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DIN 929 · Projection weld

Hex Weld Nuts Manufacturer in India

A nut that becomes part of the sheet. We make hex weld nuts to DIN 929, with a locating pilot and three weld projections, in low-carbon steel and stainless A2 and A4. Below: the nut to scale, the dimension table, the hole and sheet thickness for each size, how projection welding works, bolt length and a finder.

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  • ISO 9001:2015 certified manufacturer
  • Steel C ≤ 0.25 %
  • Stainless A2 / A4
  • EN 10204 3.1 / 3.2
Stainless steel DIN 929 hexagon weld nuts with pilot ring
DIN 929 M3 – M16 Sheet 0.63 – 6 mm 3 weld projections
Overview

DIN 929 Projection Weld Nuts: Manufacturer & Distributor

A hex weld nut gives thin sheet a strong, permanent thread. It is welded on once, in a few moments, and from then on a bolt can be fitted from the other side with one hand and one spanner.

Exotic Alloy manufactures and distributes hex weld nuts from Mumbai, India, for vehicle and trailer builders, appliance and enclosure makers, furniture and machinery fabricators, and fastener distributors. We supply across India and to Saudi Arabia, the Gulf, Africa and South-East Asia.

How it is built

The weld face carries a round pilot that drops into a hole in the sheet and three small projections on alternate corners. In projection welding the current flows through the projections, which melt and fuse the nut to the sheet. For high-strength bolts there are flanged weld nuts to ISO 21670; for square weld nuts see square weld nuts, for ordinary nuts hex nuts.

DIN 929 Pilot ring 3 projections Coarse & fine thread Stainless
Hex weld nuts at a glance
Standard
DIN 929:2013 (same sizes as 2000)
Sizes
M3–M16, fine thread 8–16 mm
Hole
= pilot ⌀, 12.5 mm at M10
Sheet
0.63–1.5 mm (M3) to 2–6 mm (M16)
Bolts
Property class below 8.8
Material
Steel C ≤ 0.25 %, A2, A4
Related
Square weld nuts, hex nuts, flange nuts
DIN 929 hexagon weld nut M10 to scale: 17 mm spanner, 8 mm high, a pilot 12.5 mm across and up to 1.15 mm high that locates in the hole of the sheet, and three weld projections up to 0.65 mm high on alternate corners of the weld face DIN 929 hexagon weld nut M10, to scale (before welding) m 7.64–8 across corners e ≥ 18.74 (s 17) pilot ⌀ 12.5, h1 ≤ 1.15: locates in the hole projection h2 ≤ 0.65 sheet Side view across corners 3 projections on alternate corners around the pilot ring (shape schematic) Weld face EXOTIC ALLOY
A DIN 929 M10 weld nut on its sheet, before welding, to scale. The pilot sits in the 12.5 mm hole; only the three projections touch the sheet.
Specification

Hex Weld Nut Specification

The range we manufacture, stock and distribute.

StandardDIN 929; ISO 21670 (with flange) to order
SizesM3, M4, M5, M6, M8, M10, M12, (M14), M16
ThreadMetric coarse; fine pitch 8–16 mm on request
Product gradeA
SteelCarbon at most 0.25 %
StainlessA2 (304), A4 (316)
BoltsProperty class below 8.8
FinishPlain, ready for welding; others on request
CertificationEN 10204 3.1; 3.2 on request
SupplyBulk for feeders, or boxed by size
DIN 929

DIN 929 Hex Weld Nut Dimensions

Coarse thread, mm. (M14) is a non-preferred size.

SizePitch PSpanner s
max / min		e minHeight m
max / min		Pilot ⌀
max / min		Pilot height h1
max / min		Projection h2
max / min		kg / 1000
M30.57.5 / 7.288.153 / 2.754.47 / 4.3950.55 / 0.450.25 / 0.150.78
M40.79 / 8.789.833.5 / 3.25.97 / 5.8950.65 / 0.550.35 / 0.251.13
M50.810 / 9.7810.954 / 3.76.96 / 6.870.7 / 0.60.4 / 0.31.73
M6111 / 10.7312.025 / 4.77.96 / 7.870.75 / 0.60.4 / 0.32.5
M81.2514 / 13.7315.386.5 / 6.1410.45 / 10.340.9 / 0.750.5 / 0.355.27
M101.517 / 16.7318.748 / 7.6412.45 / 12.341.15 / 0.950.65 / 0.59.58
M121.7519 / 18.6720.9110 / 9.6414.75 / 14.641.4 / 1.20.8 / 0.613.7
(M14)222 / 21.6724.2711 / 10.5716.75 / 16.641.8 / 1.61 / 0.821.3
M16224 / 23.6726.5113 / 12.5718.73 / 18.6051.8 / 1.61 / 0.828.5

DIN 929:2013 (same values as 2000). s across flats, e across corners, m height of the nut body, pilot ⌀ (tolerance d11), h1 pilot height, h2 projection height before welding, mass of 1000 steel nuts. Checked against four sources and every tolerance against ISO 286.

