EKINSUN is a custom parts manufacturer that makes the fasteners this chart cannot buy: the size past the end of the range, the odd pitch, the height that fits the pocket, the material the catalogue does not carry. Everything inside the ranges below is a standard size: a distributor is the quicker buy, and we also make it to order from 1 piece. The chart tells the two apart in a minute instead of an afternoon of catalogue pages, and the specialist page for each family is one click away.
A typical situation: the buyer knows what the part is called in their own language but not which standard it belongs to, and the supplier keeps asking for a DIN number.
That is the gap the chart fills. The ranges are what a distributor stocked in 2026 in stainless 201 / 304 / 316 / 410, carbon steel in classes 4.8 to 12.9, brass, nylon, PEEK, aluminium and titanium; where a family exists in several materials the row lists each range.
How to read the chart
Four columns matter. Standard is the number to put on a purchase order; where two are listed the ISO number is current and the DIN number is what most catalogues still print. Size range is the span a distributor holds in that family: a size inside it is bought, not made. Made to drawing when names the single attribute that most often pushes a buyer out of the range. Page links to the family page with the full size table, the list of what is made to drawing, and the measuring routine.
- Metric sizes are the nominal thread: M6 means a 6 mm major diameter, coarse pitch unless the row says fine.
- Ranges with two numbers per material (M3–M24 stainless; M2–M16 steel) mean the family is standard in both; the smaller span is the harder one to find.
- Where the standard column says maker series, there is no DIN or ISO number and the part is defined by the maker's own catalogue; that is the family where custom work is most common.
- Inch sizes (4-40, 6-32, 8-32, 10-32, 1/4-20) appear in a few rows; the full metric-to-inch logic is on the metric vs imperial thread chart.
Nuts
Standard nuts run from M1 to M64: hex nuts ISO 4032 M1–M48, thin nuts ISO 4035 M4–M30, nyloc nuts DIN 985 M3–M24, flange nuts DIN 6923 M2.5–M20, cap nuts DIN 1587 M2–M30, wing nuts DIN 315 M3–M24, weld nuts DIN 929 M3–M12, T-slot nuts DIN 508 M3–M20, coupling nuts DIN 6334 M4–M48, bearing lock nuts DIN 981 M10–M60 and eye nuts DIN 582 up to M64.
Need a nut from this table in a size, thread or material the catalogue does not list? Any row is made to order from 1 piece, standard sizes can also be supplied from stock, quote in 12 hours, delivered DDP. Get a price on WhatsApp, Quote form
| Type | Also sold as | Standard | Size range | Made to drawing when | Page |
|---|---|---|---|---|---|
| Hex nut | full nut | ISO 4032 / DIN 934 | M1–M48 stainless; M2–M30 zinc steel; class 8 hot-dip to M36; brass M1.4–M16; titanium M3–M20 | across-flats, height or pitch not in the table; M30 and up in a special grade | large nuts |
| Thin nut | jam nut, half nut, lock nut | ISO 4035 / DIN 439 | M4–M30; fine pitch M6–M36 | a height between the two standard heights | tall & thin nuts |
| Nyloc nut | nylon-insert lock nut | DIN 985 / ISO 10511 (thin); DIN 982 / ISO 7040 (high) | M3–M24 stainless; fine pitch M8–M20; left-hand M6–M12; steel M2–M16; brass M4–M12 | left-hand above M12, a fine pitch outside that set, an insert for high temperature | flange & flange-nyloc nuts |
| All-metal lock nut | prevailing-torque nut, stover nut | DIN 980 / ISO 7042 | M3–M12; flange type M5–M12 | above M12, fine pitch | special fasteners |
