What size drywall screws for 1/2 inch drywall?

1-1/4 inch #6 screws, coarse thread on wood studs or fine thread on metal studs. That passes the 1/2 inch board and leaves about 3/4 inch of thread in the stud, which is the standard target. Some installers run 1-5/8 inch on half inch ceilings for extra grip against gravity, and published charts genuinely diverge on that ceiling row, so check the length table before buying.

What size drywall screws for 5/8 inch Type X drywall?

1-5/8 inch on wood studs (1-1/4 inch fine thread on metal studs). Type X is the fire-rated board used on ceilings and garage separations, and the denser core plus extra thickness calls for the longer screw. Zoro's resource guide calls 1-5/8 inch the ceiling specialist length; on 5/8 inch ceilings some charts allow up to 2 inch. Fire-rated assemblies specify their own fasteners, so follow the listed assembly.

What is the difference between coarse and fine thread drywall screws?

Coarse thread (W-type) is for wood studs: deep, widely spaced threads that bite wood fiber. Fine thread (S-type) is for metal studs: closely spaced threads that cut into 20 to 25 gauge steel without stripping. Coarse thread in a metal stud chews the steel and holds nothing; fine thread in wood feels loose. For steel heavier than about 20 gauge you need a fine-thread self-drilling point, which ends in a drill bit tip instead of a sharp point.

What does the gauge number mean on a drywall screw?

The gauge is the screw's shank diameter. The drywall standard is #6 (3.5mm), with #7 (3.9mm), #8 (4.2mm), and #10 (4.8mm) for heavier work. In US screw-gauge terms #6 is 0.138 inch; note the metric 3.5mm and the 0.138 inch gauge numbers are two different size systems that happen to land close together, which is why charts print both.

Why are drywall screws black?

The black finish is phosphate, a dry-to-the-touch interior coating: it resists rust in dry indoor use, and joint compound and paint stick to it. Black phosphate is standard on drywall-to-wood screws. Zinc plating (clear or yellow) marks the fine-thread screws for metal studs and any damper location, because zinc resists corrosion better than phosphate.

Do drywall screws need pilot holes or countersinks?

No. The sharp self-piercing point starts in wood studs without drilling, and the bugle head pulls itself flush with the board face without a countersink; that is the whole design of the head. Two exceptions: a drywall screw into steel is not self-tapping without a fine-thread self-drilling point, and hardwood framing can still split, in which case see a pilot hole chart.

Drywall screw sizes: gauge, length, and thread charts

A drywall screw is a thin, hardened, bugle-head screw built for one job: pinching gypsum board tight to wood or steel framing without tearing the paper face ^[4] ^[8]. Sizes run on three axes that most people conflate. The gauge (#6, #7, #8, #10) is the shank diameter. The length (1 inch to 3 inch) is set by board thickness plus stud penetration. The thread (coarse W-type or fine S-type) is set by the framing material, wood or steel ^[3] ^[10]. This page charts all three from sourced tables, covers the black versus zinc coating question and collated screws for screw guns, and explains why a drywall screw into steel studs is not self-tapping unless it has a drill point, a distinction our self-tapping vs self-drilling screws page owns in full.

The one-minute answer

Most residential hanging is 1/2 inch board on wood studs, and the answer for that is a 1-1/4 inch #6 coarse-thread screw, phosphated black, driven with a #2 Phillips ^[3] ^[9] ^[12]. Three rules cover everything else. Length: board thickness plus 5/8 to 3/4 inch of thread into the stud, which is the penetration every source repeats ^[3] ^[9] ^[13]. Thread: coarse for wood, fine for steel ^[3] ^[7]. Gauge: #6 is the default; #8 shows up in double-layer and heavy work, and #8 should not be used at all into 20-gauge steel studs because the thicker shank strips them ^[3] ^[5].

