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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M7 Hexagon Full Nut DIN 934 A4 Stainless Steel
In stockThis M7 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 £16.29RRP From £16.29 -
M6 X 25 Round Connector Nut A2 Stainless Steel
In stockThis M6 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 £5.51RRP From £5.51 -
M7 Hexagon Full Nut DIN 934 A2 Stainless Steel
In stockThis M7 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 £5.88RRP From £5.88 -
M6 X 9 Drive-In Nut / T-Nut A2 Stainless Steel
In stockThis M6 x 9mm 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 £3.03RRP From £3.03 -
M60 Hexagon Full Nut DIN 934 A4 Stainless Steel
In stockThis M60 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 £106.45RRP From £106.45 -
M6 X 25 Hex Rod Connector Nut DIN 6334 A2 Stainless Steel
In stockThis M6 x 25mm 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 £6.16RRP From £6.16 -
M6 X 18 Hex Rod Connector Nut DIN 6334 A4 Stainless Steel
In stockThis M6 x 18mm 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 £7.86RRP From £7.86 -
M6 X 20 Round Connector Nut A2 Stainless Steel
In stockThis M6 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 £3.87RRP From £3.87 -
M6 X 30 Hex Rod Connector Nut DIN 6334 A2 Stainless Steel
In stockThis M6 x 30mm 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 £6.49RRP From £6.49 -
M6 Vandal Proof Shear Nut A2 Stainless Steel
In stockThis M6 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 £3.90RRP From £3.90 -
M6 X 18 Hex Rod Connector Nut DIN 6334 A2 Stainless Steel
In stockThis M6 x 18mm 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 £2.94RRP From £2.94 -
M6 X 15 Slot Raised Countersunk Sleeve Nut AISI 303 Stainless Steel
In stockThis M6 x 15mm 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 £16.20RRP From £16.20 -
M6 Square Weld Nut DIN 928 A4 Stainless Steel
In stockThis M6 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. Property...RRP From £5.62RRP From £5.62 -
M6 Stiffinox Nut A2 Stainless Steel
In stockThis M6 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 £4.45RRP From £4.45 -
M6 Square Nut, Thin Type DIN 562 A2 Stainless Steel
In stockThis M6 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 £5.71RRP From £5.71 -
M6 Square Weld Nut DIN 928 A2 Stainless Steel
In stockThis M6 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 £2.48RRP From £2.48 -
M6 Short Spring Channel Nut A4 Stainless Steel
In stockThis M6 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 -
M6 Square Nut DIN 557 A2 Stainless Steel
In stockThis M6 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 £4.37RRP From £4.37 -
M6 Square Nut, Thin Type DIN 562 A4 Stainless Steel
In stockThis M6 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 £7.87RRP From £7.87 -
M6 Square Nut DIN 557 A4 Stainless Steel
In stockThis M6 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 £7.81RRP From £7.81 -
M6 Shear Nut A4 Stainless Steel
In stockThis M6 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 £18.02RRP From £18.02 -
M6 Prevailing Torque Nut A4 Stainless Steel
In stockThis M6 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 £6.48RRP From £6.48 -
M6 Prevailing Torque Nut A2 Stainless Steel
In stockThis M6 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 £6.12RRP From £6.12 -
M6 Long Spring Channel Nut A4 Stainless Steel
Out of stockThis M6 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 £14.70RRP From £14.70 -
M6 Nylon Insert Nut (Type P) DIN 982 A2 Stainless Steel
In stockThis M6 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 £2.40RRP From £2.40
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.