Socket Head Captive Screw & Socket Head Lag Screw | Wholesale
Premium Socket Head Captive Screw & Socket Head Lag Screw โ Factory-Direct Wholesale
โ๏ธ Eliminate fastener loss, reduce assembly downtime, and secure your supply chain with cost-effective, high-strength socket head captive screws and lag screws.
Engineered for automotive, construction, and agricultural machinery โ backed by 15+ years of export expertise.
๐ฅ Get Free Quote in 24hโ Free samples available โ ISO 9001 & CE certified โ 30+ countries served
๐ฉ The True Cost of Cheap Fasteners
If youโre sourcing socket head captive screws or socket head lag screws purely on price, youโre likely facing these six pain points:
Cheap screws strip, shear, or loosen under vibration โ costing 3ร the part price in rework and downtime.
Mixed batches, wrong thread pitch, or missing plating โ your assembly line stops.
Split shipments, port delays, and minimum order quantities that donโt match your demand.
A poorly designed captive feature means lost screws in sensitive assemblies โ safety risk + rework.
No CE, RoHS, or ISO documentation โ your quality audit fails.
Supplier ghosts you when a batch defect appears. No replacement, no accountability.
โ Why Boen Fasteners โ Your Trusted Wholesale Partner
We donโt just sell socket head captive screws and socket head lag screws โ we engineer reliability into every thread. Hereโs how we solve your pain points:
Powerful Factory
10,000+ mยฒ facility, 80+ precision machines, 15+ years of export experience. Annual output 50,000+ tons.
Quality Assurance
ISO 9001, CE, RoHS, FCC, and UL-certified. 100% dimensional inspection before shipment. 0.2% defect rate.
High-Speed Delivery
Standard lead time 15โ25 days. Express stock ship in 7 days. FOB/CIF/DDP terms available.
OEM/ODM Design
Custom head markings, captive retention features, thread forms, and platings. Free design review.
Factory-Direct Value
Eliminate middlemen. Save 20โ35% vs. distributor pricing. Transparent cost breakdown on every PO.
One-Stop Service
From material selection to logistics tracking โ dedicated account manager. ERP integration ready.
๐ Technical Specifications โ Socket Head Captive Screw & Socket Head Lag Screw
Our socket head captive screw and socket head lag screw families meet ASTM, DIN, ISO, and GB standards. Below are the most popular configurations:
| Parameter | Socket Head Captive Screw | Socket Head Lag Screw |
|---|---|---|
| Thread Size | M3 โ M20 (ISO metric) | #4 โ 3/4" (UNC/UNF) | M6 โ M24 (ISO metric) | 1/4" โ 1" (UNC) |
| Length Range | 6 mm โ 120 mm (custom up to 200 mm) | 20 mm โ 300 mm (custom up to 500 mm) |
| Material Grades | Carbon steel 8.8/10.9/12.9 | Stainless steel A2-70/A4-80 | Brass | Alloy steel | Carbon steel 4.8/8.8 | Stainless steel A2-70 | Hardened alloy steel |
| Plating / Coating | Zinc (clear/yellow/blue), black oxide, Dacromet, hot-dip galvanized, passivated | Zinc, hot-dip galvanized, black phosphate, Geomet, Sherardized |
| Drive Type | Hex socket (ISO 4762), Torx, Phillips, slotted | Hex socket, external hex, Torx, square drive |
| Retention Feature | Captive washer / spring clip โ prevents screw loss | N/A (self-tapping thread for wood/plastic) |
| Standards Met | DIN 912, ISO 4762, ASME B18.3, GB/T 70.1 | DIN 571, ISO 4018, ASME B18.2.1, GB/T 102 |
| Typical Hardness (HRC) | 22โ32 (grade 8.8) | 32โ39 (grade 10.9) | 39โ44 (grade 12.9) | 18โ25 (grade 4.8) | 25โ32 (grade 8.8) |
| Packaging Options | Bulk cartons (25 kg), poly bags with label, OEM box, palletized | Bulk cartons, shrink-wrapped bundles, wooden crates (for long lengths) |
๐ก Application Note: Use socket head captive screws in electronics enclosures, panel assemblies, and aerospace access panels where screw retention is critical. Use socket head lag screws for heavy timber construction, deck framing, and agricultural equipment mounting.
โ Frequently Asked Questions
Q1: What is a socket head captive screw, and how does it differ from a standard socket head screw?