| Flange nut | serrated or plain flange | DIN 6923 / ISO 4161 / EN 1661 | M2.5–M20 serrated; fine M8–M12; left-hand M8–M12; class 10.9 M6–M20; nylon M3–M12 | flange diameter or height off the table, a hardened nut, left-hand | flange nuts |
| Cap nut | acorn nut, dome nut | DIN 1587 (high); DIN 917 (low); DIN 986 (dome nyloc) | M2–M30 stainless; fine M8–M16; left-hand M6–M16; brass M3–M20; nylon M3–M20 | dome height or shape, a closed sleeve nut, a polished finish | cap nuts |
| Wing nut | butterfly nut | DIN 315 | M3–M12 pressed; M4–M24 cast; rod-wing M6–M12; nylon M3–M12 | wing span, fine pitch, stainless above M12 | wing nuts & wing screws |
| Square nut | DIN 557; thin DIN 562 | M3–M12; thin M3–M8 | a plate nut, an odd thickness | T-slot & square nuts | |
| Weld nut | projection nut, hex or square | DIN 929 (hex); DIN 928 (square) | hex M3–M12; square M3–M24 | projection pattern, pilot, stainless above M12 | weld nuts |
| Tee nut | pronged tee nut, four-prong nut | DIN 1624 | M3–M10 | prong count or flange | insert & tee nuts |
| T-slot nut | slide-in nut, hammer nut, spring-loaded nut | DIN 508 | profile M3–M8; machine-table class 10.9 M6–M20 | a slot width outside the DIN 650 series, a long T-nut | T-slot nuts |
| Cage nut | captive rack nut | 19-inch rack practice (EIA-310) | M4–M10 | an odd panel hole or panel thickness, stainless | cage nuts |
| Rivet nut | blind rivet nut, nutsert | no DIN; maker series | M3–M12 flat, countersunk and half-hex; steel, stainless, aluminium | grip range, closed end, long body | rivet nuts |
| Self-clinching nut | press nut, PEM-type | maker series | M2.5–M10; clinch standoffs M2.5–M5 | a thread or shank length the series does not list | self-clinching nuts |
| Coupling nut | long nut, extension nut | DIN 6334 | long hex M4–M48; round M12–M45 | reducing, two pitches, one body | coupling nuts, brass, by size, 304 stainless, 10–100 mm |
| Castle nut | slotted nut | DIN 935 / DIN 979 | M6–M24 | slot count or pitch | castle nuts |
| Knurled thumb nut | DIN 466 (high) / DIN 467 (flat) | M3–M12; long knurled M3–M16 | knurl, height, blind bore | knurled nuts | |
| K-lock nut | keps nut, nut with tooth washer | maker series | M3–M12 | — | special fasteners |
| Eye nut | lifting ring nut | DIN 582 | M3–M20 stainless; M6–M64 steel | a rated lift in stainless above M20 | eye bolts & eye nuts |
| Barrel nut | cross-dowel, cross-hole nut | no DIN | M4–M6 | diameter or hole position | insert nuts |
| Bearing lock nut | KM nut, slotted round nut | DIN 981 | M10–M60 | above M60, odd pitch | bearing lock nuts |
| Heat-set insert | knurled brass insert nut | maker series | M1.4–M20; 1/4 in | length, outside diameter or knurl for your boss | inserts for plastics |
Found the fastener type, but not in your size or material? EKINSUN is a custom parts manufacturer: we make that fastener to your drawing, sketch or sample, steel up to class 12.9, 304 or 316L stainless steel, brass, 6061 aluminium or titanium, from 1 piece, quoted in 12 hours and shipped duties paid. Already a catalogue size? Ask us too, we may have it in stock, and larger quantities cost less per piece. All custom fasteners
Bolts and screws
Standard bolts and screws run from M1 to M48: hex bolts ISO 4017 / 4014 M3–M36, socket head cap screws ISO 4762 M1.4–M24, machine screws ISO 7045–7047 M1–M10, self-tapping screws ISO 7049–7051 M1–M8, set screws ISO 4026–4029 M1.2–M24, shoulder screws ISO 7379 M3–M16, eye bolts DIN 580 M5–M20, threaded rod DIN 975 M3–M48 and double-end studs DIN 938 / 939 M3–M39.
