Closed-door resistance points to a fit question, not a definite diagnosis
A deadbolt that operates normally with the door open but binds when closed warrants investigation of its contact with the strike and receiving pocket. That comparison narrows the problem; it does not prove that the pocket is too shallow or that the lock must be replaced. Identify the actual deadbolt and door assembly, preserve safe exit and security, and have unresolved interference assessed before modifying the frame.
Do not force the key or thumbturn, repeatedly slam the door, or treat pushing and lifting as an acceptable permanent way to lock it. If the door cannot be opened normally from inside or cannot be secured reliably, arrange prompt qualified service and an appropriate interim plan. Do not remove the bolt, weaken the strike or block an emergency route as a workaround. This guide concerns bolt travel and receiving clearance; the broader seasonal door-fit guide addresses changing slab, hinge and weatherstrip fit.
Use observations already available without creating a trap
Record whether the difficulty affects the interior control, exterior key or both, and whether it was first noticed after installation, painting, seal replacement or other work. Describe where resistance occurs if that was apparent during ordinary use. Do not shut yourself outside or create a test that could leave someone unable to exit. When safe operation is uncertain, stop testing and give the locksmith the observations you already have.
Photograph the accessible lock face, door edge and strike, plus the door in its ordinary closed position if it can be left safely. Note visible rubbing or damage without applying an abrasive or altering a finished surface. Identify whether the spring latch also has difficulty, but do not merge the two mechanisms into one diagnosis. Open-door stiffness, incomplete travel or damaged hardware means the provider must investigate the lock or installation as well as the receiving opening.
Match the lock family, door construction and strike
Use purchase records and accessible markings to identify manufacturer, full model, single- or double-cylinder configuration and any relevant revision. Record the finish code if replacement trim or parts may be needed; color resemblance does not establish a finish match. Identify the door construction and any rating or building-use documentation. Do not dismantle a heavy door or unfamiliar lock to obtain information that a qualified provider can collect safely.
Ask which strike, reinforcement, bolt and installation instructions belong to that confirmed assembly. A similar-looking strike is not proof of compatibility. A fire-rated assembly or a shared-building entry can raise additional approval questions, and local egress requirements must be checked for the actual use. A residential installation article cannot authorize changing rated hardware, removing reinforcement or substituting a different lock configuration. Have the professional document unresolved identification rather than ordering from a photograph alone.
Read dimensions by their function, not just their number
Schlage’s B-Series instructions 47280668 Rev.03/20-a cover B60, B60CS, B60F and B62. For that identified document, the receiving hole must be at least 1¼ inches, or 32 mm, deep. Its door-preparation dimensions and supported backsets describe other parts of the installation. These are a concrete model-family example, not a universal minimum for all deadbolts or permission for the homeowner to drill a frame.
The official P515-771 template identifies a 1-inch edge-bore diameter, which is not the receiving-pocket depth. Schlage’s generic door-latching blog also uses a different pocket-depth suggestion. Do not choose a dimension because it is the easiest to reach: obtain the actual applicable model document and manufacturer clarification where guidance conflicts. Ask the locksmith to identify which measurement describes bolt travel, pocket depth, backset or bore, and which is relevant to the observed contact.
Separate the contact possibilities
Keep the observation and explanation in different columns in your service notes. A contact mark may help locate interference without establishing why it developed. The provider should assess fit and matched preparation together, then explain which evidence supports a proposed change. If a door or frame has new damage, moisture entry or broader movement, a larger opening must not be used to conceal that unresolved condition.
| Observed pattern | Question | Not proven |
|---|---|---|
| Works open, contacts closed | Where does the bolt meet the strike or pocket? | The entire lock is defective |
| Stops before complete closed-door travel | Is the identified receiving preparation suitable? | A universal depth will solve it |
| Also binds while open | Is installation or the mechanism at fault? | Only the strike needs moving |
| Needs lifting or pressure to operate | Is door fit changing the bolt alignment? | Forcing it is a safe repair |
Illustrative scenario: confusing bore size with pocket depth
Imagine a homeowner with a confirmed B60-family deadbolt that turned smoothly before the door was shut during a service demonstration. When closed, its travel stopped early. The owner finds “1 inch” on a drilling template and assumes the pocket meets the instructions. This is an illustrative scenario. The template number describes a different measurement, so the service request includes the exact instruction revision instead of concluding that the lock needs replacement.
A locksmith can inspect the actual contact, receiving preparation, strike and reinforcement while considering door fit. The homeowner does not chisel to a generic blog dimension or remove the reinforcement to make the bolt move. The resulting scope might address matched preparation or another verified defect; the scenario does not establish the repair before inspection. The important improvement is making the decision from identified documents and observed behavior.
Prepare a measurements, parts and completion checklist
Ask the provider to record the model, door construction, applicable rating, actual backset and thickness, strike and reinforcement identification, relevant receiving dimensions and point of contact. Measurements requiring dismantling, machining or uncertain access belong with the professional. Have the quote separate diagnosis, door-fit work, permitted frame preparation, matched hardware and finish restoration. Request manufacturer confirmation when replacement parts or conflicting instructions remain unresolved.
At completion, ask for demonstration of ordinary closing, full intended bolt travel, secure engagement and normal inside release under the applicable instructions, without lifting, pulling hard or forcing a control. Save the part numbers, documents used and remaining conditions. A smoother thumbturn alone does not establish security, egress compliance or a repaired door structure. Have any separate moisture, damaged frame or rated-assembly issue addressed explicitly rather than hidden by a cosmetic hardware adjustment.
Frequently asked questions
Does open-door operation prove the lock is perfect? No; it helps separate conditions but does not certify the assembly. Is every bolt pocket one depth? No; use the actual document. Can I file the strike until it works? Do not weaken or modify an unidentified security assembly. Should I remove reinforcement? No. Who should resolve conflicting dimensions? The manufacturer and qualified locksmith should establish the applicable specification. Is lifting the door an acceptable result? Not as evidence of restored ordinary operation.