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Like nails, screws are (usually) small pieces of hardware used to hold materials together. One of the main differences is that screws are designed to be able to be removed and replaced easily without damage to the screw itself or the material it connects. Most screws are made from some type of metal, and many are covered in a rustproof coating. Aside from material, screws differ in head shape, head type, threading and purpose.
Machine screws are designed to hold pieces of machinery together. Most machine screws require that the hole already be drilled and threaded, although there are a few types of machine screws capable of tapping their own holes. Like other screws, machine screws are available in a variety of shapes and sizes. Pan head machine screws are machine screws with heads that are flat on top and rounded on the sides. They're similar to oval head machine screws, which also have rounded sides; the difference is that oval head screws have a rounded top, too, as opposed to a flat top, and they have tapered bases. Both are commonly used for metal applications. Pan head machine screws can also be differentiated from flat head screws, which have flat tops, as well. However, flat head screws are tapered on the underside of the head so they can lie flush with the material they're driven into. Meanwhile, round head screws have flat bottoms with rounded heads, much like half a sphere. Round head screws can't sit flush with the material they're driven into; instead, their heads poke out like little bumps.
- Hi in this short video I'm showing how to remove old flat slotted screw from door fixtures. Before you damage the screw completely try this method and i guar.
- One-way screws come in all kinds of different shapes, but they're all used for the same purpose: turning one way and one way only. Typically, these screw drives are designed to fit slotted.
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Pan head machine screws can be designed with a variety of head types, too. A slotted pan head machine screw has a single cut in the head for use with a straight screwdriver. Philips pan head machine screws have a cross cut into the top for use with a Philips screwdriver.
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| 82° Flat Head | 82° Undercut Flat Head | 100° Flat Head | Torx® Drive Flat Head | Square Drive Flat Head | Pozidriv° (Type 1A) Flat Head |
Head Dimensions for 82° Flat Head Machine Screws
ANSI B18.6.3 – 1998
| Nominal Size | A | H | J | T | M | R | N | F | G | Phillips Driver Size | |||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Head Dimensions * | Slot Dimensions | Recess Dimensions | Protusion Above Gaging Diameter | Gaging Diameter | |||||||||||
| Diameter | Height | Width | Depth | Dia | Depth | Width | |||||||||
| Max | Min | Max | Min | Max | Min | Max | Min | Ref | Ref | Ref | Max | Min | |||
| 0 | .112 | .096 | .035 | .026 | .023 | .016 | .015 | .010 | .062 | .035 | .014 | .026 | .016 | .078 | 0 |
| 1 | .137 | .120 | .043 | .033 | .026 | .019 | .019 | .012 | .070 | .043 | .015 | .028 | .016 | .101 | 0 |
| 2 | .162 | .144 | .051 | .040 | .031 | .023 | .023 | .015 | .096 | .055 | .017 | .029 | .017 | .124 | 1 |
| 3 | .187 | .167 | .059 | .047 | .035 | .027 | .027 | .017 | .100 | .060 | .018 | .031 | .018 | .148 | 1 |
| 4 | .212 | .191 | .067 | .055 | .039 | .031 | .030 | .020 | .122 | .081 | .018 | .032 | .019 | .172 | 1 |
| 5 | .237 | .215 | .075 | .062 | .043 | .035 | .034 | .022 | .148 | .074 | .027 | .034 | .020 | .196 | 2 |
| 6 | .262 | .238 | .083 | .069 | .048 | .039 | .038 | .024 | .168 | .094 | .029 | .036 | .021 | .220 | 2 |