Need a bolt or screw from this table in a non-catalogue length, thread or material? Any row is made to order from 1 piece, standard sizes can also be supplied from stock, quote in 12 hours, delivered DDP. Get a price on WhatsApp, Quote form
| Type | Also sold as | Standard | Size range | Made to drawing when | Page |
|---|---|---|---|---|---|
| Hex bolt | hex cap screw, set bolt | ISO 4017 / DIN 933 (full thread); ISO 4014 / DIN 931 (shank) | M3–M36 stainless; 8.8 M4–M33; 12.9 M5–M20; fine pitch M6–M16 | length between the steps, fine pitch, drilled head or shank | hex bolts |
| Hex flange bolt | DIN 6921 / EN 1665 | M5–M12 stainless; 10.9 M6–M20 (plain and serrated flange) | hardened with a special flange | hex bolts | |
| Socket head cap screw | Allen bolt | ISO 4762 / DIN 912 | M1.4–M24; 12.9 to M24; left-hand M4–M16; fine M3–M12 | socket head cap screws | |
| Low head socket screw | DIN 7984 | M3–M16 | socket head cap screws | ||
| Button head screw | ISO 7380-1; ISO 7380-2 with flange | M1.6–M20 | socket head cap screws | ||
| Countersunk socket screw | flat-head Allen | ISO 10642 / DIN 7991 | M2–M24 | socket head cap screws | |
| Machine screws | pan PM, countersunk KM, cheese, truss TM, thin CM | ISO 7045 / 7046 / 7047; ISO 1207 / 1580 / 2009 (slotted); DIN 7985 / 965 / 966 / 84 / 85 / 963 | M1–M10 | head diameter or height off the table, odd thread, a drive the line does not run | machine screws & head types |
| Torx machine screws | star drive | ISO 14583 (pan); ISO 14581 (csk); ISO 14580 (cheese) | M2–M20 | machine screws | |
| Self-tapping screws | PA, KA, TA (pointed); PB, KB (flat end); PT, KT (cutting end) | ISO 7049 / 7050 / 7051; DIN 7981 / 7982 / 7983; thread ends ISO 1478 C and F | M1–M8 (2.2–8 mm) | a point or length outside the series | self-tapping screws |
| Self-drilling screws | Tek screws, drill-point | ISO 15480 / 15481 / 15482; DIN 7504 K / N / P | 3.5–6.3 mm; 410 stainless and zinc steel; with EPDM washer | self-tapping screws | |
| Thread-forming for metal | tri-lobular, Taptite-type | DIN 7500 | M3–M6 | self-tapping screws | |
| Chipboard / drywall screws | DIN 7997; DIN 18182 | 3–8 mm; 3.5 mm | on request, from 1 piece | self-tapping screws | |
| SEMS screws | combination screws, washer-head assemblies | DIN 6900 series; ISO 10644 | M1.6–M12, two- and three-piece | a washer the series does not pair | SEMS screws |
| Captive screws | panel screws, captive panel fasteners | maker series | M2–M12 | shoulder length for your panel | captive screws |
| Security screws | pin-Torx, tri-head, one-way, snake-eye | maker series | M2–M10 | a drive no catalogue lists | security screws |
| Set screws | grub screws | ISO 4026 / 4027 / 4028 / 4029; DIN 913 / 914 / 915 / 916; DIN 551 slotted | M1.2–M24; ball, nylon and POM tips; spring plungers M3–M12 | point geometry | set screws |
| Shoulder screws | stripper bolts | ISO 7379 | M3–M16 (12.9); fitted hex bolts M12–M24 | shoulder bolts | |
| Thumb screws | knurled screws | DIN 464 / DIN 465 | M2–M10 | thumb screws | |
| Wing screws | butterfly screws | DIN 316 | M3–M16 | wing nuts & wing screws | |
| Eye bolts | lifting eye, swing bolt | DIN 580 (forged); DIN 444 (swing) | M5–M20; eye screws M4–M24 | eye bolts | |
| U-bolts | no DIN | M6–M12, square and round | U-bolts | ||
| Carriage bolts | coach bolts, cup-square | DIN 603 | M4–M12 | square head & coach bolts | |
| T-bolts / hammer-head bolts | DIN 787; DIN 186 | M5–M12; M8 | T-slot nuts & T-bolts | ||
| Threaded rod | all-thread, studding | DIN 975 / DIN 976 | M3–M48; 12.9 to M48; left-hand M12–M24; fine M8–M24 | threaded rods | |
| Double-end studs | DIN 938 / DIN 939 | M3–M39 | double-end studs | ||
| Weld studs | spot-weld screws | ISO 13918 | M2.5–M10; copper-plated steel, stainless, aluminium | weld bolts & studs | |
| Hollow and drilled bolts | banjo bolts, wired bolts | no DIN | hollow M4–M20; drilled M6–M16 | drilled head bolts | |
| Thread-locking patch screws | nylon patch, 180° and 360° | maker series | M2–M25 | machine screws |
Catalogue shorthand for heads and thread ends. Catalogue lists from Asian fastener lines label screws with two-letter codes instead of standard numbers: the first letter is the head, the second the thread end. Buyers see them on quotes and packing lists; this is what they mean.
