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DIN 7500 · ASME A, AB, B, BP, C · ISO 1478

Thread Forming Screws Manufacturer in India

Form a strong thread without chips. We make thread forming screws: trilobular DIN 7500 thread rolling screws with ISO metric thread and inch tapping screws Types A, AB, B, BP and C, in case-hardened steel and stainless. Below: every form and point, full dimension tables, DIN 7500-2 hole sizes and a hole and length finder.

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  • ISO 9001:2015 certified manufacturer
  • No chips, no tapping
  • Metric and inch
  • Steel, A2 & A4
Stainless steel hexalobular pan head thread forming screws
Metric DIN 7500, M2–M12 Inch A, AB, B, BP, C Section trilobular
Overview

Type AB, B & DIN 7500 (Thread Forming Screws): Manufacturer & Supplier

A thread forming screw rolls its own mating thread into a plain hole. The material of the hole is displaced and strain-hardened, not cut, so there are no chips and the material around the thread is not interrupted.

Exotic Alloy manufactures thread forming screws in Mumbai, India, and supplies them to makers of enclosures, appliances, electronics, automotive parts and castings across India and abroad, including Sweden and the rest of Europe, the Gulf and Africa.

Two families

Metric DIN 7500 thread rolling screws have a trilobular body and an ISO metric thread, in seven head forms. Inch ASME tapping screws come with a gimlet point (A, AB), a blunt point (B), a cone point (BP) or a machine screw thread (C). For screws that cut instead, see thread cutting screws; for screws that drill their own hole, self-drilling screws.

DIN 7500 Trilobular ASME A, AB, B, BP, C No chips Steel, A2, A4
Thread forming screw at a glance
Also called
Thread rolling screw, tapping screw
Metric
DIN 7500-1 forms CE–QE; holes DIN 7500-2
Inch
ASME B18.6.4 (now B18.6.3): A, AB, B, BP, C
Hole
Drilled, cast or punched; no tapping
DIN 7500 lead
At most 4 pitches
Related
Thread cutting, pan head, countersunk
DIN 7500 form PE M5 by 12 hexalobular pan head thread rolling screw drawn to scale: head 9.14 to 9.5 mm across and 3.52 to 3.7 mm high with a T25 hexalobular socket, metric thread with pitch 0.8 mm, a tapered lead of at most 4 pitches (3.2 mm) and a trilobular cross-section that forms the nut thread without chips dk 9.14–9.5 k 3.52–3.7 L 12 (from the bearing face) lead ≤ 4P = 3.2 M5 × 0.8, ISO metric T25 hexalobular socket trilobular section (lobing exaggerated) T25, A 4.5 top of head Hole in 3 mm steel 4.5 mm (DIN 7500-2) Hardness core 290–370 HV10; surface ≥ 450 HV0.3 EXOTIC ALLOY
A DIN 7500 form PE M5 × 12 hexalobular pan head thread rolling screw, the style in our photo. Head as ISO 14583; lead length and trilobular section from the DIN 7500 drawing; hole from DIN 7500-2.
Specification

Thread Forming Screw Specification

The range we manufacture and supply.

Metric standardsDIN 7500-1 (forms CE, DE, EE, NE, OE, PE, QE); DIN 7500-2 holes
Inch standardASME B18.6.4-1998, now ASME B18.6.3
SizesM2–M12 by form; No. 0 to 1/2 in
Lengths3–60 mm (form PE); inch to order
ThreadsISO metric (trilobular); ASME spaced; UNC / UNF (Type C)
DrivesHexalobular, cross recess, hexagon, hexagon socket, slotted
MaterialsCase-hardened steel; 18-8 (A2) and A4 stainless
FinishZinc plated; stainless plain
CertificationMill certificate; EN 10204 3.1 on request
PackingBoxes of 100 to 5,000; bulk cartons
Forms & points

DIN 7500 Forms & ASME Type A, AB, B, BP, C Points

DIN 7500 formHeadHead as inSizes
CECross recessed pan headISO 7045M2–M10
DEHexagon headISO 4017M2–M12
EEHexagon socket head capISO 4762M2–M12
NECross recessed raised countersunkISO 7047M2–M10
OEHexalobular socket head capISO 14579M2–M12
PEHexalobular socket pan headISO 14583M2–M10
QEHexalobular socket raised countersunkISO 14584M2–M10

DIN 7500-1:2009 Table 6; dimensions not given in DIN 7500 follow the head standard named. Our photo shows form PE.

