A pharmaceutical plant in New Jersey had 14 maintenance technicians and a total labour budget of $1.8 million per year. A wrench time study — a structured observation of how technicians actually spend their shift hours — revealed that only 26% of that time was spent on hands-on maintenance work. The remaining 74% was consumed by travel to jobs, waiting for parts, locating tools, administrative tasks, and waiting for permits and access clearances. That meant $1.33 million of their annual maintenance labour was not touching a single piece of equipment. Most maintenance managers assume wrench time is somewhere around 50–60%. The industry average is actually 25–35%. If your team of 10 technicians has a 30% wrench time rate, you are effectively running a team of 3. Improving wrench time from 30% to 55% — achievable within 6 months with a CMMS-driven workflow — is the equivalent of hiring 2.5 additional technicians at zero additional cost. To see how OxMaint identifies and eliminates the time thieves in your maintenance workflow, start a free trial today — or book a demo to walk through a wrench time analysis together.
Maintenance Productivity / Labour Analytics
Wrench Time Analysis: Improve Technician Productivity Fast
The average maintenance technician spends only 25–35% of their shift on actual hands-on work. Wrench time analysis identifies where the other 65–75% goes — and gives you a targeted plan to reclaim it.
Average wrench time at facilities without CMMS-driven workflow
55%+
Achievable wrench time with optimised tools and digital workflow
2.5x
Effective capacity increase from 30% to 55% wrench time on a 10-tech team
35%
Portion of non-wrench time accounted for by travel and wait time alone
What Is Wrench Time — and Why Is It Lower Than You Think?
Wrench time (also called tool time or spanner time) measures the percentage of a technician's available shift hours spent directly performing hands-on maintenance work — turning wrenches, replacing components, executing inspections, and completing repairs. Everything else — travel, waiting, administrative tasks, searching for parts or information, permit acquisition — is non-productive time that counts against wrench time. The persistent gap between assumed and actual wrench time explains why maintenance budgets feel chronically insufficient: the capacity exists, but it isn't being converted into work.
Actual wrench time28%
Travel to and from jobs22%
Waiting (parts, permits, access)17%
Administrative tasks11%
Locating parts, tools, information22%
The 6 Biggest Wrench Time Killers — And What They Cost You
Non-wrench time is not random — it clusters around six predictable failure points in the maintenance workflow. Each one has a specific CMMS-enabled fix that compounds over time.
22%
Travel Time
Unoptimised job routing sends technicians across a site in random order. A technician covering 6 jobs in a day may travel the same route 4 times if jobs are dispatched in arrival order rather than location order.
CMMS fix: Geographic job clustering and route-optimised dispatch in OxMaint reduces daily travel time by up to 40%
17%
Waiting for Parts
A technician arrives at a job, identifies the required part, discovers it's not in stock, and has to wait — sometimes hours or days. The asset sits open, the technician is unproductive, and emergency procurement adds cost.
CMMS fix: Parts pre-staging tied to scheduled work orders. OxMaint generates pick lists before job start — parts arrive at the job, not after it begins
13%
Locating Information
Technicians searching for asset manuals, wiring diagrams, last repair history, or component specifications can spend 20–40 minutes per complex job hunting through filing systems, old PDFs, or calling colleagues.
CMMS fix: All asset documentation attached to the asset record in OxMaint — accessible via QR scan in 10 seconds on mobile
11%
Administrative Paperwork
Paper-based teams spend 30–60 minutes per shift on handwriting job cards, logging parts used, and returning paperwork to the office. Digital mobile CMMS eliminates this category almost entirely.
CMMS fix: OxMaint mobile logging during the job itself — parts, findings, photos, signatures. Zero end-of-shift admin
9%
Permit and Access Delays
Lockout/tagout, confined space entry, hot work, and area access permits require supervisor sign-off. When permits aren't pre-staged for scheduled jobs, technicians wait — sometimes for the entire permit window.
CMMS fix: Permit requirements attached to work order templates. OxMaint triggers permit requests in advance for all scheduled work in the next 24 hours
9%
Poor Job Instructions
Vague work orders with no checklist, no asset context, and no specification send technicians to jobs under-equipped. Diagnostic time replaces execution time. Simple jobs turn into 2-hour investigations.
CMMS fix: OxMaint work order templates include step-by-step checklists, required tools, safety requirements, and attached manuals — all pre-built per asset type
How to Run a Wrench Time Study at Your Facility
A wrench time study doesn't require external consultants or expensive tooling. A structured internal observation across 5–7 working days produces actionable data. Here's the methodology used by reliability engineering teams at industrial operations globally.
1
Define Activity Categories
Create 8–10 mutually exclusive activity categories: hands-on maintenance, travel, parts waiting, permit waiting, administrative, training, personal time, and unplanned interruptions. Each observation maps to exactly one category.