A socket head captive screw has a built-in retention feature (usually a captive washer or spring-loaded clip) that prevents the screw from falling out when fully loosened. This is critical for panels, doors, and enclosures where screw loss would cause safety or operational issues. A standard socket head screw has no such retention feature.
Q2: What grades of socket head lag screw are best for heavy timber construction?
For heavy timber, we recommend grade 8.8 carbon steel socket head lag screws with hot-dip galvanized coating (minimum 55 ยตm). For outdoor or marine environments, use stainless steel A4-80 lag screws. All our socket head lag screws meet DIN 571 and ASTM A307 standards.
Q3: Do you offer custom OEM/ODM socket head captive screws with specific head markings?
Yes. We provide full OEM/ODM service โ including custom head logos, captive retention design, thread pitch modifications, and special platings. MOQ for custom socket head captive screws is 5,000 pcs per size. Free design review within 48 hours.
Q4: What are your typical wholesale lead times and shipping terms for socket head lag screws?
Standard production lead time is 15โ25 working days for bulk orders. Express stock items ship in 7 days. We offer FOB, CIF, CFR, and DDP terms. Shipping via sea (LCL/FCL), air, or express (DHL, FedEx, UPS). We provide a full freight calculator before you order.
Q5: How do you ensure quality control for captive screw assemblies?
Every batch of socket head captive screws undergoes: (1) dimensional inspection with CMM, (2) hardness testing (Rockwell), (3) tensile strength test, (4) plating thickness verification (XRF), and (5) captive retention force test. We provide full inspection reports with every shipment.
Q6: What payment methods do you accept for wholesale socket head screw orders?
We accept T/T (wire transfer), L/C (irrevocable), PayPal (for samples), and Alibaba Trade Assurance. For first-time buyers, we recommend 30% deposit + 70% balance against copy of B/L. Long-term partners can negotiate open account terms.
Q7: Can you provide free samples of socket head captive screws for testing?
Absolutely. We offer free samples (up to 10 pcs per size) for qualified buyers. You only pay the shipping cost. Samples are produced from the same production line as bulk orders, so you can validate quality before committing. Request samples via the form below or email us directly.
Q8: What after-sales support do you offer if a batch defect occurs?
We provide a 12-month quality guarantee on all socket head captive screws and socket head lag screws. If a batch defect is confirmed (by third-party lab), we replace the entire batch at our cost, including freight. Our after-sales team responds within 4 hours.
โญ What Our Customers Say
Construction equipment rental
โWe buy socket head lag screws in 40ft containers. Boenโs quality is consistent, and their pricing is 22% lower than our previous supplier. Lead times are reliable โ weโve saved $120k annually.โ
Automotive tier-1 supplier
โCertified ISO 9001 and IATF 16949 compliant. Their socket head captive screws passed our PPAP with zero deviation. Excellent engineering support for custom captive designs.โ
Industrial robotics manufacturer
โThe captive retention force on their screws is +40% higher than the spec we provided. Our assembly line now runs 6% faster because we no longer lose screws inside robotic arms.โ
Agricultural machinery OEM
โOne-stop service from material selection to DDP delivery. Boen handles all our socket head lag screws and socket head captive screws. Their local agent in Sรฃo Paulo ensures fast customs clearance.โ
Liang Wei โ Senior Fastener Engineer & Export Quality Lead at Handan Boen Fastener Manufacturing Co., Ltd. With 14+ years in industrial fastener design and international trade, Liang has overseen over 1,200 export shipments of socket head captive screws, socket head lag screws, and high-strength fasteners to 30+ countries. He is a certified ISO 9001 internal auditor and a member of the China Fastener Industry Association (CFIA). His articles combine deep technical knowledge with practical procurement insights.
๐ Ready to Secure Your Supply Chain?
Get factory-direct pricing on socket head captive screws and socket head lag screws.
๐ฆ Free samples | ๐ 12-month quality guarantee | โณ Limited-time: free shipping on first order over $5,000
๐ Hanguang Industrial Park, Yongnian District, Handan City, Hebei Province, China | MonโSat 09:00โ17:00
๐ Trusted by Industry Leaders Worldwide
Agricultural machinery manufacturer
โWe switched to Boen for our socket head captive screws and socket head lag screws. Their consistent quality cut our field failure rate by 73%. Lead times? 18 days from order to warehouse. Highly recommended.โ