Brass Threaded Insert Manufacturer, USA

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Brass threaded insert with straight knurling for plastic molding
Straight knurled brass insert for plastic molding applications
Straight knurled brass insert for thermoplastic plastic molding

Brass Threaded Inserts Supplier & Manufacturer USA

Brass Threaded Inserts for Plastics - Clean Threads That Lock and Hold

We do not manufacture brass threaded insert just for specification. We cut them to perfect fit that hold, moves, flexes, and shrinks over time. Every batch we dispatch goes to through tight quality checks, quality thread gauge inspections, and real press-fit logic.

Required heat set insert for Nylon, Flanged press-in for glass filled PC? We have manufactured every type of Brass Threaded Insert in the book. We complete one batch of M8 inserts that loose in field installs. We changed knurl geometry, and ran a 15 piece test, and looked at it.

Looking for brass inserts that fit clean and hold tight?
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Brass Threaded Insert Design Types We Machine

We make threaded inserts for everything from injection molds to aerospace grade enclosures. Each design type serves a different job. Geometry matters.

Straight Wall Inserts

  • Most common. Balanced grip and strength thread
  • Can be press-fit and heat-installed
  • Easy to automate with vibratory feeders

Flanged Inserts

  • With an outer collar to stop over-pressing.
  • Often used in soft plastics and thin-wall section.
  • Helps prevent insert pull through.

Hex Body Inserts

  • Flat sides for anti rotation
  • Best in molded-in installs and high-torque application
  • Slightly harder to install, but locks firm.

Slotted or Split Inserts

  • Designed to expand when screwed in
  • Great for soft plastics where you want a firm bite
  • Can compensate for ID variation

Closed-End Inserts

  • Thread does not pass through
  • Prevents screw over travel
  • Common in sealed electronics and enclosures

We manufacture all of these above listed. Some batches need OD tolerance maintained down to ±0.05 mm and some need to thread pitch to be looked within class 2B. If your part calls for something not off the shelf, we can do it.

Internal Threading & Tolerances - How Tight Do We Cut?

You will not find unclear specs here. We thread on Swiss type lathes, clean taps, and bore check every critical batch.

  • Metric threads: M2 to M12, 6H class fit

  • UNC/UNF threads: 2-56 up to 5/16-18, 2B fit class

  • Thread pitch gauge checks every 10 pcs for short runs

  • Go/No-Go ring check for production batches

  • Visual & deburr pass after cut: we catch burrs before you do

In our one order a plating vendor left buildup inside M5 threads. We checked go gauges on all 2000 Pieces and caught 180 pieces that failed. Cleaned, recut and rechecked. That is why our threads work when they hit the line.

Installation Options - Focused on Thread Retention

Unlike generic Brass Inserts , these are all about threads that hold under load, vibration, and torque.

Insert Type Install Method Tools Needed Strength Profile
Press-In Manual/Press Arbor press, jig High pull-out resistance
Heat-Set Heated tip Thermal driver Medium to high, fast fit
Self-Tapping Screw-driven Driver gun Quick install, moderate strength
Expansion Threaded bolt expands body No external press High lock after set

Every insert type behaves differently. Press-ins need sharp OD knurl. Heat sets demand tapered bodies and chamfer rings. Expansion types? We tap those slots and ream bores to ±0.05 mm so they flex clean.

Threaded Insert Applications – Where They End Up

This is where our inserts actually use:

  • Telecom junction boxes (UK, USA): M5 and M6 press-in hex

  • Medical lab equipment (Germany): heat-set inserts into ABS with closed-end threads

  • Appliance housings (India, EU): high torque flanged inserts

  • Drone mounts (USA): M4 spiral cut, self-locking

  • Automotive engine plastics (OEMs): molded-in brass threads with Class 3 fit

Each batch and order has a story. One drone OEM requested to pull out data at 800N for their carbon reinforced parts. We tested on 5 blocks, pressed 10 samples testing and delivered.

