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CD 168
Hemingray D-510
Insulator Facts

Dimensions:3 1⁄2" H × 3 1⁄4" W
Primary Embossing:The Primary Embossing is typically found on the front of the insulator and usually identifies either the manufacturer (such as "Hemingray") or the company that the insulator was made for (such as "AM.TEL.&TEL.CO.")

Insulators with No Name or No Embossing are denoted as such.
HEMINGRAY
Years Produced: c.1930s-1940s
Style Identifier:Hemingray often used style numbers, letters, words, or a combination to differentiate their insulator styles (such as: T.S., E2, № 1 Provo Type, Muncie Type, etc.) These are often, but not always, embossed on the insulator.
D-510
Rarity Scale 0. No specimens known
1. Extremely Common (millions known)
2. Very Common
3. Common
4. Fairly Common
5. Uncommon
6. Very Uncommon
7. Rare (dozens known)
8. Very Rare (less than a dozen known)
9. Extremely Rare (2 or 3 known)
10. Unique (only one known)
Common (3/10)
Usage: Power (Primary Distribution)
Series:D
Voltage Rating: 6,600 Volts
Value Range: This is an estimated value range only, based on historical hobby collecting data. Insulator values vary widely depending on many factors, including embossing, color, condition, mold variations, manufacturing anomalies, and other attributes. Please visit the Hemingray Values page for more information.
$1-600
Insulator Overview

This common Lowex style produced by Hemingray is the first in the D-5X0 series. Some early specimens have a brass bushing embedded in the threads. These were intended for use as primary power distribution, with a rating of 6600 volts.
Known Embossings (27)
Primary EmbossingThe Primary Embossing is typically found on the front of the insulator and usually identifies either the manufacturer (such as "Hemingray") or the company that the insulator was made for (such as "AM.TEL.&TEL.CO.")

Insulators with No Name or No Embossing are denoted as such.
EINThe Embossing Index Number (EIN) is a unique number assigned by the collecting hobby to each distinct embossing for an insulator design. It is normally shown in brackets, e.g. [050].
EmbossingMost common terms:
(F-Skirt): Front Skirt
(R-Skirt): Rear Skirt
/: New line of embossing
{}: Special note (not embossed on the insulator)
[#]: Represents a number

Other terms:
{MLOB}: Mold Line Over Base
(F-Crown): Front Crown
(R-Crown): Rear Crown
(F-Umbrella): Front Umbrella
(R-Umbrella): Rear Umbrella
BaseThe base is the bottom of the insulator. Hemingray made 4 different types of bases:

1. SDP: Sharp Drip Points
2. RDP: Round Drip Points
3. CB: Corrugated Base
4. SB: Smooth Base
Year AddedThis is the year that this embossing was officially recognized and added to the McDougald (1991-2008) or Briel (2011-2023) insulator price guides. It is not necessarily the year this embossing was discovered.
Photo
Status = In my collection

