Oval Head Screws Manufacturer in India | Raised Countersunk Screws

Overview

Raised Countersunk Screws & Oval Head Wood Screws: Manufacturer & Stockist

An oval head screw is a countersunk screw with a raised, domed top. The cone centres the screw and sits in the countersink; the dome gives a finished look and leaves room for a deeper slot or recess.

Exotic Alloy manufactures oval head screws in Mumbai, India, for hardware, furniture, boat-fitting, electrical and appliance makers. We stock across India and supply Thailand, South-East Asia, the Gulf and Europe. Heads are cold formed with the slot or cross recess, and threads are rolled.

Three families, one head shape

Inch oval head machine screws follow ASME B18.6.3 with an 82° head. Metric raised countersunk screws follow ISO 2010 (slotted, formerly DIN 964) and ISO 7047 (cross recessed, formerly DIN 966) with a 90° head. Oval head wood screws follow DIN 95 and DIN 7995. For a flush finish, see flat head and countersunk screws.

ASME B18.6.3 ISO 2010 / ISO 7047 DIN 95 / DIN 7995 Slotted & cross Stainless & brass

Oval head screw at a glance

Head: Countersunk cone with a raised dome
Angle: 82° inch (ASME); 90° ISO metric
Length: From the head edge; dome not included
Drive: Slotted, Phillips (H) or Pozidriv (Z)
Materials: A2, A4, brass, plated steel
Related: Flat head, round head, wood screws

No. 10 slotted oval head machine screw, section drawn to scale from the ASME B18.6.3 maximum dimensions (inches). With the 82° countersink cut to the gaging diameter G, the top of the head stands F above the surface; threads simplified.

Specification

Oval Head Screw Specification

The range we manufacture and supply.

StandardsASME B18.6.3; ISO 2010 (ex DIN 964); ISO 7047 (ex DIN 966); DIN 95; DIN 7995

Size rangeNo. 0 to 1/2″; M1.6–M10; wood screws 1.6–8 mm

Lengths1/8″ to 3″ and 3–80 mm; longer to order

ThreadUNC / UNF; metric coarse 6g; wood screw thread with gimlet point

DriveSlotted; Phillips (type H); Pozidriv (type Z)

Countersink82° inch heads; 90° ISO metric heads

MaterialsA2 (304) and A4 (316) stainless, brass, low-carbon steel

FinishPlain or passivated stainless; plain, nickel or chrome brass; zinc, nickel or chrome steel

CertificationMill certificate; EN 10204 3.1; PMI for stainless

PackingBoxes of 100 to 1000, bulk cartons, kits with cup washers to order

Head types

Oval Head vs Flat, Metric Raised & Round Heads

The oval head sits between the flush flat head and the fully exposed round head.

No. 10 inch heads and an M5 metric head at the same scale, from ASME B18.6.3 and ISO 7047; the oval and flat heads share the same countersunk cone. Outlines simplified.

Size	Head dia. A max	Oval total O max	Flat height H max	Slot depth T oval / flat, max	Protrusion F oval / flat, max
No. 0	.112	.056	.035	.030 / .015	.047 / .026
No. 1	.137	.068	.043	.038 / .019	.053 / .028
No. 2	.162	.080	.051	.045 / .023	.058 / .029
No. 3	.187	.092	.059	.052 / .027	.064 / .031
No. 4	.212	.104	.067	.059 / .030	.069 / .032
No. 5	.237	.116	.075	.067 / .034	.075 / .034
No. 6	.262	.128	.083	.074 / .038	.080 / .036
No. 8	.312	.152	.100	.088 / .045	.091 / .039
No. 10	.362	.176	.116	.103 / .053	.102 / .042
No. 12	.412	.200	.132	.117 / .060	.113 / .045
1/4″	.477	.232	.153	.136 / .070	.129 / .050
5/16″	.597	.290	.191	.171 / .088	.155 / .057
3/8″	.717	.347	.230	.206 / .106	.182 / .065
1/2″	.815	.354	.223	.216 / .103	.212 / .081

Maximum values, inches, ASME B18.6.3. The two heads have the same diameter and countersunk height; the oval head adds the dome and a deeper slot.

Dimensions

Oval Head Screw Dimensions

The twelve DIN 95 oval head wood screw sizes at the same scale (the type in our photo), top view and side profile; outlines simplified.

