Bored Locks and Mortise Lockswith Ligature Resistant Trim

Bored Locks and Mortise Lockswith Ligature Resistant Trim

Proposed A156.34






BHMA Ballot 4 Copy


The thirdballot drew a negative vote from ASSA ABLOYasking to restore the original failure criteria in 4.4. On 7/17/2014, a web conference was held to resolve the issue. Attendees were Ken Abell, Darren Eller, Earl Delph, Jeff Trull, Robert Strong, Brian Fournier, Dave Kase, Don Baker, Bill Sporre, George Marks, Luke Woods, and Michael Tierney. Following his explanation, the committee agreed to consider a more comprehensive proposal from Darren, with drawings at the next meeting, which would be held on 7/31/2014 at 2:00 p.m..

The second web conference was actually held on October 8, 2014, attended by Brian Lindemuth, Dick Kreidel, Darren Eller, Paul Haeck, Mark Berger, Earl Delph, Matt Phillip, Jeff Trull, Bob Strong, Brian Fournier, Bill Sporre, Patricia Yulkowski, Ken Abell and Michael Tierney. Darren described the proposed failure criteria and drawings for levels A, B and C that he and Dave Kase developed. After some discussion, the committee agreed to proceed to legal review and hold a subsequent meeting. Also, Allegion said they may submit a proposal concerning the inside and outside trim. That meeting was adjourned at 11:57 a.m.

A third meeting was held on November 12, 2014, attended by Darren Eller, Paul Haeck, Don Baker, Mark Berger, Earl Delph, , Bob Strong, Patricia Yulkowski, Dave Kase and Michael Tierney. The legal review led to changes to the forward and appendix as shown in the draft. Earl’s proposed 1.3 led to a long discussion about whether both sets of trim need to meet the same level, resulting in a tentative decision that they did not, and Michael would try to clarify the intent for review at the next meeting. Patricia said she would forward materials from the NYSOMH for reference. Another meeting would be held in about three weeks. Dave raised the question of whether the tests had to be repeated the typical every four years or some other arrangement was appropriate. The meeting was adjourned at 11:57 a.m.

Fourth meeting December 18, 2014 attended by Brian Lindemuth, Dave Kase,, Earl Delph, Bob Strong, Ken Abell, Luke Woods, and Michael Tierney . Added “shaded area in 4.4” to 4.3. Accepted changes throughout in preparation for ballot. Reviewed 2010 version sent by Patricia Yulkowski indicating the method in the British Standard, but the group preferred to stay with the current method. The draft would be sent for ballot in January.

The meeting was adjourned at 11:40 a.m.


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Copyright 2015 by the

Builders Hardware Manufacturers Association, Inc.

Not to be reproduced without specific authorization from BHMA

Printed in the USA

FOREWORD (This Foreword is not a part of ANSI/BHMA A156.34)

This standard was developed to address ligature resistant trim on door hardware used in a special care environment. The standard seeksto provide residents in such an environment with reasonable personal freedom and quality of life while at the same time to diminish the risks of

self-harm and inappropriate uses by the residents and others. However, facilities differ as to environmental design, need for accessibility, tolerance of patient risk and other factors. Accordingly, the facility should assess all such factors in making a product selection..

Performance tests and, where necessary, material and dimensional requirements have been established to promote safety and product stability.

As is true of all its standards, BHMA plans to update and revise this standard on a regular basis and welcomes input from users at any time.




1.1 This Standard defines requirements and test methods for ligature resistant trim on bored locks and mortise locks. These requirements apply to the exposed parts of the lockset on the face of the door in the closed position only..

1.2Tests described in this Standard are performed under laboratory conditions. In actual usage, results vary because of installation, maintenance and environmental conditions.

1.3Level Qualifications. Manufacturers shall indicate the Level that their trim meets (i.e. Level A, B or C) for each side of the door. The product Level is established based on testing the Ligature Resistant Trim to the requirements established in Section 4. The inside and outside trim shall be evaluated and rated individually unless they are identical; it is acceptable for only one side to meet a level.


2.1 For certification to this standard, the ligature resistant product shall be subjected to and meet the Grade 1 requirements of the applicable standard, ANSI A156.2-2011 for Bored and Preassembled Locksets, or ANSI/BHMA A156.13-2012 for Mortise Locks. The manufacturer is permitted to request a waiver of all or a portion of the BHMA tests by presenting an engineering analysis demonstrating the product’s similarity to a device currently in an ongoing certification program. The analysis must clearly show the mechanical characteristics were not affected by the ligature resistant features. The Nationally Recognized Testing Laboratory responsible for the certification program must agree with the analysis.

