10B21 carbon steel screws factory
XZ Fastener manufactures 10B21 carbon steel screws for buyers who need reliable cold forming, thread rolling, case hardening, and surface finish control in bulk industrial orders. 10B21 is a boron-treated carbon steel often selected for self-tapping screws, machine screws, SEMS screws, and special screws that require better hardenability than ordinary low carbon steel. Products can be supplied according to DIN, ISO, ANSI, JIS, GB, or buyer drawings. Purchasing teams can review related fastener products before sending a size list, finish, quantity, packaging, and inspection requirements for factory quotation.
Quick Specs
What Buyers Should Know Before Sourcing 10B21 Carbon Steel Screws
10B21 screws are commonly requested when a buyer needs stronger thread-forming or self-tapping performance than ordinary low carbon steel can provide. Before sourcing, confirm the screw type, head style, drive recess, thread form, point style, heat treatment, hardness range, finish, salt spray requirement, and packing method.
For special heads, non-standard points, washer assemblies, shoulder sections, under-head serrations, or controlled recess depth, XZ Fastener can review custom fasteners according to drawings, samples, or clear dimensional specifications.
Common Purchasing Descriptions
Many buyers combine screw orders with related bolt items for one project package, including DIN 933 full thread hex bolts, Grade 8.8 carbon steel hex bolts, metric hex head bolts, zinc plated DIN 933 bolts, black oxide DIN 933 bolts, and hot dip galvanized DIN 933 bolts.
- 10B21 carbon steel self-tapping screws, case hardened, zinc plated finish.
- 10B21 pan head machine screws with Phillips or Pozi drive, supplied by factory batch.
- Carbon steel SEMS screws with captive washer, packed by size and item code.
- 10B21 countersunk screws for metal assembly, black oxide or zinc plated finish.
- Thread forming screws with specified hardness range and coating thickness.
- Drawing-based 10B21 screws with special point, recess, head marking, or packing label.
Machine Screw Style Reference
When checking head style and collar design, buyers can compare dimensions with XZ Fastener’s machine screw product example, then send their required carbon steel material, finish, hardness, and packing details for factory review.
Detailed Specifications Table
| Item | Available Options | Factory Notes for Buyers |
|---|---|---|
| Product Type | Machine screws, self-tapping screws, thread forming screws, SEMS screws, countersunk screws, pan head screws, special screws | Provide the screw function and mating material so the thread and point can be reviewed. |
| Material | 10B21 carbon steel, boron-treated steel, alternative carbon steel grades available upon request | Material equivalence should be confirmed by chemical composition and mechanical requirement. |
| Standard | DIN, ISO, ANSI, JIS, GB, or buyer drawing | State the standard revision when the project specification controls it. |
| Head Style | Pan, flat, countersunk, truss, wafer, hex washer, flange, collar, and custom heads | Head diameter, height, recess depth, and under-head geometry should be defined. |
| Drive | Phillips, Pozi, slotted, hex socket, Torx, combination drive, and special recess | Drive gauge or bit fit requirement should be confirmed for automated assembly. |
| Thread and Point | Metric machine thread, tapping thread, thread forming profile, Type A, AB, B, blunt, drill point | Point style should match the mating sheet, pilot hole, or plastic component. |
| Heat Treatment | Case hardening, carbonitriding, tempering, or hardness range according to order requirement | Surface hardness, core hardness, and case depth should be specified when critical. |
| Surface Finish | Zinc plated, black oxide, phosphate, nickel plated, zinc nickel, plain oil, mechanical plating | Finish should match corrosion, torque, appearance, and assembly requirements. |
| Inspection | Dimension, thread, drive fit, hardness, case depth, coating thickness, salt spray, visual check | Inspection reports or third-party checks should be confirmed before order placement. |
| Packing | Bulk cartons, small boxes, poly bags, pallets, item labels, mixed-size packing | Provide carton weight, label format, barcode, and pallet requirement if needed. |
Material and Grade Explanation
10B21 is a boron-treated carbon steel often used for screws that need case hardening and better hardenability than common low carbon steel. The material can support forming, thread rolling, and heat treatment for self-tapping and thread-forming applications when the process is properly controlled.
Buyers should not assume every carbon steel screw grade is interchangeable. If the order requires 10B21, provide the material standard, hardness range, case depth, tensile or torsion requirement, and any restrictions on alternative grades.
Surface Finish Selection Guide
- Zinc plated: common for general assembly screws requiring clean appearance and moderate corrosion resistance.
