SCREWS FOR FIXING SPECTACLES

and all about screws and screwdrivers

Types of screws, types of screwdrivers, which screws fix spectacles, screws for clocks and watches.

BUY NOW: CLICK ON A PICTURE

 

 

Here are some giant pictures showing you the selection of 1000 screws:
(large picture, please be patient while it loads!)

Buy this item

All screwdrivers and screws



SCROLL DOWN SLIGHTLY FOR AN ARTICLE ABOUT TYPES OF SCREWS


BUY NOW: CLICK ON THE PICTURE

The colours vary from a dark steel colour to a very light (but still steel-like colour), we don't think any of them are made of brass. This photograph makes them appear more 'gold' than they really are, pobably because of the light reflecting off the orange container.

 

SCREWS TYPES

If you thought there were only two types of screwdriver, flat (for slotted screw heads) and cross-head (for Phillips and Pozidriv) - think again! There are ten basic types of screw / screwdriver, and also a dozen different shapes of screw head.

A good place to see pictures and descriptions of each is Wikipedia - and you will also find a summary of the various screw-size-classification systems (Whitworth, BA etc).

For a more technical explanation try the American engineering company Engineering Parts Sourcing Inc: screw point types, hole sizes, head types, screw thread data, metric conversions, screwdriver sizes, or for the geometry of the screw thread try Western Australia's School of Mechanical Engineering.

HEAD TYPES

- Flat-head

Flat screwdrivers (for slotted screw heads) are the most common of all, especially for spectacles and watches. We sell specialist small sets of screwdrivers for very tiny objects - if you want larger screwdrivers go to your local DIY store.

For watchmaking the thickness of the blade should fit the width of the slot exactly. Since you can't buy screwdrivers in different thicknesses, a watchmaker will re-grind the blades. Very 'sharp' blades in very 'wide" slots are very difficult to handle.

- Cross-head

The Phillips screw has slightly rounded corners and is designed so that the screwdriver will slip out ("cam out") under turning-pressure ("torque"). This is to prevent over-tightening. So when customers complain that our screwdrivers are no good because they keep slipping out of the screw - they're meant to!

There are other varieties which do not cam out: the Reed and Prince and the Frearson have 'sharp' crosses and, similarly, the Pozidriv has four extra points which make it star-shaped. Another cross-shape that does not cam out is a BNAE, a tiny screwdriver-head in the form of a 'bit' for a power tool.

- More

The above are those used in clocks, watches and spectacles. There are many more:



CLOCK AND WATCH KEYS (WINDERS) AND HEXAGONAL (HEX)

Old clocks and watches don't have inbuilt winders (they hadn't been invented) - you must wind these with a special square key, and these come in dozens of sizes. In the world of screws they are known as the Robertson design...but we don't actually sell the 'screwdrivers' because the 'screwdriver' (male) is fixed to the clock or watch, and it is the 'screw' (female) that is the winder. We sell these winders in all sizes, both for clocks and for watches.

A variation is a very long blunt screwdriver in the form of a six-pointed star, known as the Torq, which also comes in a 5-pointed-star version (5-part) - these fit many mobile phones.

See all screwdrivers and screws.

 

RELATED ARTICLES (jewellery and horology)

Conversions (ringsizes, finger sizes, winders, weights)

Conversions (clock and watch key winders)

Measuring diamonds

Cleaning, polishing and polishes

Styles of jewellers pliers and cutters

Removing tarnish from silver

Ultrasonic cleaning machines

 

 

 

 


QUICKTEST, Watford, WD18 8PH, Tel. 01923 220206, email info(at)quicktest.co.uk