Product Description
High-precision sealed bearing assembly suitable for manual pallet jack wheel and load support applications, constructed from SAE 52100 hardened bearing steel, ABEC 1 precision, equipped with double-sided contact seals. Bore diameter: 20 mm, outside diameter: 47 mm, width: 14 mm. Designed for press-fit installation in standard wheel hubs.
Specifications
Material
| Steel Grade | SAE 52100 bearing steel |
| Hardness | Rockwell C62 (ring and balls) |
Frequently Asked Questions
Q: What are the exact dimensions and specifications for bearing SKU 21021?
A: SKU 21021 has a bore diameter of 20 mm, outside diameter of 47 mm, and width of 14 mm. It is constructed from SAE 52100 hardened bearing steel, rated ABEC 1 precision, with Rockwell C62 hardness on both the inner and outer rings and rolling elements. Double-sided contact seals are installed for contamination protection.
Q: What equipment is bearing 21021 compatible with?
A: This bearing fits manual pallet jack wheel and load support applications across Crown, Toyota, Raymond, Yale, and similar OEM platforms. The 20 mm bore and 47 mm outside diameter are common in mid-size pallet jack load wheels. Verify against your original bearing dimensions before ordering to ensure hub compatibility.
Q: Why is SAE 52100 bearing steel used in SKU 21021?
A: SAE 52100 is a high-carbon chromium bearing steel selected for exceptional hardness, toughness, and fatigue resistance under heavy dynamic loads. Rockwell C62 hardness provides durability in manual pallet jack load wheel service where repetitive compression and rolling forces occur constantly. This grade resists spalling and brinelling better than standard steels.
Q: What does ABEC 1 precision mean for this bearing?
A: ABEC 1 is the loosest precision tolerance grade for ball bearings. It allows slightly more radial and axial play than higher grades. ABEC 1 is appropriate for manual pallet jack wheel applications because load wheels do not require precision rotation or tight tolerances. The cost is lower than ABEC 3 or higher grades, and durability is equivalent for material handling equipment.
Q: How do double-sided contact seals affect bearing performance in SKU 21021?
A: Double-sided contact seals protect bearing internals from water, dirt, and debris on both sides of the bearing, extending lifespan in wet or dirty warehouse environments. These seals create minimal friction loss compared to open bearings. The seal material is designed to remain flexible across temperature ranges typical in cold storage and dock operations.
Q: What is the expected service life of bearing 21021 under typical pallet jack use?
A: In standard indoor warehouse service with normal loads and moderate use (4-8 hours daily), SKU 21021 typically provides 4-7 years of operation. Heavy duty use, wet conditions, and lack of lubrication reduce lifespan. Double-sided seals maintain bearing function longer in wet or cold storage environments compared to single-shield bearings.