The five ASME thread forming points at the same scale for size No. 8: Type A with the coarse 15 threads per inch thread and a 45 degree gimlet point, Type AB with the 18 threads per inch spaced thread and a 45 degree gimlet point, Type B with a blunt tapered point, Type BP with a 40 degree cone point, and Type C with the 8-32 machine screw thread and a blunt tapered point Type A 8-15, Type A thread gimlet, 45° ± 5° Type AB 8-18 spaced gimlet, 45° ± 5° Type B 8-18 spaced blunt, dp .112 Type BP 8-18 spaced cone, 40° ± 8° Type C 8-32 machine blunt taper, dp .132 Same scale, mean diameters; thread forms and points from the ASME B18.6.4 drawings (schematic) EXOTIC ALLOY
The five ASME thread forming points at the same scale, size No. 8. A and AB start their own thread in thin metal; B, BP and C need a hole.
ASME typeThreadPointTypical use
Type AType A, coarser than ABGimlet, 45° ± 5°Self starting in thin (0.015–0.050 in) metal or resin-filled plywood; Type AB is recommended over A
Type ABSpaced (as Type B)Gimlet, 45° ± 5°Self starting in thin metal or resin-filled plywood, particularly in brittle materials
Type BSpacedBlunt, incomplete entering threadsMoulded or through holes in thin metal, non-ferrous castings, plastics or resin-filled plywood
Type BPSpacedCone, 40° ± 8°–
Type CMachine screw (UNC / UNF)Blunt, tapered–

Points from the ASME B18.6.4 drawings; uses from maker datasheets for Types A, AB and B. ASME B18.6.3 also lists Type TRS thread rolling screws (Table 45), not tabulated here.

Dimensions

Thread Forming Screw Dimensions

SizeHead dk
max / min		Head k
max / min		Hexalobular
size, A ref.		Socket depth t
max / min		Lead
max 4P		b min
long screws		Lengths
mm
M2 × 0.44 / 3.71.6 / 1.46T6, 1.750.77 / 0.631.6253–20
M2.5 × 0.455 / 4.72.1 / 1.96T8, 2.41.04 / 0.911.8253–25
M3 × 0.55.6 / 5.32.4 / 2.26T10, 2.81.27 / 1.012254–30
M3.5 × 0.67 / 6.642.6 / 2.46T15, 3.351.33 / 1.072.4385–35
M4 × 0.78 / 7.643.1 / 2.92T20, 3.951.66 / 1.272.8385–40
M5 × 0.89.5 / 9.143.7 / 3.52T25, 4.51.91 / 1.523.2386–50
M6 × 112 / 11.574.6 / 4.3T30, 5.62.42 / 2.024388–60
M8 × 1.2516 / 15.576 / 5.7T45, 7.953.18 / 2.7953810–60
M10 × 1.520 / 19.487.5 / 7.14T50, 8.954.02 / 3.6263812–60

DIN 7500 form PE, mm; head and socket as ISO 14583:2011. The thread is fully formed from the lead (at most 4P) to near the head; long screws have b min of thread.

