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 Square Weld Nut DIN 928 A4 Stainless Steel
In stockThis M8 square weld nut is manufactured to DIN 928 in A4 stainless steel (316 grade). DIN 928 specifies a square body with projections for resistance welding, for building a captive thread into a fabrication. The...RRP From £6.61RRP From £6.61 -
M8 Square Weld Nut DIN 928 A2 Stainless Steel
In stockThis M8 square weld nut is manufactured to DIN 928 in A2 stainless steel (304 grade). DIN 928 specifies a square body with projections for resistance welding, for building a captive thread into a fabrication. The...RRP From £4.12RRP From £4.12 -
M8 Square Nut DIN 557 A4 Stainless Steel
In stockThis M8 square nut is manufactured to DIN 557 in A4 stainless steel (316 grade). DIN 557 specifies four flats instead of six, for holding in a slot or channel where a hexagon would turn. The...RRP From £4.27RRP From £4.27 -
M8 Square Nut, Thin Type DIN 562 A2 Stainless Steel
In stockThis M8 thin square nut is manufactured to DIN 562 in A2 stainless steel (304 grade). DIN 562 specifies four flats in a reduced height, for slots and recesses with little clearance. The reduced height fits...RRP From £5.97RRP From £5.97 -
M8 Shear Nut A2 Stainless Steel
Out of stockThis M8 shear nut is manufactured in A2 stainless steel (304 grade). Tightening snaps off the driving cone at a preset torque, leaving nothing for a spanner to grip and a smooth head behind.Typical applications Security...RRP From £4.65RRP From £4.65 -
M8 Short Spring Channel Nut A4 Stainless Steel
In stockThis M8 short spring channel nut is manufactured in A4 stainless steel (316 grade). The short spring holds the nut to the channel lips without fouling the back of a shallow section.Typical applications Shallow strut and...RRP From £7.98RRP From £7.98 -
M8 Shear Nut A4 Stainless Steel
In stockThis M8 shear nut is manufactured in A4 stainless steel (316 grade). Tightening snaps off the driving cone at a preset torque, leaving nothing for a spanner to grip and a smooth head behind.Typical applications Security...RRP From £19.79RRP From £19.79 -
M8 Prevailing Torque Nut A4 Stainless Steel
In stockThis M8 all-metal prevailing torque lock nut is manufactured in A4 stainless steel (316 grade). A distorted section of the thread grips the bolt as the nut is run on, resisting loosening by friction alone. With...RRP From £17.30RRP From £17.30 -
M8 Square Nut DIN 557 A2 Stainless Steel
In stockThis M8 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 £4.35RRP From £4.35 -
M8 Self-Locking Counter Nut DIN 7967 A2 Stainless Steel
In stockThis M8 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 £6.12RRP From £6.12 -
M8 Nylon Insert Nut DIN 985 A4-80 A4 Stainless Steel
Out of stockThis M8 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 £10.22RRP From £10.22 -
M8 Prevailing Torque Nut A2 Stainless Steel
In stockThis M8 all-metal prevailing torque lock nut is manufactured in A2 stainless steel (304 grade). A distorted section of the thread grips the bolt as the nut is run on, resisting loosening by friction alone. With...RRP From £7.44RRP From £7.44 -
M8 Hexagon Weld Nut DIN 929 A4 Stainless Steel
In stockThis M8 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 £4.78RRP From £4.78 -
M8 Nylon Insert Nut (Type P) DIN 982 A2 Stainless Steel
In stockThis M8 high type nylon insert lock nut is manufactured to DIN 982 in A2 stainless steel (304 grade). DIN 982 specifies an increased height hexagon nut with a nylon collar in the top face, combining...RRP From £2.65RRP From £2.65 -
M8 Nylon Insert Nut (White Nylon) DIN 985 A2 Stainless Steel
In stockThis M8 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 £6.88RRP From £6.88 -
M8 Hexagon Thin Nut ISO 4035-B A4 Stainless Steel
In stockThis M8 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 £14.44RRP From £14.44 -
M8 Nylon Insert Nut (Type P) DIN 982 A4 Stainless Steel
In stockThis M8 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 £5.39RRP From £5.39 -
M8 Hexagon Thin Nut DIN 439-B A2 Stainless Steel
In stockThis M8 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 £4.47RRP From £4.47 -
M8 Hexagon Thin Nut DIN 439-B A4 Stainless Steel
In stockThis M8 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 £7.79RRP From £7.79 -
M8 Hexagon Nut , Type B DIN 6330 A2 Stainless Steel
Out of stockThis M8 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 £6.93RRP From £6.93 -
M8 Hexagon Nut , Type B DIN 6330 A4 Stainless Steel
In stockThis M8 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 £16.23RRP From £16.23 -
M8 Hexagon Weld Nut DIN 929 A2 Stainless Steel
In stockThis M8 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 £3.08RRP From £3.08 -
M8 Hexagon Thin Nut ISO 4035-B A2 Stainless Steel
In stockThis M8 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 £5.91RRP From £5.91 -
M8 Hexagon Thin Nut DIN 439-B Left Hand Thread A2 Stainless Steel
In stockThis M8 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 £5.83RRP From £5.83 -
M8 Hexagon Full Nut ISO 4032 A4-80 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 A4-80 indicates...RRP From £15.35RRP From £15.35
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.