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DIN 928 · Projection weld

Square Weld Nuts Manufacturer in India

Four corners, four welds. We make square weld nuts to DIN 928 in low-carbon steel and stainless A2. Below: the nut to scale, the dimension table, the sheet hole and thickness, square against hex weld nuts, bolt length and a finder.

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  • ISO 9001:2015 certified manufacturer
  • Steel C ≤ 0.25 %
  • Stainless A2
  • EN 10204 3.1 / 3.2
DIN 928 steel square weld nuts with four corner weld projections
DIN 928 M4 – M16 Sheet 0.75 – 6 mm 4 corner projections
Overview

DIN 928 Square Weld Nuts: Manufacturer & Distributor

A square weld nut turns a hole in thin sheet into a strong, permanent thread. Four projections, one at each corner, carry the welding current and fuse the nut to the sheet in one shot.

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

How it is built

One face carries the four corner projections and goes against the sheet; the opposite face has a round collar. The sheet hole is small, at most 1.05 times the thread diameter. For a nut with a locating pilot see hex weld nuts (DIN 929); for plain square nuts square nuts.

DIN 928 4 projections M4 – M16 Coarse & fine thread Stainless A2
Square weld nuts at a glance
Standard
DIN 928:2013
Sizes
M4–M16, fine thread 8–16 mm
Sheet hole
≤ 1.05 d (10.5 mm at M10)
Sheet
0.75–1.5 mm (M4) to 2–6 mm (M16)
Bolts
Property class below 8.8
Material
Steel C ≤ 0.25 %, A2
Related
Hex weld nuts, square nuts
DIN 928 square weld nut M10 to scale: 17 mm square, 8 mm high, four weld projections 1.2 mm high on the corners of the face that goes against the sheet, and a round collar at least 15.6 mm across on the opposite face DIN 928 square weld nut M10, to scale sheet m 7.64–8 projection h 1.1–1.3 collar ⌀ ≥ 15.6, h2 1.25–2.2 Side view across flats Weld face: 4 corner projections (projection shape schematic) Weld face EXOTIC ALLOY
A DIN 928 M10 square weld nut to scale, before welding. The four corner projections touch the sheet; the collar is on the other face.
Specification

Square Weld Nut Specification

The range we manufacture and distribute.

StandardDIN 928
SizesM4, 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 on request
BoltsProperty class below 8.8
FinishPlain, ready for welding
CertificationEN 10204 3.1; 3.2 on request
SupplyBulk for feeders, or boxed by size
DIN 928

DIN 928 Square Weld Nut Dimensions

Coarse thread, mm.

SizePitch PSpanner s
max / min		Across corners e minHeight m
max / min		Projection h
max / min		Projection width bCollar ⌀ d3 minCollar height h2kg / 1000
M40.77 / 6.6493.5 / 3.20.7 / 0.50.86.40.4–1.30.81
M50.89 / 8.64124.2 / 3.90.9 / 0.718.20.6–1.51.7
M6110 / 9.64135 / 4.70.9 / 0.71.29.10.7–1.82.4
M81.2514 / 13.57186.5 / 6.141.1 / 0.91.512.81.1–26.5
M101.517 / 16.57228 / 7.641.3 / 1.11.815.61.25–2.211.3
M121.7519 / 18.48259.5 / 9.141.5 / 1.3217.41.75–316.6
M14222 / 21.482811.4 / 10.97 *1.5 / 1.32.520.41.75–3.226.7
M16224 / 23.483213 / 12.571.7 / 1.52.522.42–435.8

Values agreed by globalfastener (2013 and 2000 editions), fasten.it (2013) and Aspen Fasteners. m is the overall height including the collar; h and b are the height and width of the weld projections before welding; d3 and h2 describe the round collar on the free face. * M14: fasten.it, Aspen and globalfastener's 2000 table give m 11.4 mm; globalfastener's 2013 table and McMaster-Carr give 11 mm. We confirm M14 on order. Mass of 1000 steel nuts; globalfastener's 2013 table shows 16.5 kg at M12.

