BSF Engineering Studs — Double Ended
From £0.95 (excl. VAT)
What are BSF engineering studs?
These BSF engineering studs have a threaded section at both ends, a plain, unthreaded section in the middle and no bolt head. They are supplied from historic British-made steel stock in a self-colour, unplated finish.
BSF stands for British Standard Fine. It has a finer pitch—more threads per inch (TPI)—than Whitworth/BSW at the same nominal diameter. BSF and BSW fixings are not interchangeable. BSF is also a different thread standard from UNF, so match the thread type as well as the diameter.
Where would I use a double-ended stud?
A typical stud fastening has one end screwed into a tapped component, while the other passes through the part being secured and takes a nut. This lets the nut and removable part come off while the stud stays in place.
These studs are relevant to repairs and restoration of older engines, machinery and mechanical assemblies that already use BSF stud fixings. Match the original specification for the particular joint, including its required material and strength.
How do they differ from threaded rod or a bolt?
Fully threaded studding has thread along its length. These engineering studs have two separate threaded ends with a plain section between them. Unlike a bolt, a stud has no head to tighten against the assembly.
How do I choose the right size?
Check the BSF diameter and TPI, then measure the stud’s overall length from end to end. Where the option lists two threaded lengths, these describe the threaded sections at the two ends. The end lengths can differ, so compare both with the stud you are replacing.
The listed diameter options are 3/16, 1/4, 5/16, 3/8 and 1/2 inch BSF. Select an available size from the options above.
Which nuts and washers should I use?
Choose BSF nuts with the correct diameter, TPI and strength specification, plus appropriately sized imperial washers where required.
Unsure which imperial thread you have? Compare it using our imperial thread identification guide.
All Available Sizes & Types
| SKU | Name | Thread Size (T) | Length (L) | Material / Finish |
|---|---|---|---|---|
| SKU: BSF.ESTD.1/2X31/8(3/4.7/8).SC | Name: BSF Engineering Studs — Double Ended | Thread Size (T): 1/2" | Length (L): 3 1/8" (3/4" & 7/8" Threaded) | Material / Finish: Self Colour |
| SKU: BSF.ESTD.3/8X23/4(3/4.3/4).SC | Name: BSF Engineering Studs — Double Ended | Thread Size (T): 3/8" | Length (L): 2 3/4" (3/4" & 3/4" Threaded) | Material / Finish: Self Colour |
| SKU: BSF.ESTD.3/8X25/8(5/8.5/8).SC | Name: BSF Engineering Studs — Double Ended | Thread Size (T): 3/8" | Length (L): 2 5/8" (5/8" & 5/8" Threaded) | Material / Finish: Self Colour |
| SKU: BSF.ESTD.3/8X21/2(5/8.7/8).SC | Name: BSF Engineering Studs — Double Ended | Thread Size (T): 3/8" | Length (L): 2 1/2" (5/8" & 7/8" Threaded) | Material / Finish: Self Colour |
| SKU: BSF.ESTD.3/8X21/4(3/4.5/8).SC | Name: BSF Engineering Studs — Double Ended | Thread Size (T): 3/8" | Length (L): 2 1/4" (5/8" & 3/4" Threaded) | Material / Finish: Self Colour |
| SKU: BSF.ESTD.3/8X11/2(3/4.1/2).SC | Name: BSF Engineering Studs — Double Ended | Thread Size (T): 3/8" | Length (L): 1 1/2" (1/2" & 3/4" Threaded) | Material / Finish: Self Colour |
| SKU: BSF.ESTD.3/8X13/8(3/8.5/8).SC | Name: BSF Engineering Studs — Double Ended | Thread Size (T): 3/8" | Length (L): 1 3/8" (3/8" & 5/8" Threaded) | Material / Finish: Self Colour |
| SKU: BSF.ESTD.5/16X33/4(3/4".3/8").SC | Name: BSF Engineering Studs — Double Ended | Thread Size (T): 5/16" | Length (L): 3 3/4" (3/8" & 3/4" Threaded) | Material / Finish: Self Colour |
