68cal. 50cal ABS Coated Steel Balls: The Only Factory Built to Make Coated steel balls.
While the market chases volume, Ningyang Xinxin Stainless Steel Ball Manufacture Co.,Ltd has spent 25 years perfecting a single product family - precision ABS coated steel balls in 0.68″ and 0.50″ calibers - from raw steel to sealed carton, all under one roof.
Kaifeng, China - September 12, 2026 - Photograph a pallet of 68cal. ABS coated steel balls and a pallet of 50cal. ABS coated steel balls from ten different suppliers, and you will get ten nearly identical pictures. Measure them, shoot them, and drop them, and you will get ten different products.
That gap between looking right and performing right is the whole reason Ningyang Xinxin Stainless Steel Ball Manufacture Co.,Ltd exists - and the reason we state it plainly: we are the only factory in the world dedicated exclusively to the professional production of plastic coated steel balls.
A Coated Ball Is a System, Not a Component
The phrase "ABS coated steel ball" hides three completely different manufacturing disciplines:
Steel ball production - heading, heat treatment, grinding, lapping and grading to a controlled diameter and sphericity.
Polymer compounding - ABS grade selection, moisture control, melt flow index, impact modifiers and colour masterbatch.
Precision coating - bonding the polymer shell to a steel sphere with no seam, no parting line, no sink marks and no wall-thickness variation.
Most suppliers master one of the three. A bearing ball factory buys its coating from a molder. A plastics molder buys its balls from a trading company. The steel never meets the polymer until the very last step - and the buyer inherits the mismatch. Off-centre cores, thin walls on one side and thick on the other, coating that delaminates after a season in the field.
[COMPANY] does all three, in sequence, in one plant, under one quality system.
Why 0.68″ and 0.50″ Cannot Share a Process Window
A 0.68 inch ball (17.27 mm) and a 0.50 inch ball (12.70 mm) look like a size difference. On the shop floor they are two different physics problems:
Surface-to-volume ratio. The smaller 0.50 caliber ball presents roughly a third more surface area per unit of volume. It cools faster, shrinks faster, and pulls on the coating differently during solidification.
Fill and pack time. Cavity pressure, gate sizing and hold time that produce a flawless shell on a 17.27 mm core will produce short shots and internal voids on a 12.70 mm core.
Concentricity sensitivity. A wall-thickness deviation of 0.05 mm is a certain percentage of the total diameter - and that percentage is larger on the smaller ball. Tolerance windows simply cannot be copied across.
This is why we run separate tooling, separate process windows, separate cooling profiles and separate inspection limits for 0.68″ and 0.50″. Suppliers who "also do both" on one setting are telling you which one they are compromising.
Our Coated steel ball photos
What "Truly Professional" Means in Numbers
Every claim below is something we will let a customer verify on site, with their own gauge:
|
Verifiable capability |
Why it matters to a buyer |
|
Steel ball grinding and grading performed in-house |
No dependence on a third party's ball grade; diameter and sphericity are controlled at the source |
|
ABS compounding and drying controlled in-house |
Moisture and melt-flow stability = repeatable shell thickness, batch after batch |
|
Dedicated coating lines for 0.68″ and 0.50″ |
Each caliber runs in its own optimised process window |
|
100% diameter gauging before packing |
No sampling lottery - every ball is measured, not estimated |
|
Sphericity and wall-thickness checks per batch |
Off-centre cores are caught before shipment, not after complaints |
|
Drop and impact testing on retained samples |
Film strength and adhesion are proven, not asserted |
|
Batch traceability from steel lot to carton |
A problem can be traced to a specific lot in hours, not weeks |
|
OEM and private label from one dedicated specialist |
Your brand, your packaging, one accountable factory behind it |
Typical production targets (final values confirmed per purchase order - [confirm] each line before publishing):
|
Parameter |
0.68″ (68cal.) |
0.50″ (50cal.) |
|
Nominal diameter |
17.27 mm |
12.70 mm |
|
Diameter tolerance |
[confirm] |
[confirm] |
|
Sphericity / roundness |
[confirm] |
[confirm] |
|
Coating thickness |
[confirm] |
[confirm] |
|
Wall thickness variation |
[confirm] |
[confirm] |
|
Colour |
[confirm] - custom masterbatch available |
[confirm] |
|
Packing |
[confirm] |
[confirm] |
A Challenge, Not a Slogan
Anyone can print "the only professional manufacturer" on a website. So here is the version that can be checked: find another factory that grinds its own steel balls, compounds its own ABS, coats both 0.68″ and 0.50″ on dedicated in-house lines, gauges 100% of output, and keeps batch records from steel lot to carton.
If you find one, Ningyang Xinxin Stainless Steel Ball Manufacture Co.,Ltd would genuinely like to know them. In 25 years of doing only this, we have not met one.
FAQ
What are 68cal. and 50cal ABS coated steel balls used for?
They are precision plastic coated steel balls for training, practice, marking and recreational applications where a repeatable, dimensionally consistent ball matters more than the cheapest possible price.
Do you supply both 0.68 and 0.50 caliber from the same factory?
Yes - and they are produced on separate lines with separate tooling and separate inspection limits, not on one shared setting.
Do you offer OEM and private label?
Yes. Custom colour, custom packaging, custom carton artwork and your own brand, produced by one accountable factory rather than a trading chain.
What is your minimum order quantity?
[MOQ] per caliber and colour. Sample orders for evaluation are available on request.
Can we inspect the line before ordering?
Yes. Factory visits - physical or live video walkthrough of the grinding, compounding, coating and gauging stations - are welcome at any time. Ningyang Xinxin Stainless Steel Ball Manufacture Co.,Ltd has nothing to hide behind a trading office.
About Ningyang Xinxin Stainless Steel Ball Manufacture Co.,Ltd
Ningyang Xinxin Stainless Steel Ball Manufacture Co.,Ltd is a Kaifeng-based manufacturer of ABS coated steel balls and plastic coated steel balls in 0.68″ (68cal.) and 0.50″ (50cal.) calibers. Operating an end-to-end production line - steel ball grinding and grading, ABS compounding, precision coating, 100% diameter gauging and batch-traceable packing - the company supplies OEM and private label customers worldwide.
Media Contact
Contact: Alice
Email:info@xxballs.com
PHONE :+86 18605486984
WEBSITE:www.pomplasticball.com
