FORM F

FORM F

Form F washers are flat metric fasteners governed by British Specification BS 4320. They are explicitly defined as having a large outside diameter (OD) and a normal thickness profile, historically categorised as "black" or heavy-series washers meant for structural and outdoor engineering tasks.

Form F vs Form C

In terms of pure physical measurements, a Form F washer shares identical dimensions with a Form C washer. However, they are separated by their historical industry finish and modern material usage:

  • Form C: Typically manufactured from bright mild steel and finished with Bright Zinc Plating (BZP) for general interior or light-duty tasks.
  • Form F: Traditionally categorized as un-machined "black" steel but overwhelmingly supplied in modern commercial trade with a Hot-Dip Galvanised (HDG) finish to survive structural outdoor use.

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Code Description Price Quantity
RWM12F M12 1/2 FORM F WASHER 28 OD X 2.5
112 In Stock for despatch
£28.65 (exc VAT) per HUND
£34.38 (inc VAT)
-
+
RWM12FG M12 1/2 FORM F WASHER GALV 28 OD X 2.5
370 In Stock for despatch
£28.50 (exc VAT) per HUND
£34.20 (inc VAT)
-
+
RWM12FP M12 1/2 FORM F WASHER 28 OD X 2.5 ZINC
Out of Stock
£11.50 (exc VAT) per HUND
£13.80 (inc VAT)
-
+
RWM16F M16 5/8 FORM F WASHER 34 OD X 3.0
Out of Stock
£35.00 (exc VAT) per HUND
£42.00 (inc VAT)
-
+
RWM16FG M16 5/8 FORM F WASHERS 34 OD X 3 GALV
Out of Stock
£50.00 (exc VAT) per HUND
£60.00 (inc VAT)
-
+
RWM16FP M16 5/8 FORM F WASHER 34 OD X 3.0 ZINC
Out of Stock
£17.50 (exc VAT) per HUND
£21.00 (inc VAT)
-
+
RWM16FZY M16 5/8 FORM F WASHER 34 OD X 3.0 ZINC & YELLOW
Out of Stock
£16.80 (exc VAT) per HUND
£20.16 (inc VAT)
-
+
RWM20FP M20 3/4 FORM F WASHER 39 OD X 3.0 ZINC
Out of Stock
£45.67 (exc VAT) per HUND
£54.80 (inc VAT)
-
+
RWM22F M22 7/8 FORM F WASHER 44 OD X 3.0
Out of Stock
£27.50 (exc VAT) per HUND
£33.00 (inc VAT)
-
+
RWM22FP M22 7/8 FORM F WASHER 44 OD X 3.0 ZINC
2 In Stock for despatch
£78.75 (exc VAT) per HUND
£94.50 (inc VAT)
-
+
RWM27F M27 1" FORM F WASHER 56 OD X 4.0
Out of Stock
£1,000.00 (exc VAT) per HUND
£1,200.00 (inc VAT)
-
+
RWM27FP M27 1" FORM F WASHER 56 OD X 4.0 ZINC
Out of Stock
£42.60 (exc VAT) per HUND
£51.12 (inc VAT)
-
+
RWM30F M30 1.1/8 FORM f WASHER 60 OD X 4.0
52 In Stock for despatch
£295.80 (exc VAT) per HUND
£354.96 (inc VAT)
-
+
RWM30FG M30 1.1/8 FORM F WASHER 60 OD X 4 GALV
Out of Stock
£198.80 (exc VAT) per HUND
£238.56 (inc VAT)
-
+
RWM36FG M36 1.3/8 FORM F WASHER GALV
16 In Stock for despatch
£310.00 (exc VAT) per HUND
£372.00 (inc VAT)
-
+