Corby bolts - Stainless steel

A precision alternative to traditional hammering rivets: Corby bolts.

In cutlery, the assembly of knife handles is an essential step for aesthetic and handling reasons, but also for robustness. There is no question of the handle breaking or coming apart on impact or stress.
For centuries, knifemakers have used the well-known and still current method of riveting with or without a rosette to steel, brass, copper or stainless steel wire.
To avoid having to use a rosette, male/female knock-in rivets with a large diameter head appeared, requiring know-how and precision in the preparation of the elements to be assembled.
The assembly screws, often aesthetically interesting, require millimetre precision and prior tapping of the plates, the supporting skeleton of the knife.
Corby bolts, of recent conception, represent an advantageous alternative due to their ease of use, a calculated tolerance of the handle thickness and a much greater robustness.

One side screw, one side nut and a large diameter head.

Consisting of two Ø7 mm (0.28in) heads to be screwed onto a Ø5 mm (0.20in) stainless steel shaft, the male part is screwed onto the female part after having first prepared the handle plates.
Corby bolts are easy to use, but require precision and meticulousness in the preparation of the assembly. Designed for a handle thickness of +-25.4 mm (1.0in), some leeway is possible by reducing the height of the screw heads within reasonable proportions.

Principle of use.

The assembly with Corby bolts is done by preparing the parts to be assembled as meticulously as possible.
The final thickness of the handle is a crucial factor.
Two assembly options can be considered:
1) With visible screw indentations to facilitate future disassembly, for example.
2) With grinding of the indentations for a rivet appearance.
Whichever option is chosen, aesthetic criteria play an undeniable role in this choice.
The first operation will be to drill the handle plates to the diameter of the axis of the Corby bolts to be screwed in after having given them the rough shape, preferably.
Once the final thickness of the handle has been determined, the plates will have to be drilled again to make a recess for the Corby bolts heads with a shoulder where they will rest. For this type of procedure, a drill or a milling cutter makes the operation easier.
The rivet heads should be able to turn effortlessly and fit snugly against the handle inserts.

Tip: The diameter of the screw heads can be reduced slightly by mounting the screws on a drill and turning them on a very fine abrasive, under water if necessary.

Careful attention must be paid to the depth of drilling of the rivet housings, as enough material must be left to moderately but firmly tighten the handle while having brought the Corby bolts to be screwed into contact with each other for a perfect lock and hold. A depth drill guide is highly recommended.

All that remains to be done is to cut the screw heads on each side, sand and polish the assembly for a strong and permanent fit.
This practical assembly system allows all types of knife handles up to +-25.4 mm (1.0in) thick to be mounted.

Aesthetic, robust and highly resistant to oxidation.

After sanding and polishing, Corby bolts have the appearance of classic rivets with increased strength to avoid any risk of breakage due to the knife falling, for example.
Corby stainless steel rivets are particularly recommended for the assembly of knives subjected to a hostile or humid environment such as survival equipment, bushcraft or marine environments.

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