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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M6 Hexagon Weld Nut DIN 929 A4 Stainless Steel
In stockThis M6 hexagon weld nut is manufactured to DIN 929 in A4 stainless steel (316 grade). DIN 929 specifies a hexagon nut with projections formed for resistance welding, giving a captive thread on a panel. The...RRP From £2.75RRP From £2.75 -
M6 Hexagon Weld Nut DIN 929 A2 Stainless Steel
In stockThis M6 hexagon weld nut is manufactured to DIN 929 in A2 stainless steel (304 grade). DIN 929 specifies a hexagon nut with projections formed for resistance welding, giving a captive thread on a panel. The...RRP From £3.61RRP From £3.61 -
M6 Hexagon Thin Nut ISO 4035-B A2 Stainless Steel
In stockThis M6 hexagon thin nut is manufactured to ISO 4035-B in A2 stainless steel (304 grade). ISO 4035-B specifies a reduced height hexagon nut, for locking and for confined clearances. At roughly half the height of...RRP From £4.26RRP From £4.26 -
M6 Hexagon Nut , Type B DIN 6330 A4 Stainless Steel
In stockThis M6 high hexagon nut is manufactured to DIN 6330 in A4 stainless steel (316 grade). DIN 6330 specifies a hexagon nut of increased height, around 1.5 times standard, for greater thread engagement. The extra height...RRP From £21.20RRP From £21.20 -
M6 Hexagon Nut , Type B DIN 6330 A2 Stainless Steel
In stockThis M6 high hexagon nut is manufactured to DIN 6330 in A2 stainless steel (304 grade). DIN 6330 specifies a hexagon nut of increased height, around 1.5 times standard, for greater thread engagement. The extra height...RRP From £8.53RRP From £8.53 -
M6 Hexagon Thin Nut ISO 4035-B A4 Stainless Steel
In stockThis M6 hexagon thin nut is manufactured to ISO 4035-B in A4 stainless steel (316 grade). ISO 4035-B specifies a reduced height hexagon nut, for locking and for confined clearances. At roughly half the height of...RRP From £7.67RRP From £7.67 -
M6 Hexagon Thin Nut DIN 439-B A4 Stainless Steel
In stockThis M6 hexagon thin nut is manufactured to DIN 439-B in A4 stainless steel (316 grade). DIN 439-B specifies a reduced height hexagon nut, for locking and for confined clearances. At roughly half the height of...RRP From £3.34RRP From £3.34 -
M6 Hexagon Thin Nut DIN 439-B Left Hand Thread A2 Stainless Steel
In stockThis M6 hexagon thin nut is manufactured to DIN 439-B in A2 stainless steel (304 grade). DIN 439-B specifies a reduced height hexagon nut, for locking and for confined clearances. At roughly half the height of...RRP From £5.55RRP From £5.55 -
M6 Hexagon Thin Nut DIN 439-B A2 Stainless Steel
In stockThis M6 hexagon thin nut is manufactured to DIN 439-B in A2 stainless steel (304 grade). DIN 439-B specifies a reduced height hexagon nut, for locking and for confined clearances. At roughly half the height of...RRP From £4.09RRP From £4.09 -
M6 Hexagon Full Nut DIN 934 Left Hand Thread A4 Stainless Steel
In stockThis M6 hexagon full nut is manufactured to DIN 934 in A4 stainless steel (316 grade). DIN 934 specifies a standard height hexagon nut, for use with matching bolts, screws, and studding. Property class A4-70 indicates...RRP From £6.07RRP From £6.07 -
M6 Hexagon Full Nut DIN 934 Duplex Stainless Steel
In stockThis M6 hexagon full nut is manufactured to DIN 934 in stainless steel. DIN 934 specifies a standard height hexagon nut, for use with matching bolts, screws, and studding. The full height gives the thread engagement...RRP From £8.65RRP From £8.65 -
M6 Hexagon Full Nut DIN 934 Left Hand Thread A2 Stainless Steel
In stockThis M6 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 A2-70 indicates...RRP From £5.63RRP From £5.63 -
M6 Hexagon Full Nut ISO 4032 A4 Stainless Steel
In stockThis M6 hexagon full nut is manufactured to ISO 4032 in A4 stainless steel (316 grade). ISO 4032 specifies a standard height hexagon nut, for use with matching bolts, screws, and studding. Property class A4-80 indicates...RRP From £11.51RRP From £11.51 -
M6 Hexagon Flange Nut DIN 6923 Serrated Flange A4 Stainless Steel
In stockThis M6 hex flange nut is manufactured to DIN 6923-Z in A4 stainless steel (316 grade). DIN 6923-Z specifies a hexagon nut with an integral flange on the bearing face, spreading the clamping load without a...RRP From £2.70RRP From £2.70 -
M6 Hexagon Full Nut DIN 934 A4-70 A4 Stainless Steel
In stockThis M6 hexagon full nut is manufactured to DIN 934 in A4 stainless steel (316 grade). DIN 934 specifies a standard height hexagon nut, for use with matching bolts, screws, and studding. Property class A4-70 indicates...RRP From £11.03RRP From £11.03 -
M6 Hexagon Flange Nut DIN 6923 Non-Serrated Flange A2 Stainless Steel
In stockThis M6 hex flange nut is manufactured to DIN 6923 in A2 stainless steel (304 grade). DIN 6923 specifies a hexagon nut with an integral flange on the bearing face, spreading the clamping load without a...RRP From £3.29RRP From £3.29 -
M6 Hexagon Full Nut DIN 934 A2-80 A2 Stainless Steel
In stockThis M6 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 A2-80 indicates...RRP From £2.90RRP From £2.90 -
M6 Hexagon Flange Nut DIN 6923 Serrated Flange A2 Stainless Steel
In stockThis M6 hex flange nut is manufactured to DIN 6923-Z in A2 stainless steel (304 grade). DIN 6923-Z specifies a hexagon nut with an integral flange on the bearing face, spreading the clamping load without a...RRP From £2.14RRP From £2.14 -
M6 Hexagon Collar Nut DIN 6331 A2 Stainless Steel
In stockThis M6 hexagon collar nut is manufactured to DIN 6331 in A2 stainless steel (304 grade). DIN 6331 specifies a hexagon nut with an integral flanged collar, for spreading the clamping load without a separate washer....RRP From £8.18RRP From £8.18 -
M6 Hex Flange Nylon Insert Nut DIN 6926 Serrated Flange A2 Stainless Steel
In stockThis M6 hex flange nylon insert lock nut is manufactured to DIN 6926 in A2 stainless steel (304 grade). DIN 6926 specifies a flanged hexagon nut with a nylon collar set into the top face, combining...RRP From £2.51RRP From £2.51 -
M6 Hexagon Flange Nut DIN 6923 Non-Serrated Flange A4 Stainless Steel
In stockThis M6 hex flange nut is manufactured to DIN 6923 in A4 stainless steel (316 grade). DIN 6923 specifies a hexagon nut with an integral flange on the bearing face, spreading the clamping load without a...RRP From £13.99RRP From £13.99 -
M6 Hexagon Cap Nut DIN 917 A4 Stainless Steel
In stockThis M6 hexagon cap nut is manufactured to DIN 917 in A4 stainless steel (316 grade). DIN 917 specifies a hexagon nut closed by a domed cap, for covering an exposed thread end. The closed dome...RRP From £6.82RRP From £6.82 -
M6 Hexagon Cap Nut DIN 917 A2 Stainless Steel
In stockThis M6 hexagon cap nut is manufactured to DIN 917 in A2 stainless steel (304 grade). DIN 917 specifies a hexagon nut closed by a domed cap, for covering an exposed thread end. The closed dome...RRP From £2.12RRP From £2.12 -
M6 Hex Flange Nylon Insert Nut DIN 6926 Non-Serrated Flange A2 Stainless Steel
In stockThis M6 hex flange nylon insert lock nut is manufactured to DIN 6926 in A2 stainless steel (304 grade). DIN 6926 specifies a flanged hexagon nut with a nylon collar set into the top face, combining...RRP From £5.20RRP From £5.20 -
M6 Hex Castle Nut DIN 935 A4 Stainless Steel
In stockThis M6 castle nut is manufactured to DIN 935 in A4 stainless steel (316 grade). DIN 935 specifies a hexagon nut with slots cut across the top face, for locking with a split pin through a...RRP From £9.31RRP From £9.31
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.