Our Thread Quality Control – Not Just a Spec

We cut threads with carbide taps and single point tool. It is depending on thread depth and geometry. After cut:

  • Visual inspection: No blind chips

  • Gauge pass/fail: Go/No-Go ring and plug gauges

  • Depth verification: Checked with probe and feeler

  • Torque test (if required): As per customer driven spec

Some of our flanged closed end inserts need a blind thread to ±0.10 mm from the base. It is mean by setup checks, tooling stop, and thread relief bore matching.

We do not ship threads we would not bolt into ourselves.

Common Fit Failures - And How We Prevent Them

Threaded inserts look simple until something goes wrong and it does. We have witnessed everything and we try to avoid it.

Spin-Out After Install

Plastic may have cracked because of knurl height was too aggressive. We can fix with by maintaining perfect OD and testing in five ABS pilot blocks.

Burrs Inside Thread

Some materials are smear. We had one order of C385 that pushed a burr on thread exit. Our QC team caught it during GO/NO-Go testing. Swapped the tap, added a pass with air-blast, and shipped clean threads.

Press Fit Too Loose

Collet was off by 0.03mm. We did not wait for response and re-ran the lot. Client never found the issue.

Plating Buildup

Threads came back nickel plated with tight pitch. We now oversize threads 0.02 mm before plating and run 100% gauge test after.

We do not expect inserts to install “close enough.” We make them right and we ship them.

Reorder Consistency – Every Batch, Every Time

Getting the result of 1,000 parts right is one thing. Getting them right each time, six months later? That is where our process we holds

  • Tool IDs tracked: Inserts are made with assigned cutter. If cutter wore out last time, it is logged and replaced.

  • Setup sheets saved: Each batch has spindle speed, tool number, offset, and work holding method in our archive.

  • Fixture duplication: Same collets, same clamps and repeatable OD, thread pitch, and knurl.

  • Thread gauges matched to order: We use customer specified tolerance class if needed.

  • Part photos archived: We keep sample images from visual inspection on file.

We do not just repeat the drawing – we repeat the manufacturing.

Brass Threaded Insert FAQ

Q1: Can you make OEM custom threads brass inserts?

Yes. We have manufacture non-standard threads for OEM clients. We need clear thread pitch and tolerance zone in the drawing.

Q2: Can your inserts be plated after machining?

Yes. We work with RoHS and CE plating partners for nickel, tin plating. Threads are cleaned and gauged after plate. We do not ship plated threads unless they pass fit.

Q3: What about blind holes and short threads?

We cut closed end inserts all the time. Some are as short as 5 mm with only 3-4 full threads. We use short form taps and single point threading to control thread start and finish.

Q4: Do you ship brass inserts to USA and other countries?

Yes, we can handle efficient shipping to USA, UK, Europe, Germany and other territories.

Q5: Do you include quality assurance, material and inspection report?

Yes, Every order goes through strict quality checks. We can send inspection reports, material certifications, and dimensional verifications to meet your requirements.

Q6: What is the process to get quotation for brass threaded insert?

Simply you have to send product drawing or sample for diameters. Then we offer you quick quote. We also support competitive pricing for bulk quantities.

Why Buyers Keep Coming Back for Threaded Inserts

  • We check all quality checks before shipping. One client’s plated threads came back too tight. We re-checked all gauges, fixed the pitch error, and reworked clean.

  • We adjust when it matters. A heat-set insert once melted part walls due to knurl height. We revised knurl down by 0.02 mm and retested in real ABS blocks.

  • We do not overpromise. If we cannot hit your thread depth cleanly, we say so up front.

  • We fix what we cut. Bad tool? Chipped tap? We do not hide it. We re-run it.

Ready to Order Brass Threaded Inserts That Actually Work?

Whether you need press-in, self-tapping, closed-end flanged inserts, we machine them with thread-first accuracy and full inspection.

We ship regularly to the USA, UK, Europe, and Asia.


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