If the value in this column says WANTED, then that specific insulator is on my wanted list! If you have that insulator and would like to sell it, click on the WANTED link to submit photos and contact me.
HEMINGRAY [005] (F-Skirt) HEMINGRAY/MADE IN U S A {Note no periods} (R-Skirt) D-510 SB - No Photo-
HEMINGRAY [010] (F-Skirt) HEMINGRAY/MADE IN U.S.A. (R-Skirt) D-510 CB - No Photo-
HEMINGRAY [020] (F-Skirt) HEMINGRAY/MADE IN U.S.A. (R-Skirt) D-510 SB - Photo
HEMINGRAY [023] (F-Skirt) HEMINGRAY/MADE IN U.S.A. (R-Skirt) REG. U.S. PAT. OFF./LOWEX/D-510 SB - No Photo-
HEMINGRAY [027] (F-Skirt) HEMINGRAY/MADE IN U.S.A. (R-Skirt) [#]/D-510 SB - No Photo-
HEMINGRAY [028] (F-Skirt) HEMINGRAY/MADE IN U.S.A. {Note 'A' in 'MADE' is missing bar} (R-Skirt) D-510 SB - Photo
HEMINGRAY [040] (F-Skirt) [# and dots]/HEMINGRAY/MADE IN U S A {Note no periods} (R-Skirt) [#]/D-510 SB - No Photo-
HEMINGRAY [042] (F-Skirt) [# and dots]/HEMINGRAY/MADE IN U S A {Note no periods} (R-Skirt) [#]/D-510 {A brass bushing molded into the pinhole with a square at the top} SB 2015 No Photo-
HEMINGRAY [050] (F-Skirt) [# and dots]/HEMINGRAY/MADE IN U.S.A. (R-Skirt) D-510 CB - Photo
HEMINGRAY [055] (F-Skirt) [# and dots]/HEMINGRAY/MADE IN U.S.A. (R-Skirt) D-510 SB - Photo
HEMINGRAY [057] (F-Skirt) [# and dots]/HEMINGRAY/MADE IN U.S.A. (R-Skirt) D-510 {A square top brass bushing molded into the pinhole} SB 2019 No Photo-
HEMINGRAY [060] (F-Skirt) [# and dots]/HEMINGRAY/MADE IN U.S.A. (R-Skirt) LOWEX/D-510 SB - No Photo-
HEMINGRAY [070] (F-Skirt) [# and dots]/HEMINGRAY/MADE IN U.S.A. (R-Skirt) LOWEX/[#]/D-510 SB - No Photo-
HEMINGRAY [080] (F-Skirt) [# and dots]/HEMINGRAY/MADE IN U.S.A. (R-Skirt) REG. IN U.S. PAT. OFF./LOWEX/D-510 SB - No Photo-
HEMINGRAY [090] (F-Skirt) [# and dots]/HEMINGRAY/MADE IN U.S.A. (R-Skirt) REG. U.S. PAT. OFF./LOWEX/D-510 SB - Photo
HEMINGRAY [091] (F-Skirt) [# and dots]/HEMINGRAY/MADE IN U.S.A. (R-Skirt) REG. U.S. PAT. OFF./LOWEX/D-510 CB 2019 No Photo-
HEMINGRAY [092] (F-Skirt) [# and dots]/HEMINGRAY/MADE IN U.S.A. (R-Skirt) REG. U.S. PAT. OFF./LOWEX/D-510 {A brass bushing molded into the pinhole with a square at the top} SB 2015 No Photo-
HEMINGRAY [095] (F-Skirt) [# and dots]/HEMINGRAY/MADE IN U.S.A. (R-Skirt) REG. U.S. PAT. OFF./LOWEX/[#]/D-510 SB - No Photo-
HEMINGRAY [100] (F-Skirt) [# and dots]/HEMINGRAY/MADE IN U.S.A. (R-Skirt) REG. U.S. PAT. OFF./LOWEX/['[#]' blotted out]/D-510 SB - No Photo-
HEMINGRAY [110] (F-Skirt) [# and dots]/HEMINGRAY/MADE IN U.S.A. (R-Skirt) [#]/D-510 SB - Photo
HEMINGRAY [111] (F-Skirt) [# and dots]/HEMINGRAY/MADE IN U.S.A. {Missing bar in 'A' of 'MADE'} (R-Skirt) [#]/D-510 SB 2019 No Photo-
HEMINGRAY [112] (F-Skirt) [# and dots]/HEMINGRAY/MADE IN U.S.A. (R-Skirt) [#]/D-510 {A brass bushing molded into the pinhole with a square at the top} SB 2015 Photo
HEMINGRAY [115] (F-Skirt) [# and dots]/HEMINGRAY/MADE IN U.S.A. (R-Skirt) ['LOWEX' blotted out]/D-510 CB - No Photo-
HEMINGRAY [120] (F-Skirt) [# and dots]/HEMINGRAY/MADE IN U.S.A. (R-Skirt) ['REG. U.S. PAT. OFF./LOWEX' blotted out]/D-510 CB - Photo
HEMINGRAY [130] (F-Skirt) [#]/HEMINGRAY/MADE IN U.S.A. (R-Skirt) D-510 SB - Photo
HEMINGRAY [135] (F-Skirt) [#]/HEMINGRAY/MADE IN U.S.A. {Note 'A' in 'MADE' is missing bar} (R-Skirt) D-510 SB - No Photo-
HEMINGRAY [140] (F-Skirt) [#]/HEMINGRAY/MADE IN U.S.A. (R-Skirt) ['LOWEX' blotted out]/D-510 SB - Photo
Removed Embossings (2)

The following embossing(s) were removed from the price guide because they could not be verified to exist, were consolidated with other embossings, or were otherwise ambiguous/inaccurate. They are preserved here for historical purposes.

Primary EmbossingThe Primary Embossing is typically found on the front of the insulator and usually identifies either the manufacturer (such as "Hemingray") or the company that the insulator was made for (such as "AM.TEL.&TEL.CO.")

Insulators with No Name or No Embossing are denoted as such.
EINThe Embossing Index Number (EIN) is a unique number assigned by the collecting hobby to each distinct embossing for an insulator design. It is normally shown in brackets, e.g. [050].
EmbossingMost common terms:
(F-Skirt): Front Skirt
(R-Skirt): Rear Skirt
/: New line of embossing
{}: Special note (not embossed on the insulator)
[#]: Represents a number

Other terms:
{MLOB}: Mold Line Over Base
(F-Crown): Front Crown
(R-Crown): Rear Crown
(F-Umbrella): Front Umbrella
(R-Umbrella): Rear Umbrella
BaseThe base is the bottom of the insulator. Hemingray made 4 different types of bases:

1. SDP: Sharp Drip Points
2. RDP: Round Drip Points
3. CB: Corrugated Base
4. SB: Smooth Base
Year Removed
HEMINGRAY [030] (F-Skirt) LOWEX / HEMINGRAY / MADE IN U.S.A. (R-Skirt) D-510 SB 2003
HEMINGRAY [150] (F-Skirt) ['LOWEX' blotted out] / HEMINGRAY / MADE IN U.S.A. (R-Skirt) D-510 CB 2003
Known Colors (19)
ColorThe color of the insulator.
Aqua
Blue Tint
Carnival
Clear
Clear/Yellow Two Tone
Dark Olive Amber
Dark Olive Amber Two Tone
Green Tint
Ice Blue
Ice Green
Light Carnival
Light Lemon
Off Clear
Opaque Blackglass
Orange Amber
Red Amber
Straw
White Milk
Yellow Tint