Threaded Inserts
Threaded inserts for plastics, composites and PCBs. Heat-set, ultrasonic, press-fit, moulded-in, knurled and self-tapping inserts, produced to your hole dimensions and knurl specification. Threaded inserts are one of the largest product lines at Jay Ashapura Precision Metals.
The actual parts
Inserts made at Jay Ashapura.
Not catalogue renders. These are photographs of inserts produced on the floor in Jamnagar, across knurl patterns, body styles and finishes. Yours is machined to your drawing, not picked from this page.
Thread standards produced
- ISO Metric
- UNC
- UNF
- BA
- BSW
- Custom to drawing
Finishes & coatings
- Natural brass
- Electro tin
- Nickel
- Chrome
- Silver
- Gold
- Zinc blue
- Lead-free options
Thread standard, knurl pattern, body style and finish are all set by your drawing. Send it and get a quote →
Types we supply
Every insert type, for every substrate.
Matched to your plastic, installation method and load. Standard styles, or fully custom knurl patterns to your drawing.
Install by Heat / Sound
- Heat-Set Inserts
- Ultrasonic Inserts
- Thermoplastic Inserts
- 3D-Printing Inserts
Install by Force
- Press-Fit Inserts
- Self-Tapping Inserts
- Expansion Inserts
- Knurled Inserts
Mold-In & Board
- Molded-In Inserts
- Injection-Molding Inserts
- PCB Inserts
- Blind & Through-Hole
Threaded & Special
- Threaded Inserts
- Wire Thread (Helical)
- Threaded Standoffs
- Captive / Panel Inserts
- Custom Inserts
Not only brass. The same part can be produced in stainless steel, copper, aluminium and other engineering alloys. Send the drawing with the grade you need and it is quoted in that material. See full material range →
Where they're used
Applications & industries served.
Applications / substrates
- Injection-molded plastics
- Thermoset & thermoplastic
- 3D-printed parts
- Die-cast & composites
- PCB & electronics housings
- Enclosures & consumer devices
Industries served
- Electronics & consumer devices
- Automotive & EV
- Medical devices
- Telecom & IoT
- Appliances
- Aerospace & defense
See all the sectors we serve on our Industries page.
Materials for inserts
Certified metal, traceable by lot.
Free-machining brass for clean knurls and threads, low-lead grades where compliance requires it, and stainless steel where the environment is harsh. See full quality & traceability →
Free-Cutting Brass
C36000 · CW614N, standard inserts, crisp knurling
CZ121 / CuZn39Pb3
Excellent machinability for fine threads
Low-Lead & Eco Brass
Medical, food-contact & RoHS compliance
Stainless Steel
303 / 316, corrosion resistance & higher strength
How they're made
Manufacturing process.
Bar stock
Certified free-cutting brass bar selected for machinability and thread quality.
CNC turning
Bodies turned on CNC and Swiss lathes to precise OD, length and internal bore.
Knurling & threading
External knurl patterns for retention and internal threads tapped and gauged.
Inspection & test
Dimensional, thread and (on request) pull-out/torque validation before packing.
*on request, tested in your substrate. Threads: ISO Metric · UNC · UNF · BA · BSW · custom to drawing.
Finishes, inspection & packaging
Delivered ready to install.
Surface finishes
- Natural brass
- Electro tin
- Nickel
- Chrome
- Silver
- Gold
- Zinc blue
Inspection
- Thread gauge
- Dimensional (FAI)
- Knurl & OD check
- Bore concentricity
Testing
- Pull-out / jack-out
- Torque-out
- Installation trial
- Material verification
Packaging
- Bulk / poly-bagged
- Counted packs
- Tape & reel (small)
- Custom-labeled
Documentation ships with the order. See our full quality standards →
Custom inserts
Built to your drawing.
Send your plastic type, hole geometry and load requirement, or a sample, and we'll build the right insert to print, with the correct knurl, length and thread, from prototype to high-volume production.
- Reverse engineering from sample
- Custom knurl patterns
- Special lengths & threads
- Prototype to high-volume
Threaded inserts FAQ
Questions, answered.
Which thread standards do you produce inserts in?
ISO Metric, UNC, UNF, BA and BSW as standard, plus any custom thread to your drawing. Tell us the thread and class of fit and it is produced and gauged to that.
What finishes are available on threaded inserts?
Natural brass, electro tin, nickel, chrome, silver, gold and zinc blue. Lead-free options are available where the application requires compliance. If you need a finish matched to an existing part, send a sample.
What is the difference between heat-set and ultrasonic brass inserts?
Both install into plastic by melting it around the insert. Heat-set inserts are pressed in with a heated tip and are ideal for thermoplastics and 3D-printed parts; ultrasonic inserts use high-frequency vibration for fast, high-volume assembly. We supply both, plus press-fit and mold-in styles.
Which brass insert should I use for injection-molded plastic?
For molded-in applications, use mold-in inserts placed in the tool before molding. For post-mold assembly, heat-set or ultrasonic inserts are most common. Send your plastic type and boss dimensions (the molded hole the insert seats into) and we'll recommend the right style and knurl pattern.
Do you perform pull-out and torque testing on brass inserts?
Yes. Inserts can be pull-out (jack-out) and torque-out tested in your substrate to validate retention, with test reports supplied on request.
What sizes and threads do you make brass inserts in?
Common sizes run from M2 to M12 and #2 to #10-32 UNC/UNF, with metric and imperial internal threads. Custom sizes, knurl patterns and lengths are made to your drawing.
Are lead-free brass inserts available for medical or food-contact use?
Yes. Low-lead and eco-brass grades are available for medical, food-contact and RoHS-compliant applications, with documentation provided.
Related: Fasteners & Standoffs · Electrical & Electronics · Manufacturing capabilities
Need threaded inserts?
Send your drawings, plastic type or a sample. We'll recommend the right insert, brass grade and finish.
Request a Quote