| SKU: BSF.ESTD.5/16X23/4(5/8.7/16).SC | Name: BSF Engineering Studs — Double Ended | Thread Size (T): 5/16" | Length (L): 2 3/4" (7/16" & 5/8" Threaded) | Material / Finish: Self Colour |
| SKU: BSF.ESTD.5/16X15/8(5/8.1/2).SC | Name: BSF Engineering Studs — Double Ended | Thread Size (T): 5/16" | Length (L): 1 5/8" (1/2" & 5/8" Threaded) | Material / Finish: Self Colour |
| SKU: BSF.ESTD.5/16X11/2(1/2.3/4).SC | Name: BSF Engineering Studs — Double Ended | Thread Size (T): 5/16" | Length (L): 1 1/2" (1/2" & 3/4" Threaded) | Material / Finish: Self Colour |
| SKU: BSF.ESTD.1/4X23/8(5/8.3/8)..SC | Name: BSF Engineering Studs — Double Ended | Thread Size (T): 1/4" | Length (L): 2 3/8" (3/8" & 5/8" Threaded) | Material / Finish: Self Colour |
| SKU: BSF.ESTD.1/4X23/8(5/8.3/8).SC | Name: BSF Engineering Studs — Double Ended | Thread Size (T): 1/4" | Length (L): 2 3/8" (3/8" & 5/8" Threaded) | Material / Finish: Self Colour |
| SKU: BSF.ESTD.3/16X5/8.SC | Name: BSF Engineering Studs — Double Ended | Thread Size (T): 3/16" | Length (L): 5/8" | Material / Finish: Self Colour |
All Available Sizes & Types
| SKU | Name | Thread Size (T) | Length (L) | Material / Finish |
|---|---|---|---|---|
| SKU: BSF.ESTD.1/2X31/8(3/4.7/8).SC | Name: BSF Engineering Studs — Double Ended | Thread Size (T): 1/2" | Length (L): 3 1/8" (3/4" & 7/8" Threaded) | Material / Finish: Self Colour |
| SKU: BSF.ESTD.3/8X23/4(3/4.3/4).SC | Name: BSF Engineering Studs — Double Ended | Thread Size (T): 3/8" | Length (L): 2 3/4" (3/4" & 3/4" Threaded) | Material / Finish: Self Colour |
| SKU: BSF.ESTD.3/8X25/8(5/8.5/8).SC | Name: BSF Engineering Studs — Double Ended | Thread Size (T): 3/8" | Length (L): 2 5/8" (5/8" & 5/8" Threaded) | Material / Finish: Self Colour |
| SKU: BSF.ESTD.3/8X21/2(5/8.7/8).SC | Name: BSF Engineering Studs — Double Ended | Thread Size (T): 3/8" | Length (L): 2 1/2" (5/8" & 7/8" Threaded) | Material / Finish: Self Colour |
| SKU: BSF.ESTD.3/8X21/4(3/4.5/8).SC | Name: BSF Engineering Studs — Double Ended | Thread Size (T): 3/8" | Length (L): 2 1/4" (5/8" & 3/4" Threaded) | Material / Finish: Self Colour |
| SKU: BSF.ESTD.3/8X11/2(3/4.1/2).SC | Name: BSF Engineering Studs — Double Ended | Thread Size (T): 3/8" | Length (L): 1 1/2" (1/2" & 3/4" Threaded) | Material / Finish: Self Colour |
| SKU: BSF.ESTD.3/8X13/8(3/8.5/8).SC | Name: BSF Engineering Studs — Double Ended | Thread Size (T): 3/8" | Length (L): 1 3/8" (3/8" & 5/8" Threaded) | Material / Finish: Self Colour |
| SKU: BSF.ESTD.5/16X33/4(3/4".3/8").SC | Name: BSF Engineering Studs — Double Ended | Thread Size (T): 5/16" | Length (L): 3 3/4" (3/8" & 3/4" Threaded) | Material / Finish: Self Colour |
| SKU: BSF.ESTD.5/16X23/4(5/8.7/16).SC | Name: BSF Engineering Studs — Double Ended | Thread Size (T): 5/16" | Length (L): 2 3/4" (7/16" & 5/8" Threaded) | Material / Finish: Self Colour |
| SKU: BSF.ESTD.5/16X15/8(5/8.1/2).SC | Name: BSF Engineering Studs — Double Ended | Thread Size (T): 5/16" | Length (L): 1 5/8" (1/2" & 5/8" Threaded) | Material / Finish: Self Colour |
| SKU: BSF.ESTD.5/16X11/2(1/2.3/4).SC | Name: BSF Engineering Studs — Double Ended | Thread Size (T): 5/16" | Length (L): 1 1/2" (1/2" & 3/4" Threaded) | Material / Finish: Self Colour |
| SKU: BSF.ESTD.1/4X23/8(5/8.3/8)..SC | Name: BSF Engineering Studs — Double Ended | Thread Size (T): 1/4" | Length (L): 2 3/8" (3/8" & 5/8" Threaded) | Material / Finish: Self Colour |
| SKU: BSF.ESTD.1/4X23/8(5/8.3/8).SC | Name: BSF Engineering Studs — Double Ended | Thread Size (T): 1/4" | Length (L): 2 3/8" (3/8" & 5/8" Threaded) | Material / Finish: Self Colour |
| SKU: BSF.ESTD.3/16X5/8.SC | Name: BSF Engineering Studs — Double Ended | Thread Size (T): 3/16" | Length (L): 5/8" | Material / Finish: Self Colour |
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