Drywall screw gauge chart (gauge to diameter, inches and mm)

The gauge number is the screw's diameter, and the drywall industry prints it in both inch-gauge and metric terms. The table below is built from two manufacturer size matrices that agree cell for cell: Sinsun Fastener's drywall screw listings, which pair each metric diameter with its inch equivalent (3.5mm as #6, 3.9mm as #7, 4.2mm as #8, 4.8mm as #10) ^[1] ^[2], and TIMCO's technical data sheets, whose coarse and fine thread ranges are built on the same 3.5 / 4.2 / 4.8mm diameters ^[4] ^[5]. The inch column uses the standard US screw-gauge diameters (#6 = 0.138 in, #8 = 0.164 in), which are close to but not identical with the metric numbers, a divergence we keep visible rather than rounding away.

Drywall screw gauges: shank diameter in mm and inches, with typical use
Gauge	Metric dia.	Inch dia. (US gauge)	Typical use	Sources
#6	3.5mm	0.138 in	The standard. Roughly 80 percent of residential drywall by one maker's count; walls, ceilings, patching	^{[1] [3]}
#7	3.9mm	0.151 in	Bridging size; specified for 5/8 inch board and double-layer work by some charts	^{[1] [3]}
#8	4.2mm	0.164 in	Double-layer soundproofing, commercial fire-rated assemblies, dense hardwood framing	^{[1] [3]}
#10	4.8mm	0.190 in	Heavy and long-work sizes; in TIMCO's range the 4.8mm carries the 100, 125, and 150mm lengths	^{[1] [4]}

Two cautions on this table. First, one widely-copied manufacturer blog (Prince Fastener) publishes a "head diameter" table claiming the head equals the shank diameter per gauge (a #6 head of 3.5mm, and so on). That is self-evidently wrong: a bugle head is roughly twice the shank diameter, and ASTM C1002, the governing standard for gypsum-board screws, requires a head diameter of not less than 0.315 in (8mm) on screws for fastening gypsum board ^[11]. Real examples: TIMCO's 3.5mm screws carry an 8.25mm head ^[4], and Senco's #6 x 1-5/8 in lists a 0.32 in head width ^[9]. Second, a #5 gauge (2.9mm) appears in one maker's torque table ^[12] but in none of the size matrices above, so it is not treated here as a standard drywall gauge; if a supplier sells you "2.9mm drywall screws," treat them as a light specialty size.

The full length matrices behind the gauges: Sinsun lists fine-thread sizes from 3.5 x 13mm (#6 x 1/2 in) up to 4.8 x 152mm (#10 x 6 in) and coarse-thread over the same diameters ^[1] ^[2]; TIMCO's coarse-thread sheet runs 3.5 x 25mm through 4.8 x 150mm with bugle head 8.25mm on the 3.5 and 4.2 gauges ^[4]; its self-drilling fine-thread sheet runs 3.5 x 25mm to 4.8 x 100mm with a No. 2 drill point rated to 3.0mm thick steel ^[5]. Metric 25, 32, 41, and 55mm correspond to the inch 1, 1-1/4, 1-5/8, and 2-1/8 in lengths sold in North America ^[1] ^[3].

Screw length by drywall thickness and application

Length is not about the board alone. Every source in the table below repeats one rule: the screw must pass the board and embed at least 5/8 inch, practically 3/4 inch, into wood framing (about 3/8 inch into steel) ^[3] ^[9] ^[13]. Lituo, which manufactures the screws, reports that below 5/8 inch embedment pull-out strength drops by roughly 40 percent in their lab tests ^[3]. Length equals board thickness plus that bite, which is why the ladder steps the way it does.