| 8 | .312 | .285 | .100 | .084 | .054 | .045 | .045 | .029 | .182 | .110 | .030 | .039 | .023 | .267 | 2 |
| 10 | .362 | .333 | .116 | .098 | .060 | .050 | .053 | .034 | .198 | .124 | .032 | .042 | .025 | .313 | 2 |
| 12 | .412 | .380 | .132 | .112 | .067 | .056 | .060 | .039 | .262 | .144 | .035 | .045 | .027 | .362 | 3 |
| 1/4 | .477 | .442 | .153 | .131 | .075 | .064 | .070 | .046 | .276 | .160 | .036 | .050 | .029 | .424 | 3 |
| 5/16 | .597 | .556 | .191 | .165 | .084 | .072 | .088 | .058 | .358 | .205 | .061 | .057 | .0345 | .539 | 4 |
| 3/8 | .717 | .670 | .230 | .200 | .094 | .081 | .106 | .070 | .386 | .234 | .065 | .065 | .039 | .653 | 4 |
| 1/2 | .815 | .765 | .223 | .186 | .106 | .091 | .103 | .065 | .418 | .265 | .069 | .081 | .049 | .739 | 4 |
| * Edge of head may be rounded or flat. | |||||||||||||||
Head Dimensions for 100° Flat Head Machine Screws
ANSI B18.6.3
| Nominal Size | A | H | J | T | M | R | N | F | G | Phillips Driver Size | |||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Head Dimensions * | Slot Dimensions | Recess Dimensions | Protusion Above Gaging Diameter | Gaging Diameter | |||||||||||
| Diameter | Height | Width | Depth | Dia | Depth | Width | |||||||||
| Max | Min | Max | Min | Max | Min | Max | Min | Ref | Ref | Ref | Max | Min | |||
| 0 | .112 | .095 | .026 | .019 | .023 | .016 | .013 | .008 | .054 | .027 | .013 | .020 | .012 | .074 | 0 |
| 2 | .162 | .142 | .037 | .029 | .031 | .023 | .019 | .012 | .088 | .048 | .012 | .022 | .014 | .121 | 1 |
| 4 | .212 | .188 | .049 | .039 | .039 | .031 | .024 | .017 | .110 | .070 | .018 | .025 | .016 | .167 | 1 |
| 6 | .262 | .235 | .060 | .049 | .048 | .039 | .030 | .022 | .148 | .074 | .027 | .028 | .017 | .214 | 2 |
| 8 | .312 | .282 | .072 | .060 | .054 | .045 | .036 | .027 | .162 | .090 | .028 | .031 | .019 | .261 | 2 |
| 10 | .362 | .329 | .083 | .070 | .060 | .050 | .042 | .031 | .178 | .104 | .030 | .034 | .021 | .307 | 2 |
| 1/4 | .477 | .437 | .110 | .094 | .075 | .064 | .055 | .042 | .240 | .124 | .033 | .040 | .025 | .415 | 3 |
| * Edge of head may be rounded or flat. | |||||||||||||||
Head Dimensions for Undercut Flat Head Machine Screws
ANSI B18.6.3
T Slot Screws For Sale
| Nom Size | L | A | H | J | T | M | R | N | F | G | Phillips Driver Size | |||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| These Lengths or Shorter are Undercut | Head Dimensions * | Slot Dimensions | Recess Dimensions | Protusion Above Gaging Diameter | Gaging Diameter | |||||||||||
| Diameter | Height | Width | Depth | Dia | Depth | Width | ||||||||||
| Max | Min | Max | Min | Max | Min | Max | Min | Ref | Ref | Ref | Max | Min | ||||
| 0 | 1/8 | .112 | .096 | .025 | .018 | .023 | .016 | .011 | .007 | .062 | .035 | .014 | – | – | – | 0 |
| 1 | 1/8 | .137 | .120 | .031 | .023 | .026 | .019 | .014 | .009 | .070 | .043 | .015 | – | – | – | 0 |
| 2 | 1/8 | .162 | .144 | .036 | .028 | .031 | .023 | .016 | .011 | .088 | .048 | .017 | .029 | .017 | .124 | 1 |
| 4 | 3/16 | .212 | .191 | .047 | .038 | .039 | .031 | .022 | .014 | .110 | .070 | .018 | .032 | .019 | .172 | 1 |
| 5 | 3/16 | .237 | .215 | .053 | .043 | .043 | .035 | .024 | .016 | .122 | .081 | .018 | .034 | .020 | .196 | 1 |
| 6 | 3/16 | .262 | .238 | .059 | .048 | .048 | .039 | .027 | .017 | .140 | .066 | .025 | .036 | .021 | .220 | 2 |
| 8 | 1/4 | .312 | .285 | .070 | .058 | .054 | .045 | .032 | .021 | .168 | .094 | .029 | .039 | .023 | .267 | 2 |
| 10 | 5/16 | .362 | .333 | .081 | .068 | .060 | .050 | .037 | .024 | .182 | .110 | .030 | .042 | .025 | .313 | 2 |
| 12 | 3/8 | .412 | .380 | .092 | .078 | .067 | .056 | .043 | .028 | .226 | .110 | .030 | .045 | .027 | .362 | 3 |
| 1/4 | 7/16 | .477 | .442 | .107 | .092 | .075 | .064 | .050 | .032 | .244 | .124 | .032 | .050 | .029 | .424 | 3 |