Hole & sheet

Square Weld Nut Hole Size and Sheet Thickness

The sheet hole, the sheet each size suits, and how it compares with a DIN 929 hex weld nut, mm.

SizeSheet hole d2 maxSheet thickness
min – max		Square DIN 928
s / m		Hex DIN 929
s / m		Projections
928 / 929
M44.20.75 – 1.57 / 3.59 / 3.54 / 3
M55.250.88 – 29 / 4.210 / 44 / 3
M66.30.88 – 2.510 / 511 / 54 / 3
M88.41 – 314 / 6.514 / 6.54 / 3
M1010.51.25 – 417 / 817 / 84 / 3
M1212.61.5 – 519 / 9.519 / 104 / 3
M1414.72 – 622 / 11.422 / 114 / 3
M1616.82 – 624 / 1324 / 134 / 3

Sheet hole d2 max = 1.05 d (globalfastener and fasten.it). McMaster-Carr lists larger holes at every size except M8 and M10, up to 2.1 mm larger; we follow the DIN value. Sheet thickness from fasten.it, the same ranges as for DIN 929 hex weld nuts.

Sheet thickness for DIN 928 square weld nuts, M4 0.75 to 1.5 mm up to M16 2 to 6 mm, with the projection height marked Sheet thickness for each size, mm (bar) and projection height h (dot) 0 1 2 3 4 5 6 mm M4 M4: sheet 0.75 to 1.5 mm, projection 0.6 mm 0.75–1.5 M5 M5: sheet 0.88 to 2 mm, projection 0.8 mm 0.88–2 M6 M6: sheet 0.88 to 2.5 mm, projection 0.8 mm 0.88–2.5 M8 M8: sheet 1 to 3 mm, projection 1 mm 1–3 M10 M10: sheet 1.25 to 4 mm, projection 1.2 mm 1.25–4 M12 M12: sheet 1.5 to 5 mm, projection 1.4 mm 1.5–5 M14 M14: sheet 2 to 6 mm, projection 1.4 mm 2–6 M16 M16: sheet 2 to 6 mm, projection 1.6 mm 2–6 sheet min–max projection h EXOTIC ALLOY
From 0.75 mm sheet at M4 to 6 mm at M16. Hover a bar for the values.
Square vs hex

Square Weld Nut or Hex Weld Nut

M8 weld faces to scale: DIN 928 square weld nut with four corner projections and DIN 929 hexagon weld nut with three projections and a pilot, both 14 mm across flats M8 weld faces to scale: square DIN 928 vs hex DIN 929 DIN 928 square: 4 projections s 14, e ≥ 18, m 6.5, sheet hole ≤ 8.4 DIN 929 hex: 3 projections + pilot s 14, e ≥ 15.38, m 6.5, hole = pilot 10.5 Projection shapes schematic; outlines, holes and pilot to scale. EXOTIC ALLOY
Same spanner at M8, different welds. Four corner projections against three and a pilot.

DIN 928 square

  • Four projections, one per corner.
  • Small sheet hole, at most 1.05 d.
  • Round collar on the free face; it does not enter the hole.

DIN 929 hex

  • Three projections on alternate corners.
  • A pilot that sits in a larger hole and locates the nut.
  • Same spanner from M8 up; wider at M4 to M6. See hex weld nuts.

Note: some sellers describe the DIN 928 collar as a pilot that guides the nut into the hole. In the DIN 928 drawings it is on the face away from the sheet and wider than the sheet hole.

Bolting

Bolt Grade and Bolt Length for Square Weld Nuts

Section through an M10 joint: a 10 mm part bolted to a 2 mm sheet with a welded DIN 928 nut; the projections are welded to the sheet, the collar faces away, the sheet hole is at most 10.5 mm and the bolt is at least 20 mm long Installed M10: sheet hole, welded nut and bolt length (section) part sheet DIN 928 nut, welded collar faces away from the sheet part 10 sheet 2 nut m 8 L ≥ 20 sheet hole ≤ 10.5 (d2) Example M10: 10 mm part + 2 mm sheet + 8 mm nut = 20 mm under the head. Collar drawn at its minimum height. EXOTIC ALLOY
The bolt comes from the other side of the sheet. It passes through the part, the sheet hole and 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.
  • Bolt grade: below property class 8.8 (Bossard). For 8.8 to 10.9 use flanged weld nuts to ISO 21670.
  • Welding current, force and time depend on the machine and sheet: set them with trial welds.
Finder

Square 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. Sheet hole up to d2 max = 1.05 d. Shortest bolt = part + sheet + nut height m max; suggested = that plus two pitches. Bolt lengths are under the head. Mass is for steel.

