BSW AND SELF TAPPING SCREWS


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  • B.S.W. Stainless Bolts

  • B.S.W. Stainless Nuts

  • Self-Tapping Screws

  • Standard Washers and Penny Washers


    BSW / UNC

    BSW is usually compatible with UNC, the only different one is 1/2", the rest are interchangeable. The only noticable difference between them is that the BSW have a slightly larger head size, (for the purist there is 5 degree difference in the pitch angle), which is not really significant.

    The threads per inch are the same (except for 1/2").
    Generally BSW and BSF was used on English cars and motorcycles until the 1960s, after that and on American cars and motorcycles UNC (coarse) tended to be used, in conjunction with UNF (fine).

    If you are uncertain of any threads you can mail them to me in a padded envelope and I will identify them for you, or just replace them with new for you.



    • B.S.W. Stainless Bolts


    HexSlot Round HeadSlot Cheese HeadSlot C'SunkSlot Raised Head
    3/16 x 1/225p20p20p20p20p
    3/16 x 5/825p25p20p25p
    3/16 x 3/425p25p25p25p
    3/16 x 130p30p30p25p25p
    3/16 x 1¼35p30p30p25p35p
    3/16 x 1½45p35p30p30p
    3/16 x 255p40p35p30p40p
    3/16 x 350p40p


    HexSlot Round HeadSlot Cheese HeadSlot C'SunkSlot Raised Head
    1/4 x 1/225p25p30p20p30p
    1/4 x 5/825p30p35p35p
    1/4 x 3/430p30p35p30p40p
    1/4 x 130p35p40p35p45p
    1/4 x 1¼35p35p45p
    1/4 x 1½40p35p50p35p60p
    1/4 x 270p40p50p40p
    1/4 x 2½75p50p70p45p75p
    1/4 x 3£1.0575p75p50p
    1/4 x 450p


    HexSlot Round HeadSlot Cheese HeadSlot C'SunkSlot Raised Head
    5/16 x 3/455p45p
    5/16 x 160p30p70p70p
    5/16 x 1¼70p50p
    5/16 x 1½80p60p40p80p
    5/16 x 295p45p£1.00
    5/16 x 2½£1.10
    5/16 x 3£1.25£1.25


    Hex
    3/8 x 180p
    3/8 x 1½95p
    3/8 x 2£1.15
    3/8 x 2½£1.25
    3/8 x 3£1.50




    B.S.W. Stainless Nuts


    B.S.W Nuts
    1/815p
    3/1615p
    1/415p
    5/1620p
    3/825p
    7/1670p
    1/280p




    Self-Tapping Screws


    Pozi PanPozi Raised C'SunkPozi FlangeSlot PanSlot Raised C'SunkSlot C'SunkPozi C'Sunk
    No.4x3/85p5p5p5p5p
    No.4 x 1/25p5p5p5p5p
    No.4 x 3/45p5p5p
    No.4 x 110p10p10p
    No.6 x 3/85p5p5p5p5p
    No.6 x 1/25p5p5p5p5p5p5p
    No.6 x 3/410p10p10p10p10p10p
    No.6 x 110p10p10p10p10p
    No.6 x 1½10p10p10p10p10p


    Pozi PanPozi Raised C'SunkPozi FlangeSlot PanSlot Raised C'SunkSlot C'SunkPozi C'SunkHex
    No.8 x 3/85p10p
    No.8 x 1/210p10p10p10p10p10p10p
    No.8 x 3/410p10p10p10p10p
    No.8 x 110p10p10p10p10p10p
    No.8 x 1¼10p10p10p
    No.8 x 1½15p10p10p10p
    No.10 x 1/210p10p10p10p10p10p10p
    No.10 3/410p10p15p10p10p10p
    No.10 x 115p10p15p10p10p10p10p
    No.10x1½15p15p10p


    Pozi PanHex
    No.12 x 3/410p15p
    No.12 x 115p
    No.12 x 1½15p
    No.14 x 3/415p15p
    No.14 x 115p15p
    No.14 x 1¼20p




    Standard Washers and Penny Washers


    FlatThickThick Small O.D.SpringSpring H.D.Screw CupShake ProofNylonCrinkle
    1/85p5p
    3/165p5p5p5p5p5p5p5p
    1/45p5p5p5p5p10p5p5p5p
    5/165p5p5p5p5p5p5p5p
    3/85p15p5p5p10p5p5p10p
    7/1610p25p10p15p
    1/210p15p10p10p15p10p15p
    9/1615p20p15p15p10p
    5/815p20p20p15p20p10p
    3/425p
    7/830p
    140p


    3/161/45/163/87/161/2
    1/25p
    9/165p
    5/810p
    11/1610p
    3/410p15p10p
    13/1610p
    7/815p
    15/1615p
    115p15p15p
    1 x 1/820p
    1 x 1/415p15p15p20p
    1 x 3/820p
    1 x 1/220p
    250p
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