SizeThreads
per inch		Major d
max / min		Minor d1
max / min		AB min. L
90° / csk		B: point dp / taper s
ref. / max–min		B min. L
90° / csk		BP min. L
90° / csk		Torsion
min, lb-in
No. 048.060 / .054.036 / .0331/8 / 5/32.031 / .031–.0421/8 / 1/85/32 / 3/16–
No. 142.075 / .069.049 / .0465/32 / 3/16.044 / .036–.0481/8 / 5/323/16 / 7/32–
No. 232.088 / .082.064 / .0603/16 / 7/32.058 / .047–.0625/32 / 3/161/4 / 9/324
No. 328.101 / .095.075 / .0713/16 / 1/4.068 / .054–.0713/16 / 7/329/32 / 5/169
No. 424.114 / .108.086 / .0827/32 / 9/32.079 / .063–.0833/16 / 1/45/16 / 11/3213
No. 520.130 / .123.094 / .0901/4 / 5/16.087 / .075–.1007/32 / 9/3211/32 / 13/3218
No. 620.139 / .132.104 / .0999/32 / 11/32.095 / .075–.1001/4 / 9/323/8 / 7/1624
No. 719.154 / .147.115 / .1095/16 / 3/8.105 / .079–.1051/4 / 5/1613/32 / 15/3230
No. 818.166 / .159.122 / .1165/16 / 3/8.112 / .083–.1119/32 / 11/327/16 / 1/239
No. 1016.189 / .182.141 / .1353/8 / 7/16.130 / .094–.1255/16 / 3/81/2 / 19/3256
No. 1214.215 / .208.164 / .1577/16 / 21/32*.152 / .107–.14311/32 / 7/169/16 / 21/3288
1/4 in14.246 / .237.192 / .1851/2 / 19/32.179 / .107–.1433/8 / 1/221/32 / 3/4142
5/16 in12.315 / .306.244 / .2365/8 / 3/4.230 / .125–.16715/32 / 19/3227/32 / 31/32290
3/8 in12.380 / .371.309 / .2993/4 / 29/32.293 / .125–.16717/32 / 11/1615/16 / 1-1/8590
7/16 in10.440 / .429.359 / .3497/8 / 1-1/32.343 / .150–.2005/8 / 25/321-1/8 / 1-1/4–
1/2 in10.504 / .493.423 / .4131 / 1-5/32.407 / .150–.20011/16 / 27/321-1/4 / 1-13/32–

ASME B18.6.4-1998 Tables 5 and 6 = ASME B18.6.3-2013 Tables 40 and 41, inch; taper s from the 1998 table. *No. 12 countersunk AB length as published. Torsion from maker datasheets (Types AB and B, identical). Type C has the thread and point of Types D, F, G, T: see the table on our thread cutting page.

SizeThreads
per inch		Major d
max / min		Minor d1
max / min		AB thread at or below L
90° / csk		Torsion
min, lb-in
No. 040.060 / .057.042 / .0391/8 / 3/16–
No. 132.075 / .072.051 / .0481/8 / 3/16–
No. 232.088 / .084.061 / .0565/32 / 3/16–
No. 328.101 / .097.076 / .0713/16 / 7/32–
No. 424.114 / .110.083 / .0783/16 / 1/4–
No. 520.130 / .126.095 / .0903/16 / 1/4–
No. 618.141 / .136.102 / .0961/4 / 5/1624
No. 716.158 / .152.114 / .1085/16 / 3/830
No. 815.168 / .162.123 / .1163/8 / 7/1639
No. 1012.194 / .188.133 / .1263/8 / 1/248
No. 1211.221 / .215.162 / .1557/16 / 9/1683
No. 1410.254 / .248.185 / .1781/2 / 5/8125
No. 1610.280 / .274.197 / .1899/16 / 3/4–
No. 189.306 / .300.217 / .2095/8 / 13/16–
No. 209.333 / .327.234 / .22611/16 / 13/16250
No. 249.390 / .383.291 / .2823/4 / 1492

ASME B18.6.4-1998 Table E1 = ASME B18.6.3-2013 Table 42, inch. Screws of the listed length and shorter are made with the Type AB thread.

SizePitch PMajor d1
max / min		Minor d2
max / min		End length y
C / F / R, ref.		Former No.Same thread as
ASME spaced (AB, B)
ST2.20.82.24 / 2.101.63 / 1.522 / 1.6 / –2No. 2-32
ST2.91.12.90 / 2.762.18 / 2.082.6 / 2.1 / –4No. 4-24
ST3.31.33.30 / 3.122.39 / 2.293 / 2.5 / –5No. 5-20
ST3.51.33.53 / 3.352.64 / 2.513.2 / 2.5 / 2.76No. 6-20
ST3.91.33.91 / 3.732.92 / 2.773.5 / 2.7 / 37No. 7-19
ST4.21.44.22 / 4.043.10 / 2.953.7 / 2.8 / 3.28No. 8-18
ST4.81.64.80 / 4.623.58 / 3.434.3 / 3.2 / 3.610No. 10-16
ST5.51.85.46 / 5.284.17 / 3.995 / 3.6 / 4.312No. 12-14
ST6.31.86.25 / 6.034.88 / 4.706 / 3.6 / 5141/4 in-14
ST82.18.00 / 7.786.20 / 5.997.5 / 4.2 / 6.3165/16 in-12
ST9.52.19.65 / 9.437.85 / 7.598 / 4.2 / –203/8 in-12

ISO 1478, mm; ends C (pointed), F (flat), R (rounded). Inch match: converted maximum major and minor diameters are equal (our check); former number for information only.

