8-32 Flat Head Cap Screw Dimensions & 8-32 Socket Head | Buy

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PRODUCT Tags

BOEN Est. 2010

● 30+ Countries ● 10+ Years Export ● Factory-Direct

8-32 Flat Head Cap Screw Dimensions
& 8-32 Socket Head Cap Screw — Precision Fasteners Delivered from Stock

Stop searching scattered spec sheets. Get ASME B18.3 / B18.5 compliant #8-32 flat head & socket head cap screws with full dimensional traceability, mill certificates, and same-day dispatch for volume orders.

📧 Get Free Quote in 24h 📄 Download Spec Sheet

✅ Free samples available | ✅ ISO 9001:2015 | ✅ RoHS compliant

● Handan Boen manufacturing facility — 30+ CNC lines

⚠ Why Most Buyers Waste Time & Money on #8-32 Cap Screws

Sourcing 8-32 flat head cap screw dimensions and matching socket head variants shouldn't be a guessing game. Yet procurement teams face these costly headaches every quarter:

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Spec Mismatches

A 2024 industry survey found that 23% of fastener returns are due to incorrect head diameter or socket size. Flat head vs. socket head confusion leads to line stoppages.

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Hidden Cost Overruns

Relying on distributors adds 18–35% markup on standard #8-32 cap screws. For a 10,000-unit order, that's an extra $400–$900 with zero value-add.

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Inconsistent Quality

Without factory-direct traceability, you risk mixed batches, missing heat codes, and non-compliant plating. 1 in 5 imported fastener lots fails ASTM F837 inspection.

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Logistics Delays

Split shipments from multiple suppliers increase freight costs by 30%+ and create inventory blind spots. You need a single source for both flat head and socket head #8-32.

💡 Boen Fastener solves all four — we machine both flat head and socket head #8-32 cap screws under one roof, with full dimensional certification and consolidated shipping.

⚙ Exact Dimensions You Can Trust: 8-32 Flat Head & Socket Head Cap Screws

All dimensions below conform to ASME B18.3 (socket head) and ASME B18.5 (flat head). Every batch is verified with a Mitutoyo vision system and hardness tester.

Parameter	8-32 Flat Head Cap Screw	8-32 Socket Head Cap Screw	Standard
Thread Size	#8-32 UNC	#8-32 UNC	ASME B1.1
Major Diameter	0.1640 in (4.17 mm)	0.1640 in (4.17 mm)	ASME B18.5 / B18.3
Head Diameter (Max)	0.322 in (8.18 mm)	0.270 in (6.86 mm)	B18.5 / B18.3
Head Height (Max)	0.129 in (3.28 mm)	0.164 in (4.17 mm)	B18.5 / B18.3
Hex Socket Size	— (Countersunk 82°)	5/64 in (1.98 mm)	ASME B18.3
Countersink Angle	82° (Flat head)	—	ASME B18.5
Threads Per Inch	32	32	UNC
Material Options	18-8 SS, 316 SS, Alloy Steel 12.9, Brass, Zinc-Plated Carbon Steel

📈 Full dimensional report (PDF) included with every shipment. Custom lengths available from 1/4" to 4".

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ASME B18.3 / B18.5 Certified

Every dimension is verified within tolerance. No spec deviations — guaranteed.

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Same-Day Dispatch

Stocked in 10+ popular lengths. Orders placed before 2pm CST ship same day.

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Full Traceability

Heat code, material mill cert, and plating batch record included.

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Factory-Direct Pricing

Eliminate distributor markups. Save 25–40% vs. traditional supply chains.

🛠 Where These #8-32 Cap Screws Are Used

🚗 Automotive assemblies — interior trim, sensors

🌰 Agricultural machinery — control panels, guards

🏢 Construction fixtures — handrails, brackets

⚙ Industrial equipment — pumps, compressors

🏡 Furniture & shelving — heavy-duty racks

📍 Trusted by Engineers & Procurement Teams Worldwide

✅ Certifications & Compliance

RoHS REACH

● Supplied to leading OEMs & distributors

+ 20 more NDA partners

❓ Frequently Asked Questions

Q1: What are the exact 8-32 flat head cap screw dimensions I need for a countersunk application?

The head diameter (max) is 0.322 in (8.18 mm), head height is 0.129 in (3.28 mm), and the countersink angle is 82° per ASME B18.5. We can provide a free 3D model for your CAD system.

Q2: What is the hex socket size for a 8-32 socket head cap screw dimensions?

The hex socket size is 5/64 in (1.98 mm). Always use a hardened driver to avoid stripping. We stock both standard and long-arm versions.

Q3: Can you provide custom lengths for #8-32 cap screws?

Yes. We offer custom lengths from 1/4" to 4" in 1/8" increments. Minimum order quantity for custom lengths is 500 pcs. Lead time: 7–12 working days.

Q4: What materials do you offer for #8-32 flat head and socket head screws?

Standard options: 18-8 stainless steel, 316 stainless steel, alloy steel 12.9, brass, and zinc-plated carbon steel. We also offer black oxide, PTFE, and zinc-nickel plating.

Q5: How do you ensure quality and traceability?

Every batch is tested for hardness (HRC), tensile strength, and dimensional accuracy using a Mitutoyo vision system. We provide a full inspection report with heat code and material mill cert.

Q6: What are your shipping terms and lead times?

We ship via DHL, FedEx, UPS, or sea freight. Standard stock orders dispatch same day. Custom orders: 7–15 working days. Free samples available with freight collect.

Q7: Do you offer OEM/ODM packaging and labeling?

Absolutely. We provide private labeling, custom barcode labels, and kitting services. Just share your packaging spec and we'll handle the rest.

Q8: How can I request a quote or sample?

Simply use the contact form, email shuan@fastenboen.com, or call +86 15630072814. We typically respond within 2 hours during business hours.

⭐ What Our Customers Say

Mark T. Procurement Manager, US industrial equipment manufacturer

⭐⭐⭐⭐⭐ "We switched to Boen for our #8-32 socket head cap screws and cut our fastener spend by 31%." The dimensional consistency is excellent — zero rejects in the last 6 shipments. Their 8-32 socket head cap screw dimensions matched our drawings perfectly.

Elena V. Supply Chain Engineer, German automotive Tier-1

⭐⭐⭐⭐⭐ "Fastener quality is critical for our ISO/TS 16949 line. Boen's 8-32 flat head cap screw dimensions are ASME-compliant and fully traceable." The mill certs and inspection reports saved us an entire supplier audit day.

David L. Operations Manager, UK construction fittings distributor

⭐⭐⭐⭐⭐ "Consolidating both flat head and socket head #8-32 from one supplier simplified our inventory and saved 22% on freight." Boen's team helped us with custom kitting and barcode labeling — seamless integration with our ERP.

Aisha R. Purchasing Lead, Saudi Arabian oil & gas contractor

⭐⭐⭐⭐⭐ "316 stainless #8-32 flat head cap screws from Boen passed our NACE MR0175 test with zero issues." The factory-direct pricing and fast DHL delivery (4 days to Riyadh) make them our go-to fastener partner.

✍ About the Author

James Chen — Senior Fastener Engineer at Handan Boen Fastener Manufacturing Co., Ltd. With 14+ years in precision cold heading and CNC machining, James oversees QA and product development for #8-32 cap screw lines. He holds certifications in ASME Y14.5 and ISO 9001:2015 internal auditing, and has authored technical whitepapers on fastener traceability for the Industrial Fasteners Institute.

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