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8/4/2019 Screw Head Types
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Screw Head Types - A Guide to What Type of Screw is This?
At Tanner Bolt & Not, we field a lot of calls from customers
trying to find the right bit or screwtype.
To help, we prepared this guide to screw head types and
drives.
Click on the image that looks most like the top of the screwhead
to see the bit you need.
Always use the right driver for the screwhead you are working
on. I know some of these look the
same (can you tell the difference between a Pozidriv and a
Phillips from 10 feet away?) but theyare not - and you risk
damaging the screw and ending up taking a lot of time to extract it
if it gets
damaged.
Slotted
This is the original screw drive. You find these everywhere,
though the practice
of using screws with slotted drives is on the decline because
the screwdriver slipsout of the slot, particularly when you are
applying heavy torque to really tighten down (or
loosen, for that matter) these types of screws.
Phillips
This screw drive type is very popular - and again, you find them
in a very wide
range of applications. Common sizes are Phillips #1, #2 and #3.
The mostcommon Phillips size is #2.
See our availablePhillips bits
Phillips Tamper-resistant
Not very common, but when you need one, you need one. Same shape
and sizing
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rbolt.com/articles/what-type-of-screw-is-this/http://resources.tannerbolt.com/articles/what-type-of-screw-is-this/http://resources.tannerbolt.com/articles/what-type-of-screw-is-this/http://resources.tannerbolt.com/articles/what-type-of-screw-is-this/http://resources.tannerbolt.com/articles/what-type-of-screw-is-this/http://resources.tannerbolt.com/articles/what-type-of-screw-is-this/http://resources.tannerbolt.com/articles/what-type-of-screw-is-this/http://resources.tannerbolt.com/articles/what-type-of-screw-is-this/http://resources.tannerbolt.com/articles/what-type-of-screw-is-this/http://www.tannerbolt.com/products/POWER%20TOOLS/05@@2e%20SCREWDRIVING%20BITSACCESSORIES/01@@2e%20APEX%20SCREWDRIVING%20BITS/1490@@2e%2014%20HEX%20INSERT%20BITS.aspx
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as Phillips, but the screw includes a tamper-resistant pin in
the middle. This screw is not used in
high torque applications as the design is not very strong and
the bits cannot be manufactured tohigh strength specifications.
Quadrex
A combined Phillips and square recess drive.
Pozidriv
This screwhead isnt seen very often in the U.S.A., though it is
very common in
Europe. It looks a lot like a Phillips screwhead, but it
includes 4 more contactpoints. Common sizes are Pozidriv #1, #2 and
#3.
Square Recess
Square recess are being used more and more as they are very
resistant to cam-
out, which is a fancy way of saying the tip of the tool does not
slip out and marthe screwhead very easily. Commonly found in two
sizes: Square #2 and #3.
See our availablesquare recess bits
Square Recess Tamper-resistant
Same design and sizing as square recess, but includes a centered
tamper-resistant
pin.
TORX
TORX, the funny looking screw drive. Well, you see them in a lot
of electronics
here in the US, and they are gaining ground in a variety of ther
applications.
They range in size from T5 through T55 in 1/4 insert bits and
powerdrive bits.
http://www.tannerbolt.com/products/POWER%20TOOLS/05@@2e%20SCREWDRIVING%20BITSACCESSORIES/01@@2e%20APEX%20SCREWDRIVING%20BITS/05@@2e%2014%20SQUARE%20RECESS%20BITS.aspxhttp://www.tannerbolt.com/products/POWER%20TOOLS/05@@2e%20SCREWDRIVING%20BITSACCESSORIES/01@@2e%20APEX%20SCREWDRIVING%20BITS/05@@2e%2014%20SQUARE%20RECESS%20BITS.aspxhttp://www.tannerbolt.com/products/POWER%20TOOLS/05@@2e%20SCREWDRIVING%20BITSACCESSORIES/01@@2e%20APEX%20SCREWDRIVING%20BITS/05@@2e%2014%20SQUARE%20RECESS%20BITS.aspxhttp://www.tannerbolt.com/products/Power%20Tools/05@@2e%20Screwdriving%20Bits@@2fAccessories/01@@2e%20Apex%20Screwdriving%20Bits/05@@2e%201@@2f4@@22%20Square%20Recess%20Bits.aspxhttp://www.tannerbolt.com/products/Power%20Tools/05@@2e%20Screwdriving%20Bits@@2fAccessories/01@@2e%20