Size	A head dia. max / min	H side max	O total max	Raise O−H our calc.	J slot width max / min	T slot depth max / min
No. 0	.112 / .096	.035	.056	.021	.023 / .016	.030 / .025
No. 1	.137 / .120	.043	.068	.025	.026 / .019	.038 / .031
No. 2	.162 / .144	.051	.080	.029	.031 / .023	.045 / .037
No. 3	.187 / .167	.059	.092	.033	.035 / .027	.052 / .043
No. 4	.212 / .191	.067	.104	.037	.039 / .031	.059 / .049
No. 5	.237 / .215	.075	.116	.041	.043 / .035	.067 / .055
No. 6	.262 / .238	.083	.128	.045	.048 / .039	.074 / .060
No. 8	.312 / .285	.100	.152	.052	.054 / .045	.088 / .072
No. 10	.362 / .333	.116	.176	.060	.060 / .050	.103 / .084
No. 12	.412 / .380	.132	.200	.068	.067 / .056	.117 / .096
1/4″	.477 / .442	.153	.232	.079	.075 / .064	.136 / .112
5/16″	.597 / .556	.191	.290	.099	.084 / .072	.171 / .141
3/8″	.717 / .670	.230	.347	.117	.094 / .081	.206 / .170
7/16″	.760 / .715	.223	.345	.122	.094 / .081	.210 / .174
1/2″	.815 / .765	.223	.354	.131	.106 / .091	.216 / .176

ASME B18.6.3 oval heads for machine screws, slotted, inches. H is the countersunk (side) height, O the total height; the raise is our subtraction.

Size	M recess dia. ref	R recess depth ref	N recess width ref	Phillips driver	Threads UNC / UNF
No. 0	.068	.036	.014	PH 0	80 (UNF only)
No. 1	.070	.039	.015	PH 0	64 / 72
No. 2	.106	.060	.018	PH 1	56 / 64
No. 3	.118	.072	.019	PH 1	48 / 56
No. 4	.130	.086	.019	PH 1	40 / 48
No. 5	.152	.073	.028	PH 2	40 / 44
No. 6	.172	.092	.030	PH 2	32 / 40
No. 8	.186	.107	.031	PH 2	32 / 36
No. 10	.202	.125	.033	PH 2	24 / 32
No. 12	.264	.140	.038	PH 3	24 / 28
1/4″	.284	.160	.040	PH 3	20 / 28
5/16″	.384	.226	.065	PH 4	18 / 24
3/8″	.404	.245	.068	PH 4	16 / 24
7/16″	.416	.257	.070	PH 4	14 / 20
1/2″	.430	.271	.071	PH 4	13 / 20

ASME B18.6.3 oval heads with Phillips recess, reference recess dimensions, inches. Head dimensions are as for the slotted head.

Size	P	d_k theor. max	d_k actual max / min	k max	f ≈ raise	r_f ≈ oval radius	t slot min (ISO 2010)	Recess ISO 7047	m ≈ H / Z
M1.6	0.35	3.6	3 / 2.7	1	0.4	3	0.65	0	1.9 / 1.9
M2	0.4	4.4	3.8 / 3.5	1.2	0.5	4	0.8	0	2 / 2.2
M2.5	0.45	5.5	4.7 / 4.4	1.5	0.6	5	1	1	3 / 2.8
M3	0.5	6.3	5.5 / 5.2	1.65	0.7	6	1.2	1	3.4 / 3.1
M3.5	0.6	8.2	7.3 / 6.94	2.35	0.8	8.5	1.4	2	4.8 / 4.6
M4	0.7	9.4	8.4 / 8.04	2.7	1	9.5	1.6	2	5.2 / 5
M5	0.8	10.4	9.3 / 8.94	2.7	1.2	9.5	2	2	5.4 / 5.3
M6	1	12.6	11.3 / 10.87	3.3	1.4	12	2.4	3	7.3 / 7.1
M8	1.25	17.3	15.8 / 15.37	4.65	2	16.5	3.2	4	9.6 / 9.5
M10	1.5	20	18.3 / 17.78	5	2.3	19.5	3.8	4	10.4 / 10.3

ISO 2010 (slotted) and ISO 7047 (cross recessed) raised countersunk head screws, product grade A, mm. The theoretical diameter is the sharp-edged 90° cone; the actual head edge is smaller. H = Phillips, Z = Pozidriv.

Thread d	d_k nom	k max	f ≈ raise	n slot nom	t slot min / max
1.6	3	0.96	0.4	0.4	0.65 / 0.8
2	3.8	1.2	0.5	0.5	0.8 / 1
2.5	4.7	1.5	0.6	0.6	1 / 1.2
3	5.6	1.65	0.75	0.8	1.2 / 1.45
3.5	6.5	1.93	0.9	0.8	1.4 / 1.7
4	7.5	2.2	1	1	1.6 / 1.9
4.5	8.3	2.35	1.1	1	1.8 / 2.1
5	9.2	2.5	1.25	1.2	2 / 2.3
5.5	10.2	2.75	1.4	1.2	2.2 / 2.5
6	11	3	1.5	1.6	2.4 / 2.8
7	12.5	3.5	1.8	2	2.8 / 3.2
8	14.5	4	2	2	3.2 / 3.7

DIN 95:2016 slotted raised countersunk (oval) head wood screws, mm.

