Precision Ball & Steel Media Glossary
A plain-language reference to the materials, grades, tolerances, processes and industry terms used across precision balls, semi-precision balls, drilled balls and steel finishing media. Use the A–Z index to jump to a term, or browse by category in the sidebar.
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A
ABCUT™ Media
Abbott Ball’s proprietary line of cut-wire steel finishing media, engineered for consistent shape and edge geometry. Used in vibratory and tumble finishing to deburr, radius and polish parts before assembly or coating.
Aerospace-Grade Ball
A precision ball manufactured and inspected to the tight dimensional tolerances and material certifications required for flight-critical bearing, valve and actuation applications.
Related: Aerospace Industry Quality Documentation
Alloy
A metal made by combining two or more elements – for example, chromium and carbon added to iron to produce stainless or tool steel – to achieve properties like added hardness, strength or corrosion resistance that the base metal alone doesn’t have.
B
Ball Bearing
A rolling-element bearing that uses precision balls between inner and outer races to reduce friction between rotating parts. Ball grade, hardness and roundness directly affect bearing life and noise.
Ball Grade
An industry standard (per ABMA/ISO) describing how closely a ball’s diameter and roundness are controlled. Common grades include 3, 5, 10, 25, 100, 200, 500 and 1000 – the lower the grade number, the tighter the tolerance and the higher the precision.
Ball Valve
A shut-off valve that uses a precision ball with a bored hole to control flow – quarter-turning the ball aligns or blocks the hole against the flow path. Ball hardness, finish and roundness affect seal life and leak-tightness.
Blind Shipping
A fulfillment service where products are shipped to your customer without any reference to the original manufacturer or supplier on the packaging or paperwork, so your company remains the visible source.
C
Carbon Steel Ball
A ball made from unalloyed (or lightly alloyed) steel, valued for strength and low cost where corrosion resistance isn’t required, such as in some bearing, automotive and industrial applications.
Certificate of Conformance (C of C)
A document confirming that a batch of balls or media meets the material, dimensional and process specifications called out on the purchase order – often required for aerospace, medical and defense procurement.
Chrome Steel Ball
A high-carbon chromium alloy steel ball (typically AISI 52100), known for high hardness and wear resistance. The most common material used in standard-duty ball bearings.
Corrosion Resistance
A material’s ability to withstand oxidation and chemical attack from moisture, acids or other environments. Rated qualitatively (fair, good, excellent) on Abbott Ball material spec sheets, and a key factor when choosing between carbon steel, stainless steel or exotic alloys.
D
DFARS Compliance
Defense Federal Acquisition Regulation Supplement compliance, meaning raw material is melted and manufactured in the U.S. or a qualifying country, as required for many military and defense contracts.
Drilled Ball
A precision or semi-precision ball with one or more holes drilled through it, used in applications like check valves, pen tips, roller assemblies or as a mounting/pivot point where a through-hole is needed.
F
Fastener Ball
A ball used as, or within, a fastening or locking mechanism – for example spring-loaded ball detents, ball-lock pins and quick-disconnect couplings – where the ball provides a removable mechanical lock.
G
Grinding Media
H
Hardness (Rockwell C / HRC)
A measure of how resistant a material is to indentation, tested on the Rockwell C scale for hardened steels. Listed as a minimum value (e.g. “RC-58 MIN.”) on material spec sheets – higher HRC generally means better wear resistance but lower toughness.
Heat Treatment
A controlled heating-and-cooling process (such as hardening or tempering) applied to steel balls to achieve the target hardness, strength and dimensional stability specified for the application.
I
IATF 16949:2016
An automotive-industry quality management system standard built on ISO 9001, focused on defect prevention and reducing variation and waste in the supply chain. Abbott Ball is certified to this standard.
Inventory Management (VMI)
A service where Abbott Ball manages stocking levels of your ball or media order on your behalf, releasing product on a scheduled or as-needed basis so you avoid tying up capital in bulk inventory.
