Pan Head Screws Manufacturer in India | Cross Recessed Pan Head Screws

Overview

Cross Recessed Pan Head Screws & Slotted Pan Head Machine Screws: Manufacturer & Distributor

The pan head is the general-purpose machine screw head: wide enough to clamp well, low enough to stay tidy, with room for a deep cross recess so it drives quickly and does not cam out easily.

Exotic Alloy manufactures pan head screws in Mumbai, India, for electronics, electrical, appliance, instrument and machinery makers. We stock across India and supply Poland, Europe, the Gulf and Africa. Heads are cold formed with the recess or slot in one blow, and threads are rolled.

Metric and inch

Metric pan heads follow ISO 7045 (cross recessed, which replaced DIN 7985), ISO 1580 (slotted, formerly DIN 85) and ISO 14583 (hexalobular). Inch pan heads follow ASME B18.6.3, with a taller head for the Phillips version. For a lower dome with a hex socket see button head screws.

ISO 7045 ISO 1580 DIN 7985 ASME B18.6.3 A2 / A4 stainless

Pan head screw at a glance

Head: Wide, low, straight sides, slightly domed top
Drive: Phillips (H), Pozidriv (Z), slot, hexalobular
Length: From under the head
Threads: Metric coarse 6g; UNC / UNF
Grades: A2-70, A4-70, steel 4.8, brass
Related: Round head, truss head, cheese head

ISO 7045 M5 × 12 cross recessed pan head screw, drawn to scale from the ISO head dimensions. Head outline and recess simplified; top views compare the cross recessed and slotted M5 heads.

Specification

Pan Head Screw Specification

The range we manufacture and supply.

StandardsISO 7045 (ex DIN 7985); ISO 1580 (ex DIN 85); ISO 14583; ASME B18.6.3

Size rangeM1.6–M10 (larger to drawing); No. 0 to 3/4″

ThreadMetric coarse 6g, fine to order; UNC / UNF

Lengths2–100 mm and 1/8″ to 4″; longer to order

DrivePhillips (type H); Pozidriv (type Z); slotted; hexalobular

GradesA2-70, A4-70 (ISO 3506-1); steel 4.8; brass

FinishPlain or passivated stainless; zinc plated, black or nickel steel; plain or nickel brass

OptionsCaptive washers (SEMS), thread-locking and sealing patches to order

CertificationMill certificate; EN 10204 3.1; PMI for stainless

PackingBoxes of 100 to 5000, bulk cartons, kits

Head types

Slotted vs Cross Recessed Pan Heads, Metric & Inch

Cross recessed pan heads are taller than slotted ones, because the recess needs depth. Here are the M5 and No. 10 heads side by side, with a button head for comparison.

Heads of about 9.5–10 mm at the same scale, from ISO 1580, ISO 7045, ASME B18.6.3 and ISO 7380-1.

Dimensions

Pan Head Screw Dimensions

ISO 7045 pan heads from M1.6 to M10 at the same scale, cross recess and profile.

Size	P	d_k head dia. max	k head height max	Cross recess size	m ≈ H / Z	Tap drill d − P	Clearance hole ISO 273 medium
M1.6	0.35	3.2	1.3	0	1.7 / 1.6	1.25	1.8
M2	0.4	4	1.6	0	1.9 / 2.1	1.6	2.4
M2.5	0.45	5	2	1	2.7 / 2.6	2.05	2.9
M3	0.5	6	2.4	1	3 / 2.8	2.5	3.4
M3.5	0.6	7	2.7	2	3.9 / 3.9	2.9	3.9
M4	0.7	8	3.1	2	4.4 / 4.3	3.3	4.5
M5	0.8	10	3.8	2	4.9 / 4.7	4.2	5.5
M6	1	12	4.6	3	6.9 / 6.7	5	6.6
M8	1.25	16	6	4	9 / 8.8	6.75	9
M10	1.5	20	7.5	4	10.1 / 9.9	8.5	11

ISO 7045:2011 cross recessed pan head screws, product grade A, mm. H = Phillips, Z = Pozidriv. Tap drill and hole are standard practice for reference.

Size	d_k head dia. max	k head height max	n slot width nom	t slot depth min	vs ISO 7045 head height
M1.6	3.2	1	0.4	0.35	1.3
M2	4	1.3	0.5	0.5	1.6
M2.5	5	1.5	0.6	0.6	2
M3	5.6	1.8	0.8	0.7	2.4
M3.5	7	2.1	1	0.8	2.7
M4	8	2.4	1.2	1	3.1
M5	9.5	3	1.2	1.2	3.8
M6	12	3.6	1.6	1.4	4.6
M8	16	4.8	2	1.9	6
M10	20	6	2.5	2.4	7.5

ISO 1580:2011 slotted pan head screws, product grade A, mm, with the ISO 7045 head height for comparison.

