
MICROFAST®QUICK
RESPONSE FUSIBLE
LINK PENDENT
SPRINKLER VK303 (K5.6)
TECHNICAL DATA
Page 4 of 6
Form No. F_062514 Rev 02 April 2023
The Viking Corporation, 210 N Industrial Park Drive, Hastings MI 49058
T
elephone:
269-945-9501
T
echnical
Services:
877-384-5464
Fax:
269-818-1680
Email:
[email protected]Visit the Viking website for the latest edition of this technical data page.
Approval Chart 1 (UL)
The Viking Microfast
®
Quick Response
Pendent Sprinkler VK303
Maximum 175 PSI (12 Bar) WWP
Base
Part
Number1
SIN Sprinkler
Style
Thread Size Nominal
K-Factor Overall Length FM Approvals3
(Refer also to Design Criteria.)
NPT BSPT U.S. metric2Inches mm
cULus
4
VdS LPCB
China
Approval
17536 VK303 Pendent
1/2” 15 mm 5.6 80.6 2-1/4 58
A1Z, B1Y, A3Z, B3X -- -- -- --
25296
7
VK303 Pendent
-- 15 mm 5.6 80.6 2-1/4 58
A2 -- -- -- A2
NOTICE - Product Below - Limited Availability (Contact Local Viking Office)
12275 VK303 Pendent 1/2” 15 mm 5.6 80.6 2-1/4 58
A1Z, B1Y -- -- -- --
21362
7
VK303 Pendent
-- 15 mm 5.6 80.6 2-1/4 58
B2 -- -- -- B2
Approved Temperature Ratings
A - 165 °F (74 °C), 205 °F (96 °C), and 280 °F (138
°C)
B - 165 °F (74 °C) and 205 °F (96 °C)
Approved Finishes
1 - Brass, Chrome, White Polyester5,
and Black Polyester5
2 - Brass
3 - ENT6
Approved Escutcheons
X - Standard surface-mounted escutcheon or recessed with the
Viking Micromatic®Model E-1 Recessed Escutcheon
Y - Standard surface-mounted escutcheon or recessed with the
Viking Micromatic®Model E-1 or E-2 Recessed Escutcheon
Z - Standard surface-mounted escutcheon
Footnotes
1Base part number shown. For complete part number, refer to Viking’s current price schedule.
2Metric K-factor measurement shown is when pressure is measured in Bar. When pressure is measured in kPa, divide the metric K-factor shown by 10.0.
3This table shows the listings and approvals available at the time of printing. Other approvals may be in process.
4Listed by Underwriters Laboratories Inc. for use in the U.S. and Canada.
5Other colors are available on request with the same Listings and Approvals as the standard colors.
6cULus Listed as corrosion resistant.
7Approved according to China GB Standard.
TECHNICAL DATA
Page 4 of 6
The Viking Corporation, 210 N Industrial Park Drive, Hastings MI 49058
T
elephone:
269-945-9501
T
echnical
Services:
877-384-5464
Fax:
269-818-1680
Email:
[email protected]Visit the Viking website for the latest edition of this technical data page.
DESIGN CRITERIA - UL
(Also refer to Approval Chart 1 above.)
cULus Listing Requirements:
Quick Response Fusible Element Pendent Sprinkler VK303 is cULus Listed as indicated in the Approval Chart for installation in accordance with the
latest edition of NFPA 13 for standard spray sprinklers.
• Designed for use in Light and Ordinary Hazard occupancies.
• Protection areas and maximum spacing shall be in accordance with the tables provided in NFPA 13. Maximum spacing allowed is 15 ft. (4.6 m).
• Minimum spacing allowed is 6 ft. (1.8 m) unless baffles are installed in accordance with NFPA 13.
• Minimum distance from walls is 4 in. (102 mm).
• Maximum distance from walls shall be no more than one-half of the allowable distance between sprinklers. The distance shall be measured
perpendicular to the wall.
• The sprinkler installation rules contained in NFPA 13 for standard spray pendent sprinklers must be followed.
• Venting is not required.
IMPORTANT: Always refer to Bulletin Form No. F_091699 - Care and Handling of Sprinklers. Also refer to page
F_080614 for general care, installation, and maintenance information. Viking sprinklers are to be installed in ac-
cordance with the latest edition of Viking technical data, the appropriate standards of NFPA, FM Global, LPCB,
APSAD, VdS or other similar organizations, and also with the provisions of governmental codes, ordinances, and
standards, whenever applicable.