ASME B30.5 Reference: Crane Hand Signals, Boom Stops & Safety Shutoffs

Written by the 3P Safety training team — we qualify signal persons and evaluate them in the field nationwide. Updated August 2026.

The standard crane hand signals come from ASME B30.5, and OSHA adopted the same chart into Subpart CC as Appendix A — so when hand signals are used on a construction crane, the Standard Method is not a suggestion, it is the required baseline (1926.1422 also requires the chart to be posted or available at the site). Below is every standard signal described plainly, grouped the way crews actually think about them, followed by the qualification rules in 1926.1428 and the field discipline that keeps signals from breaking down on loud, crowded sites. One note from the evaluation side before we start: when signal person candidates fail, it is rarely the arm motions — it is the written portion, the why behind the signals and the crane knowledge underneath them. Learn both. And if you came for the other half of B30.5 — boom stops, shock-absorbing bumpers, and the derricking safety shutoff — jump to that section.

When a Signal Person Is Required at All

Under 1926.1419, a signal person is required when the point of operation is out of the operator’s full view, when the view in the direction of travel is obstructed, or when site-specific safety concerns make one necessary. The method can be hand signals, voice (radio), or audible signals — but whichever method is chosen, everyone involved has to know it, and hand signals must be the Standard Method unless a documented non-standard set has been agreed in advance for situations the standard signals cannot cover.

Hoist and Load Signals

• Hoist (raise the load): forearm vertical, index finger pointing up, hand moving in a small horizontal circle.
• Lower: arm extended downward, index finger pointing down, hand moving in a small horizontal circle.
• Use main hoist: a tap on the head with a closed fist, then the normal signals.
• Use whipline (auxiliary hoist): a tap on the elbow with one hand, then the normal signals.
• Move slowly: the still hand held above the signaling hand — hoist slowly, lower slowly, swing slowly. This modifier is the most underused signal on real sites; use it for every final placement.

Boom Signals

• Raise boom: arm extended horizontally, fist closed, thumb pointing up.
• Lower boom: arm extended horizontally, fist closed, thumb pointing down.
• Raise boom, lower load: arm extended, thumb up, fingers opening and closing while the load movement is wanted — this holds the hook height roughly constant while the radius comes in.
• Lower boom, raise load: arm extended, thumb down, fingers opening and closing — the mirror move, walking the radius out while holding the load.
• Extend boom: both fists in front of the body, thumbs pointing outward.
• Retract boom: both fists in front of the body, thumbs pointing toward each other. (One-handed versions exist in the chart for when a hand is occupied.)

Swing, Travel, and Stop

• Swing: arm extended, pointing with the index finger in the direction the boom should swing. Point where you want it to go — not at the load.
• Travel: arm extended forward, hand open and slightly raised, making a pushing motion in the direction of travel.
• Travel both tracks (crawlers): both fists rotating around each other in front of the body — direction of rotation indicates forward or backward.
• Travel one track (crawlers): one fist raised to indicate the locked track, the other fist rotating to indicate the traveling track’s direction.
• Stop: arm extended horizontally, palm down, arm swinging back and forth.
• Emergency stop: both arms extended horizontally, palms down, both swinging back and forth. Anyone on site can give a stop signal, and the operator obeys it regardless of who it came from — that rule is absolute.
• Dog everything: hands clasped in front of the body — pause all motion and hold the load while something is sorted out.

Voice and Radio: The Three-Element Rule

On blind picks, long booms, and night work, radio replaces hands — and 1926.1421 requires each voice instruction to carry three elements in order: function and direction; distance and/or speed; function stop. “Swing right fifty feet… twenty-five… ten, slow… swing stop.” Continuous communication matters: many crews run a hot mic during the entire blind portion, because to the operator, radio silence and a dropped radio sound identical. Dedicate the channel, test the equipment on site before the lift (1926.1420), and pre-agree who talks — one voice, everyone else stays off.