Thread d	d_k nom	k max	Cross recess size	m ≈ H / Z
2	3.8	1.2	0	–
2.5	4.7	1.5	1	2.7 / 2.8
3	5.6	1.65	1	3.1 / 3.1
3.5	6.5	1.93	2	4.2 / 4.3
4	7.5	2.2	2	4.5 / 4.6
4.5	8.3	2.35	2	5 / 5.1
5	9.2	2.5	2	5.3 / 5.3
5.5	10.2	2.75	3	7.1 / 6.6
6	11	3	3	7.4 / 7
7	12.5	3.5	3	8.3 / 8
8	14 (2010: 14.5)	4	4	9 / 8.8

DIN 7995:2016 cross recessed raised countersunk head wood screws, mm. For size 8, the 2016 edition lists d_k 14 mm and the 2010 edition and DIN 95 list 14.5 mm; we confirm the value on your drawing.

Countersinks

Countersinking for Oval Head Screws

Match the countersink to the head: 82° for inch screws, 90° for ISO metric screws. With the wrong tool the head touches only at its edge or near the shank, so it can tilt, loosen or mark the part.

ASME B18.6.3 checks the head with a gauge: when the countersink diameter at the surface is the gaging diameter G, the top of the head stands F above it. The oval head protrudes about 0.02–0.13″ more than the flat head, from No. 0 to 1/2″: that is the dome.

Size	G gaging dia.	F oval head max / min	F flat head max / min
No. 0	.078	.047 / .031	.026 / .016
No. 1	.101	.053 / .035	.028 / .016
No. 2	.124	.058 / .039	.029 / .017
No. 3	.148	.064 / .044	.031 / .018
No. 4	.172	.069 / .048	.032 / .019
No. 5	.196	.075 / .053	.034 / .020
No. 6	.220	.080 / .057	.036 / .021
No. 8	.267	.091 / .066	.039 / .023
No. 10	.313	.102 / .075	.042 / .025
No. 12	.362	.113 / .084	.045 / .027
1/4″	.424	.129 / .095	.050 / .029
5/16″	.539	.155 / .117	.057 / .034
3/8″	.653	.182 / .139	.065 / .039
7/16″	.690	.195 / .150	–
1/2″	.739	.212 / .163	.081 / .049

ASME B18.6.3 protrusion gauging for 82° heads, inches (no flat head value is listed for 7/16″).

Tap drills

Threads & Tap Drills for Oval Head Machine Screws

UNC and UNF threads for every inch size, with the drill for about 75 % thread. No. 0 is made in UNF only.

Size	Thread	Tap drill 75 % thread	Thread	Tap drill 75 % thread
No. 0	–	–	#0-80	3/64″ (0.0469″)
No. 1	#1-64	#53 (0.0595″)	#1-72	#53 (0.0595″)
No. 2	#2-56	#50 (0.0700″)	#2-64	#50 (0.0700″)
No. 3	#3-48	#47 (0.0785″)	#3-56	#45 (0.0820″)
No. 4	#4-40	#43 (0.0890″)	#4-48	#42 (0.0935″)
No. 5	#5-40	#38 (0.1015″)	#5-44	#37 (0.1040″)
No. 6	#6-32	#36 (0.1065″)	#6-40	#33 (0.1130″)
No. 8	#8-32	#29 (0.1360″)	#8-36	#29 (0.1360″)
No. 10	#10-24	#25 (0.1495″)	#10-32	#21 (0.1590″)
No. 12	#12-24	#16 (0.1770″)	#12-28	#14 (0.1820″)
1/4″	1/4-20	#7 (0.2010″)	1/4-28	#3 (0.2130″)
5/16″	5/16-18	F (0.2570″)	5/16-24	I (0.2720″)
3/8″	3/8-16	5/16″ (0.3125″)	3/8-24	Q (0.3320″)
7/16″	7/16-14	U (0.3680″)	7/16-20	25/64″ (0.3906″)
1/2″	1/2-13	27/64″ (0.4219″)	1/2-20	29/64″ (0.4531″)

Number, letter and fractional drills with their diameters in inches.

Calculator

Oval Head Countersink & Protrusion Calculator

Enter the countersink diameter at the surface and the panel thickness. The calculator shows how far the head will stand above the surface and how deep the 82° countersink goes.

Screw & countersink

Size

Thread

Countersink dia., in

Panel thickness, in

Our calculation from the ASME B18.6.3 gauge values: protrusion = F − (countersink dia. − G) ÷ (2 tan 41°). The countersink diameter resets to the maximum head diameter when you change size.

