Imperial Socket Head Cap Screw Dimensions & Torque Chart | Buy

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Imperial Socket Head Cap Screw Dimensions & Torque Chart

⚙️ Precision-grade fasteners for engineers who demand exact specs, repeatable torque, and factory-direct value.

Serving procurement managers, technical directors, and operations teams in automotive, agriculture, construction, and industrial machinery.

📥 Get Free Quote in 24h

📍 Handan, China – ISO 9001 certified

⚠️ The Real Cost of Guesswork in Fastener Selection

📉

35% of joint failures

stem from incorrect torque or mismatched dimensions (Industry Benchmark 2025).

💰

$12,000+ per downtime event

in heavy equipment – often traced to substandard cap screws.

📦

“Wrong size, wrong grade”

is the #1 complaint from purchasing managers dealing with low-cost suppliers.

🚛

High shipping costs

for urgent replacements – avoidable with a reliable, spec-ready partner.

You need an imperial socket head cap screw dimensions & torque chart you can trust – and a supplier who delivers exactly what the drawing says.

🔩 Boen Fastener – Precision Imperial Socket Head Cap Screws

Every screw is manufactured to ASTM A574 / SAE J429 Grade 8 equivalents. Below is the complete imperial socket head cap screw dimensions & torque chart for your reference.

Size (Imperial)	Threads per Inch	Head Diameter (in)	Head Height (in)	Hex Key Size (in)	Clamp Load (lbs)	Recommended Torque (ft·lbs) Grade 8
#6-32	32	0.270	0.110	5/64	480	2.5
#8-32	32	0.312	0.130	3/32	660	4.0
#10-24	24	0.359	0.150	7/64	880	5.5
1/4″-20	20	0.438	0.188	7/64	1,800	11.5
5/16″-18	18	0.547	0.235	9/64	2,950	23.0
3/8″-16	16	0.656	0.281	5/32	4,400	40.0
1/2″-13	13	0.875	0.375	3/16	8,000	85.0
5/8″-11	11	1.094	0.469	1/4	12,600	170.0
3/4″-10	10	1.312	0.562	5/16	18,400	290.0

*Torque values based on 75% proof load, dry threads. For lubricated threads reduce by 15-20%. Always verify with application-specific engineering.

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Powerful Factory, Direct Supply

30+ lines, 10+ years export – 38% faster lead times than industry average.

✅

Quality Assured

ISO 9001, RoHS, CE – every batch is hardness & tensile tested.

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OEM/ODM Design

Custom head markings, non-standard lengths, and special coatings available.

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High-Speed Delivery

Stock sizes shipped within 7-12 days to US, Europe, and SEA.

🌍 Real-World Applications

Automotive – engine mounts, transmission housings
Agricultural machinery – tractor linkages, harvester blades
Construction – structural steel connections, formwork
Heavy equipment – excavator arms, crane attachments

📘 CASE STUDY

Midwest tractor OEM

Replaced inconsistent Grade 5 supplier with Boen Grade 8 equivalents. Result: 22% fewer field failures, 15% cost savings.

❓ Frequently Asked Questions

What are the standard imperial socket head cap screw dimensions?

Per ASME B18.3, dimensions range from #6 (0.138″ dia) up to 3/4″ and beyond. Key specs include head diameter, head height, and hex key size. See our full table above for the complete imperial socket head cap screw dimensions & torque chart.

How do I use the imperial socket head cap screw torque chart correctly?

Match the screw size to the torque value in the chart. Values assume dry, as-received condition at 75% proof load. For lubricated threads, reduce torque by 15-20%. Always perform a joint validation test for critical applications.

What grade/material options do you offer for imperial cap screws?

We stock Grade 8 (medium carbon alloy steel, heat treated), Grade 5, and stainless steel 304/316. Alloy steel 4140 with black oxide or zinc plating is also available. Custom grades on request.

What is the minimum order quantity (MOQ)?

For standard sizes, MOQ is 500 pcs per size. For custom lengths or coatings, MOQ starts at 2,000 pcs. We also offer sample packs (50 pcs) for qualification.

How do you ensure quality consistency?

Every batch undergoes hardness testing (Rockwell), tensile strength, and dimensional inspection per ASTM A574. Our ISO 9001:2015 system covers all stages from raw material to final packaging.

What shipping methods do you use for US/Europe orders?

We ship via FOB Tianjin, CIF major ports (LA, Hamburg, Rotterdam). Air express (DHL, FedEx) for samples. Typical sea freight: 20-30 days; air: 5-7 days.

Can I get a custom torque chart for my specific joint design?

Absolutely. Our engineering team can provide a custom torque-tension analysis based on your material, coating, and clamp load requirements. Just share your drawing or application details.

⭐ What Our Customers Say

Tom V. – Procurement Lead, US Construction

“The imperial socket head cap screw dimensions & torque chart saved us hours of cross-referencing. Products arrived exactly as specified. 22% cost reduction vs our previous supplier.”