2
Select Observation Method
Work sampling (random instantaneous observations, minimum 384 observations per technician for 95% confidence) is more practical than continuous time study for active facilities. A trained observer records activity every 10–15 minutes across the shift.
3
Run 5-Day Observation Period
Cover all shifts, not just day shift. Night shift and weekend wrench time profiles often differ significantly from day shift due to different job types and supervision levels. Cross-shift comparison reveals different inefficiency patterns.
4
Calculate Category Percentages
Total observations per category divided by total observations gives the percentage share of shift time. Hands-on maintenance percentage is your wrench time. Cluster non-productive categories to identify where the largest single improvement opportunity lies.
5
Map to CMMS Workflow Improvements
Each major non-productive category maps to a specific CMMS capability: parts waiting maps to kitting and pre-staging; information searching maps to digital asset records; administrative time maps to mobile work order execution. OxMaint addresses all six major categories.
6
Set Target and Re-Measure at 90 Days
Set a 90-day wrench time improvement target — typically 8–12 percentage point gain is achievable in the first cycle with CMMS workflow changes. Re-run the work sampling study to validate progress and identify the next opportunity layer.
Recover Lost Technician Capacity
OxMaint targets every wrench time killer — travel, waiting, admin, parts hunting — with automated workflow that puts technicians back on the tools.
Every 5% improvement in wrench time on a 10-person maintenance team adds the equivalent of half a full-time technician in productive capacity. Start a free trial and begin tracking wrench time from week one, or book a demo to see how OxMaint's workflow analytics identify your specific productivity gaps.
Before vs. After OxMaint: Wrench Time Improvement Scenarios
Workflow Scenario
Before OxMaint
After OxMaint
Time Saved
Technician receives work order
Walk to office, collect paper — 15–20 min
Push notification to mobile — instant
15–20 min/job
Identify asset before starting
Locate in binder or call supervisor — 10–35 min
QR scan — full history in 10 seconds
10–35 min/job
Parts availability at job start
Discovered on arrival — back to storeroom — 30–120 min wait
Pre-staged pick list from PM work order — ready at job
30–120 min/job
Permit coordination
Request at job start — 20–60 min wait
Triggered 24hr before via CMMS — permit ready at job time
20–60 min/job
End-of-shift admin
45–75 min paper logging and filing
Logged in real-time during job — 0 min end-of-shift
45–75 min/shift
Job routing across multiple assets
Sequential by email arrival — no location optimisation
Location-clustered queue — minimises travel legs
30–60 min/shift
Frequently Asked Questions
What is a realistic wrench time target for an industrial maintenance team?
World-class maintenance operations target 55–65% wrench time. The 55% threshold is considered achievable within 12–18 months for a team starting at 25–35% with a systematic CMMS workflow improvement programme. Above 65%, marginal returns diminish and the risk of cutting time on necessary documentation and safety compliance increases. For most facilities, the practical sweet spot is 50–60% wrench time sustained over time.
How does OxMaint track wrench time without manual time recording?
OxMaint tracks wrench time proxies through work order timestamps — job open time, first status update, job close time — and cross-references with technician assignment data. The system identifies patterns in time-to-start (travel and waiting proxy), time on job (execution proxy), and time-to-close (admin proxy). While not a perfect substitute for work sampling, the CMMS data provides continuous monitoring that flags productivity trends without requiring weekly observation studies.
Does improving wrench time mean technicians work harder, or differently?
Wrench time improvement is almost entirely about workflow, not effort. A technician at 28% wrench time is not a low-effort worker — they are a capable person trapped in an inefficient system. Eliminating travel dead time, pre-staging parts, providing mobile access to job information, and removing end-of-shift admin changes what a technician can accomplish in a day without increasing the pace of physical work. Teams consistently report improved job satisfaction alongside wrench time gains because frustrating friction points are removed.
How do you present wrench time data to senior management to justify CMMS investment?
The most effective financial frame is labour capacity recovery: "We currently have 10 technicians operating at 28% wrench time. That is the equivalent productive capacity of 2.8 full-time technicians. OxMaint's workflow improvements target 50% wrench time within 12 months — the equivalent of adding 2.2 technicians at no additional labour cost. The annualised value of that capacity recovery at [$X fully-loaded technician cost] exceeds the annual CMMS cost by a factor of [Y]." OxMaint's ROI calculator supports this analysis with your actual numbers built in during the demo.
Recover Your Lost Technician Capacity
If Your Team's Wrench Time Is Below 35%, You're Running at Half Capacity. OxMaint Fixes the Workflow, Not the People.
OxMaint eliminates every major wrench time killer: mobile work orders remove admin time, QR asset scanning ends information hunting, pre-staged kitting stops parts waiting, advance permit triggers remove access delays, and location-optimised dispatch minimises travel. Track wrench time improvement weekly from your manager dashboard.