Drywall screw length by board thickness and application, wood studs
Board / application	Screw length	Metric	Stud penetration	Sources
1/4 to 3/8 in board, single layer (patch, repair, curved work)	1 in	25mm	about 5/8 in	^{[3] [10] [13]}
1/2 in board, standard residential walls (the workhorse)	1-1/4 in	32mm	about 3/4 in	^{[3] [9] [10] [13]}
1/2 in board on ceilings (extra grip against gravity)	1-5/8 in	41mm	about 1-1/8 in	^{[10] [13]}
5/8 in Type X fire-rated board, walls and ceilings	1-5/8 in	41mm	about 1 in	^{[3] [9] [13]}
5/8 in board on ceilings, extended	1-5/8 to 2 in	41 to 50mm	about 1 to 1-3/8 in	^{[10] [13]}
Double layer (two 1/2 in boards, soundproofing)	1-7/8 to 2 in	48 to 50mm	about 1 in	^{[3] [13]}
Double layer 5/8 in fire assembly	2-1/2 to 3 in	64 to 76mm	about 1-1/4 to 1-3/4 in	^{[13] [14]}

Where the sources genuinely diverge, the table keeps both values instead of averaging them. BuildToolHQ runs the whole ladder one size longer than everyone else (1-1/4 in for 1/4 and 3/8 in board, 1-5/8 in for standard 1/2 in walls, 1-7/8 to 2 in for 5/8 in Type X) on the reasoning that more margin into the stud never hurts ^[14]. Zoro's guide calls 1-1/4 in the industry workhorse for 1/2 in board and 1-5/8 in the ceiling specialist for 5/8 in board ^[9]. On metal studs the same ladder runs shorter, 1 in or 1-1/4 in for 1/2 in board and 1-1/4 in for 5/8 in board, because 3/8 in of steel penetration is the target there ^[10] ^[13]; WhatDrillBit's stud-type matrix carries the same metal-stud column and the ceiling-gets-longer rule ^[15]. Zoro also frames 1-1/4 in on 1/2 in board as about 3/4 in into the stud, the sweet spot that avoids buried electrical wires ^[9].

A spacing note that travels with the length rule: walls are commonly fastened 16 in on center along studs and ceilings 12 in on center, with screws held at least 3/8 in back from panel edges ^[14] ^[13]. Fire-rated (Type X) assemblies specify their own fasteners, spacing, and gauges in the listed assembly; follow that document, which outranks any chart on this page ^[10].

Coarse thread vs fine thread (W vs S)

The thread decision is the one most charts bury, and it decides whether the screw holds at all. Coarse thread, sold as W-type (drywall to wood), has deep, widely spaced threads that bite wood fiber and pull the board tight; fine thread, S-type (drywall to metal), has closely spaced threads that cut into thin sheet steel without tearing the material out around themselves ^[3] ^[7] ^[10]. The failure modes of the mismatch are specific: coarse thread in a 20-gauge steel stud chews the stud and leaves the screw spinning with zero holding power; fine thread in wood can feel tight when driven but works loose, because the shallow threads never engage enough grain ^[3] ^[7].

Steel thickness sorts the fine-thread family further. Standard S-type fine thread with a sharp point is for light-gauge studs, 20 to 25 gauge steel ^[3] ^[7]. Once the steel reaches about 20 gauge or heavier, the screw needs a self-drilling version: TIMCO's PSDR sheet puts a No. 2 drill point on the fine thread, rated to drill steel up to 3.0mm thick, with the twin-fine thread doing the holding after the point drills the hole ^[5]; Albany County Fasteners sells the same idea as Tek-point fine thread for 18 to 25 gauge steel ^[7]. This is the connective fact for readers coming from screw pages: a standard sharp-point drywall screw into steel is not self-tapping. It will not start its own hole in a stud; the drill-point version will. The full taxonomy of self-tapping versus self-drilling points is on our self-tapping vs self-drilling screws page.

Thread counts differ by whose table you read, another honest divergence: Senco's #6 coarse lists 8 TPI in one retailer spec ^[9], BuildToolHQ describes coarse as roughly 6 TPI and fine as roughly 8 TPI ^[10], and Newport Fasteners gives coarse as 8 to 10 TPI and fine as 45 to 50 TPI ^[13]. The direction is consistent (fine is several times tighter than coarse) but the exact counts are not standardized across brands, so treat TPI as approximate and buy by W or S designation.

