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- November 24th 2020 -
Call: 1 (800) 377-3244
We Are Open Monday to Friday From 8 A.M.- 5 P.M., (Pacific Time)
E-mail your questions and requirements at:

Larger Beads

Ferrite Shielding Beads : Large Beads or Cylindrical Toroids

AL (nH/Square Turn or nH/N2) is the AL value.
L is inductance in nH (nanohenries)
N is the number of turns of a wire
Required turns (N) = square root of (desired 'L' /'AL'), √'L' /'AL', or 1000 turns='mH' /'AL'
O.D. is the outer diameter of the bead
I.D. is the inside diameter of the bead
HT is the height of the bead
Hole type is the number of holes in the ferrite beads. Some beads have multiple holes
CWS ByteMark Part Number is the part number to use to place purchase order. 1 inch = 25.4 mm
Color may vary by material and coating characteristics

•Specifications and Data sheets in .PDF
•Mechanical Drawing in .PDF

Low order fees are charged to total a minimum payment of $25.
Quantity marked in red is subject to availability and prior sales, or back order.
Orders are processed in 2 to 3 business days.
Please call for volume and price inquiries or email

Part Number:

EX: SB-5621-31

SB = Shielding Bead, 5621 = Size Designator, 31 = Material Type

  Part Number Permeability O.D. x I.D. x HT
( in.)
Hole Type Quantity
on hand
SB-1024-77 2000 1.000 x 0.500 x 0.825 1-hole 0 $5.00
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SB-1502-43 850 1.000 x 0.500 x 0.250 1-hole 3 $0.95
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SB-5621-31 1500 0.562 x 0.250 x 1.125 1-hole 1219 $1.20
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SB-5621-43 850 0.562 x 0.250 x 1.125 1-hole 1303 $1.20
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SB-5622-43 850 0.562 x 0.250 x 0.400 1-hole 14 $0.40
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SB-5623-43 850 0.562 x 6.350 x 13.800 1-hole 1968 $0.55
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SB-5625-43 850 0.562 x 0.286 x 1.125 1-hole 261 $0.70
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SB-6251-43 850 0.625 x 0.312 x 0.562 1-hole 33 $0.90
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SB-6252-43 850 0.625 x 0.312 x 1.125 1-hole 24 $1.10
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SB-6872-43 850 0.687 x 0.375 x 0.500 1-hole 8 $0.40
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SB-6873-43 850 0.687 x 0.375 x 1.125 1-hole 659 $0.40
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Disclaimer: CWS Bytemark reserves the right at any time and from time to time to make changes to design, technical specification, or construction of any product listed on this website without notice. CWS Bytemark also reserves the right to discontinue or limit sale of any product or service available throughout this website on temporary or permanently basis without notice. CWS Bytemark highly recommend customers not to use its products offered on this website for inappropriate use and applications. Products should be tested for its suitability by prospective customers in all possible applications and conditions.

WARNING: This product can expose you to chemicals, which is [are] known to the State of California to cause cancer and birth defects or other reproductive harm.  For more information go to

Any Comments, Suggestions or Questions? Contact us! Email:
CWS 353 West Grove Ave. Orange, California 92865
Call us Toll Free: 1-800-679-3184 or 1 (800) 377-3244
Tel: (714) 279-9010, Fax: (714) 279-9482

Copyright (C)2008, CWS Bytemark
Updated 2013 Jan. Rev. V3.1