Steel Flat BarMild Steel Flat Bar1 piece

Tools needed:

Blacksmith ForgeBlacksmith Forge
Cross Peen HammerCross Peen Hammer
Metal FileMetal File
5

Clamping force

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Materials

4

Tools Required

13

This blueprint makes

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C-Clamp

Free

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