Special Offers
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6.3 X 25 Hex Head Self Drilling Screw DIN 7504-K A2 Stainless Steel
In stockRRP From £11.21 -
M8 Flat Washer, Form A DIN 125-A A2 Stainless Steel
In stockRRP From £2.69 -
M8 Nylon Insert Nut DIN 985 A2 Stainless Steel
In stockRRP From £3.23 -
M10 Hexagon Full Nut DIN 934 A2 Stainless Steel
In stockRRP From £3.99
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1/2" UNC Hex Full Nut A2 Stainless Steel
In stockThis 1/2" UNC hexagon full nut is manufactured in A2 stainless steel (304 grade). The full height gives the thread engagement needed to develop the bolt's rated clamping load, and the hexagon flats suit a standard...RRP From £6.33RRP From £6.33 -
1/2" UNC Acorn Nut A2 Stainless Steel
In stockThis 1/2" UNC dome nut is manufactured in A2 stainless steel (304 grade). The closed dome caps the exposed bolt end, removing the sharp thread as a snag or injury risk and giving a finished appearance...RRP From £6.38RRP From £6.38 -
1/2" UNC Nut Nylon Insert A2 Stainless Steel
In stockThis 1/2" UNC nut Nylon Insert is manufactured in A2 stainless steel (304 grade).Typical applications Workshop, maintenance, and repair work Machinery assembly and equipment mounting General fabrication and engineering Brackets, frames, and shelving systems Available in...RRP From £23.67RRP From £23.67 -
1/2" BSW Dome Nut A2 Stainless Steel
Out of stockThis 1/2" BSW dome nut is manufactured in A2 stainless steel (304 grade). The closed dome caps the exposed bolt end, removing the sharp thread as a snag or injury risk and giving a finished appearance...RRP From £8.06RRP From £8.06 -
1/2" UNC Hex Jam Nut A4 Stainless Steel
Out of stockThis 1/2" UNC hexagon thin nut is manufactured in A4 stainless steel (316 grade). At roughly half the height of a full nut, it fits where clearance is limited and is commonly run against a full...RRP From £32.56RRP From £32.56 -
1.1/8" UNF Hex Nut A2 Stainless Steel
In stockThis 1.1/8" UNF hexagon full nut is manufactured in A2 stainless steel (304 grade). The full height gives the thread engagement needed to develop the bolt's rated clamping load, and the hexagon flats suit a standard...RRP From £35.50RRP From £35.50 -
1/2" BSW Hex Full Nut Whitworth A4 Stainless Steel
In stockThis 1/2" BSW hexagon full nut is manufactured in A4 stainless steel (316 grade). The full height gives the thread engagement needed to develop the bolt's rated clamping load, and the hexagon flats suit a standard...RRP From £18.66RRP From £18.66 -
1/2" BSW Hex Full Nut Whitworth A2 Stainless Steel
In stockThis 1/2" BSW hexagon full nut is manufactured in A2 stainless steel (304 grade). The full height gives the thread engagement needed to develop the bolt's rated clamping load, and the hexagon flats suit a standard...RRP From £29.56RRP From £29.56 -
1.3/8" BSF Hex Full Nut A4 Stainless Steel
In stockThis 1.3/8" BSF hexagon full nut is manufactured in A4 stainless steel (316 grade). The full height gives the thread engagement needed to develop the bolt's rated clamping load, and the hexagon flats suit a standard...RRP From £16.03RRP From £16.03 -
1.1/4" BSW Hex Lock Nut A2 Stainless Steel
In stockThis 1.1/4" BSW hex Lock Nut is manufactured in A2 stainless steel (304 grade).Typical applications Workshop, maintenance, and repair work Machinery assembly and equipment mounting General fabrication and engineering Brackets, frames, and shelving systems Available in...RRP From £120.00RRP From £120.00 -
1.3/4" UNC Hex Full Nut A2 Stainless Steel
In stockThis 1.3/4" UNC hexagon full nut is manufactured in A2 stainless steel (304 grade). The full height gives the thread engagement needed to develop the bolt's rated clamping load, and the hexagon flats suit a standard...RRP From £19.98RRP From £19.98 -
1.1/8" UNC Hex Full Nut A2 Stainless Steel
In stockThis 1.1/8" UNC hexagon full nut is manufactured in A2 stainless steel (304 grade). The full height gives the thread engagement needed to develop the bolt's rated clamping load, and the hexagon flats suit a standard...RRP From £25.28RRP From £25.28 -
1.1/2" UNF Hex Lock Nut A2 Stainless Steel
Out of stockThis 1.1/2" UNF hex Lock Nut is manufactured in A2 stainless steel (304 grade).Typical applications Workshop, maintenance, and repair work Machinery assembly and equipment mounting General fabrication and engineering Brackets, frames, and shelving systems Available in...RRP From £4.02RRP From £4.02 -
1.1/8" UNC Hex Jam Nut A2 Stainless Steel
Out of stockThis 1.1/8" UNC hexagon thin nut is manufactured in A2 stainless steel (304 grade). At roughly half the height of a full nut, it fits where clearance is limited and is commonly run against a full...RRP From £13.13RRP From £13.13 -
1.1/8" BSW Hex Full Nut A4 Stainless Steel
In stockThis 1.1/8" BSW hexagon full nut is manufactured in A4 stainless steel (316 grade). The full height gives the thread engagement needed to develop the bolt's rated clamping load, and the hexagon flats suit a standard...RRP From £32.53RRP From £32.53 -
1.1/2" UNC Hex Nut A4 Stainless Steel
In stockThis 1.1/2" UNC hexagon full nut is manufactured in A4 stainless steel (316 grade). The full height gives the thread engagement needed to develop the bolt's rated clamping load, and the hexagon flats suit a standard...RRP From £36.05RRP From £36.05 -