Signal Person Qualification — 1926.1428

OSHA does not “certify” signal persons the way it requires operator certification — it requires qualification, shown one of two ways: a third-party qualified evaluator’s documentation, or an employer’s qualified evaluator who assesses the person and documents it. Either way the person must know the standard signals, understand crane dynamics well enough to signal responsibly (boom deflection, load swing, two-blocking), and pass an oral or written test plus a practical demonstration. The documentation must be available at the site — a wallet card from a training provider satisfies the request instantly; “he knows what he’s doing” does not. NCCCO’s signalperson certification is one clean way to meet the third-party path, and it is what we recommend for anyone signaling across multiple employers’ sites.

From running these evaluations: the practical is the easy half. Candidates fail on the knowledge side — which hoist a head-tap selects, what “raise boom, lower load” does to the radius, why you never signal a swing over people. If you are preparing a crew, spend two-thirds of your prep on the why. Our crane training guide covers how signal person qualification fits into a full crane crew program.

Field Discipline That Keeps Signals Working

• One signal person per crane at a time. Where responsibility hands off (a load traveling between zones), the handoff is explicit and pre-planned — two people signaling at once is how booms meet steel. Exception: anyone can give an emergency stop, any time.
• Eye contact or radio check before the first move. The operator confirms they have the signaler before anything comes off the ground, and stops immediately any time the signaler disappears from view.
• Position for sight lines, not convenience: the signaler stands where they can see the load path and the operator can see them — and never under the load to get there.
• High-visibility identification where multiple trades are working — the operator should never have to guess which raised arm is theirs.
• If any signal is unclear, the operator stops. Not “interprets” — stops. Ambiguity resolves at zero motion.
• Language is not a barrier if the signals are: hand signals are the shared language of mixed-language crews, which is exactly why freelancing nonstandard gestures is dangerous — the chart is the dictionary everyone bought into.

ASME B30.5 Boom Stops: Shock-Absorbing Requirements and Derricking Safety Shutoffs

Hand signals are only half of what people come to B30.5 for — the other question we field constantly, in class and in exam prep, is what the standard requires to keep a boom from being pulled over backward. That answer lives in ASME B30.5 para. 5-1.9.1 (Section 5-1.9, General Requirements — Booms), and it is a short, specific list. If you landed here on a practice-exam question about shock absorbing boom stops and derricking safety shutoffs, this section is that answer.

What ASME B30.5 Para. 5-1.9.1 Requires on the Boom

• Boom stops — stops shall be provided to resist the boom falling backward over the machine (5-1.9.1(a)). B30.5 defines a boom stop as a device or structure that limits boom travel at its highest allowable position.
• Jib restraint — jibs shall be restrained from backward overturning (5-1.9.1(b)).
• Boom angle or radius indicator readable from the operator’s station (5-1.9.1(c)).
• A boom hoist disconnect, shutoff, or hydraulic relief that automatically stops the boom hoist when the boom reaches a predetermined high angle (5-1.9.1(d)) — the device practice exams usually word as the derricking safety shutoff.
• Boom length indicator on telescoping booms, unless the load rating is independent of boom length (5-1.9.1(e)).

Are Shock-Absorbing Boom Stops Required?

Boom stops themselves are mandatory — the standard says stops shall be provided. The type is where the wording softens: B30.5 says the stops should be one of three types — a fixed or telescoping bumper, a shock-absorbing bumper, or hydraulic boom elevation cylinder(s). So a shock-absorbing boom stop is one acceptable design, not the only compliant one. When an exam question asks whether B30.5 requires shock-absorbing boom stops, the precise answer is: B30.5 requires boom stops, and a shock-absorbing bumper is one of the three listed types that satisfy the requirement.

What Is a Derricking Safety Shutoff?

“Derricking” is boom hoisting — luffing the boom up and down. The derricking safety shutoff is the automatic device in 5-1.9.1(d): a boom hoist disconnect, shutoff, or hydraulic relief that cuts boom hoist power when the boom reaches a predetermined high angle, before the boom can travel into the stops. OSHA’s umbrella term is boom hoist limiting device, and its definition at 1926.1401 names the same family outright: “boom hoist disengaging device, boom hoist shut-off, boom hoist disconnect, boom hoist hydraulic relief, boom hoist kick-outs, automatic boom stop device, or derricking limiter.” Think of the shutoff as the control-side protection, with the physical boom stops as the last line behind it.

