Industry
Special fasteners for power transmission and mechanical engineering
Fitted bolts, reduced-shank bolts and socket head cap screws for couplings, gearboxes and presses
Industry we supply today
Fitted bolts, reduced-shank bolts and socket head cap screws for couplings, gearboxes and presses
Couplings, gearboxes, presses, rolling mills, cranes and conveyor systems transmit high torques and forces through just a few bolts. Fitted bolts must carry shear forces by positive fit, reduced-shank bolts must absorb alternating loads elastically, and socket head cap screws in 12.9 must deliver maximum preload in confined spaces. RS Randack manufactures these fasteners to drawing for power transmission and mechanical engineering manufacturers, in batches from a few pieces to several thousand, with fits machined in our own turning shop and rolled threads.
Typical parts
- Fitted bolts and dowel pins to DIN 609, DIN 610 and to drawing, with shank fits to H7, for shaft couplings and flanges
- Socket head cap screws to ISO 4762 in property class 12.9 in special lengths, with collar, spigot or fine thread
- Reduced-shank bolts to DIN 2510 and reduced-shank studs for gearbox housings, presses and rolling bearing assemblies
- T-head, square head and special head bolts from our own forge for T-slots and fixtures
- Tie rods, tension bolts and threaded rods, typically up to 3,500 mm long, with matching nuts and washers
Requirements and documentation
- Form and position tolerances on fit diameters, radial and axial runout, checked on the 3D coordinate measuring machine
- Property classes 8.8 to 12.9 verified on the test bar and on the full-size bolt
- Fatigue strength through rolled threads, rolled after heat treatment for alternating loads
- Inspection certificate 3.1, first article inspection and batch documentation to customer requirements, zinc flake coating or black oxide
What RS Randack brings
CNC turning centres up to 300 mm diameter with surface finishes down to Ra 1.6 and fits to H7, in-house forge for special heads, thread rolling up to M180, materials laboratory and measuring room with over 400 calibrated measuring and test instruments, express service for installation deadlines and downtime. Sub-sectors: couplings and brakes, gearboxes and rolling bearings, presses and forming machines, rolling mill and metallurgical plant engineering, cranes and hoists, conveying and intralogistics, pumps and compressors, special-purpose machinery.
Frequently asked questions
Questions and answers about power transmission and mechanical engineering
Does RS Randack manufacture fitted bolts with an H7 fit?
Yes, fitted bolts and dowel pins to standard and to drawing with shank fits to H7, in quenched and tempered steels up to 12.9 and in stainless materials, with a dimensional report on request.
What batch sizes are typical?
From a few pieces to several thousand per order. Small series of parts made to drawing are RS Randack’s day-to-day business.
Enquire about fasteners for your machine
Urgent? You will hear from us within a few hours.