Fastener Standard Numbers — What Is ISO 4762, 10642, 7380?
European purchase orders and parts lists often identify a fastener only by its standard number — sometimes just 4762. The number itself tells you the part type. This guide covers 33 common part types and their ISO / DIN numbers; 28 of them are stocked by SFP Precision in Taiwan.
ISO 4762-M3X18-A2, ASME B18.3 .31-18 X .63 SST 18-8 SHCS
Reading a designation
Designations follow a fixed order: standard → size → material. For the most common socket screw:
ISO 4762Standard= part type
M3Thread3 mm metric
18Length18 mm
A2Material304 stainless
Other parts read the same way:
ISO 23383m610A2Dowel pin · Ø3 mm · tolerance m6 · 10 mm long · 304 stainless
DIN 471171A2Shaft retaining ring · 17 mm shaft · 1 mm thick · stainless
ISO 4032M6A2-70Hex nut · M6 · 304 stainless, property class 70
ISO 10642M51610.9 ZINCCountersunk socket screw · M5 × 16 mm · class 10.9 steel · zinc plated
Material and finish codes
Number lookup
Numbers on the same card are the international (ISO) and older German (DIN) standards for the same part type; common sizes are generally interchangeable, with small differences in head or thread length for some sizes.
Socket screws
Hex, Phillips & slotted screws
DIN 963DIN 964DIN 85
Set screws
DIN 914Nuts
DIN 467Washers
Pins
Retaining rings, keys & plugs
No match — try another keyword, or type it into the catalog search box.
Reading inch (ASME) descriptions
Inch socket screws are often described like this:
ASME B18.3Inch socketscrew standard
2-56#2 thread56 TPI
.383/8 in long(rounded)
SST 18-818-8 stainless= 304
FHCSFlat headsocket cap screw
Inch FHCS (ASME B18.3) have an 82° head; metric ISO 10642 heads are 90°. In the wrong countersink the head bears on one ring only and will not sit flush.
FAQ
What is ISO 4762?
ISO 4762 is the hexagon socket head cap screw (SHCS). It replaced the German standard DIN 912.
How do I read ISO 4762-M3X18-A2?
ISO 4762 is the part type (socket head cap screw), M3X18 is thread M3 and length 18 mm, A2 is 304 stainless steel.
Can an inch FHCS replace an ISO 10642 screw?
No. Inch flat head socket cap screws (ASME B18.3) have an 82 degree head, while ISO 10642 has a 90 degree head, so the countersinks differ.