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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1/4" UNF American Wing Nut ASME B18.6.9 A2 Stainless Steel
In stockThis 1/4" UNF wing nut is manufactured to ASME B18.6.9 in A2 stainless steel (304 grade). ASME B18.6.9 specifies a nut with two projecting wings in place of hexagon flats, for hand tightening without a spanner....RRP From £6.15RRP From £6.15 -
1/2" UNF American Wing Nut ASME B18.6.9 A2 Stainless Steel
In stockThis 1/2" UNF wing nut is manufactured to ASME B18.6.9 in A2 stainless steel (304 grade). ASME B18.6.9 specifies a nut with two projecting wings in place of hexagon flats, for hand tightening without a spanner....RRP From £18.67RRP From £18.67 -
3/4" BSW American Wing Nut ASME B18.6.9 A2 Stainless Steel
Out of stockThis 3/4" BSW wing nut is manufactured in A2 stainless steel (304 grade). The wings allow the nut to be run on and released by hand, suiting assemblies that are dismantled often or where a spanner...RRP From £15.65RRP From £15.65 -
1/4" UNC American Wing Nut ASME B18.6.9 A2 Stainless Steel
In stockThis 1/4" UNC wing nut is manufactured to ASME B18.6.9 in A2 stainless steel (304 grade). ASME B18.6.9 specifies a nut with two projecting wings in place of hexagon flats, for hand tightening without a spanner....RRP From £6.02RRP From £6.02 -
1/2" UNC American Wing Nut ASME B18.6.9 A2 Stainless Steel
In stockThis 1/2" UNC wing nut is manufactured to ASME B18.6.9 in A2 stainless steel (304 grade). ASME B18.6.9 specifies a nut with two projecting wings in place of hexagon flats, for hand tightening without a spanner....RRP From £15.65RRP From £15.65 -
1" BSW American Wing Nut ASME B18.6.9 A2 Stainless Steel
In stockThis 1" BSW wing nut is manufactured in A2 stainless steel (304 grade). The wings allow the nut to be run on and released by hand, suiting assemblies that are dismantled often or where a spanner...RRP From £19.80RRP From £19.80 -
M8 X 40 Round Connector Nut A2 Stainless Steel
In stockThis M8 x 40mm 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 £7.67RRP From £7.67 -
M8 X 35 Round Connector Nut A2 Stainless Steel
In stockThis M8 x 35mm 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 £6.93RRP From £6.93 -
M8 X 50 Round Connector Nut A2 Stainless Steel
In stockThis M8 x 50mm 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 £6.64RRP From £6.64 -
M8 X 30 Round Connector Nut A2 Stainless Steel
In stockThis M8 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 £7.04RRP From £7.04 -
M8 X 20 Slot Raised Countersunk Sleeve Nut AISI 303 Stainless Steel
In stockThis M8 x 20mm slotted raised countersunk sleeve nut is manufactured in stainless steel. The barrel takes a screw from the opposite side while the raised head gives a finished, slightly domed face on show.Typical applications...RRP From £24.88RRP From £24.88 -
M8 X 24 Hex Rod Connector Nut DIN 6334 A4 Stainless Steel
In stockThis M8 x 24mm hex connector nut is manufactured to DIN 6334 in A4 stainless steel (316 grade). DIN 6334 specifies an extended length hexagon nut, roughly three times standard height, for joining two lengths of...RRP From £4.60RRP From £4.60 -
M8 X 24 Hex Rod Connector Nut DIN 6334 A2 Stainless Steel
Out of stockThis M8 x 24mm hex connector nut is manufactured to DIN 6334 in A2 stainless steel (304 grade). DIN 6334 specifies an extended length hexagon nut, roughly three times standard height, for joining two lengths of...RRP From £2.77RRP From £2.77 -
M8 X 25 Round Connector Nut A2 Stainless Steel
In stockThis M8 x 25mm 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 £6.09RRP From £6.09 -
M8 X 11 Drive-In Nut / T-Nut A2 Stainless Steel
In stockThis M8 x 11mm drive-in T-nut is manufactured in A2 stainless steel (304 grade). The prongs are hammered into the timber and lock the nut as the bolt is tightened, giving a metal thread in a...RRP From £3.34RRP From £3.34 -
M8 X 20 Round Connector Nut A2 Stainless Steel
In stockThis M8 x 20mm 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 £5.50RRP From £5.50 -
M8 X 1 Hexagon Thin Nut DIN 439-B A4 Stainless Steel
In stockThis M8 x 1mm 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 £13.03RRP From £13.03 -
M8 X 1 Hexagon Thin Nut DIN 439-B A2 Stainless Steel
In stockThis M8 x 1mm 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 £5.86RRP From £5.86 -
M8 X 0.75 Hexagon Thin Nut DIN 439-B A2 Stainless Steel
Out of stockThis M8 x 0.75mm 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 £2.90RRP From £2.90 -
M8 X 1 Nylon Insert Nut DIN 985 A2 Stainless Steel
In stockThis M8 x 1mm 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...RRP From £7.96RRP From £7.96 -
M8 X 1 Hexagon Full Nut DIN 934 A2 Stainless Steel
In stockThis M8 x 1mm 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 £6.54RRP From £6.54 -
M8 X 1 Hexagon Full Nut DIN 934 A4 Stainless Steel
In stockThis M8 x 1mm 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 £15.87RRP From £15.87 -
M8 Square Nut, Thin Type DIN 562 A4 Stainless Steel
In stockThis M8 thin square nut is manufactured to DIN 562 in A4 stainless steel (316 grade). DIN 562 specifies four flats in a reduced height, for slots and recesses with little clearance. The reduced height fits...RRP From £17.04RRP From £17.04 -
M8 X 0.75 Hexagon Full Nut DIN 934 A2 Stainless Steel
In stockThis M8 x 0.75mm 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 £5.98RRP From £5.98 -
M8 Stiffinox Nut A2 Stainless Steel
In stockThis M8 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 £8.95RRP From £8.95
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.