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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M6 Hex Castle Nut DIN 935 A4 Stainless Steel
In stockThis M6 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 £9.31RRP From £9.31 -
M6 Hex Flange Nylon Insert Nut DIN 6926 A4 Stainless Steel
In stockThis M6 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 £17.69RRP From £17.69 -
M6 Hex Castle Nut DIN 935 A2 Stainless Steel
In stockThis M6 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 £5.55RRP From £5.55 -
M6 Dome Nut DIN 1587 A2 Stainless Steel
In stockThis M6 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 £2.17RRP From £2.17 -
M6 Channel Nut (No Spring) A4 Stainless Steel
In stockThis M6 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 £12.54RRP From £12.54 -
M6 Domed Nylon Insert Nut DIN 986 A2 Stainless Steel
In stockThis M6 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 £4.15RRP From £4.15 -
M6 Cast Eye Nut CE A4 Stainless Steel
Out of stockThis M6 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 £5.46RRP From £5.46 -
M6 Cast Eye Nut CE A2 Stainless Steel
In stockThis M6 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 £3.19RRP From £3.19 -
M56 Hexagon Full Nut DIN 934 A4 Stainless Steel
In stockThis M56 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 £72.18RRP From £72.18 -
M52 Hexagon Full Nut DIN 934 A4 Stainless Steel
In stockThis M52 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 £26.18RRP From £26.18 -
M6 Cage Nut A2 Stainless Steel
In stockThis M6 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 £3.25RRP From £3.25 -
M5 X 15 Hex Rod Connector Nut DIN 6334 A4 Stainless Steel
In stockThis M5 x 15mm 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 £7.36RRP From £7.36 -
M52 Hexagon Full Nut DIN 934 A2 Stainless Steel
In stockThis M52 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 A2-50 indicates...RRP From £16.09RRP From £16.09 -
M5 Square Weld Nut DIN 928 A2 Stainless Steel
In stockThis M5 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 £3.62RRP From £3.62 -
M5 Square Nut, Thin Type DIN 562 A2 Stainless Steel
In stockThis M5 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 £4.97RRP From £4.97 -
M5 X 15 Slot Raised Countersunk Sleeve Nut AISI 303 Stainless Steel
In stockThis M5 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 £15.62RRP From £15.62 -
M5 X 8 Drive-In Nut / T-Nut A2 Stainless Steel
In stockThis M5 x 8mm 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 £3.38RRP From £3.38 -
M5 Stiffinox Nut A2 Stainless Steel
In stockThis M5 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 £12.03RRP From £12.03 -
M5 Prevailing Torque Nut A4 Stainless Steel
In stockThis M5 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 £7.24RRP From £7.24 -
M5 X 15 Hex Rod Connector Nut DIN 6334 A2 Stainless Steel
In stockThis M5 x 15mm 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 £2.63RRP From £2.63 -
M5 Self-Locking Counter Nut DIN 7967 A2 Stainless Steel
In stockThis M5 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 £4.63RRP From £4.63 -
M5 Square Nut DIN 557 A4 Stainless Steel
In stockThis M5 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 £3.13RRP From £3.13 -
M5 Nylon Insert Nut (White Nylon) DIN 985 A2 Stainless Steel
In stockThis M5 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 £5.86RRP From £5.86 -
M5 Square Nut DIN 557 A2 Stainless Steel
In stockThis M5 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 £5.07RRP From £5.07 -
M5 Nylon Insert Nut (Type P) DIN 982 A4 Stainless Steel
In stockThis M5 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 £10.71RRP From £10.71
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.