Sizing
Choosing the Proper Sizes:
IF YOUR SCREWS ARE MADE OF HARDENED STEEL, YOU MUST USE LARGER SIZED UNSCREW-UMS AS DIRECTED IN THE TABLE BELOW - See ** !
Determine the wire size of your screws and refer to Fig. 1 and our table below to determine the sizes you need, or send us samples of your screws in a padded mailer.
- If the slot is badly damaged, remove the head with a twist drill or make a deep pilot hole in the head and cut through the rest of the head with an UNSCREW-UMS™.
- When the shank is exposed, select the proper-sized UNSCREW-UMS™ from the Shank colum in the table below (see Fig. 2).
- When dealing only with the threaded portion of the screw, select the proper-sized UNSCREW-UMS™ from the Thread column in the table below (see Fig. 3).
- Any screw flush with the top of the wood should be beveled with an UNSCREW-UMS™ one size larger than the one you select to remove the screw, or a guide block should be used to steady the UNSCREW-UMS™ at the start.
Recommended UNSCREW-UMS™ for Common Screw Sizes
|
UNSCREW-UMS™ Outside Diameter |
Shank (Fig. 1B) |
Thread (Fig. 1C) |
Length Available* |
|
-- |
#2 |
1" |
|
|
#2 |
#4 |
1 3/8” |
|
|
#4 |
#6 ** |
2” |
|
|
#6 |
#8 ** |
2” & 2 1/2” |
|
|
#8 |
#10 ** |
2” & 2 1/2” |
|
|
#10 |
#12** |
2” & 3” |
|
|
#12,14 |
#14,16,18** |
2” & 3 1/2” |
|
|
#14,16,18 |
#16,18,20** |
2” & 4” |
|
|
#16,18,20 |
#20** |
2” & 4” |
|
|
-- |
-- |
2” & 4” |
|
|
-- |
-- |
2” & 4” |
* Long UNSCREW-UMS™ tend to distort more easily and should be used ONLY when reaching through planking thicker than 1” or when removing very long fasteners (e.g. 4” +).
** For HARDENED SCREWS of this wire size, use an UNSCREW-UMS™ which has a 1/16" larger O.D. than that shown.