| Code | Meaning |
|---|---|
| PM / PA / PB / PT | pan head: machine thread / pointed tapping / flat-end tapping / cutting-end tapping |
| PWM / PWA / PWB / PWT | pan head with captive washer, same four thread ends |
| KM / KA / KB / KT | countersunk head, same four thread ends |
| BM / BA / BT | large pan (bugle) head: machine / pointed / cutting end |
| TM / TA / TB / TT | truss (large flat) head: machine / pointed / flat end / cutting end |
| CM / CA / CB | thin wafer head: machine / pointed / flat end |
| FM | small countersunk, thin head, machine thread |
| OM | raised countersunk (oval) head, machine thread |
| HM / HA / HB | socket cap head: machine / pointed tapping / flat-end tapping |
| PCA / KCA | button-socket and countersunk-socket heads on tapping threads |
| A / B / BT thread ends | pointed (ISO 1478 type C), flat end (type F), cutting end (type 25) |
| 180° / 360° patch | nylon thread-locking patch covering half or the full circumference |
| 3-piece / 2-piece | SEMS with spring washer + flat washer, or one washer only |
| 4-40, 6-32, 8-32, 10-32, 1/4-20 | UNC sizes that appear next to the metric rows |
Washers
Standard washers run from M1.6 to M118: flat washers ISO 7089 M1.6–M52, shim washers DIN 988 M3–M40, spring washers DIN 127 M1.6–M36, tooth and serrated washers DIN 6797 / 6798 M2–M33, wave washers DIN 137 M3–M118, disc springs DIN 2093 M3–M40, wedge-lock pairs DIN 25201 M3–M42, tab washers M5–M60 and copper sealing rings DIN 7603 M5–M36.
Need a washer from this table in a non-catalogue size or thickness? Any row is made to order from 1 piece, standard sizes can also be supplied from stock, quote in 12 hours, delivered DDP. Get a price on WhatsApp, Quote form
| Type | Standard | Size range | Page |
|---|---|---|---|
| Flat washer | ISO 7089 / DIN 125 | M1.6–M52; large-OD DIN 9021 / ISO 7093 M3–M24; small-OD DIN 433 M2–M24 | custom washers |
| Shim washer | DIN 988 | M3–M40, ultra-thin | custom washers |
| Spring lock washer | DIN 127; DIN 7980 (socket cap) | M1.6–M36; heavy M6–M20 | washer types |
| Tooth and serrated lock washers | DIN 6797; DIN 6798 (A external, J internal, V countersunk) | M2–M33 | washer types |
| Wave washer | DIN 137 | M3–M118 | washer types |
| Disc spring | DIN 2093 | M3–M40 | washer types |
| Wedge-lock washer pair | DIN 25201 (Nord-Lock type) | M3–M42 | washer types |
| Square, taper and plate washers | DIN 436; DIN 434 / 435 (taper) | M3–M36 | washer types |
| Spherical and conical seat washers | DIN 6319 | M3–M24 | washer types |
| Tab lock washers | DIN 93; DIN 432; DIN 463 | M5–M60 | washer types |
| Sealing washers | bonded EPDM; copper rings DIN 7603 | 5.5–16 mm; M5–M36 copper | washer types |
| Cup and finishing washers | no DIN | M3–M6; anodised aluminium M2–M8 | washer types |
| Insulating washers | nylon, fibre, PTFE, PEEK, mica, ceramic | M1.4–M24; TO-220 / TO-3P pads | plastic fasteners |
Pins, keys and retaining rings
Standard pins, keys and rings run from 1 to 300 mm: dowel pins ISO 8734 / ISO 2338 1.5–30 mm, taper pins ISO 2339 3–12 mm, clevis pins ISO 2341 3–20 mm, slotted spring pins ISO 8752 1.5–16 mm, split pins ISO 1234 1–12 mm, grooved pins DIN 1470–1477 1.5–8 mm, circlips DIN 471 / 472 for 3–300 mm shafts and 8–300 mm bores, E-clips DIN 6799 1.2–15 mm and parallel keys DIN 6885 3–25 mm.