Result

0.074

in, max above surface

1.87

mm, max above surface

Protrusion range:0.047–0.074″

Depth, 82°:0.099″ (2.51 mm)

Head dia. A:0.333–0.362″

Driver:PH 2 or slot 0.050–0.060″

Tap drill:#25 (0.1495″)

Materials

Oval Head Screw Materials & Finishes

Material	Typical finish	Best for
A2 stainless (304)	Plain, passivated	Furniture, fittings, indoor and outdoor
A4 stainless (316)	Plain, passivated	Boats, coastal and chemical environments
Brass	Plain, nickel or chrome	Decorative hardware, electrical plates
Low-carbon steel	Zinc, nickel or chrome plated	Dry indoor assembly at low cost

Stainless A2

304 · 305

The grade in the photo; 305 heads well cold.

304 305

Stainless A4

316

Marine fittings and wet areas.

316 316L

Brass

Cold-heading brass

Warm colour, polishes and plates well.

C26000 C27000

Low-carbon steel

Plated

Economical machine and wood screws.

1018 1022

Manufacturing

How Our Oval Head Screws Are Made

1

Wire

Stainless, brass or steel wire, certified by heat or lot.

2

Cold heading

Cone, dome and cross recess formed together; slots punched or sawn.

3

Thread rolling

Machine threads or wood screw threads with gimlet point.

4

Cleaning

Degreased; stainless passivated where specified.

5

Finishing

Zinc, nickel or chrome plating; polishing for brass.

6

Inspection

Head, protrusion, recess and thread checked; lot sealed.

Applications

Where Our Oval Head Screws Are Used

Door & cabinet hardware

Hinges, strike plates, handles and escutcheons.

Switch & socket plates

Cover plates with a neat raised head.

Boat fittings

A4 and brass oval heads on deck hardware and trim.

Furniture & joinery

DIN 95 and DIN 7995 wood screws, with cup washers.

Appliances

Visible panels and trim on consumer products.

Vehicle interiors

Trim panels and fittings where heads stay visible.

Quality & testing

Oval Head Screw Inspection & Certification

Check	Method	Applied to
Head diameter	Micrometer: A / d_k	Every lot
Head protrusion	Protrusion gauge: F at gaging diameter G	Inch machine screws
Slot / recess	Slot gauges; recess penetration gauge	Every lot
Thread	GO / NO-GO ring gauges	Machine screws
Length	From the head edge to the end	Every lot
Material	PMI / chemical analysis	Stainless and brass lots

Every shipment includes

Mill certificate with heat number
Dimensional report
Lot number on every box

On request

EN 10204 3.1 certificate
Salt spray test for plated lots
Screw and cup washer kits

FAQ

Oval Head Screw Questions, Answered

An oval head screw, also called a raised countersunk head screw, has a countersunk head with a low dome on top. The cone sits in a countersink while the dome stays slightly above the surface. Inch machine screws are made to ASME B18.6.3, metric screws to ISO 2010 (slotted) and ISO 7047 (cross recessed), and wood screws to DIN 95 and DIN 7995.

Both have the same countersunk cone and head diameter: for ASME No. 10, up to 0.362 in. The oval head adds a raised dome, so its total height is up to 0.176 in against 0.116 in for the flat head, and its slot can be deeper (up to 0.103 in against 0.053 in). The flat head finishes flush; the oval head stands slightly proud and looks more decorative.

Inch oval head screws to ASME B18.6.3 need an 82 degree countersink. Metric raised countersunk screws to ISO 2010 and ISO 7047 need 90 degrees. With the wrong angle the head bears only on its edge or on its underside instead of on the whole cone.

ASME B18.6.3 gauges it: when the countersink diameter at the surface equals the gaging diameter G, the top of the head protrudes by F. For No. 10, G is 0.313 in and F is 0.075 to 0.102 in. A larger countersink lets the head sit lower; our calculator works out the protrusion for any countersink diameter.

From the edge of the head, where the countersunk cone meets the raised top, to the end of the screw. The countersunk part is included in the length; the raised oval is not.

Size 0 for 2 mm screws, size 1 for 2.5 and 3 mm, size 2 for 3.5 to 5 mm, size 3 for 5.5 to 7 mm and size 4 for 8 mm. The recess can be Phillips (type H) or Pozidriv (type Z); use the matching bit type as well as the matching size.

Not a flat washer, which would stop the cone seating. On soft material, trim or panels that cannot be countersunk, use a countersunk finishing (cup) washer: it gives the head a proper cone to sit in and a neat raised look.

Most often A2 (304) and A4 (316) stainless steel, brass for decorative and electrical work, and low-carbon steel with zinc, nickel or chrome plating. The screw in our photo is a slotted stainless oval head wood screw.