Result
10.5
mm sheet hole, max
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
Projections / collar:h 1.2, collar ⌀ ≥ 15.6 mm
Mass:≈ 11.3 kg
Designation:1000 pcs square weld nut DIN 928 – M10, steel C ≤ 0.25 %, plain

Materials

Square Weld Nut Materials & Finishes

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

DIN 928 names steel with at most 0.25 % carbon (globalfastener; Würth lists the same) 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 928 material.

1010
Stainless
A2 · A4

For stainless sheet.

304316
Hex weld nuts
DIN 929

With a locating pilot.

Hex weld nuts
Manufacturing

How Our Square Weld Nuts Are Made

1

Wire

Low-carbon steel or stainless, certified by heat.

2

Form

Square body, corner projections and collar cold formed.

3

Tap

Thread tapped through.

4

Gauge

Projection height and width checked.

5

Clean

Degreased, left plain for welding.

6

Inspect

Thread gauged, lot certified.

Applications

Where Our Square Weld Nuts Are Used

Vehicles

Body panels, brackets and seat frames.

Trailers

Chassis and body fixings.

Farm machinery

Guards, panels and frames.

Enclosures

Cabinets, mounted from one side.

Appliances

Sheet-metal housings.

Construction equipment

Covers, steps and mountings.

Quality & testing

Square Weld Nut Inspection & Certification

CheckMethodApplied to
ThreadGO / NOT GO plug gaugesEvery lot
s, e, mCalipers, micrometerEvery lot
Projections h, bHeight gauge, opticalEvery 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

Square Weld Nut Questions, Answered

A square nut made to be projection welded onto sheet metal, to DIN 928 from M4 to M16. One face carries four weld projections, one on each corner, that melt and fuse to the sheet; the opposite face has a round collar. A bolt can then be fitted from the other side of the sheet without holding a nut.

DIN 928 gives the sheet hole d2 as at most 1.05 times the thread diameter: 6.3 mm for M6, 8.4 mm for M8, 10.5 mm for M10, 12.6 mm for M12 and 16.8 mm for M16. Some catalogues list larger holes, up to 2.1 mm larger; we follow the DIN value.

M4 0.75 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 M14 and M16 2 to 6 mm. These are the same ranges as for DIN 929 hexagon weld nuts of the same size.

Bolts below property class 8.8, as Bossard states for its DIN 928 nuts and DIN 929 states for hexagon weld nuts. For class 8.8 to 10.9 bolts use hexagon weld nuts with flange to ISO 21670.

A DIN 928 square weld nut has four corner projections and a sheet hole no bigger than 1.05 d; a DIN 929 hex weld nut has three projections and a pilot that sits in a larger hole (10.5 mm at M8 against 8.4 mm). From M8 up both take the same spanner; at M4 to M6 the hex nut is wider.

Not one that goes into the sheet. In the DIN 928 drawings the round collar sits on the face away from the sheet and is wider than the sheet hole (at least 15.6 mm at M10 against a 10.5 mm hole). Some sellers call it a pilot; for a nut that locates in its hole, use a DIN 929 hexagon weld nut.

Steel with a carbon content of at most 0.25 %, which welds well; other steels by agreement. We also supply them in stainless steel A2 for welding to stainless sheet.

At least the part plus the sheet plus the nut height m: for M10 holding a 10 mm part to a 2 mm sheet, 10 + 2 + 8 = 20 mm. We suggest about two pitches more so the chamfered end clears the nut.
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