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John Adams took these pictures of a GR 810, with a background grid formed of quarter inch squares.

• handle of stopped spindle ,
• handle of through spindle ,
• ends spindles ,
• threads on spindle (TBS), and
• maker's marks.

Note that Grand Rapids Hand Screw Company used the following terminology for parts:

Grand Rapids Hand Screw Company

Peculiarities of Grand Rapids Hand Screw Clamps

The company continually emphasized that

In every other Hand Screw the thread is cut with a V shaped tool. In ours we cut it with a saw. The V tool strains and weakens the wood in cutting. Our patent process leaves the wood solid.

The woods were second growth hickory for the spindles, hard maple and birch for the jaws.

There is a prominent warning in several catalogs that

Our Hand Screw parts are not interchangeable with any other make.

Spindles

The woods were second growth hickory for the spindles.

Handle of stopped spindle

Note the slight taper to the cylinder.

Handle of through spindle

Note the pronounced waist.

Ends of spindles

The end of the through spindle is rounded. Note the lathe marks.

threads on spindle

Not available at this time.

Maker's Mark

The maker's mark has several forms

1. Grand Rapids HAND SCREW CO in a circle. and
2. G. R. HAND SCREW CO in one line by itself.

I believe the latter mark is the later mark.

Circular form

The image on the left shows the typical name on the outside, and model number inside.

One Line form

This image shows the common abbreviation GR for Grand Rapids.

Labels

No labels are known.

Jaws

The woods were hard maple and birch for the jaws.

last revised and validated

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