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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1-72 UNF Hex Lock Nut A2 Stainless Steel
In stockThis 1 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 packs...RRP From £31.65RRP From £31.65 -
1-64 UNC Hex Jam Nut A4 Stainless Steel
In stockThis 1 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 nut...RRP From £29.70RRP From £29.70 -
1" UNC Nylon Insert Nut A2 Stainless Steel
In stockThis 1" UNC 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...RRP From £23.37RRP From £23.37 -
1-64 UNC Nylon Insert Nut DIN 985 A4 Stainless Steel
In stockThis 1 nylon insert lock nut is manufactured to DIN 985 in A4 stainless steel (316 grade). DIN 985 specifies a hexagon nut with a nylon collar set into the top face, for joints subject to...RRP From £24.20RRP From £24.20 -
1-64 UNC Hex 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 £33.91RRP From £33.91 -
1-64 UNC Hexagon Full Nut A2 Stainless Steel
In stockThis 1 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 packs...RRP From £11.79RRP From £11.79 -
1" BSW Hex Lock Nut A2 Stainless Steel
In stockThis 1" 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 £19.80RRP From £19.80 -
1-64 UNC Hex Jam Nut A2 Stainless Steel
In stockThis 1 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 nut...RRP From £14.18RRP From £14.18 -
1" BSW Hex Full Nut A4 Stainless Steel
Out of stockThis 1" 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 £25.38RRP From £25.38 -
1" BSF Hex Full Nut A4 Stainless Steel
Out of stockThis 1" 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 £15.87RRP £15.87 -
0BA Hexagon Thin Nut A2 Stainless Steel
Out of stockThis 0 hexagon Thin 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 packs...RRP From £4.02RRP From £4.02 -
1" BSF Hex Jam Nut A2 Stainless Steel
In stockThis 1" BSF 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 £19.80RRP From £19.80 -
M24 X 2 Hexagon Full Nut DIN 934 A2 Stainless Steel
In stockThis M24 x 2mm hexagon full nut is manufactured to DIN 934 in A2 stainless steel (304 grade). DIN 934 specifies a standard height hexagon nut, for use with matching bolts, screws, and studding. Property class...RRP From £23.03RRP From £23.03 -
M5 Nylon Insert Nut DIN 985 A4 Stainless Steel
In stockM5 nyloc nut in A4 marins grade stainless steel to DIN 985. The nylon insert grips the bolt thread under vibration and dynamic loading, resisting loosening without thread locking compound - and re-usable after removal. A4...RRP From £3.66RRP From £3.66 -
M16 Hexagon Full Nut DIN 934 A4-80 A4 Stainless Steel
In stockM16 hex nut in A4 marine grade stainless steel to DIN 934. Full-height hexagon form, compatible with all M16 bolts, machine screws, and threaded rod to metric coarse pitch. Suitable for general indoor and outdoor assemblies,...RRP From £9.94RRP From £9.94 -
M12 Hexagon Full Nut DIN 934 A4-80 A4 Stainless Steel
In stockM12 hex nut in A4 marine grade stainless steel to DIN 934. Full-height hexagon form, compatible with all M12 bolts, machine screws, and threaded rod to metric coarse pitch. Suitable for general indoor and outdoor assemblies,...RRP From £5.67RRP From £5.67 -
M12 Nylon Insert Nut DIN 985 A2 Stainless Steel
In stockM12 nyloc nut in A2 stainless steel to DIN 985. The nylon insert grips the bolt thread under vibration and dynamic loading, resisting loosening without thread locking compound - and re-usable after removal. A2 (304 grade)...RRP From £4.87RRP From £4.87 -
M10 Nylon Insert Nut DIN 985 A2 Stainless Steel
In stockM10 nyloc nut in A2 stainless steel to DIN 985. The nylon insert grips the bolt thread under vibration and dynamic loading, resisting loosening without thread locking compound - and re-usable after removal. A2 (304 grade)...RRP From £3.01RRP From £3.01 -
M12 Hexagon Full Nut DIN 934 A2 Stainless Steel
In stockM12 hex nut in A2 stainless steel to DIN 934. Full-height hexagon form, compatible with all M12 bolts, machine screws, and threaded rod to metric coarse pitch. Suitable for general indoor and outdoor assemblies, electronics, and...RRP From £4.75RRP From £4.75 -
M4 Hexagon Full Nut DIN 934 A2 Stainless Steel
In stockM4 hex nut in A2 stainless steel to DIN 934. Full-height hexagon form, compatible with all M4 bolts, machine screws, and threaded rod to metric coarse pitch. Suitable for general indoor and outdoor assemblies, electronics, and...RRP From £2.02RRP From £2.02
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.