screws shall conform to ASTM F 568M. Steel socket-headed cap screws shall
conform to ASTM A 574MASTM A 574. Steel button and flat-headed countersunk
cap screws shall conform to ASTM F 835M ASTM F 835.
2.2
HARDWARE
2.2.1
Hinges
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NOTE: Retain rolling bearing and operating cycle
description under General Requirements when hinge
Type 1 is specified.
Blast door hinges are normally full surface.
Mortise hinges can be specified for hollow metal
doors, but availability must be verified with door
manufacturers.
Hinge Type 1 is intended for cases where high usage
with smooth operation is the main requirement and is
generally appropriate for facilities designed to
resist the effects of improvised explosive devices.
Hinge Type 2 is intended for cases where
in-structure shock could damage rolling thrust
bearings and is recommended for facilities designed
to resist the effects of conventional weapons.
Hinge Type 3 is recommended for low use applications
such as infrequently used access doors.
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2.2.1.1
General Requirements
Hinges shall be specially manufactured to support the door and to resist
blast induced loading. The number of hinges shall be determined by the
blast door manufacturer. Welds used in hinges shall be continuous. Hinges
shall be attached to the door and frame using mechanical fasteners except
that full surface hinges for doors with locks shall be attached to the door
and frame by welding or approved tamper-resistant mechanical fasteners and
hinges for doors with locks shall have approved nonremovable pins. Load
ratings and fatigue life for ball and roller bearings shall be determined
in accordance with ABMA 9 and ABMA 11 as applicable and, unless otherwise
approved, the bearing steel shall conform to ASTM A 534. Hinges shall be
capable of operating for the minimum number of cycles specified without
failure or excessive wear under the door service loads where one cycle
consists of swinging the door back and forth between the normal closed
position and the 90-degree open position, where failure or excessive wear
means that the latches do not seat properly or the door does not swing
smoothly due to hinge failure or wear, and where door service loads consist
of the door weight plus any loads produced by hardware. Rolling bearings
shall be factory grease lubricated and either sealed or provided with
easily accessible lubrication fittings.
2.2.1.2
Hinge Description
[Hinge Type 1 shall be capable of smooth operation for a minimum of 250,000
cycles. This type of hinge shall be provided with structural quality steel
pins and leafs and either rolling bearings in both the thrust and radial
SECTION 08390
Page 17
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