| 5/16 | 1/2 | .597 | .556 | .134 | .116 | .084 | .072 | .062 | .041 | .310 | .157 | .053 | .057 | .034 | .539 | 4 |
| 3/8 | 9/16 | .717 | .670 | .161 | .140 | .094 | .081 | .075 | .049 | .358 | .205 | .061 | .065 | .039 | .653 | 4 |
| 1/2 | 3/4 | .815 | .765 | .156 | .130 | .106 | .091 | .072 | .046 | .402 | .252 | .068 | .081 | .049 | .739 | 4 |
Head Dimensions for Torx® Drive Flat Head Machine Screws – Camcar
| Nominal Size | G | T | B | F | Max Penetration of “No-Go” Gauge (Fallaway) | Torx® Driver Size | ||
|---|---|---|---|---|---|---|---|---|
| Head Diameter | Head Height | Recess Diameter | Gauge Penetration | |||||
| Max Sharp | Min Sharp | Abs Min | Ref | Ref | Min | |||
| 4 | .225 | .209 | .195 | .067 | .094 | .028 | .019 | T8 |
| 6 | .279 | .257 | .244 | .083 | .111 | .035 | .022 | T10 |
| 8 | .332 | .308 | .292 | .100 | .132 | .040 | .026 | T15 |
| 10 | .385 | .359 | .340 | .116 | .155 | .050 | .031 | T20 |
| 1/4 | .507 | .477 | .452 | .153 | .200 | .075 | .040 | T27 |
| Torx° is a trademark of the Camcar Corporation, division of Textron Industries. | ||||||||
Head Dimensions for Square Socket Flat Head
Machine Screws – IFI
Mont Blanc T Slot Screws
| Nominal Size or Basic Screw Diameter | A | H | M | T | Driver Size | |||||
|---|---|---|---|---|---|---|---|---|---|---|
| Head Diameter | Recess Square | Recess Depth | Recess Penetration Gaging Depth | |||||||
| Max | Min | Max | Min | Max | Min | Max | Min | |||
| 4 | .1120 | .212 | .191 | .071 | .0696 | .073 | .063 | .038 | .032 | 0 |
| 6 | .1380 | .262 | .238 | .091 | .090 | .113 | .105 | .065 | .057 | 1 |
| 8 | .1640 | .312 | .285 | .1126 | .111 | .140 | .119 | .075 | .065 | 2 |
| 10 | .1900 | .362 | .333 | .1126 | .111 | .140 | .119 | .075 | .065 | 2 |
| 12 | .2130 | .412 | .380 | .133 | .1315 | .165 | .155 | .095 | .085 | 3 |
| 1/4 | .2500 | .477 | .442 | .133 | .1315 | .165 | .155 | .095 | .085 | 3 |
| 5/16 | .3125 | .597 | .556 | .191 | .1895 | .201 | .191 | .100 | .090 | 4 |
| This type of recess has a square opening, slightly tapered sides and a conical bottom. | ||||||||||
Head Dimensions for Posidriv® Flat Head Machine Screws
ASME B18.6.3 – 1998
T Slot Screws
| Nominal Size | A | H | M | R | N | Recess Penetration Gaging Depth | F | G | Driver Size | ||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Head Dimensions | Recess Dimensions | Protrusion Above Gaging Diameter | Gaging Diameter | ||||||||||
| Diameter | Height | Dia | Depth | Width | |||||||||
| Max | Min | Max | Min | Ref | Ref | Ref | Max | Min | Max | Min | |||
| 2 | .162 | .144 | .051 | .040 | .096 | .055 | .029 | .053 | .037 | .029 | .017 | .124 | 1 |
| 4 | .212 | .191 | .067 | .055 | .122 | .081 | .030 | .079 | .063 | .032 | .019 | .172 | 1 |
| 6 | .262 | .238 | .083 | .069 | .168 | .098 | .041 | .091 | .073 | .036 | .021 | .220 | 2 |
| 8 | .312 | .285 | .100 | .084 | .182 | .112 | .041 | .107 | .089 | .039 | .023 | .267 | 2 |
| 10 | .362 | .333 | .116 | .098 | .198 | .127 | .041 | .122 | .104 | .042 | .025 | .313 | 2 |
| 12 | .412 | .380 | .132 | .112 | .262 | .149 | .056 | .136 | .118 | .045 | .027 | .362 | 3 |
| 1/4 | .477 | .442 | .153 | .131 | .276 | .164 | .057 | .151 | .133 | .050 | .029 | .424 | 3 |
| 5/16 | .597 | .556 | .191 | .165 | .358 | .211 | .086 | .193 | .175 | .057 | .034 | .539 | 4 |
| 3/8 | .717 | .670 | .230 | .200 | .368 | .239 | .086 | .222 | .204 | .065 | .039 | .653 | 4 |
| Posidriv® is a registered trademark of the Phillips Screw Company. Our fasteners with the “1A-drive” are not manufactured by or connected with the producers of Pozidrive® fasteners. | |||||||||||||
Y Slot Screws
See also:
Slotted Flat Head Cap Screws
Machine Screw Drive Types
Machine Screw Head Styles