Telescopic Boom Cranes and the Hydraulic Boom Exception

Notice the third acceptable boom stop type: hydraulic boom elevation cylinder(s). On a hydraulic telescopic boom crane — an RT, an AT, a boom truck — the elevation cylinders themselves support the boom and stop it from going over backward, so the cylinders count as the boom stop. That is why you see bumpers and backstops on lattice boom crawlers but nothing that looks like a separate boom stop on a telescopic machine. OSHA makes the same call explicit for construction cranes: 1926.1415(a)(2) requires boom stops “except for derricks and hydraulic booms.” Jib stops are required when a jib is attached, again except for derricks (1926.1415(a)(3)).

How OSHA Enforces These Devices

OSHA did not leave boom overtravel protection to the standard alone — it wrote the devices directly into Subpart CC, on two enforcement tracks, and the difference matters on a real site:

• Boom stops and jib stops are safety devices (1926.1415). They must be in proper working order before operations begin, alternative measures are not permitted, and if one fails during operations the crane comes out of service until it is repaired.
• The boom hoist limiting device is a Category I operational aid (1926.1416(d)(1)). If it stops working, OSHA allows temporary alternative measures — use a boom angle indicator, or mark the boom hoist cable where the operator or a spotter can see the stop point — and the device must be repaired within 7 calendar days, with a parts-on-order extension. The boom angle or radius indicator itself is a Category II aid on a 30-day repair clock (1926.1416(e)(1)).

For how these device rules sit inside the broader construction crane standard, see our OSHA 1926 Subpart CC guide; for a side-by-side of the whole B30 family, our inspections division maintains an ASME B30 standards comparison chart.

Frequently Asked Questions

Does OSHA require ASME B30.5 hand signals specifically?

For construction cranes, OSHA requires the Standard Method hand signals in Subpart CC Appendix A — which are the B30.5 signals. Non-standard signals are allowed only for situations the standard signals cannot handle, agreed and documented before the operation.

Does a signal person need a certification card?

They need documented qualification (1926.1428), via a third-party evaluator or the employer’s qualified evaluator, with the documentation available at the site. Third-party certification like NCCCO signalperson is the cleanest evidence, especially for workers moving between employers.

Can the rigger also be the signal person?

Yes, if qualified for both roles and able to actually perform both — which on many picks they cannot, because rigging the next load and watching the current one are different places to stand. Plan the roles per lift rather than per person.

Who can give a stop signal?

Anyone who sees a problem. The designated signal person gives all operational signals, but stop and emergency stop are obeyed from anyone on site — both under the standard and under any sane site policy.

Hand signals or radio — which should we use?

Whichever gives unambiguous communication for that lift: hands for line-of-sight work and noisy close-quarters placement, radio with the three-element format for blind picks and long radii. Many crews brief both, with hand signals as the agreed fallback if radios fail mid-lift.

Does ASME B30.5 require shock-absorbing boom stops?

B30.5 requires boom stops — stops shall be provided to resist the boom falling backward (para. 5-1.9.1(a)). A shock-absorbing bumper is one of three listed types, alongside a fixed or telescoping bumper and hydraulic boom elevation cylinders, so a shock-absorbing stop is an acceptable design rather than the only compliant one.

What is a derricking safety shutoff?

It is the boom hoist limiting device required by B30.5 para. 5-1.9.1(d): a boom hoist disconnect, shutoff, or hydraulic relief that automatically stops the boom hoist when the boom reaches a predetermined high angle. OSHA’s definition at 1926.1401 covers the same device family — including boom hoist kick-outs and derricking limiters — and treats it as a Category I operational aid on construction cranes.

Need signal persons qualified, or a crane crew evaluated on site? 3P Safety delivers signal person and rigger qualification nationwide, including NCCCO exam preparation through our crane training division — request a quote or call (252) 229-5238.

Want your crew certified on standard signals? 3P Safety Crane Training delivers hands-on crane signal-person training on your jobsite.