How it forms

How a Thread Rolling Screw Forms Its Thread

Schematic of thread forming with a trilobular screw: seen end-on, only the three lobes press into the wall of the hole, so the screw turns with low friction; in section, the hole wall is displaced into the screw thread and strain-hardened, and no chips are made End view: three lobes do the work dashed: drilled hole; lobes press past it, flats stay clear Section: wall displaced, no chips hole wall before material pushed into the flanks and strain-hardened Schematic, not to scale EXOTIC ALLOY
The trilobular body touches the hole only at its three lobes. With the radiused thread flanks this keeps the rolling torque low while the thread flanks overlap well.
 Thread formingThread cuttingSelf-drilling
HoleDrilled, cast, punched or laseredDrilled or coredNone: the point drills it
How the thread is madeMaterial displaced and strain-hardened; no chipsCut; chips leave by the fluteDrilled, then tapped by the thread
StandardsDIN 7500; ASME A, AB, B, BP, C; ISO 1478 tapping screwsASME D, F, G, T, BF, BT; DIN 7513ISO 15480–15483
Our pageThis pageThread cuttingSelf Drilling SMS
Hole sizes

DIN 7500-2 Hole Sizes & ASME Test Holes

The longer the engagement, the larger the guideline hole.

DIN 7500-2 guideline hole diameters in steel shown as percentage of thread, one panel per size from M2.5 to M10: the hole generally grows as the length of engagement increases, so the formed thread is about 41 to 48 percent deep at the thinnest listed thickness and about 26 to 38 percent at the thickest Steel, % of thread = (d − hole) / (1.299 P) against thickness 0–15 mm; our calculation from DIN 7500-2 30 40 5 10 M2.5 dh 2.25–2.3 5 10 M3 dh 2.7–2.75 5 10 M3.5 dh 3.15–3.2 5 10 M4 dh 3.6–3.7 30 40 5 10 M5 dh 4.5–4.65 5 10 M6 dh 5.4–5.55 5 10 M8 dh 7.25–7.5 5 10 M10 dh 9.2–9.5 % Thickness or length of engagement, mm (ticks at 5 and 10); thicker parts get a larger hole and a shallower thread EXOTIC ALLOY
DIN 7500-2 steel holes expressed as % of thread. Thin parts get a deeper thread; thick parts a shallower one over more turns.
Thickness
mm		M2.5M3M3.5M4M5M6M8M10
0.82.25–––––––
0.92.25–––––––
12.252.7––––––
1.22.252.73.15–––––
1.52.252.73.153.64.5–––
1.62.252.73.23.64.5–––
1.72.252.73.23.64.5–––
1.82.252.75 / 2.7 / 2.73.23.64.5–––
22.252.75 / 2.7 / 2.73.23.64.55.4––
2.22.252.753.23.64.55.47.25–
2.52.252.753.23.65 / 3.6 / 3.64.55.47.259.2 / – / –
32.32.753.23.65 / 3.6 / 3.64.55.457.259.2 / 9.15 / 9.15
3.22.32.753.23.65 / 3.6 / 3.64.55 / 4.5 / 4.55.457.259.2 / 9.15 / 9.15
3.52.32.753.23.654.555.457.259.2 / 9.15 / 9.15
42.32.753.23.654.555.55 / 5.45 / 5.457.39.3 / 9.15 / 9.15
52.32.753.2 / 3.25 / 3.253.7 / 3.65 / 3.654.65.55 / 5.45 / 5.457.4 / 7.3 / 7.39.3 / 9.2 / 9.25
5.5–2.753.2 / 3.25 / 3.253.7 / 3.65 / 3.654.65.5*7.4 / 7.3 / 7.39.3 / 9.2 / 9.25
6–2.75–3.7 / 3.65 / 3.654.65.5*7.4 / 7.3 / 7.39.3 / 9.2 / 9.25
6.3–––3.74.655.5*7.4 / 7.3 / 7.359.3 / 9.2 / 9.25
6.5–––3.74.655.5*7.4 / 7.3 / 7.359.3 / 9.2 / 9.25
7–––3.74.655.55 / 5.5 / 5.57.4 / 7.3 / 7.49.3 / 9.2 / 9.3
7.5–––3.74.655.55 / 5.5 / 5.57.4 / 7.3 / 7.49.4 / 9.3 / 9.3
8 to ≤ 10––––4.655.557.4 / 7.3 / 7.49.4 / 9.3 / 9.3
> 10 to ≤ 12––––––7.59.5 / 9.4 / 9.4
> 12 to ≤ 15––––––7.59.5 / 9.4 / 9.4

