Unisys distributes Safety Critical Fasteners for the Power Generation, Oil and Gas, Gas Pipeline, Nuclear, Rail, Marine, Petrochemical, Wind, and other energy industries. Unisys supply special bolting and CNC machined components for use in Safety Critical Applications.
We supply largest product range in all dimensions and grades and in any standards as well (ASTM, DIN, ASME, RCCM …). All our materials are certified HIGH INTEGRITY – “no compromise on quality”.
Our principal having all the key manufacturing processes, such as forging, heat treatment, thread-rolling, surface treatment, machining, testing, are performed in-house in order to guarantee the integrity of manufactured products.
We supply bespoke components to recognised standards such as BS, DIN, ISO, ANSI, or to customer specific requirements by means of drawings or samples. Our scope of supply covers all materials, and we specialise in components for use in Heat Resistant, Pressure Resistant or Corrosion Resistant applications.
We supply to order,ranging from one-offs, to small and medium batch quantities.
M2 to M200 (and imperial equivalents), all lengths available (lengths in excess of 4 metres can be catered).
We can supply headed components (Hex Bolts, Socket Head Capscrews, etc.) in all grades of alloys.
|Thread forms||All metric & imperial thread forms.|
|Bolts & Screws||Hexagon, 12 Point, Socket, Slotted, Square.|
|Studs||Double Ended, Waisted, Collar, Stud bolts.|
|Nuts||Hexagon, 12 Point, Capnuts, Round, Slotted, Barrel.|
|Washers||Round, Square, Spherical, Spring, Taper, Tab.|
|Machined Parts||Clevis Blocks & Pins, Tie Rods, Shafts, Spindles.|
Safety critical fasteners are used in the rotors, combustion chamber, exhaust and casing of a gas turbine. They provide a critical role in the assembly of the turbine and they are highly specified and must be made to tight tolerances to ensure efficient and safe functioning.
Stuctural bolts for casings
Bespoke special bolting for use in rotor applications
Our scope of supply includes, but is not limited to, the grades listed below.
We are also able to supply products with additional processes such as surface coating and heat treatment, including but not limited to:
All components can be supplied with full material certification, to ensure full traceability of components throughout the production and certification processes.
Our safety critical fasteners meet the strict requirements and standards of the power generation industry. The following are important performance characteristics for fasteners for power generation:
We supply fastening systems to the following:
|Gas and steam turbines : rotor bolts, coupling and casing.|
|Hydraulic turbines : studs and screws for Pelton, Francis, Kaplan turbines, bulb group, coupling and piping|
|Diesel engines : studs and connecting rod / cylinder head screws|
|Alternators : pole screws, non-magnetic screws|
|Valves and pumps|
|Completely controlled thread rolling for parts operating under fatigue.|
Certain material types are more desirable in the power generation industry due to them demonstrating superior performance in extreme temperatures and pressures. These materials, often when coated, also provide excellent resistance to solvents, chemicals, steam, and gases.
A193 B7, B16, B7M, A320 L7, L7M, L43, B8, B8M, B8T, A 453 Gr 660, EN 10269, 21CrMo4,2H,2HM,4, 7, 7M, 8 (S1), 8M (S1) and 8T (S1), ASTM A193 B8MX, ASTM A193 B8C, ASTM A193 B8TX, Alloy/Hastelloy™ C4, C22 + C276, Duplex UNS S31803 (F51), UNS S32550 (Ferralium® 255), UNS S31254 (254SMO/6Mo), Super Duplex UNS S32760 (F55), UNS S32750 (F53), Alloy/Monel™ 400 + K500, Alloy/Inconel™ 600, 601, 625, 718 + 825, Incoloy™ 800 H/HT, 925, 904L (Uranus® B6), Carpenter® 20 (CB20)
Durehete 900 (T22), 950 (T31) & 1055 (T41)
Jethete M152 & M448
C22 + C276
Alloy/Monel™ 400 + K500
Inconel™ 601, 625, 718, 825, Incoloy™ 800 H/HT, 925, 904L (Uranus® B6)
Carpenter® 20 (CB20)
Grade 2, grade 5, B5, B6, B7, B7M, B16, L7, A490, A325, 2H and more.
We use a wide variety of materials to suit any fastener application, including the following: