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A sample part number of BBM1P021A10A breaks down as follows:
BBM1P021A10A - Designates B&B Hardware Sealtight^® Fastener Part#

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None Captive Grip Ferrous Collector Grip Length Metric Nut Special Teflon Series

Drive systems:
None Phillips Slotted Internal Hex (Socket) Internal 6 Lobe Square Pozi Drive Tamper Proof Spline

Head styles:
None Button Head Flat Head Hex Head Fillister Flat Fillister 6 Lobe (Torx) Pan Head Round Head Rivet Flat Head Rivet Socket Head Truss Head Round Head

Size & Thread styles: Standard (Metric)
None 1-64 (M 2X0.4) 2-56 (M 2.5X.045) 2-64 (M 3X0.5) 4-40 (M 3.5X0.6) 4-48 (M 4X0.7) 6-32 (M 5X0.8) 6-40 (M 6X1) 8-32 (M 8X1.5) 8-36 (M 8X1) 10-24 (M 10X1.5) 10-32 (M 10X1.25) 12-24 (M 12X1.75) 12-28 (M 12X1.5) 1/4-20 (M 14x2) 1/4-28 (M 14X1.5) 5/16-18 (M 16X2) 5/16-24 (M 16X1.5) 3/8-16 (M 18X1.5) 3/8-24 (M 20X1.5) 7/16-14 (M 20X2.5) 7/16-20 (M 22X1.5) 1/2-13 (M 22X2.5) 1/2-20 (M 24X2) 9/16-12 (M 24X3) 9/16-18 (M 25X1.5) 5/8-11 (M 27X2) 5/8-18 (M 27X3) 3/4-10 (M 30X1.5) 3/4-16 (M 30X2) 7/8-9 (M 30X3.5) 7/8-14 1-8 1-12 1 1/8-7 1 1/8-12 1 1/4-7 1 1/4-12

Oversized Thread styles: Standard (Metric)
None 1-64 (M 2X0.4) 2-56 (M 2.5X.045) 2-64 (M 3X0.5) 4-40 (M 3.5X0.6) 4-48 (M 4X0.7) 6-32 (M 5X0.8) 6-40 (M 6X1) 8-32 (M 8X1.5) 8-36 (M 8X1) 10-24 (M 10X1.5) 10-32 (M 10X1.25) 12-24 (M 12X1.75) 12-28 (M 12X1.5) 1/4-20 (M 14x2) 1/4-28 (M 14X1.5) 5/16-18 (M 16X2) 5/16-24 (M 16X1.5) 3/8-16 (M 18X1.5) 3/8-24 (M 20X1.5) 7/16-14 (M 20X2.5) 7/16-20 (M 22X1.5) 1/2-13 (M 22X2.5) 1/2-20 (M 24X2) 9/16-12 (M 24X3) 9/16-18 (M 25X1.5) 5/8-11 (M 27X2) 5/8-18 (M 27X3) 3/4-10 (M 30X1.5) 3/4-16 (M 30X2) 7/8-9 (M 30X3.5) 7/8-14 1-8 1-12

Size & Thread styles (Rivets):
None 3/32 1/8 5/32 3/16 1/4 5/16 3/8

Materials:
None Austenitic 300SS Matensitic 400 SS Molybdenum Alloy Nickel Alloy Chromium Alloy Carbon Steel Aluminum Copper

O'ring compounds:
None General Purpose Buna N Buna N Mil-P-5315 Buna N Mil-R-7362 Buna N Mil-P-25732 Ethylene Propelene Fluorosilicone Silicone AMS 3302 Silicone AMS 3304 Fluorocarbon (Viton) Butyl Kalrez Epichlorohydrin Ethylene Acrylic Neopreme Polysulfide Polyurethane Aflas Teflon Vamac FDA App. Buna N FDA App. Ethylene Prop. FDA App. Fluorosilicone FDA App. Silicone FDA App. Viton FDA App. Butyl FDA App. Neopreme

Standard Lengths:
None 1/16 (.062) 1/8 (.125) 3/16 (.187) 1/4 (.250) 5/16 (.312) 3/8 (.375) 7/16 (.438) 1/2 (.500) 9/16 (.562) 5/8 (.625) 11/16 (.687) 3/4 (.750) 13/16 (.812) 7/8 (.875) 15/16 (.937) 1 (1.000) 1-1/16 (1.062) 1-1/8 (1.125) 1-3/16 (1.187) 1-1/4 (1.250) 1-5/16 (1.312) 1-3/8 (1.375) 1-7/16 (1.438) 1-1/2 (1.500) 1-9/16 (1.562) 1-5/8 (1.625) 1-11/16 (1.687) 1-3/4 (1.750) 1-13/16 (1.812) 1-7/8 (1.875) 1-15/16 (1.937) 2 (2.000) 2-1/16 (2.062) 2-1/8 (2.125) 2-3/16 (2.187) 2-1/4 (2.250) 2-5/16 (2.312) 2-3/8 (2.375) 2-7/16 (2.438) 2-1/2 (2.500) 2-9/16 (2.562) 2-5/8 (2.625) 2-11/16 (2.687) 2-3/4 (2.750) 2-13/16 (2.812) 2-7/8 (2.875) 2-15/16 (2.937) 3 (3.000) 3-1/16 (3.062) 3-1/8 (3.125) 3-3/16 (3.187) 3-1/4 (3.250) 3-5/16 (3.312) 3-3/8 (3.375) 3-7/16 (3.438) 3-1/2 (3.500) 3-9/16 (3.562) 3-5/8 (3.625) 3-11/16 (3.687) 3-3/4 (3.750) 3-13/16 (3.812) 3-7/8 (3.875) 3-15/16 (3.937) 4 (4.000)
Metric Lengths:
None 1mm (.039) 2mm (.078) 3mm (.118) 4mm (.157) 5mm (.196) 6mm (.236) 7mm (.275) 8mm (.314) 9mm (.354) 10mm (.393) 11mm (.433) 12mm (.472) 13mm (.511) 14mm (.551) 15mm (.590) 16mm (.629) 17mm (.669) 18mm (.708) 19mm (.748) 20mm (.787) 25mm (.984) 35mm (1.377) 40mm (1.574) 45mm (1.771) 50mm (1.968) 55mm (2.165) 60mm (2.362) 65mm (2.559) 70mm (2.755) 75mm (2.952) 80mm (3.149) 85mm (3.346) 90mm (3.543) 95mm (3.740)

Options:
(Choose all that apply using Ctrl key)
None Patch Epoxy Patch 360 Pellet Strip 360 Patch Vibra-tite Patch Black Oxide Cadmium Plate Silver Plate Black Chromate Chromium Plate Dull Nickel Copper Plate Bright Nickel Rust Prevention Zinc Plate Drilled Shank Drilled Head Type A Type AB Type BP Type C Type 1 Type F Type G Type 23 Type F2