DIN 7500-2 guideline hole diameters dh, mm, tolerance H11, by material thickness or length of engagement. One value applies to steel, aluminium and copper alloys; three values are St / Al / Cu. *M6 steel 5.5 mm as in the copy we used, below the 4–5 mm value. The M10 15–20 mm row was unreadable and is left out. Verify holes by testing the actual parts.

TypeSizeTest plate
in		Test hole
drill, in		% thread
test hole
AB, B, BPNo. 4-24.0460–.0500#44 (.0860)100 % of depth
AB, B, BPNo. 6-20.0730–.0770#32 (.1160)66 % of depth
AB, B, BPNo. 8-18.0730–.0770#29 (.1360)68 % of depth
AB, B, BPNo. 10-16.1230–.1270#21 (.1590)62 % of depth
AB, B, BPNo. 12-14.1230–.12703/16 (.1875)54 % of depth
AB, B, BP1/4-14.1845–.19055.5 mm (.2165)55 % of depth
AB, B, BP5/16-12.1845–.1905I (.2720)61 % of depth
AB, B, BP3/8-12.1845–.190521/64 (.3281)73 % of depth
CNo. 4-40.0460–.0500#41 (.0960)49 %
CNo. 6-32.0730–.0770#31 (.1200)44 %
CNo. 8-32.0730–.0770#27 (.1440)49 %
CNo. 10-24.1230–.1270#19 (.1660)44 %
CNo. 10-32.1230–.127011/64 (.1719)45 %
CNo. 12-24.1230–.1270#11 (.1910)46 %
C1/4-20.1845–.19057/32 (.2188)48 %
C1/4-28.1845–.1905#1 (.2280)47 %
C5/16-18.1845–.1905J (.2770)49 %
C3/8-16.1845–.1905R (.3390)44 %
ANo. 8-15.0730–.0770#29 (.1360)71 % of depth
ANo. 10-12.1230–.1270#21 (.1590)57 % of depth
ANo. 12-11.1230–.12703/16 (.1875)57 % of depth
ANo. 14-10.1230–.12705.5 mm (.2165)54 % of depth

ASME B18.6.3-2013 Table 48: test plate and hole for the drive test, inch. % thread: Type C = threads per inch × (d − hole) / 0.01299; spaced and Type A threads = share of the depth between major and minor diameter (our calculation).

Finder

Thread Forming Screw Hole & Length Finder

The guideline hole for your part and the shortest length that fills it with full threads.

Screw & part

Our calculation. Clamped = parts under the head; engaged = thickness of the part the screw forms its thread in. Metric: DIN 7500-2 guideline hole for the first table thickness at or above yours, H11; length = clamped + engaged + lead (4P), next form PE length, steel mass per 1000 from the PE table. Inch: ASME drive-test hole and plate; length = clamped + engaged + point taper s (Types B, BP, C), not less than the minimum practical length. % thread as in the tables above.

Result
4.5
mm hole (H11)
8
mm length
Hole range / test plate:4.5–4.575 mm
Thread depth:48 % of thread
Table row / minimum length:3 mm row; 7.7 mm
Mass / torsion:2.57 kg per 1000
Designation:DIN 7500 PE M5 × 8

Materials

Thread Forming Screw Materials & Hardness

ScrewMaterialHardnessNotes
DIN 7500Cold extrusion steel, case hardenedSurface ≥ 450 HV 0.3; core 290–370 HV 10Zinc plated
ASME A, AB, B (steel)AISI 1016–1024; liquid quenched, tempered at 650 °F (343 °C) minSurface HRC 45 min; core HRC 28–38Zinc plated
ASME A, AB, B (stainless)18-8 austenitic stainless–General atmospheric corrosion resistance
Thread rolling, stainlessA2 or A4–A2 for indoor assembly into plastics, sheet metal or castings; A4 outdoors and in washdown
ASME steel screw sizeCase depth, in
No. 4 to No. 60.002–0.007
No. 8 to No. 120.004–0.009
1/4 in and larger0.005–0.011

DIN 7500 hardness from the DIN 7500 material note; ASME values and the 18-8 note from maker datasheets for Types A, AB and B; A2 / A4 use from a stainless thread rolling screw supplier. Fastening stainless screws into aluminium or steel can set up galvanic corrosion in some environments.

