Back Nuts, Sizes From 3/8" to 2" BSP

£ GBP

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Back Nuts

Brass, plastic and alloy flanged back nuts with British Standard Pipe Threads (BSP).

Typical back nut applications
Back-nut Size	Application
1/2 inch BSP	Bathroom basin and kitchen sink taps
3/4 inch BSP	Bath taps
1-1/4 inch BSP	Wash hand basin / bathroom sink wastes
1-1/2 inch BSP	Kitchen sink wastes and bath wastes

** BSP thread sizes are measured a special way - have a look at our information page for more details **

1-1/4" BSP Alloy Flanged Back Nut
This 1-1/4 inch BSP alloy flanged back nut suits bathroom wash hand basin / bathroom sink waste fittings.
The outside diameter of the male 1-1/4 inch BSP thread that this backnut fits onto measures 41.91 mm / 1.650 inch.
£3.00
1-1/4" BSP Alloy Flanged Back Nut
£3.00
1-1/2" BSP Alloy Flanged Back Nut
This 1-1/2 inch BSP alloy flanged back nut suits bath or kitchen sink waste fittings.
The outside diameter of the male 1-1/2 inch BSP thread that this backnut fits onto measures 47.80 mm / 1.882 inch.
£3.40
1-1/2" BSP Alloy Flanged Back Nut
£3.40
3/8" BSP Brass Flanged Back Nut
The outside diameter of the male 3/8 inch BSP thread that this backnut fits onto measures 16.66 mm / 0.656 inch.
£1.54
3/8" BSP Brass Flanged Back Nut
£1.54
1/2" BSP Brass Flanged Back Nut
This 1/2 inch BSP brass flanged back nut suits traditional kitchen sink / bathroom basin taps.
The outside diameter of the male 1/2 inch BSP thread that this backnut fits onto measures 20.99 mm / 0.825 inch.
£1.14
1/2" BSP Brass Flanged Back Nut
£1.14
1/2" BSP Brass Wide Flanged Back Nut
This 1/2 inch BSP brass wide flanged back nut suits traditional kitchen sink / bathroom basin taps.
The outside diameter of the male 1/2 inch BSP thread that this backnut fits onto measures 20.99 mm / 0.825 inch.
£1.58
1/2" BSP Brass Wide Flanged Back Nut
£1.58
3/4" BSP Brass Flanged Back Nut
This 3/4 inch BSP brass flanged back nut suits traditional bath taps.
The outside diameter of the male 3/4 inch BSP thread that this backnut fits onto measures 26.44 mm / 1.041 inch.
Bathroom basin and kitchen sink taps use a nut with a smaller 1/2 inch BSP thread.
£1.48
3/4" BSP Brass Flanged Back Nut
£1.48
3/4" BSP Brass Wide Flanged Back Nut
This 3/4 inch BSP brass wide flanged back nut suits traditional bath taps.
The outside diameter of the male 3/4 inch BSP thread that this backnut fits onto measures 26.44 mm / 1.041 inch.
Bathroom basin and kitchen sink taps use a nut with a smaller 1/2 inch BSP thread.
£1.66
3/4" BSP Brass Wide Flanged Back Nut
£1.66
1" BSP Brass Flanged Back Nut
The outside diameter of the male 1 inch BSP thread that this backnut fits onto measures 33.25 mm / 1.309 inch.
This nut isn't used for kitchen or bathroom taps, please don't buy it for that purpose.
£2.32
1" BSP Brass Flanged Back Nut
£2.32
1-1/4" BSP Brass Flanged Back Nut
This 1-1/4 inch BSP brass flanged back nut suits bathroom wash hand basin / bathroom sink waste fittings.
The outside diameter of the male 1-1/4 inch BSP thread that this backnut fits onto measures 41.91 mm / 1.650 inch.
£3.42
1-1/4" BSP Brass Flanged Back Nut
£3.42
1-1/2" BSP Brass Flanged Back Nut
This 1-1/2 inch BSP brass flanged back nut suits bath or kitchen sink waste fittings.
The outside diameter of the male 1-1/2 inch BSP thread that this backnut fits onto measures 47.80 mm / 1.882 inch.
£3.49
1-1/2" BSP Brass Flanged Back Nut
£3.49
2" BSP Brass Flanged Back Nut
The outside diameter of the male 2 inch BSP thread that this backnut fits onto measures 59.61 mm / 2.347 inch.
£7.16
2" BSP Brass Flanged Back Nut
£7.16
1/2" BSP Plastic Flanged Back Nut
This 1/2 inch BSP brass flanged back nut suits traditional kitchen sink / bathroom basin taps (colour may vary : black / white).
The outside diameter of the male 1/2 inch BSP thread that this backnut fits onto measures 20.99 mm / 0.825 inch.
£0.71
1/2" BSP Plastic Flanged Back Nut
£0.71