Into wood, no pilot hole is needed: the sharp point and coarse thread are self-piercing by design, which is the entire point of a drywall screw ^[14] ^[7]. The exceptions (hardwood framing near board edges, or reusing drywall screws as general wood screws) are covered properly in the pilot hole chart, which sizes pilots by gauge and wood density.

Black vs zinc: what the coating means

The color is not cosmetic; it is the corrosion spec. Black drywall screws are phosphate coated, a porous dry-to-the-touch finish: it resists rust in dry interior use, cuts driving friction, and its slightly rough surface takes joint compound and primer, which is why the standard drywall-to-wood W screw is black ^[6] ^[13]. TIMCO plates its coarse-thread (wood) line in black or yellow phosphate and rates it to withstand 50 hours of salt spray per ASTM B117 ^[4]; Sinsun rates its black phosphate at 48 to 72 hours salt spray ^[6].

Zinc plating, clear or yellow, is the marker for the metal-stud line and for damp locations: Senco's DuraSpin fine-thread screws for steel carry zinc ^[9], and fastener guides are blunt that standard black phosphate is for dry interiors only, with zinc, ceramic, or stainless specified for bathrooms, basements, and anything near pressure-treated lumber ^[13] ^[7]. The salt-spray numbers make the tier concrete: phosphate buys dozens of hours of protection, which is plenty behind finished interior walls and not much anywhere wet.

One head-related fact belongs here: the bugle head is shaped to pull itself flush into the paper face without cutting through it, so drywall screws need no countersink ^[10] ^[8]. Driving depth is its own skill (a dimple, not a tear; torn face paper can cost most of the holding power ^[3] ^[14]). If you are countersinking wood screws elsewhere, the countersink size chart covers that; drywall screws themselves never need one.

Collated drywall screws (screw guns)

Collated screws are standard drywall screws joined in plastic strips so an auto-feed screw gun (Senco DuraSpin and the tools that take the same strips: TyRex, Makita, Milwaukee, Grabber, Hilti, PAM) can drive them one after another without handling each screw; strips carry 50 screws, and 1,000-count tubs of twenty strips are the common pack ^[17] ^[16] ^[20]. The sizes mirror the loose screws exactly, because the screws inside the strips are the same screws: Senco's 06A drywall-to-wood collated line is #6 coarse thread, bugle head, #2 Phillips, sharp point, in 1-1/4 and 1-5/8 in with gray phosphate finish ^[16], and #7 x 2 in and #6 x 1-5/8 in are the other common DuraSpin drywall SKUs ^[18]. Everything on this page (gauge, length rule, W vs S, coatings) applies to collated screws unchanged; the only new decision is tool compatibility, since strips are shaped to the gun family ^[17]. Senco's Q collated line for metal substructures up to 3mm steel follows the same pattern in metric sizing, 3.5 x 25 to 3.5 x 45mm, fine thread, phosphated or galvanized ^[19].

What drywall screws are not for

Drywall screws are case-hardened and brittle: strong in withdrawal, weak in shear, and prone to snapping under lateral load. Guides converge on the same prohibition, no drywall screws for framing, decking, or any structural connection ^[14] ^[13]. They are also not wood screws: the head, thread, and hardness are all tuned to gypsum over framing, and the same hardness that lets them self-pierce is what makes them shear. For pilot holes when you do drive screws into wood, see the pilot hole chart; for screw points and the self-tapping taxonomy, self-tapping vs self-drilling screws.

For whether a screw needs a pilot hole and what size: pilot hole chart. For the self-tapping vs self-drilling distinction that governs drywall screws into steel: self-tapping vs self-drilling screws. For countersinking when a screw head does need to sit flush in wood: countersink size chart. For tap drill sizes and machine threads: tap drill chart. For the drill that drives them: drill torque settings. And for hanging things on the finished wall, where the anchor does the holding instead of the screw: wall anchor sizes.

