FF-S-85
Thumb Screws
Mumbai · India
Why Thumb Screws Are Their Own Fastener Class
Every other screw specification we manufacture assumes a driver, wrench, or socket will turn it. A thumb screw assumes the opposite — that a person needs to turn it repeatedly, quickly, and without reaching for a tool at all. That requirement drives the entire design: the head has to be large enough to grip firmly with bare fingers, textured or winged enough not to slip under the moderate torque a hand alone can generate, and shaped so the fastener can be captured, spun, and re-tightened dozens of times over its working life without wearing out or becoming uncomfortable to operate.
That’s a genuinely different engineering goal than any of our other screw types — a cap screw or machine screw is optimized for maximum, tool-assisted clamping force; a thumb screw is optimized for repeated, comfortable, tool-free hand operation at a clamping force well below what a wrench could deliver. Getting the head style right for the actual hand-access and frequency-of-use situation is the practical decision buyers need help with, more than any strength specification.
Akbar Fasteners Pvt. Ltd. exports to over 50 countries, and our thumb screw range is manufactured across knurled, winged, and spade head types, verified under our ISO 9001:2015 quality system.
Where FF-S-85 Genuinely Applies
Genuine Tool-Free Operation
Head geometry sized and textured for reliable hand-tightening without any driver or wrench.
Built for Repeated Use
Durable knurl or wing geometry designed to withstand frequent hand-operation without degrading.
Unambiguous Federal Specification
Removes ambiguity in federal purchase orders needing a defined thumb screw standard.
Multiple Material & Finish Options
Steel, stainless steel, and nylon options across common head styles for different environments.
Thumb Screw Head Type Options
Knurled Head Thumb Screw
Fine or coarse knurl texture around a round head, giving reliable grip in a compact profile.
Wing Head Thumb Screw
Two flared wings extending from the head, giving maximum leverage for higher hand-applied torque.
Spade Head Thumb Screw
Flattened spade-shaped head for a low-profile grip in tight-clearance panel applications.
Head Type Selection Guide
The right head type depends on the torque needed, clearance available, and how often the fastener will be operated. This table is the quick reference we use with buyers before quoting.
| Head Type | Hand Torque | Typical Use Case |
|---|---|---|
| Knurled Head | Moderate | Compact panels, general-purpose access |
| Winged Head | Highest | Higher clamping force with only hand torque |
| Spade Head | Lower to Moderate | Tight clearance, low-profile applications |
FF-S-85 Specification Details
Materials We Manufacture In
- Carbon Steel Plain / Zinc Plated
- Stainless Steel 304 / 316
- Nylon / Plastic Lightweight, Non-Marking
- Finish Plain / Nickel / Black Oxide
How Thumb Screws Are Made
- Process Cold Formed / Machined
- Head Texture Knurled / Cast Wing
- Testing Dimensional Verified
- Quality Batch Sampled
Available Dimensions
- Nominal Size #4 – 3/8″ (Inch Series)
- Metric Equivalent Available to Drawing
- Length Custom to Application
- Head Type Knurled / Winged / Spade
Application Areas
Wherever a panel, cover, or adjustment needs to be opened and closed routinely without a tool.
Electrical & Server Enclosures
for frequent maintenance
Test & Measurement Equipment
calibration access covers
Camera & Tripod Mounts
and positioning hardware
Government & Defense Equipment
tool-free access needs
Machine Guard & Cover Panels
machine guards and covers
Laboratory Equipment
fixturing in lab settings
Audio/Visual & Rack Equipment
enclosure access hardware
General Tool-Free Access Panels
federally specified projects
Standard Export Documentation
Prepared as standard practice for every FF-S-85 thumb screw shipment.
Mill Test Certificate (MTC)
Heat number, chemical composition, and mechanical property verification for every lot.
Certificate of Conformance
Confirms the shipment matches the purchase order head type/material specification in full.
Dimensional Inspection Report
Verification of head knurl/wing geometry and thread dimensions for correct fit and grip.
Certificate of Origin (COO)
Confirms India as country of manufacture for destination customs purposes.
NABL Accredited Test Reports
Independent mechanical and dimensional testing available on request for critical applications.
Commercial Invoice & Packing List
Itemized value, Incoterm, and detailed carton/weight breakdown for customs clearance.
Internationally Recognised Standards Coverage
Related Fastener Grades & Materials
FF-S-86 Shoulder Screws
Precision pivot and bearing screws, for a different job than tool-free hand fastening.
View FF-S-86 →FF-S-92 Set Screws
Headless, point-driven fasteners for locking parts onto rotating shafts.
View FF-S-92 →FF-S-107 Cap Screws
Higher-strength headed screws for precision tensioned machine joints.
View FF-S-107 →Fasteners Manufacturer & Exporter to the USA
Our broader capability manufacturing to ASTM/ASME and US federal standards.
View USA Export Guide →Need Genuine
Tool-Free Fastening?
Tell us your access frequency, clearance, and material requirement — we’ll confirm the right head type and quote across our full thumb screw range. Akbar Fasteners Pvt. Ltd. responds within 24 hours.
Sales: +91 724 0000 733 · Support: +91 800 9315 333 · sales@akbarfasteners.in