Apex%20Screwdriving%20Bits/05@@2e%201@@2f4@@22%20Square%20Recess%20Bits.aspxhttp://www.tannerbolt.com/products/Power%20Tools/05@@2e%20Screwdriving%20Bits@@2fAccessories/01@@2e%20Apex%20Screwdriving%20Bits/05@@2e%201@@2f4@@22%20Square%20Recess%20Bits.aspxhttp://www.tannerbolt.com/products/Power%20Tools/05@@2e%20Screwdriving%20Bits@@2fAccessories/01@@2e%20Apex%20Screwdriving%20Bits/05@@2e%201@@2f4@@22%20Square%20Recess%20Bits.aspxhttp://www.tannerbolt.com/products/Power%20Tools/05@@2e%20Screwdriving%20Bits@@2fAccessories/01@@2e%20Apex%20Screwdriving%20Bits/05@@2e%201@@2f4@@22%20Square%20Recess%20Bits.aspxhttp://www.tannerbolt.com/products/Power%20Tools/05@@2e%20Screwdriving%20Bits@@2fAccessories/01@@2e%20Apex%20Screwdriving%20Bits/05@@2e%201@@2f4@@22%20Square%20Recess%20Bits.aspxhttp://www.tannerbolt.com/products/Power%20Tools/05@@2e%20Screwdriving%20Bits@@2fAccessories/01@@2e%20Apex%20Screwdriving%20Bits/05@@2e%201@@2f4@@22%20Square%20Recess%20Bits.aspxhttp://www.tannerbolt.com/products/Power%20Tools/05@@2e%20Screwdriving%20Bits@@2fAccessories/01@@2e%20Apex%20Screwdriving%20Bits/05@@2e%201@@2f4@@22%20Square%20Recess%20Bits.aspxhttp://www.tannerbolt.com/products/Power%20Tools/05@@2e%20Screwdriving%20Bits@@2fAccessories/01@@2e%20Apex%20Screwdriving%20Bits/05@@2e%201@@2f4@@22%20Square%20Recess%20Bits.aspxhttp://www.tannerbolt.com/products/Power%20Tools/05@@2e%20Screwdriving%20Bits@@2fAccessories/01@@2e%20Apex%20Screwdriving%20Bits/05@@2e%201@@2f4@@22%20Square%20Recess%20Bits.aspxhttp://www.tannerbolt.com/products/POWER%20TOOLS/05@@2e%20SCREWDRIVING%20BITSACCESSORIES/01@@2e%20APEX%20SCREWDRIVING%20BITS/05@@2e%2014%20SQUARE%20RECESS%20BITS.aspx
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Tamper-resistant TORX
Tamper-resistant TORX has a small post in the middle of the
drive that preventsa regular TORX driver from working.
See our availableTorx tamper resistant bits
TORX Plus
TORX Plus is an enhanced TORX design that allows more contact
area between
the driver and the screwhead allowing more torque to be applied,
even at high
driving speeds. This is a fairly new design.
Tamper-resistant TORX Plus
Tamper-resistant TORX Plus is a licensed design, only available
after thepurchaser has completed paperwork indicating their
authorization to purchase
these bits. This design is used extensively in correctional
facilities and in other high-security
applications. It is different than the usual TORX Plus because
it uses only a FIVE lobe design,with a center pin. We can assist
you in obtaining TORX Plus tamper-resistant bits -please followthe
directions on this page.
Tamper-resistant Hex
The tools to access tamper-resistant hex are limited from
general distribution in
order to protect equipment from access by end-users. Similar to
tamper-resistant
TORX, there is a small metal post in the middle of the screwhead
that prevents a normal hex
driver from engaging. Tamper-resistant hex come commonly in the
following fractional sizes:1/8,3/32, 3/16,1/4 and 5/16
See our availablehex tamper resistant bits
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8/4/2019 Screw Head Types
4/4
Tri-Wing
This unusual three-leg design of the Tri-Wing comes in 3 sizes:
#1, #2, #3. We dont see these
too often, though they are available as part of our Master
Security Bit Kit.
See our availableTri-Wing bits
Spanner
Sometimes also known as snake eyes and notched. Though our
diagram shows two holes inthe top of the screw, these sometimes
also look like a screw with two notches cut into the edge
on opposing sides of the screw. A commonly used screwhead to
avoid tampering, weve seen
these used in everything from electronics to bathroom stall
doors in public restrooms! Comes in6 common sizes: #4, #6, #8, #10,
#12 and #14.
See our availablespanner bits
One Way removal tool
This is a specialized application for sure. A one way screw is
installed using a slotted bit - but
since the edges of the slot are ramped in the opposite
direction, a slotted bit will not engage toremove the screw. These
one of a kind removal bits can be adjusted to fit one-way screws
and
back them out.
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