Need a pin, key or ring from this table in a size the catalogue skips? Any row is made to order from 1 piece, standard sizes can also be supplied from stock, quote in 12 hours, delivered DDP. Get a price on WhatsApp, Quote form
| Type | Standard | Size range | Page |
|---|---|---|---|
| Dowel pin | ISO 8734 / DIN 6325 (hardened); ISO 2338 / DIN 7 (soft) | 1.5–30 mm | dowel pins, size chart |
| Internally threaded dowel | ISO 8735 / DIN 7979 | M2.5–M20 | dowel pins |
| Taper pin | ISO 2339 / DIN 1; threaded DIN 7978 | 3–12 mm | taper pins |
| Clevis pin | ISO 2341 / DIN 1444 | 3–20 mm; grooved M3–M16 | clevis pins |
| Slotted spring pin | ISO 8752 / DIN 1481; light ISO 13337 | 1.5–16 mm | spring pins |
| Coiled spring pin | ISO 8750 / 8748 / 8751 | on request | spring pins |
| Split pin | ISO 1234 / DIN 94 | 1–12 mm | cotter pins |
| R-clip | DIN 11024 | 1–5 mm wire | R-clips |
| Grooved and knurled pins | DIN 1470–1477 | 1.5–8 mm | grooved pins |
| External / internal circlip | DIN 471 / DIN 472 | shaft 3–300 mm; bore 8–300 mm | retaining rings |
| E-clip | DIN 6799 | 1.2–15 mm | retaining rings |
| Round-wire snap ring | DIN 7993 | 4–140 mm | retaining rings |
| Parallel key | DIN 6885 A | 3–25 mm | machine keys, keyway chart |
| Woodruff key | DIN 6888 | 2–10 mm | machine keys |
| Steel balls | ISO 3290 | 0.5–60 mm, on request, from 1 piece | — |
Standoffs, inserts and sheet-metal fasteners
Standoffs, inserts and sheet-metal fasteners run from M1.4 to M24: hex standoffs M2–M10 up to 100 mm long, heat-set and press-in inserts for plastics M1.4–M20, self-tapping thread inserts M2–M18, wire thread inserts DIN 8140 M2–M24, rivet nuts M3–M12, self-clinching nuts M2.5–M10, weld nuts and studs M2.5–M24 and cage nuts M4–M10.
Need a standoff or insert from this table in a custom length or thread? Any row is made to order from 1 piece, standard sizes can also be supplied from stock, quote in 12 hours, delivered DDP. Get a price on WhatsApp, Quote form
| Type | Standard | Size range | Page |
|---|---|---|---|
| Hex standoff, male-female and female-female | no DIN; UNC 4-40 alongside metric | M2–M10, lengths to 100 mm; brass, 303 stainless, zinc or nickel steel, nylon | custom standoffs, rack standoffs |
| Round standoff and spacer sleeve | no DIN | M2–M8; ABS / nylon tubes 4–18 mm | custom spacers |
| PCB supports and snap-in spacers | maker series MAD, MCS, SS, RC, AS, LCF, PS | 1.6–36 mm | plastic fasteners |
| Heat-set and press-in inserts for plastics | maker series | M1.4–M20; 1/4 in; brass, stainless | inserts for plastics |
| Self-tapping thread inserts | slotted, three-hole, 302-type | M2–M18 | inserts for plastics |
| Wire thread inserts | DIN 8140 | M2–M24 | inserts for plastics |
| Rivet nuts | maker series | M3–M12 | rivet nuts |
| Self-clinching nuts, studs and standoffs | maker series | M2.5–M10 | self-clinching nuts |
| Weld nuts and weld studs | DIN 929 / 928; ISO 13918 | M3–M24; studs M2.5–M10 | weld nuts |
| Cage nuts | 19-inch rack | M4–M10 | cage nuts |
Rivets, plastic, non-ferrous and stamped hardware
Blind rivets ISO 15977–15984 run from 2.4 to 6.4 mm, solid rivets DIN 660 / 661 from 1.5 to 16 mm and semi-tubular rivets DIN 7338 from 2 to 8 mm; the non-ferrous and plastic families cover nylon, PC and PEEK fasteners M1.4–M20, brass fasteners M1.4–M20, titanium bolts M3–M20, anodised aluminium nuts M2–M8 and clamping knobs DIN 6335–6337 M3–M16.