Hole & sheet

Weld Nut Hole Size and Sheet Thickness

What to punch, which sheet each size suits, and how the nut compares with an ISO 4032 nut, mm.

SizeHole in the sheet
nominal / max (H13)		Sheet thickness
min – max		Pilot height h1 maxSpanner vs ISO 4032Height vs ISO 4032
M34.5 / 4.680.63 – 1.50.557.5 vs 5.53 vs 2.4
M46 / 6.180.75 – 1.50.659 vs 73.5 vs 3.2
M57 / 7.220.88 – 20.710 vs 84 vs 4.7
M68 / 8.220.88 – 2.50.7511 vs 105 vs 5.2
M810.5 / 10.771 – 30.914 vs 136.5 vs 6.8
M1012.5 / 12.771.25 – 41.1517 vs 168 vs 8.4
M1214.8 / 15.071.5 – 51.419 vs 1810 vs 10.8
(M14)16.8 / 17.072 – 61.822 vs 2111 vs 12.8
M1618.8 / 19.132 – 61.824 vs 2413 vs 14.8

The hole equals the pilot diameter. globalfastener and fasten.it give it an H13 tolerance, as shown; Bossard's data sheet calls for H11 (for example 12.50 to 12.61 mm at M10), which fits within H13 and centres the nut more closely. Sheet thickness range from fasten.it and Bossard.

Recommended sheet thickness for DIN 929 weld nuts, M3 0.63 to 1.5 mm up to M16 2 to 6 mm, with the maximum pilot height marked: the pilot is always shorter than the thinnest recommended sheet Sheet thickness the nut is made for, mm (bar) and pilot height h1 max (dot) 0 1 2 3 4 5 6 mm M3 M3: sheet 0.63 to 1.5 mm, pilot height up to 0.55 mm 0.63–1.5 M4 M4: sheet 0.75 to 1.5 mm, pilot height up to 0.65 mm 0.75–1.5 M5 M5: sheet 0.88 to 2 mm, pilot height up to 0.7 mm 0.88–2 M6 M6: sheet 0.88 to 2.5 mm, pilot height up to 0.75 mm 0.88–2.5 M8 M8: sheet 1 to 3 mm, pilot height up to 0.9 mm 1–3 M10 M10: sheet 1.25 to 4 mm, pilot height up to 1.15 mm 1.25–4 M12 M12: sheet 1.5 to 5 mm, pilot height up to 1.4 mm 1.5–5 M14 M14: sheet 2 to 6 mm, pilot height up to 1.8 mm 2–6 M16 M16: sheet 2 to 6 mm, pilot height up to 1.8 mm 2–6 sheet min–max pilot h1 max EXOTIC ALLOY
The pilot is always shorter than the thinnest recommended sheet. So it locates the nut without standing proud on the far side. Hover a bar for the values.
Welding

How a Weld Nut Is Projection Welded

Projection welding a weld nut in three steps: place the nut with its pilot in the hole, press between electrodes and pass the current so the projections melt, then the nut sits welded on the sheet Projection welding, step by step (schematic, M10 proportions) 1 Place pilot in the hole electrodes press 2 Press + current projections melt 3 Welded nut face on the sheet Projection height drawn to scale before welding; the melt is schematic. Welding current, force and time come from the welding machine set-up. EXOTIC ALLOY
Three steps, one hit of current. The projections carry the current, melt and fuse the nut to the sheet.
  • Pilot: centres the nut in the hole, holds it while welding and keeps spatter out of the thread.
  • Projections: three, on alternate corners; they concentrate the current so the weld forms there and not in the thread.
  • Steel: DIN 929 calls for at most 0.25 % carbon, which welds well; other steels by agreement.
  • Welding current, force and time depend on the machine, sheet and coating: set them with trial welds.
Bolting

Bolt Grade and Bolt Length for Weld Nuts

A part bolted to a sheet with a welded DIN 929 M10 nut: the bolt reaches the top of the nut when its length equals the part plus the sheet plus the nut height Bolting to a welded nut: shortest bolt for full thread engagement part sheet DIN 929 nut, welded part 10 sheet 2 nut m 8 L = 20 Example M10: 10 mm part + 2 mm sheet + 8 mm nut = 20 mm under the head. Add a few pitches so the chamfered end clears the nut. EXOTIC ALLOY
The bolt comes from the other side. It passes through the part and the sheet and engages the full height of the welded nut.
  • Shortest bolt = part + sheet + nut height m. Choose the next standard length; we suggest about two pitches more so the chamfered end clears the nut.
  • The finder below does the sum for your joint.
  • Bolt grade: DIN 929 weld nuts are for bolts below class 8.8 (fasten.it, Bossard). Some sellers quote 8.8; we follow the standard.
  • For class 8.8 to 10.9 bolts use flanged weld nuts to ISO 21670 (M5 to M16), made to order.
Finder

Weld Nut Finder: Hole, Sheet & Bolt Length

Pick the size and enter your sheet and part; get the hole, the sheet check, the bolt length and the order line.