Carbon steel
Case hardened

DIN 7500 and ASME tapping screws.

10181022
A2 stainless
304 · 305

As in the photo; indoor assembly.

304305
A4 stainless
316

Outdoor and washdown.

316
Manufacturing

How Our Thread Forming Screws Are Made

1

Wire

Cold extrusion steel or stainless, certified by heat.

2

Heading

Head and drive cold formed.

3

Thread & lead

Trilobular or spaced thread rolled with its lead or point.

4

Hardening

Case hardened and tempered (steel).

5

Plating

Zinc plating with hydrogen embrittlement relief.

6

Testing

Hardness, drive and torsion tests per lot.

Applications

Where Our Thread Forming Screws Are Used

Castings

Cast blind holes and rim holes, proven on trial parts.

Sheet metal

Rim holes and drilled, lasered or punched panels.

Electronics

Enclosures and chassis on assembly lines.

Appliances

Plastic and metal housings, Type B in moulded holes.

Automotive

Brackets, trims and housings.

Plywood & panels

Types A and AB in resin-filled plywood.

Quality & testing

Thread Forming Screw Inspection & Certification

CheckMethodApplied to
Head and driveCallipers, gauges to the head standardEvery lot
Thread and leadThread and point dimensionsEvery lot
Surface and core hardnessVickers / RockwellEvery heat-treatment lot
Case depthMicro-sectionEvery heat-treatment lot
Drive testInto the test plate and holeEvery lot
Torsional strengthTorque to failureEvery lot

Every shipment includes

  • Mill certificate with heat number
  • Hardness and drive test report
  • Lot number on every box

On request

  • EN 10204 3.1 certificate
  • Salt spray test for plated lots
  • RoHS declaration
FAQ

Thread Forming Screw Questions, Answered

A screw that makes its mating thread by displacing the material of the hole instead of cutting it, so no chips are produced. Metric thread rolling screws to DIN 7500 have a trilobular body and an ISO metric thread; inch thread forming tapping screws are ASME Types A, AB, B, BP and C.

A thread forming screw pushes the material aside and strain-hardens it, and the material structure around the thread is not interrupted. A thread cutting screw removes material through a slot or flute and makes chips. Cutting screws are covered on our thread cutting page.

A screw whose threaded body is slightly three-lobed in section, as in DIN 7500. Only the three lobes press into the wall of the hole, which together with the radiused thread flanks keeps the rolling torque low, and the screw forms a metric nut thread.

DIN 7500-2 gives guideline hole diameters, tolerance H11, by size, material and thickness. For M5 in steel: 4.5 mm for 1.5 to 3 mm, 4.55 mm for 3.2 to 4 mm, 4.6 mm for 5 to 6 mm and 4.65 mm for 6.3 to 10 mm. Verify the hole by testing the actual parts.

At least the thickness clamped under the head plus the length of engagement plus the tapered lead, which DIN 7500 limits to 4 pitches (3.2 mm for M5), so that full threads fill the hole. Our finder adds these up and picks the next standard length.

Inch thread forming tapping screws. Types A and AB have a gimlet point (45 degrees) for self starting in thin metal or resin-filled plywood, and Type AB is recommended over Type A. Type B has a blunt point with incomplete entering threads for moulded or through holes in thin metal, non-ferrous castings, plastics or plywood. Type BP has the same thread with a 40 degree cone point.

DIN 7500 screws are made from cold extrusion steels, case hardened to a surface hardness of at least 450 HV 0.3 with a core of 290 to 370 HV 10. ASME tapping screws are made from AISI 1016 to 1024 steel, surface at least HRC 45 and core HRC 28 to 38, or 18-8 stainless. A2 and A4 thread rolling screws are also made for plastics, sheet metal and castings.

Dimensionally yes for the main diameters: converted to millimetres, the maximum major diameter and the minor diameter of the ASME spaced thread equal ISO 1478, for example No. 8-18 and ST4.2. The ISO pitch is the inch pitch rounded, for example 18 threads per inch (1.41 mm) and 1.4 mm.
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