Special Offers
-
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
-
M8 Nylon Insert Nut DIN 985 A2 Stainless Steel
In stockM8 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 £3.23RRP From £3.23 -
M10 Hexagon Full Nut DIN 934 A2 Stainless Steel
In stockM10 hex nut in A2 stainless steel to DIN 934. Full-height hexagon form, compatible with all M10 bolts, machine screws, and threaded rod to metric coarse pitch. Suitable for general indoor and outdoor assemblies, electronics, and...RRP From £3.99RRP From £3.99 -
M6 Hexagon Full Nut DIN 934 A2 Stainless Steel
In stockM6 hex nut in A2 stainless steel to DIN 934. Full-height hexagon form, compatible with all M6 bolts, machine screws, and threaded rod to metric coarse pitch. Suitable for general indoor and outdoor assemblies, electronics, and...RRP From £2.69RRP From £2.69 -
M6 Dome Nut DIN 1587 A4 Stainless Steel
In stockM6 dome nut in A4 stainless steel to DIN 1587. The domed cap covers the exposed end of a bolt thread for a safe, finished appearance - used on outdoor furniture, signage, architectural fixings, and play...RRP From £3.06RRP From £3.06 -
Nylon Insert Nut DIN 985 A4-80 A4 Stainless Steel (M12)
In stockM12 nyloc nut in A4 marine 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 £5.20RRP From £5.20 -
M10 Nylon Insert Nut DIN 985 A4-80 A4 Stainless Steel
In stockM10 nyloc nut in A4 marine 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 £4.16RRP From £4.16 -
M10 Hexagon Full Nut DIN 934 A4-80 A4 Stainless Steel
In stockM10 hex nut in A4 marine grade stainless steel to DIN 934. Full-height hexagon form, compatible with all M10 bolts, machine screws, and threaded rod to metric coarse pitch. Suitable for general indoor and outdoor assemblies,...RRP From £4.26RRP From £4.26 -
M6 Hexagon Full Nut DIN 934 A4-80 A4 Stainless Steel
In stockM6 hex nut in A4 marine grade stainless steel to DIN 934. Full-height hexagon form, compatible with all M6 bolts, machine screws, and threaded rod to metric coarse pitch. Suitable for general indoor and outdoor assemblies,...RRP From £3.91RRP From £3.91 -
M4 Hexagon Full Nut DIN 934 A4 Stainless Steel
In stockM4 hex nut in A4 marine grade 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,...RRP From £6.92RRP From £6.92 -
M6 Nylon Insert Nut DIN 985 A2 Stainless Steel
In stockM6 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 £2.87RRP From £2.87 -
M3 Nylon Insert Nut DIN 985 A2 Stainless Steel
In stockM3 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 £3.00RRP From £3.00 -
M8 X 0.75 Hexagon Thin Nut DIN 439-B A4 Stainless Steel
In stockThis M8 x 0.75mm 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...RRP From £6.89RRP From £6.89 -
M8 Long Spring Channel Nut A4 Stainless Steel
In stockThis M8 long spring channel nut is manufactured in A4 stainless steel (316 grade). The long spring keeps the nut pressed against the channel lips at the chosen depth, so it stays put while the bolt...RRP From £15.81RRP From £15.81 -
M8 Hexagon Collar Nut DIN 6331 A2 Stainless Steel
In stockThis M8 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 £10.73RRP From £10.73 -
M8 Dome Nut DIN 1587 A2 Stainless Steel
In stockThis M8 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 £2.59RRP From £2.59 -
M6 Nylon Insert Nut (Type P) DIN 982 A4 Stainless Steel
In stockThis M6 high type nylon insert lock nut is manufactured to DIN 982 in A4 stainless steel (316 grade). DIN 982 specifies an increased height hexagon nut with a nylon collar in the top face, combining...RRP From £8.40RRP From £8.40 -
M5 Dome Nut DIN 1587 A2 Stainless Steel
In stockThis M5 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 £2.45RRP From £2.45 -
M4 Self-Locking Counter Nut DIN 7967 A2 Stainless Steel
In stockThis M4 self-locking counter nut is manufactured to DIN 7967 in A2 stainless steel (304 grade). DIN 7967 specifies a thin sprung ring that bites the thread as it is tightened, for locking a nut already...RRP From £5.62RRP From £5.62 -
M20 Self-Locking Counter Nut DIN 7967 A2 Stainless Steel
In stockThis M20 self-locking counter nut is manufactured to DIN 7967 in A2 stainless steel (304 grade). DIN 7967 specifies a thin sprung ring that bites the thread as it is tightened, for locking a nut already...RRP From £20.37RRP From £20.37 -
M12 X 1.5 Hexagon Full Nut DIN 934 A4 Stainless Steel
In stockThis M12 x 1.5mm 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...RRP From £27.64RRP From £27.64 -
M10 Stiffinox Nut A2 Stainless Steel
In stockThis M10 all-metal self-locking nut is manufactured in A2 stainless steel (304 grade). The locking action comes from the metal thread itself, so the nut holds where heat would soften or destroy a nylon insert.Typical applications...RRP From £14.36RRP From £14.36 -
M10 Square Nut DIN 557 A2 Stainless Steel
In stockThis M10 square nut is manufactured to DIN 557 in A2 stainless steel (304 grade). DIN 557 specifies four flats instead of six, for holding in a slot or channel where a hexagon would turn. The...RRP From £6.63RRP From £6.63 -
M10 Hexagon Thin Nut DIN 439-B A2 Stainless Steel
In stockThis M10 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 £3.13RRP From £3.13 -
5/8" UNC Dome Nut DIN 1587 A2 Stainless Steel
In stockThis 5/8" UNC 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...RRP From £16.37RRP From £16.37 -
5/16" UNF Hexagon Full Nut A2 Stainless Steel
In stockThis 5/16" UNF 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 £7.99RRP From £7.99
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.