Bolts and Screws
Hex head (DIN 931 / 933, ISO 4014 / 4017), socket head cap (DIN 912, ISO 4762), countersunk socket (DIN 7991, ISO 10642), button head socket (ISO 7380) and flange bolts (DIN 6921).
PRODUCT GROUP · 01 / 08
Fasteners
Bolts, nuts, washers, studs, screws and rivets
From standard catalogue items to project-specific fasteners, we support your supply process with the right standard, property class, material and coating.
OVERVIEW
Fasteners
SUPPLY
The safety of an assembly often depends on its smallest part: the fastener. The wrong property class, a mismatched nut and bolt, or a coating unsuited to the environment can lead to loosening, corrosion and failure. That is why we approach fastener supply through operating conditions, not just dimensions.
We evaluate requests for metric and imperial fasteners to DIN, ISO, EN and ASTM/ANSI standards based on standard, size, property class, material, coating and quantity. Together, we identify suitable alternatives that meet the technical expectations of industries such as defence, railway, energy, steel construction and machine building.
PRODUCT RANGE
Fasteners
CATEGORIES
You can also send requests for products not listed here.
Nuts
Hex nuts (DIN 934, ISO 4032), nylon insert lock nuts (DIN 985, ISO 10511), flange nuts (DIN 6923), dome cap nuts (DIN 1587), weld nuts (DIN 929) and wing nuts (DIN 315).
Washers
Flat washers (DIN 125, ISO 7089), large washers (DIN 9021), spring lock washers (DIN 127), serrated lock washers (DIN 6798) and wedge-locking washers.
Studs and Threaded Rods
Threaded rods (DIN 975 / 976), studs (DIN 938 / 939), and ASTM A193 B7 studs with A194 2H nuts for flange connections.
Screws and Set Screws
Self-drilling screws (DIN 7504), sheet metal screws (DIN 7981 / 7982), metric pan head screws (ISO 7045), set screws (DIN 913–916, ISO 4026–4029).
Rivets
Blind (pop) rivets, rivet nuts and solid rivets (DIN 660 / 661) in aluminium, steel and stainless steel.
Anchors and Plugs
Steel wedge and sleeve anchors, chemical anchoring systems, hammer-in anchors and plastic wall plugs.
Structural Bolting Assemblies
High-strength HV bolt, nut and washer assemblies to EN 14399 for steel structures.
Pins and Retaining Rings
Shaft and bore circlips (DIN 471 / 472), spring pins (DIN 1481), dowel pins and split pins (DIN 94).
TECHNICAL INFORMATION
STANDARDS AND
PROPERTY CLASSES
Common standard equivalents and strength classes used when selecting fasteners. Values are nominal; refer to the relevant standard for exact figures.
DIN – ISO EQUIVALENTS
| Product | DIN | ISO |
|---|---|---|
| Hex bolt, partially threaded | 931 | 4014 |
| Hex screw, fully threaded | 933 | 4017 |
| Socket head cap screw | 912 | 4762 |
| Countersunk socket screw | 7991 | 10642 |
| Hex nut | 934 | 4032 |
| Nylon insert lock nut | 985 | 10511 |
| Flat washer | 125 | 7089 |
| Set screw, flat point | 913 | 4026 |
| Set screw, cup point | 916 | 4029 |
BOLT PROPERTY CLASSES
| Class | Tensile (MPa) | Yield (MPa) | Nut |
|---|---|---|---|
| 4.6 | 400 | 240 | 5 |
| 8.8 | 800 | 640 | 8 |
| 10.9 | 1000 | 900 | 10 |
| 12.9 | 1200 | 1080 | 12 |
| A2-70 | 700 | 450 | A2-70 |
| A4-80 | 800 | 600 | A4-80 |
Carbon steel classes are covered by ISO 898-1 and stainless classes by ISO 3506-1. Yield values for stainless steel are 0.2% proof stress.
Zinc Electroplating
Clear or yellow zinc plating; an economical choice for indoor and mildly corrosive conditions.
Hot-Dip Galvanising
A thick zinc layer for long-lasting protection outdoors and on steel structures.
Zinc Flake
High corrosion resistance; preferred for high-strength bolts as it involves no electrolytic process.
Black Oxide / Phosphate
Common on socket screws, oiled finish; for indoor and machinery applications.
APPLICATIONS
TYPICAL
APPLICATIONS
- Machinery and equipment manufacturing
- Steel structures and construction
- Defence and aerospace projects
- Railway and rail systems
- Power plants and facilities
- Petrochemical flange connections
- Automotive suppliers
- Maintenance, repair and operations (MRO)
FREQUENTLY ASKED QUESTIONS
ABOUT
Fasteners
Is there a difference between DIN 933 and ISO 4017 bolts?
Both standards define fully threaded hex head screws and are used as equivalents. The difference is the width across flats for some sizes: M10 is 17 mm in DIN 933 but 16 mm in ISO 4017; M12 is 18 mm instead of 19 mm; M14 is 21 mm instead of 22 mm; and M22 is 34 mm instead of 32 mm. This should be considered when choosing tools and assembly fixtures.
What do property classes 8.8, 10.9 and 12.9 mean?
The first number is one hundredth of the nominal tensile strength (8 → 800 MPa); the second indicates the ratio of yield strength to tensile strength (.8 → 80%). So a class 8.8 bolt has a nominal tensile strength of 800 MPa and a yield strength of 640 MPa. Higher classes carry more load, but the nut class must match the bolt (e.g. a class 10 nut for a 10.9 bolt).
Should I choose A2 or A4 stainless steel bolts?
A2 corresponds to 304-type austenitic stainless steel and is suitable for general indoor and outdoor environments. A4 is molybdenum-alloyed 316-type steel, preferred in highly corrosive settings such as marine environments, chlorides, swimming pools and chemical plants. The number after the dash (-70, -80) indicates the strength class.
Which coating is suitable for high-strength bolts?
Electroplating high-strength bolts such as 10.9 and 12.9 can introduce a risk of hydrogen embrittlement. For these classes, zinc flake coatings or suitably treated coating options are considered. Hot-dip galvanising is common for outdoor steel structures; in that case nuts must be selected with an appropriate thread tolerance.
Can I request imperial (UNC / UNF) fasteners?
Yes. In addition to metric sizes, you can send requests for imperial fasteners such as UNC and UNF. Providing the size, thread type, material/grade (e.g. SAE J429 Grade 5, Grade 8) and quantity speeds up the evaluation.
What information should I send for a quote?
The standard, size, property class or material, coating, quantity and any certificate requirements are sufficient. A technical drawing, sample photo or existing part number also speeds up the process. You can send these details via the form or by email.
QUOTE / INFORMATION REQUEST
CONTACT US ABOUT
Fasteners
Send your request via the form or call us directly.
EMAIL[email protected]
ADDRESS
İvedik OSB Mah. Melih Gökçek Blv. No:83/28
Yenimahalle / ANKARA, TÜRKİYE
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