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Tachart Ltd t/a Bolt & Nut Manufacturing produces special fasteners and machined components for Pump manufacturers world-wide including bolts, capscrews, studbolts, capnuts, nuts and washers from a variety of alloys ranging from Durehete 950 through the austenitic, martensitic and duplex stainless steel range to exotic alloys such as alloy 286, Monel and Nimonic.

The modern pump manufacturer is a multi-skilled operation that must offer problem solving techniques and employ an exhaustive portfolio of engineering talent in order to address the needs that the modern world levies on the flow control industry.  Pump manufacturers are required to improve safety, reduce risk, improve efficiency, lower emissions, reduce waste and improve the environment.  It’s product must be a robust and reliable high quality engineered capable of operating in the most severe environments including corrosive, erosive, oxidising, pressurised, cryogenic and high temperatures.

The requirements of the modern valve manufacturer upon its supply chain are equally demanding. In order to maintain our “first choice” status for special fasteners and machined components with our pump customers, BNM utilises its vast metallurgical experience and knowledge that is the envy of our competitors and we hold an exhaustive library of national and international standards both current and historic. BNM has the intellectual competence to process and understand customer or project specific material specifications and quality plans with additional performance and testing requirements to a time scale.

In order to put ourselves in a position to “save the day” for our customers BNM utilises our flexible manufacturing approach and dedicated workforce to process urgent orders for immediate production and delivery. BNM stocks a large range of raw material, pre-vetted and tested a third party in order to offer enhanced delivery options when it really matters as many products can be machined and delivered the very same day including nickel alloys such as Hastelloy C22 and Hastelloy C276.

BNM also offers monitored delivery performance reporting for our pump customers and since our raw materials are fully traceable to the original mill certification we are able to manufacture products from favoured mills or from a specific origin. BNM is happy to receive quality audits from our customers and to regularly attend meetings that will enable us to tailor our services further including inventory control, Kanban and the arrangement of call off orders.

Typical fasteners (pumps):
Hexagon bolt, Setscrew & Slotted screw
Studbolt, Stud, Engineer’s stud, Elastic studs & Necked stud
Socket head capscrew
Hexagon nut, Lock nut, Slotted nut & Castle nut
Round nut & Capnut
Pin, Taper pin & Spring pins and Plug
Eyebolt & Swing bolt

Typical machined components (pumps):
Bulkhead plates & Bearing retainers
Pressure test equipment
Discs, Foundations sets
Impeller fittings
Rods, Shafts, Pressure plugs
Spindles, Tie bars, Wear plates

Typical Coatings: (flow control)
Teflon / PTFE / Xylan
Cadmium / Silver / Gold
Hot Dipped Galvanising
Zinc / Copper
Chromate Passivation
Zinc-Nickel / Zinc-Cobalt

Other Services:
Upset Forging
Heat treatment
Thread Rolling

Typical Testing Services:
Chemical Analysis
PMI Testing
Mechanical Properties
Proof Load
Magnetic Particle MPI
Liquid Penetrant LPI/DPI

Typical Standards:
ASME Code Section III
NACE MR-01-75
PED 97/23/EC
AD2000 W0 / W7 / W2
Norsok MDS M630

Typical materials (Flow Control)

Carbon, alloy & high tensile steels:
Durehete 1055
ASTM A193 B7 / B7M
ASTM A194 7 / 7M / 2HM
ASRM A320 L7 / L7M

Stainless steels:
17/4 PH
17/7 PH
ASTM A193 B8M / B8MCL2
ASTM A194 8 / 8MA
ASTM A453 660
Alloy 20 /Carpenter20
Duplex (S31803) F51
Super Duplex (S32760) F55
Ferralium 255 / Amazon 256
Nitronic 80A
Nitronic 90

Nickel Alloys:

Cupro-Nickel Alloys:

Brass & Bronzes:
Aluminium Bronze
Nickel-aluminium Bronze
Aluminium Silicon Bronze
Phosphor Bronze

Aluminium, Zirconium, Titanium

Special Fasteners, Machined Components and Bolt Manufacture in the UK, delivering World Wide.