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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M4 Hexagon Flange Nut DIN 6923 A4 Stainless Steel
In stockThis M4 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 £7.50RRP From £7.50 -
M4 Hexagon Flange Nut DIN 6923 Non-Serrated Flange A2 Stainless Steel
In stockThis M4 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 £6.76RRP From £6.76 -
M4 Hexagon Cap Nut DIN 917 A4 Stainless Steel
In stockThis M4 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 £5.64RRP From £5.64 -
M4 Hexagon Cap Nut DIN 917 A2 Stainless Steel
In stockThis M4 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 £2.97RRP From £2.97 -
M4 Hex Flange Nylon Insert Nut DIN 6926 Non-Serrated Flange A2 Stainless Steel
In stockThis M4 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 £8.03RRP From £8.03 -
M4 Hex Flange Nylon Insert Nut DIN 6926 Serrated Flange A2 Stainless Steel
In stockThis M4 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 £5.71RRP From £5.71 -
M4 Domed Nylon Insert Nut DIN 986 A2 Stainless Steel
In stockThis M4 nylon insert lock nut is manufactured to DIN 986 in A2 stainless steel (304 grade). DIN 986 specifies a hexagon nut with a nylon collar set into the top face, for joints subject to...RRP From £6.34RRP From £6.34 -
M4 Dome Nut DIN 1587 A4 Stainless Steel
In stockThis M4 dome nut is manufactured to DIN 1587 in A4 stainless steel (316 grade). DIN 1587 specifies a hexagon nut closed with a domed cap, covering the bolt thread for safety and appearance. Property class...RRP From £6.79RRP From £6.79 -
M4 Dome Nut DIN 1587 A2 Stainless Steel
In stockThis M4 dome nut is manufactured to DIN 1587 in A2 stainless steel (304 grade). DIN 1587 specifies a hexagon nut closed with a domed cap, covering the bolt thread for safety and appearance. Property class...RRP From £2.58RRP From £2.58 -
M39 Hexagon Thin Nut DIN 439-B A2 Stainless Steel
In stockThis M39 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 £18.73RRP From £18.73 -
M39 Hexagon Full Nut DIN 934 A4-70 A4 Stainless Steel
In stockThis M39 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 £24.93RRP From £24.93 -
M39 Hexagon Full Nut DIN 934 A4-80 A4 Stainless Steel
Out of stockThis M39 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 A4-80 indicates...RRP From £22.85RRP From £22.85 -
M36 Nylon Insert Nut DIN 985 A4-80 A4 Stainless Steel
In stockThis M36 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 £55.26RRP From £55.26 -
M36 X 3 Hexagon Full Nut DIN 934 A2 Stainless Steel
In stockThis M36 x 3mm 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 £30.66RRP From £30.66 -
M39 Hexagon Full Nut DIN 934 A2 Stainless Steel
In stockThis M39 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 £9.29RRP From £9.29 -
M36 Hexagon Thin Nut DIN 439-B A4 Stainless Steel
In stockThis M36 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 £21.91RRP From £21.91 -
M36 Nylon Insert Nut DIN 985 A4-50 A4 Stainless Steel
In stockThis M36 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 £11.56RRP From £11.56 -
M36 Nylon Insert Nut DIN 985 A2 Stainless Steel
In stockThis M36 nylon insert lock nut is manufactured to DIN 985 in A2 stainless steel (304 grade). DIN 985 specifies a hexagon nut with a nylon collar set into the top face, for joints subject to...RRP From £25.47RRP From £25.47 -
M36 Hexagon Full Nut DIN 934 A4-80 A4 Stainless Steel
In stockThis M36 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 A4-80 indicates...RRP From £15.91RRP From £15.91 -
M36 Hexagon Thin Nut DIN 439-B A2 Stainless Steel
In stockThis M36 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 £25.10RRP From £25.10 -
M36 Hexagon Full Nut DIN 934 A4-70 A4 Stainless Steel
In stockThis M36 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 £13.97RRP From £13.97 -
M36 Hexagon Full Nut DIN 934 A2 Stainless Steel
In stockThis M36 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 £11.12RRP From £11.12 -
M36 Hex Castle Nut DIN 935 A2 Stainless Steel
In stockThis M36 castle nut is manufactured to DIN 935 in A2 stainless steel (304 grade). DIN 935 specifies a hexagon nut with slots cut across the top face, for locking with a split pin through a...RRP From £21.58RRP From £21.58 -
M33 X 1.5 Hexagon Thin Nut DIN 439-B A2 Stainless Steel
In stockThis M33 x 1.5mm 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...RRP From £18.41RRP From £18.41 -
M36 Dome Nut DIN 1587 A4 Stainless Steel
In stockThis M36 dome nut is manufactured to DIN 1587 in A4 stainless steel (316 grade). DIN 1587 specifies a hexagon nut closed with a domed cap, covering the bolt thread for safety and appearance. Property class...RRP From £42.63RRP From £42.63
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.