- Black oxide: suitable for indoor machinery screws where dark appearance and oil protection are acceptable.
- Phosphate: often selected for oil retention, controlled friction, or paint adhesion needs.
- Nickel plated: used when appearance and surface cleanliness are important for visible parts.
- Zinc nickel: considered when higher corrosion performance is required for automotive or equipment applications.
- Plain oil: used for short-term protection or parts that will receive further processing after delivery.
Manufacturing and Quality Control
Production Review
Factory production planning covers wire material confirmation, heading, recess forming, thread rolling, point forming, heat treatment, surface finishing, inspection, batch separation, and packing. For 10B21 screws, forming quality and heat treatment control are important because they affect drive strength, thread performance, and assembly reliability.
For material traceability and stable forming performance, buyers can discuss raw material inspection, wire diameter checks, and batch documentation before production starts.
Inspection Points
Common checks include head dimensions, recess depth, drive fit, thread gauge, point geometry, hardness, case depth, coating thickness, salt spray when required, surface appearance, quantity, packing label, and carton weight.
For a clearer view of process checks, review XZ Fastener’s article about manufacturing quality control.
Applications
Sheet Metal Assembly
Used for tapping and thread-forming applications in brackets, panels, housings, and equipment covers.
Appliance Production
Suitable for high-volume assembly lines that require stable drive fit and consistent plating appearance.
Automotive Components
Applied in brackets, interior parts, electrical modules, and hardware assemblies where coating and hardness are controlled.
Electrical Cabinets
Used for panels, rails, boxes, and enclosure assembly with zinc plated or black finish options.
Furniture Hardware
Supplied for hinges, brackets, metal frames, and hardware kits requiring clean packing and item labels.
Industrial Maintenance
Used for repair stock, mixed-size screw kits, and replacement parts for machinery and plant maintenance.
How to Get a Faster Quotation
A complete inquiry helps the factory check material, tooling, heat treatment, finish, inspection, packing, and delivery details without repeated clarification. For 10B21 carbon steel screws, head style, drive, point, hardness, and finish should be clearly listed.
- Send size list with diameter, length, thread type, head style, drive, and point style.
- Confirm material grade, heat treatment, surface hardness, core hardness, and case depth if required.
- Attach drawings for special heads, non-standard recess, SEMS assemblies, or controlled tolerances.
- State finish, salt spray requirement, quantity, packaging method, label format, and destination.
- List inspection requirements, reports, or third-party checking before quotation.
Factory Packing and Delivery Planning
Bulk screw orders may require small boxes, poly bags, carton labels, barcode labels, item-code labels, or mixed-size packing. Buyers should confirm carton weight limits, pallet rules, shipping marks, and whether each finish or size must be packed separately.
For automated assembly, send the bit type, drive fit requirement, mating material, pilot hole size, and torque condition. These details help the factory review whether the screw point, thread profile, heat treatment, and finish are suitable for the application.
FAQ
Can XZ Fastener manufacture 10B21 carbon steel screws according to drawings?
Yes. Drawing-based 10B21 screws can be reviewed according to order requirement. Please provide dimensions, head style, drive, thread, point, material, heat treatment, finish, quantity, and inspection requirements.
Why is 10B21 used for self-tapping or thread-forming screws?
10B21 is often selected because the boron-treated carbon steel can provide better hardenability after heat treatment than ordinary low carbon steel, which helps support tapping and thread-forming performance.
Can 10B21 screws be supplied with zinc plating and salt spray requirements?
Yes. Zinc plating and other finishes can be discussed with coating thickness and salt spray requirements. Buyers should state the expected corrosion test hours and inspection method before production.
What hardness information should be provided for 10B21 screws?
For heat treated screws, provide surface hardness, core hardness, case depth, torsion requirement, or the applicable standard. These details help control screw performance and reduce assembly risk.
Can SEMS screws be made from 10B21 carbon steel?
SEMS screws with captive washers can be reviewed according to washer type, screw dimensions, assembly method, finish, and packing requirement. Drawings or samples are helpful for accurate confirmation.
What information is needed for a factory quotation?
Please send screw type, size list, head style, drive, thread, point, material, heat treatment, finish, quantity, packaging, inspection requirements, and delivery destination.
Send Your 10B21 Carbon Steel Screw Inquiry
For a faster quotation, send your size list, finish, quantity, packaging, and inspection requirements. Drawings, samples, head style, drive type, point style, hardness requirement, label details, and destination help the factory confirm production more accurately. To submit files and purchasing details, contact XZ Fastener.
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