1.1/4" Whitworth Hexagon Full Nut A2 Stainless Steel
Out of stockThis 1.1/4" whitworth Hexagon Full Nut is manufactured in A2 stainless steel (304 grade).Typical applications Workshop, maintenance, and repair work Machinery assembly and equipment mounting General fabrication and engineering Brackets, frames, and shelving systems Available in...RRP From £3.75RRP From £3.75 -
1.1/8" BSW Hex Full Nut A2 Stainless Steel
Out of stockThis 1.1/8" BSW hexagon full nut is manufactured in A2 stainless steel (304 grade). The full height gives the thread engagement needed to develop the bolt's rated clamping load, and the hexagon flats suit a standard...RRP From £11.71RRP From £11.71 -
1.1/2" BSW Hex Full Nut A4 Stainless Steel
In stockThis 1.1/2" BSW hexagon full nut is manufactured in A4 stainless steel (316 grade). The full height gives the thread engagement needed to develop the bolt's rated clamping load, and the hexagon flats suit a standard...RRP From £12.46RRP From £12.46 -
1.1/4" BSF Hex Full Nut A4 Stainless Steel
In stockThis 1.1/4" BSF hexagon full nut is manufactured in A4 stainless steel (316 grade). The full height gives the thread engagement needed to develop the bolt's rated clamping load, and the hexagon flats suit a standard...RRP From £20.44RRP From £20.44 -
1-72 UNF Nylon Insert Nut A4 Stainless Steel
In stockThis 1 nylon insert lock nut is manufactured in A4 stainless steel (316 grade). The nylon collar is undersized and deforms around the thread as the nut is run on, gripping it and resisting loosening under...RRP From £43.57RRP From £43.57 -
1.1/2" UNC Hexagon Full Nut A2 Stainless Steel
In stockThis 1.1/2" UNC hexagon full nut is manufactured in A2 stainless steel (304 grade).Typical applications Workshop, maintenance, and repair work Machinery assembly and equipment mounting General fabrication and engineering Brackets, frames, and shelving systems Available in...RRP From £16.68RRP From £16.68 -
1-72 UNF Nylon Insert Nut A2 Stainless Steel
In stockThis 1 nylon insert lock nut is manufactured in A2 stainless steel (304 grade). The nylon collar is undersized and deforms around the thread as the nut is run on, gripping it and resisting loosening under...RRP From £5.05RRP From £5.05 -
1-72 UNF Hex Full Nut A4 Stainless Steel
In stockThis 1 hexagon full nut is manufactured in A4 stainless steel (316 grade). The full height gives the thread engagement needed to develop the bolt's rated clamping load, and the hexagon flats suit a standard spanner...RRP From £75.76RRP From £75.76 -
1-72 UNF Hex Nut A2 Stainless Steel
In stockThis 1 hexagon full nut is manufactured in A2 stainless steel (304 grade). The full height gives the thread engagement needed to develop the bolt's rated clamping load, and the hexagon flats suit a standard spanner...RRP From £23.33RRP From £23.33
Stainless steel nuts in A2 (304) and A4 (316), from M1 to M64, plus imperial UNC, UNF, BSW, BSF and BA threads. A few sizes also come in duplex (1.4462) stainless.
- Hexagon nuts: full nuts to DIN 934 and ISO 4032, thin nuts to DIN 439 and ISO 4035, jam nuts, and left hand thread nuts.
- Locking nuts: nyloc (nylon insert) nuts to DIN 985 and DIN 982, all-metal prevailing torque nuts, castle nuts for split pins, and flange nyloc nuts.
- Dome nuts: domed cap nuts to DIN 1587 and domed nyloc nuts to DIN 986.
- Wing, flange and square nuts, including serrated and non-serrated flange nuts to DIN 6923.
- Specialist nuts: connector nuts for threaded rod, weld nuts, eye nuts, shear nuts, channel and cage nuts, T-nuts and sleeve nuts.
Use a full nut for general bolted joints, a locking nut where vibration could loosen it, and a dome nut to cover an exposed thread end.
Frequently asked questions
What is a nyloc nut?
A nyloc nut, also called a nylon insert lock nut, is a hex nut with a ring of nylon set into the top. The nylon grips the bolt thread and resists vibration that would loosen a plain nut over time. Simfix stocks nyloc nuts to DIN 985 and the taller DIN 982 in A2 (304) and A4 (316), from M2 to M36, plus flange and domed versions.
What is a dome nut used for?
A dome nut, made to DIN 1587, has a rounded cap that fully covers the end of the bolt thread. It gives a clean, snag-free finish on exposed threads and protects the thread tip. Simfix stocks dome nuts in A2 (304) from M3 to M30 and A4 (316) from M3 to M36, plus domed nyloc nuts (DIN 986) in A2.
What size nut fits an M8 bolt?
An M8 bolt takes an M8 nut; the number is the nominal thread diameter in millimetres, which matches across bolts, set screws and nuts of the same size. Standard metric nuts have a coarse thread, so check the pitch if your bolt has a fine thread. Simfix stocks M8 full, thin, nyloc, dome, flange, wing and castle nuts in both A2 (304) and A4 (316).
Should I use A2 or A4 nuts?
Use A2 (304) nuts for everyday indoor and general outdoor use. Use A4 (316) nuts near the coast, around pools or anywhere salt or chlorine is present, since A4 contains molybdenum, which resists chloride pitting that A2 does not. Match the nut grade to the bolt.
Sizes, grades and pack quantities vary by product type. Check the individual product listing for the exact specification and current availability.