Size	d_k / k DIN 7985	d_k / k ISO 7045	m H DIN 7985 / ISO 7045	m Z DIN 7985 / ISO 7045
M1.6	3.2 / 1.3	3.2 / 1.3	1.8 / 1.7	1.8 / 1.6
M2	4 / 1.6	4 / 1.6	2.5 / 1.9	2.4 / 2.1
M2.5	5 / 2	5 / 2	2.7 / 2.7	2.6 / 2.6
M3	6 / 2.4	6 / 2.4	3.1 / 3	3 / 2.8
M3.5	7 / 2.7	7 / 2.7	4.2 / 3.9	4 / 3.9
M4	8 / 3.1	8 / 3.1	4.6 / 4.4	4.3 / 4.3
M5	10 / 3.8	10 / 3.8	5.3 / 4.9	5 / 4.7
M6	12 / 4.6	12 / 4.6	6.8 / 6.9	6.7 / 6.7
M8	16 / 6	16 / 6	9 / 9	8.8 / 8.8
M10	20 / 7.5	20 / 7.5	10.2 / 10.1	9.9 / 9.9

DIN 7985:1990 (withdrawn, replaced by ISO 7045) against ISO 7045, mm: the same head; only the reference recess depth m differs.

Size	UNC	A head dia. max / min	H slotted max / min	H Phillips max / min	J slot width max / min	T slot depth max / min	Phillips driver
No. 0	UNF 80	.116 / .104	.039 / .031	.044 / .036	.023 / .016	.022 / .014	PH 0
No. 1	64	.142 / .130	.046 / .038	.053 / .044	.026 / .019	.027 / .018	PH 0
No. 2	56	.167 / .155	.053 / .045	.062 / .053	.031 / .023	.031 / .022	PH 1
No. 3	48	.193 / .180	.060 / .051	.071 / .062	.035 / .027	.036 / .026	PH 1
No. 4	40	.219 / .205	.068 / .058	.080 / .070	.039 / .031	.040 / .030	PH 1
No. 5	40	.245 / .231	.075 / .065	.089 / .079	.043 / .035	.045 / .034	PH 2
No. 6	32	.270 / .256	.082 / .072	.097 / .087	.048 / .039	.050 / .037	PH 2
No. 8	32	.322 / .306	.096 / .085	.115 / .105	.054 / .045	.058 / .045	PH 2
No. 10	24	.373 / .357	.110 / .099	.133 / .122	.060 / .050	.068 / .053	PH 2
No. 12	24	.425 / .407	.125 / .112	.151 / .139	.067 / .056	.077 / .061	PH 3
1/4″	20	.492 / .473	.144 / .130	.175 / .162	.075 / .064	.087 / .070	PH 3
5/16″	18	.615 / .594	.178 / .162	.218 / .203	.084 / .072	.106 / .085	PH 4
3/8″	16	.740 / .716	.212 / .195	.261 / .244	.094 / .081	.124 / .100	PH 4
7/16″	14	.863 / .837	.247 / .228	.305 / .284	.094 / .081	.142 / .116	PH 4
1/2″	13	.987 / .958	.281 / .260	.348 / .325	.106 / .091	.161 / .131	PH 4
9/16″	12	1.041 / 1.000	.315 / .293	.391 / .366	.118 / .102	.179 / .146	PH 4
5/8″	11	1.172 / 1.125	.350 / .325	.434 / .406	.133 / .116	.197 / .162	PH 5
3/4″	10	1.435 / 1.375	.419 / .390	.521 / .488	.149 / .131	.234 / .192	PH 5

ASME B18.6.3-2013 slotted (Table 17) and type I cross recessed (Tables 18/19) pan heads, inches. Same head diameter; the Phillips head is taller.

Drives

Phillips, Pozidriv, Slotted or Hexalobular?

Drive	Standard	Bit	Choose it for
Phillips (type H)	ISO 7045 H, ASME type I	PH	The most common recess; fast with power drivers
Pozidriv (type Z)	ISO 7045 Z	PZ	Less cam-out than Phillips; common in Europe
Slotted	ISO 1580, ASME slotted	Flat blade	Any screwdriver; easy to clean; lower head
Hexalobular	ISO 14583	Six-lobe	Highest drive torque, least cam-out

Use the bit type that matches the recess: a Phillips bit in a Pozidriv recess (or the reverse) fits loosely and damages both.

Holes

Tap Drills, Clearance Holes & Bearing Area

For metric coarse threads the usual tap drill is the thread size minus the pitch (4.2 mm for M5). The clearance hole in the top part follows ISO 273; the medium series (5.5 mm for M5) suits most assemblies.

The ring of head left around the clearance hole is the bearing area that carries the clamp load. A wider head or a washer spreads the load further, which helps in plastics, aluminium and thin sheet.