2.2 Separate lock models that accept the same ligature resistant trim shall be evaluated individually, unless waived by engineering evaluation.

2.4 Reference to other Standards This standard and ANSI Standards referenced in this Standard are available from: American National Standards Institute, Inc., 11 West 42nd Street, New York, NY 10036 or

2.5 Dimensions All dimensions are given in US units with approximate SI (metric) conversions. Where plus or minus tolerances are not given, values are permitted to be correspondingly reduced or exceeded at the option of the manufacturer within the functional limitations of the product.

2.6 Tamper Resistance of Exposed Fasteners The lockset, including any associated mounting device, shall resist attempts to unscrew or otherwise remove, using the following tools: any normally available tools including steel dining implements, flat blade, phillips and posi-head screw drivers, over an elapsed period of fifteen minutes.


3.1 Preassembled Lock (Series 2000) A lock fitting into a notched cutout in a door.

3.2 Bored Lock (Series 4000) A lock installed in a round bored opening in the edge and face of a door.

3.3 Face (of Door) The surface of the door exposed to view when the door is closed.

3.4 Mortise Lock (Series 1000) A lock or latch fitting into a mortised cavity prepared in the edge of a door. The bolts are operated by knobs, levers, turns, thumb pieces, paddles or cylinders engaging the mortise lock or latch through holes prepared in the faces of the door.

3.5 Ligature Resistant Trim Any exposed parts of the lockset on the face of the door designed to inhibit the attachment of ligatures.

4. Testing

4.1 Ligature Test Materials - Locksets shall be tested with the following test ligatures that are commonly available. These testligatures shall be used separately or in any combination:

Level C

  • Shoelace Type A (typical wide style sneaker shoe lace)
  • Shoelace Type B (typical narrow style, dress shoe, coated lace)
  • Sneakers/shoes
  • Headphone/ear bud cord
  • Computer mouse cord
  • Bed sheet, in whole or in strips
  • Bath towel, in whole or in strips
  • Belt
  • Panty hose

Level B

  • All ligature test materials for Level C
  • Nylon String
  • 1/8” diameter solid braid nylon
  • #18 Twisted Nylon Seine Twine

Level A

  • All ligature test materials for Level B
  • 12” length of dental floss

The testing agent shall be permitted to use the following objects that may be readily available to patients as tools to assist in either creating ligature or disassembling the product for the purpose of creating ligature:

  • Pens
  • Pencils
  • Paper clips

4.2 Perform on three sets of properly mounted ligature resistant trim, one specimen for each of the three qualified evaluators.

4.3 Attach a force gauge to the end of the ligature that is pulled. Ligatures can be used in any combination and in any knot or configuration throughout the testing time. Except where noted in the material list, ligatures have no limits on material or length and can be used as the tester sees fit to attack hardware being tested. The ligatures may be pulled in any direction within the shaded area in 4.4 for the level of which the trim is being tested,and attached to any of the exposed parts of the lockset on the face of the door.The operating trim is allowed to be set in any position prior to or during attachment of the ligature. Typical attachment methods shall include either looping around or tying off to any part or device on,or attached to the product, or by being knotted, jammed, or otherwise wedged into openings, crevices, or operating clearances.The evaluation shall be performed for fifteen minutes by each evaluator once the test time has started. No interruptions will be permitted.

4.4 Requirements

Level A
(High Risk Areas) / Level B
(Medium Risk Areas) / Level C
(Low Risk Areas)
The force gauge does not exceed 11 lbf in any direction from the attachment point. / The force gauge does not exceed 11 lbf in any direction that is within the ¼ sphere from straight down from the attachment point to straight up from the attachment point and away from the latch edge of the door. / The force gauge does not exceed 11 lbf in any direction that is within the 15 degree wedge (vertical to 15 degrees away from door face) in an arc from straight down from the attachment point to 90 degrees from the attachment point away from the latch edge of the door

APPENDIX (Not Part of ANSI/BHMA A156.34)

A-1 The 11 pound pull force selected for the ligature testing was based on information found in the Wisconsin Medical Journal 2003, Volume 102, No 3.

A-2 Distribution and possession of dental floss is generally controlled in mental health facilities.

A-3 In the creation of this standard, BHMA consulted with mental health facilities, architects, and other experts to develop the criteria herein. Many publications such as The Design Guide for the Built Environment of Behavioral Health Facilities by the National Association of Psychiatric Health Systems were also studied.

A-4 It is not possible to imagine or prevent all efforts to compromise or misuse ligature attachments that may occur in a special care environment. BHMA plans to update the standard regularly as new information and developments become available.