Flat Head Square Body Rivet Nut
Rivet Nuts (Insert Nuts)

Flat Head Square Body Rivet Nut

Flat head, round knurled body, open or closed end. M3 to M16, carbon steel, zinc plated.

Section
Rivet nuts
Type
Steel rivet nuts
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Overview

A rivet nut (insert nut) gives a strong, reusable thread in sheet metal, tube or plastic that is too thin to tap. It is fitted from one side with a hand or pneumatic tool. The wide flat head spreads the load and covers slightly oversized holes. The square body sits in a square hole, so the nut cannot turn when the bolt is tightened. The open end lets a longer screw pass right through.

Available in M5, M6, M8 with grip ranges from 0.5 mm to 4 mm. Each part number covers a set range of sheet thickness and has its own overall length (L), shown in the table. Dimensions follow the supplier catalogue (YLB 2025).

Specifications

BrandSGPFS
Part no. seriesSGFS01OE… (open end)
ThreadsM5, M6, M8
Grip range0.5 mm to 4 mm
Length (L)11.2 mm to 18.6 mm (open end)
HeadFlat head
BodySquare body
EndOpen end
MaterialCarbon steel, zinc plated (stainless steel on request)

Sizes & part numbers

All dimensions in mm. One row per grip range. The 2D drawing shows where each letter is measured.

Part no.ThreadMaterialGrip range
min–max		Hole size
+0.1 / 0		Body D
across flats
+0.07 / −0.10		Head BHead KLength L
±0.30
SGFS01OEM51120515M5C0.5–1.57.006.9010.500.6011.20
SGFS01OEM51271530C1.5–3.07.006.9010.500.6012.70
SGFS01OEM61430525M6C0.5–2.59.008.9014.000.8014.30
SGFS01OEM61722540C2.5–4.09.008.9014.000.8017.20
SGFS01OEM81861030M8C1.0–3.011.0010.9017.501.3018.60

Material: C = Carbon steel. Part number = SG + type + grade (01 carbon steel, 02 aluminium, 034 stainless steel SS 304) + end (OE open, CE closed) + thread + length + grip range. Example: SGFK01OEM6150525 = flat head knurled, carbon steel, open end, M6, length 15, grip 0.5–2.5 mm.

How it works

A rivet nut gives a strong, reusable thread in sheet metal, tube or plastic that is too thin to tap, and it is fitted from one side only. Here is how this nut goes in.

1 Make the holeDrill or punch a square hole tothe size in the table. Noaccess to the back is needed.2 Insert the nutPush the nut in until the headsits on the sheet.3 Set itThe tool pulls the thread up:the thin wall behind the sheetfolds into a tight collar andclamps.4 FastenScrew in the bolt to fix thepart. The thread can be usedagain and again.
Installation in four steps (simplified illustration).
no spin

Square body

The square body sits in a square hole, so the nut cannot turn when the bolt is tightened. Use it where a punched square hole is easier than a hex hole.

thin sheetthick sheet

Choosing the grip

Each part number sets in a range of sheet thickness (the grip). Pick the part whose grip covers your sheet: too thin and the collar will not clamp, too thick and the nut cannot fold. The hole size is in the table.

Open end

The thread runs right through, so a longer bolt can pass through the nut.

Head

Flat head: a wide head that spreads the load and covers the hole edge.

Setting tools

Set with a hand, pneumatic-hydraulic or battery tool fitted with the matching mandrel. See our riveting tools.

Key features

  • Square body locks in a square hole
  • High resistance to turning
  • Through thread

Applications

Electrical panels and enclosuresAutomotiveFurnitureSolar structures
Need a size, grade or finish not listed?We also supply special and non-standard parts to drawing.Send enquiry

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