Example: ISO 7045 M5

Tap drill: 4.2 mm
Clearance hole: 5.5 mm (ISO 273 medium)
Head: Ø 10 mm × 3.8 mm
Bearing area: about 55 mm² (our calculation)
Driver: PH 2 or PZ 2

Calculator

Pan Head Screw Size, Driver & Hole Finder

Pick metric or inch, the size and the drive to get the head size, the driver, the tap drill, the clearance hole and the bearing area.

Screw

System

Size

Drive

Head data from ISO 7045 / ISO 1580 and ASME B18.6.3. Metric tap drill = d − P; clearance hole ISO 273 medium; bearing area is our calculation from the maximum head diameter and the clearance hole. Inch tap drills for about 75 % thread.

Result

10

mm head diameter

3.8

mm head height

Driver:PH 2 / PZ 2

Tap drill:4.2 mm

Clearance hole:5.5 mm

Bearing area:54.8 mm²

Materials

Pan Head Screw Materials & Finishes

Material	Class	Finish	Best for
A2 stainless (304)	A2-70	Plain, passivated	Electronics, enclosures, general use
A4 stainless (316)	A4-70	Plain, passivated	Marine, food, pharma and chemical equipment
Carbon steel	4.8	Zinc plated, black, nickel	Dry indoor assembly at low cost
Brass	–	Plain, nickel	Electrical contacts, non-magnetic parts

Stainless A2

304 · 305

The grade in the photo.

304 305

Stainless A4

316

Chlorides and cleaning agents.

316 316L

Carbon steel

4.8

Economical machine screws.

1018 1022

Brass

Cold-heading brass

Conductive and non-magnetic.

C26000 C27000

Manufacturing

How Our Pan Head Screws Are Made

1

Wire

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

2

Cold heading

Pan head and cross recess formed together; slots punched.

3

Thread rolling

Metric or UNC / UNF threads rolled; washers assembled first for SEMS.

4

Cleaning

Degreased; stainless passivated where specified.

5

Finishing

Zinc, black or nickel plating; patches applied.

6

Inspection

Head, recess penetration and thread checked; lot sealed.

Applications

Where Our Pan Head Screws Are Used

Electronics

PCB mounting, chassis and covers.

Electrical

Switchgear, sockets, terminals and DIN rails.

Appliances

Panels, brackets and motor mounts.

Instruments

Meters, sensors and housings.

Machinery

Covers, guards and small brackets.

Food equipment

A4 stainless pan heads on panels and fittings.

Quality & testing

Pan Head Screw Inspection & Certification

Check	Method	Applied to
Head diameter & height	Micrometer: d_k, k	Every lot
Cross recess	Penetration gauge, type H / Z	Cross recessed lots
Slot	Width and depth gauges	Slotted lots
Thread	GO / NO-GO ring gauges	Every lot
Length	Measured under the head	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
Count-checked kits and labels

FAQ

Pan Head Screw Questions, Answered

A pan head screw has a wide, fairly low head with almost straight sides, a slightly domed top and a flat bearing face. It is the most common general-purpose machine screw head. Metric pan heads are made to ISO 7045 (cross recessed) and ISO 1580 (slotted); inch pan heads to ASME B18.6.3.

DIN 7985 was withdrawn and replaced by ISO 7045. The head diameter and height are the same in both, for example 10 mm across and 3.8 mm high for M5; only the reference cross recess depth m differs slightly (5.3 mm in DIN 7985 against 4.9 mm in ISO 7045 for M5, type H). The screws are interchangeable.

A cross recess needs more depth than a slot, so cross recessed pan heads are made taller. For M5, ISO 1580 slotted is 3 mm high and ISO 7045 cross recessed 3.8 mm; for inch No. 10, the ASME slotted pan head is up to 0.110 in high and the Phillips pan head up to 0.133 in, both 0.373 in across.

For ISO 7045: recess size 0 for M1.6 and M2, 1 for M2.5 and M3, 2 for M3.5 to M5, 3 for M6 and 4 for M8 and M10. Use a Phillips (PH) bit for type H recesses and a Pozidriv (PZ) bit for type Z. For inch Phillips pan heads, No. 10 takes a PH 2 driver.

A pan head has straighter sides and a flatter top and is usually driven by a cross recess or slot; a button head (ISO 7380) is a lower dome with a hex socket. For M5, the ISO 7045 pan head is 10 mm across and 3.8 mm high, the ISO 7380 button head 9.5 mm across and 2.75 mm high.

For metric coarse threads the usual tap drill is the thread size minus the pitch: 2.5 mm for M3, 3.3 mm for M4, 4.2 mm for M5, 5 mm for M6 and 6.8 mm for M8. ISO 273 medium clearance holes are 3.4, 4.5, 5.5, 6.6 and 9 mm for the same sizes.

From the flat underside of the head to the end of the screw; the head is not included. An M5 × 12 pan head screw is 12 mm under the head and about 15.8 mm overall.

Most often A2 (304) and A4 (316) stainless steel, like the screws in our photo, steel in property class 4.8, zinc plated or black, and brass. Use A4 near the sea and in food, pharmaceutical and chemical equipment.