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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M8 Hexagon Full Nut ISO 4032 A2 Stainless Steel
In stockThis M8 hexagon full nut is manufactured to ISO 4032 in A2 stainless steel (304 grade). ISO 4032 specifies a standard height hexagon nut, for use with matching bolts, screws, and studding. Property class A2-70 indicates...RRP From £6.25RRP From £6.25 -
M8 Hexagon Full Nut DIN 934 Left Hand Thread A2 Stainless Steel
In stockThis M8 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 £6.25RRP From £6.25 -
M8 Hexagon Full Nut DIN 934 A2-80 A2 Stainless Steel
In stockThis M8 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 £4.94RRP From £4.94 -
M8 Hexagon Full Nut DIN 934 Left Hand Thread A4 Stainless Steel
In stockThis M8 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 £15.71RRP From £15.71 -
M8 Hexagon Full Nut ISO 4032 A4-70 A4 Stainless Steel
In stockThis M8 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 A4-70 indicates...RRP From £16.03RRP From £16.03 -
M8 Hexagon Full Nut DIN 934 Duplex Stainless Steel
In stockThis M8 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 £7.71RRP From £7.71 -
M8 Hexagon Flange Nut DIN 6923 Non-Serrated Flange A2 Stainless Steel
In stockThis M8 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 £3.10RRP From £3.10 -
M8 Hexagon Flange Nut DIN 6923 Serrated Flange A4 Stainless Steel
In stockThis M8 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 £5.54RRP From £5.54 -
M8 Hexagon Flange Nut DIN 6923 Non-Serrated Flange A4 Stainless Steel
In stockThis M8 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 £18.50RRP From £18.50 -
M8 Hex Flange Nylon Insert Nut DIN 6926 Non-Serrated Flange A2 Stainless Steel
In stockThis M8 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 £6.69RRP From £6.69 -
M8 Hexagon Flange Nut DIN 6923 Serrated Flange A2 Stainless Steel
In stockThis M8 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 £3.39RRP From £3.39 -
M8 Hex Castle Nut DIN 935 A4 Stainless Steel
In stockThis M8 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 £11.57RRP From £11.57 -
M8 Hexagon Cap Nut DIN 917 A4 Stainless Steel
In stockThis M8 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 £10.28RRP From £10.28 -
M8 Hex Flange Nylon Insert Nut DIN 6926 Serrated Flange A2 Stainless Steel
In stockThis M8 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 £4.45RRP From £4.45 -
M8 Hexagon Cap Nut DIN 917 A2 Stainless Steel
In stockThis M8 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 £5.04RRP From £5.04 -
M8 Hex Flange Nylon Insert Nut DIN 6926 A4 Stainless Steel
Out of stockThis M8 hex flange nylon insert lock nut is manufactured to DIN 6926 in A4 stainless steel (316 grade). DIN 6926 specifies a flanged hexagon nut with a nylon collar set into the top face, combining...RRP From £4.02RRP From £4.02 -
M8 Domed Nylon Insert Nut DIN 986 A2 Stainless Steel
In stockThis M8 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 £6.09RRP From £6.09 -
M8 Cast Eye Nut CE A2 Stainless Steel
In stockThis M8 eye nut is manufactured in A2 stainless steel (304 grade). The closed eye gives a permanent attachment point for rope, wire, shackles, or springs, with the internal thread fitting a matching bolt or stud....RRP From £3.27RRP From £3.27 -
M8 Hex Castle Nut DIN 935 A2 Stainless Steel
In stockThis M8 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 £5.12RRP From £5.12 -
M8 Cage Nut for 1.8-3.2mm Panels A2 Stainless Steel
In stockThis M8 cage nut is manufactured in A2 stainless steel (304 grade). The cage clips into a square hole and holds the nut captive while allowing slight float, so the thread can be lined up with...RRP From £5.34RRP From £5.34 -
M64 Hexagon Full Nut DIN 934 A4 Stainless Steel
In stockThis M64 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. The full height gives...RRP From £128.68RRP From £128.68 -
M8 Channel Nut (No Spring) A4 Stainless Steel
Out of stockThis M8 channel nut without spring is manufactured in A4 stainless steel (316 grade). The nut is dropped in and given a quarter turn so its grooves engage the channel lips, locking as the bolt is...RRP From £8.93RRP From £8.93 -
M8 Cast Eye Nut CE A4 Stainless Steel
Out of stockThis M8 eye nut is manufactured in A4 stainless steel (316 grade). The closed eye gives a permanent attachment point for rope, wire, shackles, or springs, with the internal thread fitting a matching bolt or stud....RRP From £4.06RRP From £4.06 -
M8 Cage Nut for 1.0-1.7mm Panels A2 Stainless Steel
In stockThis M8 cage nut is manufactured in A2 stainless steel (304 grade). The cage clips into a square hole and holds the nut captive while allowing slight float, so the thread can be lined up with...RRP From £6.49RRP From £6.49 -
M6 X 30 Round Connector Nut A2 Stainless Steel
In stockThis M6 x 30mm hex connector nut is manufactured in A2 stainless steel (304 grade). The extra length engages far more thread than a standard nut, letting two threaded rods be coupled end to end at...RRP From £6.00RRP From £6.00
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.