ISO 14001:2015
An international standard for environmental management systems, certifying that a manufacturer has processes in place to control and continually reduce its environmental impact.
L
Lapping
A precision finishing step where balls are run between abrasive-charged plates to remove tiny amounts of material, correcting roundness and achieving final size and surface finish to grade.
Locking Mechanism Ball
A ball used inside a mechanical lock or detent – commonly spring-loaded – to hold two components together until intentionally released, as seen in quick-disconnect couplings and ball-lock pins.
M
Magnetic Permeability
Whether a ball material is attracted to a magnet. Martensitic stainless grades (like 440C or 420) are magnetic, while austenitic grades (like 304 or 316) are generally non-magnetic – an important distinction for sensor and electronics applications.
Modulus of Elasticity
A measure of a material’s stiffness – how much it deforms under load before returning to shape. Listed in PSI on material spec sheets and used by engineers to predict ball behavior under compressive load.
N
Nitinol
A nickel-titanium alloy prized for shape-memory and superelastic properties, used in specialty medical and aerospace ball applications where flexibility and biocompatibility matter.
P
Polishing
A finishing process that produces a smooth, reflective ball surface, reducing friction and improving corrosion resistance and cosmetic appearance.
Precision Ball
A ball manufactured to tight, industry-graded tolerances for diameter, roundness and surface finish (typically Grade 100 or tighter), used where consistent performance is critical – bearings, valves, medical devices and instrumentation.
Q
Quality Documentation
Traceability paperwork – material certs, inspection reports, certificates of conformance – provided alongside an order to verify the product meets specification.
Quality Inspection
In-process and final checks – dimensional, hardness, surface and visual – performed to confirm balls meet the ordered grade and tolerance before shipment.
Quick-Disconnect Coupling
A fitting that lets hoses or lines be connected and disconnected quickly without tools, often using spring-loaded locking balls to secure the connection under pressure.
R
Rock Bit Tool Steel
An extremely hard, wear-resistant tool steel used for balls in oilfield drill-bit bearings and other high-load, high-abrasion downhole applications.
S
Semi-Precision Ball
A ball manufactured to looser dimensional tolerances than a precision ball, suited to applications like ball valves, castors, spray nozzles and toys where extremely tight roundness isn’t required – offering a lower-cost alternative.
Special Packaging
Custom packaging (bulk, counted, bagged, boxed, taped-and-sealed, etc.) configured to match your production line, shipping method or downstream automation needs.
Sphericity
How closely a ball’s shape matches a true sphere, measured as the difference between its maximum and minimum diameter. Tighter sphericity is required at higher ball grades.
Stainless Steel Ball
A ball made from a chromium-alloyed steel that resists rust and corrosion. Common grades include 302, 304, 316, 316L, 420, 430 and 440C, each balancing hardness, corrosion resistance and magnetism differently for the application.
Steel Finishing Media
Small shaped steel pieces (balls, pins, cones, etc.) tumbled or vibrated with parts to deburr, deflash, radius edges, clean or burnish surfaces before finishing or assembly.
Surface Finish (Ra)
A measurement of surface roughness, expressed as Ra (average roughness). A lower Ra means a smoother ball surface – important for reducing friction and wear in bearing and sealing applications.
T
Tantalum Ball
A ball made from tantalum, a dense, highly corrosion-resistant, biocompatible metal used in specialty medical implant and chemical-processing applications.
Tensile Strength
The maximum stress a material can withstand while being stretched before breaking, listed in PSI on material spec sheets – a key indicator of overall material strength.
Testing Lab
Abbott Ball’s in-house metallurgical and dimensional testing capability, used to verify hardness, composition, roundness and other specifications on incoming material and finished parts.
Titanium Ball
A lightweight, high-strength, highly corrosion-resistant and biocompatible ball material, common in aerospace, medical implant and marine applications.
Tolerance Grade
See Ball Grade.
Tungsten Carbide Ball
An extremely hard, wear- and corrosion-resistant ball used in high-load valve seats, flow meters and downhole tools where standard steel would wear too quickly.