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UNF
Compare your fastener to our visual size guide to confirm size, pitch and length.
UNF Allthread
4 UNF (Unified National Fine) allthread variants in A4-70 G316 marine-grade stainless. The imperial fine-pitch equivalent of UNC — tighter thread engagement and vibration resistance for imperial-thread equipment.
Materials and grades
A4-70 G316 marine-grade stainless across the range.
Sizes and lengths
1/4" (28 TPI), 5/16" (24 TPI), 3/8" (24 TPI), 1/2" (20 TPI). Length: 3 foot (914mm).
Thread profile
60° UNF thread angle. Pairs with UNF nuts. NOT compatible with UNC, BSW, or BSF nuts.
Standards
IFI 136C (Industrial Fastener Institute fine-thread spec).
Pairs with
Match with nuts and washers of the same thread profile and matching corrosion resistance. See the full allthread range for other thread profiles.
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1/4" x 28 TPI x 3 Foot (914mm) UNF Fine Stainless A4-70 G316 Allthread Threaded Rod IFI 136CAs low as $23.800 each -
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In stock
3/8" x 24 TPI x 3 Foot (914mm) UNF Fine Stainless A4-70 G316 Allthread Threaded Rod IFI 136CAs low as $34.000 each -
Free shipping
In stock
1/2" x 20 TPI x 3 Foot (914mm) UNF Fine Stainless A4-70 G316 Allthread Threaded Rod IFI 136CAs low as $23.800 each
4 UNF (Unified National Fine) allthread variants. 1/4" to 1/2" in A4-70 G316 marine-grade stainless. For fine-pitch imperial applications.
TECHNICAL RESOURCES
Need help identifying your allthread? See our thread size identification guide.
Key charts and specification sheets: Imperial vs Metric Strength Chart · Specs - Allthread UNF Fine Stainless G316 IFI136C
For full sizing data and standards, see our Technical PDF's Library.
