Sub Contract CNC Machining Services
Bon Precision Engineering provides subcontract CNC machining services to manufacturers, engineers, designers and procurement teams across the UK. Operating modern Star and Citizen sliding head CNC machines from our Northamptonshire facility, we specialise in the production of high-precision turned components manufactured to customer drawings, samples and specifications.
We can manufacture any volume of components and have worked with product designers to produce prototype parts for testing, through to high-volume runs of parts which can be scheduled and called off from stock.
CNC Sliding Head Machining Specialists
Our CNC sliding head machining capabilities allow us to produce complex turned parts with exceptional accuracy, consistency and repeatability.
- Precision Turned Components
- Bespoke Machined Fasteners
- Dowel Pins
- Clevis Pins
- Taper Pins
- Threaded inserts
Materials we work with
Stainless Steel A1 (303) • Stainless Steel A2 (304) • Marine-Grade Stainless Steel A4 (316) • Mild Steel • High Tensile Steels • Brass • Plastics • Aluminium • Exotic Materials
CNC Subcontracting
Our extensive product range
Our external self-tapping thread forms are unique to our blind and through tapped insert range. We’ve invested in tooling specifically made for us, so consistency in function and appearance is guaranteed.
Our blind form inserts (IBS range) are ideal for marine use or in any applications where a waterproof fit is required and water ingression along the internal thread could be an issue.
Through tapped form (ITS range) are ideal for applications where there is clearance behind the insert, so bolt length is not critical.
Our insert range has been carefully designed to fit flush when installed, with the addition of an undercut and countersunk head.
Features of our self-tapping inserts
- Suitable for use in wood, composites, plastics and some soft metals.
- Can be screwed into a pre-drilled hole or bonded/ moulded into place.
- Supplied in regular or heavy-duty form with a coarse self-tapping thread, larger external diameter, longer length and V shaped flutes at 120-degree intervals for additional grip when bonded.
- Available in a range of internal threads, metric and imperial. Can be made to specific customer requirements.
- We also manufacture the more generic slotted style self-tapping inserts with finer external threads, more suited to use in metals and harder materials.
Also known as thread reducing inserts (ITR). These inserts are similar in form to our IBS/ ITS inserts but feature standard metric or imperial internal and external threads in any combination or length required, both blind ended and through tapped.
We also produce an unheaded range, which allows you to screw the insert as far in as you need to give a little more flexibility with the application.
Ideal as a solution to stripped or damaged threads where the damaged hole can be drilled and re-tapped. Also suited for use in materials which can be pre-tapped, or where a coarse self-cutting thread may not be appropriate, such as carbon fibre or hard brittle plastics which can crack and splinter.
They can also be used in soft metals such as aluminium where a small thread is required, but the inherent softness of the host material doesn’t offer the required strength.
We stock in stainless steel 316, and can supply in a wide variety of other materials.
Sometimes known as hinge pins, link pins or rigging pins. Commonly found in the marine, agriculture and automotive industries manufactured in 316/ 303 stainless to DIN and ISO standards. We can supply in a range of materials, made to order.
Available headed with a cross drilled hole for an R-clip or split pin or grooved for a circlip. Also available headless or cross drilled at either end.
Steel dowel pins are used in a wide range of precision engineering applications to provide accurate location and alignment.
Our standard dowels have chamfered or radiused ends to enable insertion and to guide positioning:
- ISO 2338
- BS 1804
- DIN 6325
- DIN 7
Custom Dowel Pins
Of course, sometimes ‘standard’ just won’t cut it, and something more bespoke is required. We offer a non-standard dowel pin service to accommodate any bespoke requirements you may have.
Available in a range of materials including marine grade stainless steel 316 (A4) /303/mild steel and silver steel.
These are dowel pins with an internal thread to enable extraction of the pin after installation.
We can easily manufacture these pins with an air or oil release flat along the length. Made to the diameter tolerance requested or to ISO8735 standard.
Available in stainless steel 316/303 or mild steel to DIN 1B or DIN 1A standards.
Manufactured with a 1:50 taper along the length and radiused ends. Our taper pins can also be manufactured with imperial 1:48 tapers, or fully customised to your specifications
Manufactured as per a regular taper pin but with either a male (DIN 7977) or female (DIN 7978) thread for extraction after installation.
We also make taper pins to specific non-standard requirements.
Available as a ‘made to order’ item in any material, length, or internal and external diameter to customer requirements.
Can be supplied either internally threaded or clearance sized.
Looking For A Reliable CNC Machining Partner?
Get A Free Subcontract Machining Quote
If you’re looking for a subcontract CNC machining company that combines technical expertise, responsive service and high-quality manufacturing, we’d be delighted to discuss your requirements.
Send us your drawings, specifications or project details and we’ll be happy to provide advice and a competitive quotation.
Join our growing list of happy customers
Don’t just take our word for it—read what our customers say about Bon Precision Engineering. Our reputation and integrity mean everything—and we are proud to have received some great feedback from our customers.
Contact Us
“I've worked with Bon Precision both commercially and as a boat owning aficionado and can't recommend them highly enough.Their desire to fulfil your every requirement is legendary, complimenting perfectly their refreshingly efficient despatch and delivery times. A joy to do business with.”
"We work with Treehouses, Rope Bridges and rope-work balustrades internationally, as such designing and looking for very specialist production of stainless steel fixings suitable for marine environments. On a search for threaded inserts, we were delighted to discover Bon Precision and on enquiry became very excited that we were dealing with not only a supplier but an expert company who could design, fabricate and test very specialist requirements.We had a huge quantity order for a project in the Middle East, the team at Bon Precision engaged fully and immediately with the project, sent a range of samples and designed a bespoke solution to our specific requirement. Our customers demand world-class quality and certification plus the ability to respond to bespoke and crafted requirements. Our projects worldwide are hugely supported by the first-class service and commitment given by Bon Precision.”
D&M Tech have worked with Bon Precision Engineering on several projects. They have produced a variety of CNC turned components for us, with fast turnaround times and excellent communication. We were particularly impressed when you managed to turn a component to 0.46mm diameter for a complex component. We’ve found Bon Precision Engineering to be very knowledgeable, helpful and easy to work with.