Sources

Sinsun Fastener, Drywall Screw For Drywall product page: full size matrices for wood-stud and metal-stud drywall screws pairing metric and inch designations (3.5mm #6, 3.9mm #7, 4.2mm #8, 4.8mm #10; lengths 3.5 x 13mm #6 x 1/2 in through 4.8 x 152mm #10 x 6 in), ceiling and stud guidance (sinsunfastener.com/drywall-screw-for-drywall-product)
Sinsun Fastener, mild steel gypsum drywall screw and black fine thread drywall screw product pages: fine-thread and coarse-thread size tables over the same gauge-to-metric mapping, 3.5 to 4.8mm diameters (sinsunfastener.com/mild-steel-gypsum-drywall-screw-product; sinsunfastener.com/ig/black-fine-thread-drywall-screw-product)
Lituo Fasteners (tjlituo.com), Drywall Screw Size Chart: manufacturer's application table (1/4 to 3/8 in board = 1 in #6; 1/2 in = 1-1/4 in #6; 5/8 in = 1-5/8 in #6 or #7; double layer = 1-7/8 to 2 in #7 or #8; heavy duty 2-1/4 to 3 in #8), gauge table (#6 3.5mm, #8 4.2mm), 5/8 to 3/4 in embedment rule, lab pull-out claim (40 percent loss below 5/8 in), coarse W vs fine S explanations, 20-25 gauge fine-thread range, #8 warning for 20-ga studs, ASTM C1002 compliance (tjlituo.com/drywall-screw-size-chart/)
TIMCO, Technical Data Sheet, coarse thread drywall screws (DRYC): full size matrix 3.5 x 25mm through 4.8 x 150mm with bugle head diameter 8.25mm on 3.5 and 4.2mm shanks and 8.75mm on 4.8mm, PH2 recess, 25 degree super sharp point, black or yellow phosphate to 50 hr salt spray ASTM B117, fully threaded to 50mm, C10-18 steel (timco.co.uk TDS via tcfixings.co.uk mirror PDF)
TIMCO, Technical Data Sheet, self-drilling drywall screws (PSDR): fine twin thread for steel sections, No. 2 drill point rated to 3.0mm steel thickness, bugle head, fully threaded to 50mm, size range 3.5 x 25mm through 4.8 x 100mm (timco.co.uk tds-drywall-screws-psdd.pdf)
Sinsun Hardware / Sinsun Fastener, gypsum board screw product pages: black phosphate standard, C1022A carbon steel, HRC 48-53, 48-72 hr salt spray, fine thread for metal studs and coarse for wood studs, Phillips/Pozi/Torx (sinsunhardware.com/gypsum-board-screw-product; sinsunfastener.com/self-tapping-screws-product)
Albany County Fasteners, Fasteners 101 Drywall Screw Guide: coarse thread for wood, fine thread (Type S, 20-24 TPI) self-tapping into 20-25 gauge steel, self-drilling Tek point for 18-25 gauge, trim head variant, bugle head countersinks flush without tearing paper (albanycountyfasteners.com/fasteners-101-drywall-screw-information)
Newport Fasteners blog quote page on what makes a drywall screw different: bugle head countersinks flush without breaking paper facing, sharp point eliminates pilot holes, black phosphate standard (via buildtoolhq.com/post/drywall-screw-size-chart-guide context and newportfasteners.com/blog/post/drywall-screws-guide)
Zoro, Drywall Screw Size Chart resource guide: 1-1/4 in as the industry workhorse for 1/2 in board on wood studs with about 3/4 in stud penetration, 1-5/8 in as the ceiling specialist for 5/8 in board, coarse for wood studs, fine self-tapping for metal studs, 20-gauge cold-rolled steel framing context (zoro.com/resourcehub/drywall-screw-size-chart/)
Senco 06A162P listing at Zoro: #6 x 1-5/8 in drywall-to-wood screw, coarse thread, 8 TPI, bugle head, phosphate finish, PH2, head width 0.32 in, ASTM C1002 Type W, pointed tip (zoro.com/senco-screws-1-58-in-pk1000-06a162p); Senco 08C300WK #8 x 3 in fine self-drilling, zinc yellow, head dia 0.315 in (zoro.com G2390915)
ASTM C1002, Standard Specification for Steel Self-Piercing Tapping Screws for Fastening Gypsum Panel Products: head diameter not less than 0.315 in (8mm) for gypsum-board screws, No. 2 Phillips recess depth not less than 0.104 in, head contour able to rest below panel surface (astm.org/c1002-22.html; C1002-14 text)
Prince Fastener, Drywall Screw Selection Guide and #6 Screw Size Guide: torque table listing #5 (2.9mm) through #10 gauges; head-diameter table claiming head equals shank per gauge, contradicted by ASTM C1002 minimum (princefastener.com/drywall-screw-selection-guide/; princefastener.com/6-screw-size-guide-length-thread-material-selection/)
Newport Fasteners, Drywall Screws Guide: length chart with 5/8 in wood / 3/8 in steel penetration minimums (IRC requirement), W-type 8-10 TPI and S-type 45-50 TPI, thread table incl. S-12 drill point for 18ga+ steel, black phosphate indoor only with zinc/stainless/ ceramic for moisture, no structural use (newportfasteners.com/blog/post/drywall-screws-guide)
BuildToolHQ, Drywall Screw Size Chart guide and Screw Size Chart: length table (1/4 and 3/8 in board = 1-1/4 in; 1/2 in = 1-5/8 in; 5/8 in Type X = 1-7/8 to 2 in; double 1/2 in = 2-1/4 to 2-1/2 in), wall 16 in / ceiling 12 in spacing, 3/8 in edge distance, no pilot needed for W-type, torn-paper holding loss, no structural use (buildtoolhq.com/post/drywall-screw-size-chart-guide)
WhatDrillBit drywall screw size chart: board-thickness by stud-type length matrix incl. ceiling rows, 5/8 in wood vs 3/8 in steel bite rule, #6 standard gauge, bugle head self-countersinks flush (whatdrillbit.com/drywall-screw-size-chart)
Senco DuraSpin collated screws at juldan.com: 06A series #6 coarse bugle PH2 sharp point in 1-1/4 and 1-5/8 in gray phosphate; strips fit Senco, TyRex, Makita, Milwaukee, Grabber, Hilti, PAM drivers; 50 screws per strip; fine-thread gray phosphate for light steel, clear zinc fine drill-point for heavy steel (juldan.com/fast-screw.html); Senco 06A162P listing details (gistgear.com)
Collated screw retail listings: 1000-count #6 x 1-1/4 in drywall-to-wood collated screws in 20 strips of 50 with black phosphate finish and storage bucket (cherrypicksreviews.com/collated-screws; top5best.com/collated-screws)
Senco DuraSpin collated drywall SKUs: 06A125P #6 x 1-1/4 in, 06A162P #6 x 1-5/8 in, 07A200P #7 x 2 in, 1000 per box (top5best.com/collated-screws)
Senco collated Q screws for metal substructures up to 3mm: trumpet (bugle) head, fine thread, 3.5 x 25 to 3.5 x 45mm, phosphated or galvanized, for DuraSpin drivers (margreiter-technik.com Senco collated screws Q)
Screwboltsize.com, Drywall Screw Size Guide: anatomy (bugle head, W ~6 TPI vs S ~8 TPI approximations, sharp self-starting tip, fine-thread S self-drilling), embedment rule 5/8 in min 3/4 in practical, ceiling one-size-longer rule, length table incl. double-layer rows (screwboltsize.com/articles/drywall-screw-size-guide.html)