Need one of these items in a non-standard size or material? Any row is made to order from 1 piece, standard sizes can also be supplied from stock, quote in 12 hours, delivered DDP. Get a price on WhatsApp, Quote form
| Type | Standard | Size range | Page |
|---|---|---|---|
| Blind rivets, open and closed end | ISO 15977–15984; DIN 7337 | 2.4–6.4 mm; aluminium, steel, stainless; dome and countersunk | rivets |
| Solid rivets | DIN 660 (round); DIN 661 (countersunk) | 1.5–16 mm; steel, stainless, copper, aluminium | rivets |
| Semi-tubular rivets | DIN 7338 | 2–8 mm | rivets |
| Nylon push and snap rivets | maker series R2024–R6080 | 3–19 mm | plastic fasteners |
| Nylon, PC and PEEK screws, nuts and washers | no DIN | M1.4–M20; PEEK to M10 | plastic fasteners |
| Brass screws, nuts, washers and standoffs | same DIN / ISO numbers as steel | M1.4–M20 | brass fasteners |
| Titanium bolts, nuts and washers | same DIN / ISO numbers | M3–M20 | titanium bolts |
| Anodised aluminium nuts and washers | no DIN | M2–M8, coloured | titanium & light-alloy bolts |
| Knobs, star grips and clamping levers | DIN 6336; DIN 6335; DIN 6337 | M3–M16 | clamping knobs |
| Stamped clips, clamps, terminals and deep-drawn caps | to drawing | spring steel, stainless, brass, phosphor bronze | stamped parts |
Finishes on standard fasteners
Standard steel fasteners come zinc plated for indoor use, hot-dip galvanised for outdoor structures, black oxide on 10.9 and 12.9 socket screws, phosphated on drywall screws, nickel plated on brass and chassis parts, and zinc-flake on 10.9 flange bolts and wedge-lock washers; stainless 304, 316, 201 and 410 are passivated rather than coated, and aluminium and titanium are anodised.
| Finish | Base metal | What it does | Typical standard parts |
|---|---|---|---|
| Zinc plated (white / blue, yellow, black) | steel | thin electroplated zinc with a chromate passivation; indoor and mild outdoor use; trivalent passivation on request | hex nuts M2–M30, machine screws, rods, 8.8 bolts |
| Hot-dip galvanised | steel | thick zinc for outdoor structures; nuts are tapped oversize per ISO 10684 so the pair still runs | 8.8 hex bolts M6–M33, class 8 nuts M8–M36 |
| Black oxide | steel, 10.9 / 12.9 | thin conversion layer, oiled; cosmetic and light protection | 12.9 socket screws M1.6–M24, set screws, threaded rod M5–M48 |
| Phosphate (black / grey) | steel | paint base and light protection | drywall and chipboard screws |
| Nickel plated | steel, brass | bright, hard, decorative and conductive | brass standoffs, chassis screws, K-lock nuts |
| Zinc-flake (Dacromet type) | 10.9 / 12.9 steel, spring steel | non-electrolytic coating with the longest salt-spray life in this list and no hydrogen-embrittlement step | 10.9 flange bolts M6–M20, wedge-lock washers, spring clamps |
| Passivated stainless | 304 / A2, 316 / A4, 201, 410 | no coating; the alloy itself resists corrosion | everything in the stainless series |
| Black stainless | 304 | black finish over stainless for dark assemblies | screws M2–M12, nuts M2–M30 |
| Tin, silver, gold | brass, phosphor bronze, copper | solderability and contact resistance | contact pins, terminals, solder tags |
| Anodised | aluminium, titanium | colour and a hard oxide skin | aluminium nuts and washers M2–M8 |
Where the catalogue stops
Any standard part inside the ranges above, in a standard finish, is a catalogue part; the same part one size past the range, with one dimension changed, in a fine or left-hand pitch outside the listed sets, in a material or finish the row does not list, or known only from a sample is made to drawing from 1 piece; anchors, hooks, chain, hose clamps and tools are standard hardware only.
