Machine shop Checked Oct 8, 2026

Jtr Specialties Inc.

South El Monte, CA · prototype to production

Certifications · select one to see where it is stated

About

A machine shop in South El Monte, California that grinds, hones, laps and bores parts to customer prints for aerospace, defense, automotive and medical customers. It also does engine and hydraulic cylinder work such as cylinder honing, valve seat machining and line boring.

Summary written by Kerfgrid from jtrspecialties.com.

Processes

Select a process to see the sentence it comes from.

Materials: Aluminum, stainless steel, titanium, nickel alloys, tool steel, cast iron
Industries: Aerospace, defense, medical, automotive, marine, general industrial
Volumes: Prototype to production
Holds: ±0.0001"

Where each detail comes from

Processes · Grinding
“Surface, OD, and ID grinding, journals, and bores.”
jtrspecialties.com
Processes · Lapping and polishing
“OD, ID, and flat lapping for surfaces that must seal on contact.”
jtrspecialties.com
Processes · Boring
“Line boring machines all of the bores in one setup along a single axis”
jtrspecialties.com/capabilities/line-boring/
Processes · Machining
“Seats, guides, and valve faces machined concentric for seal and airflow.”
jtrspecialties.com/capabilities/
Materials · Aluminum
“We cut Inconel, titanium, 17-4 PH stainless, and aerospace aluminum every day”
jtrspecialties.com
Materials · Stainless steel
“We cut Inconel, titanium, 17-4 PH stainless, and aerospace aluminum every day”
jtrspecialties.com
Materials · Titanium
“We cut Inconel, titanium, 17-4 PH stainless, and aerospace aluminum every day”
jtrspecialties.com
Materials · Nickel alloys
“We cut Inconel, titanium, 17-4 PH stainless, and aerospace aluminum every day”
jtrspecialties.com
Materials · Tool steel
“That makes it the standard route for hardened tool steel, wear surfaces”
jtrspecialties.com/capabilities/surface-grinding/
Materials · Cast iron
“03 / Materials Cast iron Steel liners Aluminum with liners Hydraulic cylinder tube”
jtrspecialties.com/capabilities/cylinder-honing/
Certifications · ISO 9001
“ISO 9001 Quality system certified and audited.”
jtrspecialties.com
Industries · Aerospace
“Honing, grinding, and lapping for all aerospace, automotive, and medical work”
jtrspecialties.com
Industries · Defense
“machined the parts that aerospace and defense programs rely on”
jtrspecialties.com
Industries · Medical
“Honing, grinding, and lapping for all aerospace, automotive, and medical work”
jtrspecialties.com
Industries · Automotive
“Honing, grinding, and lapping for all aerospace, automotive, and medical work”
jtrspecialties.com
Industries · Marine
“Diesel and marine blocks”
jtrspecialties.com/capabilities/cylinder-honing/
Industries · General industrial
“Industrial Equipment”
jtrspecialties.com/capabilities/surface-grinding/