Nut & joint

Dimensions from the tables on this page. Hole = pilot diameter, H13 maximum shown. Shortest bolt = part + sheet + nut height m max; suggested = that plus two pitches. Bolt lengths are under the head. Mass is for steel.

Result
12.5
mm hole (max 12.77)
20
mm shortest bolt
Sheet check:2 mm is within 1.25–4
Suggested bolt:23 mm or the next standard length
Spanner / height:17 / 8 mm (ISO 4032: 16 / 8.4)
Pilot / projections:h1 1.15, h2 0.65 mm max
Mass:≈ 9.58 kg
Designation:1000 pcs hexagon weld nut DIN 929 – M10, steel C ≤ 0.25 %, plain

Materials

Weld Nut Materials & Finishes

MaterialFinishWeld toWhere
Low-carbon steel, C ≤ 0.25 %PlainSteel sheetVehicles, appliances, enclosures, machinery
Stainless A2 (304)PlainStainless sheetFood, kitchen and medical equipment, as in the photo
Stainless A4 (316)PlainStainless sheetOutdoor, coastal and chemical equipment

DIN 929 names steel with at most 0.25 % carbon and allows other steels by agreement. Match the nut to the sheet: steel to steel, stainless to stainless.

Low-carbon steel
C ≤ 0.25 %

The DIN 929 material.

1010
Stainless
A2 · A4

As in the photo.

304316
Flanged weld nuts
ISO 21670

For bolts up to class 10.9.

Flange nuts
Manufacturing

How Our Hex Weld Nuts Are Made

1

Wire

Low-carbon steel or stainless, certified by heat.

2

Form

Hexagon, pilot and projections cold formed in one piece.

3

Tap

Thread tapped through.

4

Gauge

Pilot diameter and projection height checked.

5

Clean

Degreased, left plain for welding.

6

Inspect

Thread gauged, lot certified.

Applications

Where Our Hex Weld Nuts Are Used

Vehicles

Body panels, brackets and seat frames.

Trailers

Chassis and body fixings.

Enclosures

Cabinets and panels, mounted from one side.

Appliances

Sheet-metal housings and frames.

Furniture

Steel frames for seating and storage.

Machinery

Guards, covers and sheet-metal frames.

Quality & testing

Hex Weld Nut Inspection & Certification

CheckMethodApplied to
ThreadGO / NOT GO plug gaugesEvery lot
s, m, pilot ⌀Calipers, micrometerEvery lot
h1, h2Height gaugeEvery lot
Carbon contentHeat certificateEvery heat
Stainless gradePMI on requestStainless lots
Weld strengthPush-out or torque-out of welded samplesOn request

Every shipment includes

  • EN 10204 3.1 certificate
  • Lot number on every box
  • Packing list by size

On request

  • EN 10204 3.2 with third-party inspection
  • Trial welds on your sheet
  • Bulk packing for automatic feeders
FAQ

Hex Weld Nut Questions, Answered

A hexagon nut made to be welded onto sheet metal, so that a bolt can later be fitted from the other side without holding a nut. A DIN 929 weld nut, M3 to M16, has a pilot ring that locates in the hole of the sheet and three projections on alternate corners that melt and fuse to the sheet in projection welding.

The hole is the pilot diameter: 8 mm for M6, 10.5 mm for M8, 12.5 mm for M10, 14.8 mm for M12 and 18.8 mm for M16. DIN 929 data gives an H13 tolerance, for example 12.50 to 12.77 mm at M10; Bossard's data sheet asks for the tighter H11.

M3 0.63 to 1.5 mm, M6 0.88 to 2.5 mm, M8 1 to 3 mm, M10 1.25 to 4 mm, M12 1.5 to 5 mm and M16 2 to 6 mm. At every size the pilot is shorter than the thinnest recommended sheet, so it does not stand proud on the far side.

DIN 929 weld nuts are for bolts below property class 8.8, as both fasten.it and Bossard state. Some sellers quote 8.8; for bolts of class 8.8 to 10.9 use hexagon weld nuts with flange to ISO 21670, which ISO rates for bolts up to class 10.9.

The pilot centres the nut in the hole, holds it in place while welding and keeps weld spatter out of the thread. The three projections concentrate the welding current, so they melt and fuse to the sheet while the rest of the nut stays cooler.

DIN 929 specifies steel with a carbon content of at most 0.25 %, which welds well; other steels by agreement. We also make DIN 929 weld nuts in stainless steel A2 and A4, as in the photo.

Besides the pilot and projections, the hexagon is wider than an ISO 4032 nut from M3 to M14 (17 mm against 16 mm at M10) and the same 24 mm at M16, and the nut is lower from M5 up (8 mm against 8.4 mm at M10).

At least the part thickness plus the sheet plus the nut height m, so the bolt reaches through the whole nut. For M10 on a 2 mm sheet holding a 10 mm part: 10 + 2 + 8 = 20 mm; we suggest a couple of pitches more so the chamfered end clears the nut.
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