| What you need | In the catalogue? | What we make |
|---|---|---|
| A standard part inside the ranges above, in a standard finish | Yes | Buy it from stock, or have it made to order from 1 piece. No one-off competes with the catalogue price, and we say so in the quote. Standard parts: ask us too, we may have them in stock. |
| The same part one size past the range: an M14 rivet nut, an M36 cap nut, a 4-40 cage nut | No | Made to drawing from bar or plate, from 1 piece; the family page shows what to measure. |
| A standard part with one dimension changed: length, height, across-flats, flange diameter | No | Machined to your number; the thread stays standard so the mating part is unaffected. |
| A fine pitch or left-hand thread outside the sets listed in the rows | No | Single-pointed or tapped to the pitch you measure; see the measuring routine on each family page. |
| A standard part in a material the row does not list: 316L instead of 304, brass instead of steel, titanium, 42CrMo4 | No | Same geometry, your material; certificates per batch where the drawing calls for them. |
| A standard part with a finish the row does not list | Partly | Quoted per batch with the finisher; some finishes carry minimum lots, and we say which. |
| A discontinued fastener you only have a sample of | No | Measured and reproduced; see replacement bolts from a sample and obsolete fasteners. |
| Anchors, hooks, chain, hose clamps, tools, packaging | Yes | Standard hardware only; not something we make to drawing. Buy it from a hardware distributor. |
Materials across the chart
Stainless 304 (A2-70) is the default in every family with nuts to M48, 316L (A4-80) covers marine and chemical duty, carbon steel comes in classes 4.8 to 12.9, 42CrMo4 is machined for large high-strength parts, 65Mn spring steel makes circlips and spring washers, brass CW614N makes inserts and electrical fasteners, aluminium 6061 and 7075 make standoffs and light-alloy bolts, titanium Grade 2 and Grade 5 bolts run M4–M10 as standard, and nylon 66, PC, PEEK and PTFE make insulating fasteners.
| Material | Designation | Where it fits here |
|---|---|---|
| Stainless 304 | 1.4301 / A2-70 | the default stainless in every family; nuts to M48, screws to M36 |
| Stainless 316L | 1.4404 / A4-80 | marine and chemical duty; standard in the common sizes, made to order in the rest |
| Free-machining stainless | 303 / 1.4305 | standoffs and turned inserts |
| Carbon steel | class 4.8, 8.8, 10.9, 12.9 to ISO 898-1 | bolts, socket screws, rods; finish per the table above |
| Alloy steel, quenched and tempered | 42CrMo4 / 1.7225 | custom large and high-strength parts machined from bar |
| Spring steel | 65Mn, C67S, C75S | circlips, spring washers, clips |
| Brass | CW614N (CuZn39Pb3) or C36000 for machined parts; CuZn37 for cold-headed screws | inserts, standoffs, electrical fasteners |
| Aluminium 6061 | AlMg1SiCu | standoffs, spacers, machined light-alloy parts |
| Aluminium 7075 | AlZn5.5MgCu | high-strength light-alloy bolts and machined parts |
| Titanium | Grade 2, Grade 5 Ti6Al4V | bolts M4–M10 standard; custom above |
| Nylon 66, PC, PEEK, PTFE | PA66, PC, PEEK, PTFE | insulating screws, nuts, washers, standoffs |
Operating parts with a thread, indexing plungers M10 to M20, clamping levers and levelling feet, are on indexing plungers.
Every retaining ring needs a groove of the right size; the circlip groove size chart gives it for shafts 3–100 mm and bores 8–100 mm.
Frequently asked questions
It is the span of sizes a distributor holds for that family in that material, read from a 2026 catalogue. A size inside the range is a standard size: it is quicker bought from a distributor, and we also make it to order from 1 piece; a size outside it, or a standard size with one changed dimension, is the part EKINSUN makes to drawing.
Compare three things with the row: the size against the range, the pitch against the standard pitch for that diameter, and the material against the materials listed. If all three match, it is a standard part: buy it off the shelf, or have it made to order from 1 piece. If any one does not, send the drawing or the sample; the family page lists exactly which numbers to send.
Either works on a purchase order, but the ISO number is the current one and the DIN number is what most catalogues still print. The chart lists both wherever both exist, so you can quote the number the other side expects.
The chart is there to send you to standard for standard sizes, because a catalogue part is cheaper than anything made one at a time. What EKINSUN makes is the part outside the range: the odd size, the special height, the fine or left-hand pitch, the material the catalogue does not carry.
EKINSUN is a custom parts manufacturer that makes nuts, bolts, screws, washers, pins, inserts and standoffs to drawing or from a sample, from 1 piece, in stainless 304 and 316L, carbon and alloy steel, brass, aluminium 6061 and 7075, titanium and PEEK, with a quote within 12 hours.
There is no list price, because the cost is set by material, quantity and the number of operations: a plain turned nut in 304 is a few minutes of lathe time, a hardened and coated bolt with a drilled head is several steps. The quote states each driver, and where a standard part would do the job the quote says so.
Send the name, the size and the odd dimension
The row it belongs to, the thread and pitch, the one dimension that is not standard, quantity and material. A photo of the sample works too. From 1 piece, quote within 12 hours.