A professional-grade 28 mm shaft barbell engineered specifically for snatch, clean and jerk, pulls, and dynamic weightlifting complexes. Designed for commercial equipment buyers, wholesalers, global distributors, and private-label brands, this product focuses on verifiable, manufacturing-level technical parameters and ISO-certified production standards.
Technical Specifications
|
Specification |
Parameter / Standard |
|
Product Type |
Olympic Weightlifting Bar |
|
Primary Applications |
Snatch, Clean and Jerk, Dynamic Pulls, Olympic Lifting |
|
Shaft Diameter |
28 mm (+/- 0.05 mm) |
|
Bar Weight Tolerance |
20 kg +/- 0.5% (44.09 lbs) |
|
Tensile Strength |
190,000 PSI - 215,000 PSI |
|
Yield Strength |
Min. 170,000 PSI |
|
Shaft Hardness |
42 - 46 HRC |
|
Straightness Tolerance |
<= 0.20 mm over total shaft length |
|
Shaft Finish |
Hard Chrome Coating (15 - 25 um thickness) |
|
Knurl Type |
IWF-Standard Weightlifting Diamond Knurl (Depth: 0.25 - 0.35 mm) |
|
Rotation Mechanism |
High-Precision Needle Bearings + Bronze Bushings (4 to 10 bearings) |
|
Axial Play Tolerance |
0.2 - 0.5 mm |
|
Quality Certifications |
ISO9001 Factory Audit, SGS Material & Load Test Reports |
Engineering & Manufacturing Highlights
Shaft Metallurgy & Elasticity: Crafted from high-tensile alloy steel (42CrMo / 20Mn2). The 28 mm diameter coupled with controlled heat treatment provides optimal elasticity ("whip") for dynamic movements while preventing permanent bending under heavy drop loads.
Controlled Knurling: Fine diamond knurl profile provides dynamic grip without excessive hand abrasion. Includes standard Olympic markings (810 mm spacing) with clean, burr-free CNC-machined transitions.
Smooth Sleeve Rotation: Precision bearing housings minimize shaft clatter and reduce radial/axial slop, protecting athlete joints during explosive turnovers.
Corrosion Resistance: Industrial hard chrome finish undergoes up to 72-Hour Neutral Salt Spray (NSS) testing to ensure sweat and rust protection in heavy commercial environments.
Barbell Feature Comparison
|
Feature |
28mm Weightlifting Bar |
General-Purpose Bar |
Powerlifting Bar |
|
Primary Focus |
Snatch, Clean & Jerk |
Commercial Gym / General |
Squat, Bench, Deadlift |
|
Shaft Diameter |
28 mm |
28.5 mm - 29 mm |
29 mm - 32 mm |
|
Shaft Whip |
High Dynamic Whip |
Balanced / Moderate |
Stiff / Minimal Flex |
|
Rotation System |
High-Precision Bearings |
Bushing / Hybrid |
Heavy Duty Bushings |
|
Knurl Profile |
Medium Diamond |
Mild to Medium |
Aggressive / Sharp |
Quality Assurance & OEM Services
B2B Quality Control Process:
Raw Material Audit: Chemical analysis and tensile strength testing (Mill Test Certificate provided).
In-Process Checks: CNC machining tolerance, shaft straightness gauge checks, and knurl depth verification.
Assembly & Final QC: Sleeve spin smoothness, drop test validation, and hard chrome adhesion testing.
Customization Options:
Branding: Laser-etched shaft logos, custom silicone sleeve bands, custom end-cap graphics.
Customization: Tailored knurl depth, center knurl options, alternate finishes (Cerakote / Black Zinc).
Export Packaging: Poly-bagged shafts, moisture-proof heavy-duty cardboard tubes, and ISPM 15 certified wooden pallets.
FAQ
Q: Why choose a 28 mm shaft over a 28.5 mm or 29 mm bar for Olympic lifting?
A: The 28 mm shaft provides a slightly slimmer grip profile that optimizes hook-grip comfort and offers higher shaft flex ("whip"), which is essential for rapid turnover during snatches and cleans.
Q: What quality control documentation do you provide for wholesale orders?
A: We provide complete technical documentation including Product Datasheets, 2D/3D CAD Drawings, Mill Test Certificates (MTC), ISO9001 Factory Audit Reports, and Final QC Inspection Reports prior to dispatch.
Q: What bearing configurations are available for OEM production?
A: We offer customization options ranging from 4 to 10 precision needle bearings combined with self-lubricating bronze bushings, depending on your dynamic spin and durability requirements.
Q: How do you guarantee straightness across mass production shipments?
A: Shaft straightness is inspected and corrected at three separate manufacturing stages: post-machining, post-heat treatment, and final assembly, ensuring every bar stays within the <= 0.20 mm tolerance.
Q: What are your OEM branding and export packaging options?
A: We offer end-to-end branding (laser engraving, custom end-caps, custom carton labeling) and ship all bars in thick, moisture-proof individual cardboard tubes designed for long-distance ocean freight.
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