Product range
Special fasteners
RS Randack Spezialschrauben
Your specialists for special and custom fasteners: RS Randack Spezialschrauben GmbH
High-quality bolts, screws, nuts and fasteners requiring third-party inspection, for every application
Special fasteners to drawing and standard
We turn your ideas for special fasteners into finished parts quickly and efficiently, using a wide range of manufacturing methods. We process a broad variety of materials (structural and quenched and tempered steels, stainless steels, non-ferrous metals, special alloys, etc.) to meet your specific product requirements.
Certified and qualified subcontractors ensure consistent heat treatment and surface treatment in line with specifications.
Quantity is no obstacle: from single parts to series of several thousand pieces. Rush orders are one of RS Randack’s strengths. You will hear from us within a few hours. In many cases, delivery within 24 hours is possible.
Products
Special fasteners to drawing and standard
Special fasteners to drawing
Hex bolts, socket head cap screws, T-head bolts and special head bolts, forged with uninterrupted grain flow, in property classes 5.6 to 12.9 and special strengths.
Reduced-shank bolts and fitted bolts
Reduced-shank bolts to DIN 2510 and to drawing, fitted bolts with fits up to H7, lengths typically up to 3,500 mm.
Special nuts
Hex, heavy hex, cap and slotted round nuts, forged and hot-pierced, internal threads tapped or turned, typically up to M80, matched to the bolt.
Turned parts
Flanges, bushes, sleeves, axles and shafts to drawing, typically up to 300 mm diameter and 3,500 mm length.
Cold-formed parts
Rivet studs, press-in parts, bushes and headless bolts made by multi-stage forming and two-blow heading for large series.
Standards we manufacture to
- Mechanical properties: including ISO 898-1 and 898-2, EN 10269 for elevated and low temperatures, ISO 3506 for stainless steels
- Dimensional standards: ISO 4014, 4017, 4032, 4762 and DIN 931, 933, 934, 912, 609, 610, 2510, 976, as well as parts to drawing
- American: including ASTM A193, A320, A194, ASME B1.1 and B18.2.2, heavy hex
- Certificates to EN 10204, tolerances to ISO 4759, coatings including to ISO 4042 and ISO 10683, over 100 coating variants in total
Materials
- Quenched and tempered steels, including 42CrMo4 (1.7225), 25CrMo4 (1.7218), 30CrNiMo8 (1.6580), 34CrNiMo6
- Creep-resistant and high-temperature steels, including 21CrMoV5-7 (1.7709), 40CrMoV4-6 (1.7711), X22CrMoV12-1 (1.4923), 1.4913
- Stainless steels 1.4571, 1.4057, 1.4462 duplex, 1.4980, special austenitic steels such as 1.3974
- American grades B7, B7M, B16, B8, L7, L7M, 2H, 4, 7, 8
- Nickel-based alloys and titanium, special materials to specification
All materials from European mills with mill certificate for each heat; verified in our own materials laboratory.
300 mm
Diameter of turned parts
3,500 mm
Length of turned parts
M180
Rolled threads
M80
Internal threads
3,000 kN
Tensile test
−70 °C
In-house Charpy impact test
Typical limits in each case; beyond these on request.
Send us your enquiry for special fasteners to standard or drawing
Urgent? You will hear from us within a few hours.
RS Randack Spezialschrauben
Special fastener product range
Rivet studs, press-in parts, bushes and headless bolts made by multi-stage forming and two-blow heading, produced in large series by qualified partners, tested and documented in Hagen. More under Cold-formed parts.
Fasteners by RS Randack
Examples of special and custom fasteners
Special and custom fastener service
In-house production in Hagen with forge, toolmaking, CNC machining, thread rolling, nut machining and materials laboratory: that is the advantage when sourcing your special and custom fasteners, from steel to certificate, all from a single source.
As specialists in special and custom fasteners as well as special parts and parts to drawing, we advise you on material, thread, property class and testing, and choose the right production route for your individual case; the steps are shown on our Production page.
Special and custom fasteners from RS Randack are in service worldwide in plant engineering, chemicals and petrochemicals, energy and power plant engineering, shipbuilding and marine, rail, mining, aerospace, power transmission and mechanical engineering: industries and applications.
Quality assurance for our special fasteners
Quality assurance measures accompany your special and custom fasteners from enquiry to delivery.
Manufacturability analyses and technical reviews against the specified order drawings, DIN standards and specifications identify potential sources of error at an early stage.
Every special fastener passes through our quality assurance checks: first article inspection under the four-eyes principle, hardness testing per batch, thread inspection with gauges and thread micrometer, final inspection before shipping, all with traceability back to the heat.
Destructive and non-destructive product tests are carried out and certified by our own test personnel and by independent, accredited materials testing laboratories.
Frequently asked questions
Questions and answers on special and custom fasteners
What is the difference between special fasteners and standard fasteners?
Standard fasteners follow a standard in shape, material and property class and are bought from a catalogue. Special fasteners differ in at least one respect: dimensions, head shape, material, property class, thread, testing or certificate. RS Randack manufactures them to your drawing, even as one-offs.
What information does RS Randack need for a quotation?
Drawing or standard, material and property class, quantity, certificate type, third-party inspection body (if required), coating and delivery date.
Does RS Randack supply fasteners with a 3.2 inspection certificate?
Yes. Third-party inspections by all common inspection bodies and classification societies take place regularly in our own materials laboratory in Hagen; certificates 2.1, 2.2, 3.1 and 3.2 to EN 10204.